ADS4245IRGCR

Sample & Buy Product Folder Support & Community Tools & Software Technical Documents ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 ADS42xx Dual-Channel, 14-/12-Bit, 160/125/65 MSPS Ultralow-Power ADC 1 Features 2 Applications • • • • 1 • • • • • • • Ultralow Power With Single 1.8-V Supply, CMOS Output: – 183 mW Total Power at 65 MSPS – 277 mW Total Power at 125 MSPS – 332 mW Total Power at 160 MSPS High Dynamic Performance: – 88-dBc SFDR at 170 MHz – 71.4-dBFS SNR at 170 MHz Crosstalk: > 90 dB at 185 MHz Programmable Gain up to 6 dB for SNR/SFDR Trade-off DC Offset Correction Output Interface Options: – 1.8-V parallel CMOS Interface – Double Data Rate (DDR) LVDS With Programmable swing: – Standard Swing: 350 mV – Low Swing: 200 mV Supports Low Input Clock Amplitude Down to 200 mVPP Package: VQFN-64 (9.00 mm × 9.00 mm) Wireless Communications Infrastructure Software-Defined Radio Power Amplifier Linearization 3 Description The ADS424x and ADS422x family of devices are low-speed variants of the ADS42xx ultralow-power family of dual-channel, 14-bit/12-bit analog-to-digital converters (ADCs). Innovative design techniques are used to achieve high-dynamic performance, while consuming extremely low power with 1.8-V supply. This topology makes the ADS424x/422x well-suited for multi-carrier, wide-bandwidth communications applications. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) ADS4222 ADS4225 ADS4226 VQFN (48) ADS4242 9.00 mm × 9.00 mm ADS4245 ADS4246 (1) For all available packages, see the orderable addendum at the end of the data sheet. ADS4222/25/26/42/45/46 Block Diagram AVDD AGND DRVDD DRGND LVDS Interface DA0P DA0M DA2P DA2M DA4P INP_A Sampling Circuit INM_A Digital and DDR Serializer 14-Bit ADC DA4M DA6P DA6M DA8P DA8M DA10P DA10M DA12P DA12M CLKP Output Clock Buffer CLOCKGEN CLKM CLKOUTP CLKOUTM DB0P DB0M DB2P DB2M DB4P INP_B Sampling Circuit INM_B Digital and DDR Serializer 14-Bit ADC DB4M DB6P DB6M DB8P DB8M DB10P DB10M DB12P DB12M CTRL1 CTRL3 SDOUT CTRL2 SCLK RESET ADS424x SEN Reference VCM SDATA Control Interface 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com Table of Contents 1 2 3 4 5 6 7 8 Features .................................................................. 1 Applications ........................................................... 1 Description ............................................................. 1 Revision History..................................................... 2 Description (continued)......................................... 3 ADS424x/422x Family Comparison...................... 4 Pin Configuration and Functions ......................... 5 Specifications....................................................... 10 8.1 8.2 8.3 8.4 8.5 Absolute Maximum Ratings .................................... ESD Ratings............................................................ Recommended Operating Conditions..................... Thermal Information ................................................ Electrical Characteristics: ADS4246, ADS4245, ADS4242.................................................................. 8.6 Electrical Characteristics: ADS4226, ADS4225, ADS4222.................................................................. 8.7 Electrical Characteristics: General .......................... 8.8 Digital Characteristics ............................................. 8.9 Timing Requirements: LVDS and CMOS Modes.... 8.10 Serial Interface Timing Characteristics ................. 8.11 Reset Timing (Only When Serial Interface Is Used)........................................................................ 8.12 Typical Characteristics .......................................... 9 10 10 11 11 9.2 9.3 9.4 9.5 9.6 Functional Block Diagrams ..................................... Feature Description................................................. Device Functional Modes........................................ Programming........................................................... Register Maps ......................................................... 49 51 57 58 67 10 Application and Implementation........................ 79 10.1 Application Information.......................................... 79 10.2 Typical Application ............................................... 80 11 Power Supply Recommendations ..................... 83 11.1 Sharing DRVDD and AVDD Supplies ................... 83 11.2 Using DC/DC Power Supplies .............................. 83 11.3 Power Supply Bypassing ...................................... 83 12 Layout................................................................... 83 12 12.1 Layout Guidelines ................................................. 83 12.2 Layout Example .................................................... 84 15 18 19 19 20 13 Device and Documentation Support ................. 85 20 25 Detailed Description ............................................ 49 9.1 Overview ................................................................. 49 13.1 13.2 13.3 13.4 13.5 13.6 13.7 Device Support .................................................... Documentation Support ....................................... Related Links ........................................................ Community Resources.......................................... Trademarks ........................................................... Electrostatic Discharge Caution ............................ Glossary ................................................................ 85 86 87 87 87 87 87 14 Mechanical, Packaging, and Orderable Information ........................................................... 87 4 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision C (March 2011) to Revision D • Page Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section. ................................................................................................ 1 Changes from Revision B (May 2011) to Revision C Page • Changed device status from Mixed Status to Production Data.............................................................................................. 1 • Changed 125MSPS sub-bullet of first Features bullet ........................................................................................................... 1 • Changed sub-bullets of second Features bullet ..................................................................................................................... 1 • Changed description of pin 64 in Pin Descriptions: LVDS Mode table .................................................................................. 7 • Changed description of pin 64 in Pin Descriptions: CMOS Mode table............................................................................... 10 • Changed ADS4246 fIN = 170 MHz Worst spur typical spcification in the ADS4246/ADS4245/ADS4242 Electrical Characteristics table ............................................................................................................................................................. 14 • Added ADS4225/ADS4222 fIN = 70 MHz SNR, SINAD, SFDR, THD, HD2, HD3, and Worst spur minimum and typical spcifications in the ADS4226/ADS4225/ADS4222 Electrical Characteristics table .................................................. 15 • Added ADS4225/ADS4222 DNL minimum and maximum spcifications in the ADS4226/ADS4225/ADS4222 Electrical Characteristics table ............................................................................................................................................. 17 • Added ADS4225/ADS4222 INL maximum spcifications in the ADS4226/ADS4225/ADS4222 Electrical Characteristics table ............................................................................................................................................................. 17 • Changed ADS4242/ADS4222 Power Supply, Digital power LVDS interface typical specification in Electrical Characteristics: General table .............................................................................................................................................. 18 2 Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 • Changed ADS4245/ADS4225 Power Supply, Digital power CMOS interface typical specification in Electrical Characteristics: General table .............................................................................................................................................. 18 • Moved High-Performance Modes into separate table .......................................................................................................... 21 • Changed description of READOUT disabled in Serial Register Readout section................................................................ 60 • Updated Figure 152.............................................................................................................................................................. 61 • Changed READOUT desciption in Register Address 00h section ....................................................................................... 68 • Changed CLKOUT FALL POSN and CLKOUT RISE POSN description in Register Address 42h section ........................ 73 Changes from Revision A (May 2011) to Revision B Page • Changed sub-bullets of first Features bullet........................................................................................................................... 1 • Updated description of NC pin in LVDS Pin Descriptions table ............................................................................................. 7 • Updated description of NC pin in CMOS Pin Descriptions table.......................................................................................... 10 • Changed ENOB, DNL, and INL test conditions in the Electrical Characteristics: ADS4246/ADS4245/ADS4242 table ..... 14 • Deleted INL minimum specifications from Electrical Characteristics: ADS4246/ADS4245/ADS4242 table ........................ 14 • Changed INL maximum specifications in the Electrical Characteristics: ADS4246/ADS4245/ADS4242 table.................... 14 • Changed ENOB, DNL, and INL test conditions in the Electrical Characteristics: ADS4226/ADS4225/ADS4222 table ..... 17 • Changed ADS4226 INL maximum specification in the Electrical Characteristics: ADS4226/ADS4225/ADS4222 table ..... 17 • Changed Power Supply, IDRVDD and Digital power CMOS interface rows in the Electrical Characteristics: General table ...................................................................................................................................................................................... 18 • Updated Figure 16................................................................................................................................................................ 25 • Updated Figure 18................................................................................................................................................................ 26 • Updated Figure 37 and Figure 38 ........................................................................................................................................ 29 • Updated Figure 39 and Figure 40 ........................................................................................................................................ 29 • Updated Figure 58 and Figure 59 ........................................................................................................................................ 33 • Updated Figure 60 and Figure 61 ........................................................................................................................................ 34 • Updated Figure 79 and Figure 80 ........................................................................................................................................ 37 • Updated Figure 81 and Figure 82 ........................................................................................................................................ 37 • Updated Figure 96................................................................................................................................................................ 40 • Updated Figure 97 and SBAS533graph8650 ....................................................................................................................... 40 • Updated Figure 115.............................................................................................................................................................. 43 • Updated Figure 127.............................................................................................................................................................. 46 • Changed title of Figure 128 .................................................................................................................................................. 46 • Updated ADS424x/422x Family Pins section in Table 4 ...................................................................................................... 51 • Changed 111110 and 001111 LVDS SWING description in Register Address 01h ............................................................ 68 5 Description (continued) The ADS424x/422x have gain options that can be used to improve SFDR performance at lower full-scale input ranges. These devices include a dc offset correction loop that can be used to cancel the ADC offset. Both DDR (double data rate) LVDS and parallel CMOS digital output interfaces are available in a compact VQFN-64 package. The devices include internal references while the traditional reference pins and associated decoupling capacitors have been eliminated. All devices are specified over the industrial temperature range (–40°C to 85°C). Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 3 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com 6 ADS424x/422x Family Comparison (1) 4 DEVICE FAMILY (1) 250 MSPS 160 MSPS 125 MSPS 65 MSPS ADS424x 14-bit family ADS4249 ADS4246 ADS4245 ADS4242 ADS422x 12-bit family ADS4229 ADS4226 ADS4225 ADS4222 See Table 4 for details on migrating from the ADS62P49 family. Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 7 Pin Configuration and Functions 49 DRGND 50 DA8M 51 DA8P 52 DA10M 53 DA10P 54 DA12M 55 DA12P 56 CLKOUTM 57 CLKOUTP 58 NC 59 NC 60 DB0M 61 DB0P 62 DB2M 63 DB2P 64 SDOUT ADS4246, ADS4245, and ADS4242 RGC Package 64-Pin VQFN With Exposed Thermal Pad LVDS Mode - Top View DRVDD 1 48 DRVDD DB4M 2 47 DA6P DB4P 3 46 DA6M DB6M 4 45 DA4P DB6P 5 42 DA4M DB8M 6 43 DA2P 42 DA2M DB8P 7 DB10M 8 DB10P 9 41 DA0P Thermal Pad (Connected to DRGND) 40 DA0M DB12M 10 39 NC DB12P 11 38 NC RESET 12 37 CTRL3 SCLK 13 36 CTRL2 SDATA 14 35 CTRL1 AGND 32 AGND 31 INM_A 30 INP_A 29 AGND 28 AGND 27 CLKM 26 CLKP 25 VCM 23 AGND 24 AVDD 22 AGND 21 INP_B 19 Copyright © 2011–2015, Texas Instruments Incorporated INM_B 20 33 AVDD AGND 17 34 AVDD AVDD 16 AGND 18 SEN 15 Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 5 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com 49 DRGND 50 DA6M 51 DA6P 52 DA8M 53 DA8P 54 DA10M 55 DA10P 56 CLKOUTM 57 CLKOUTP 58 NC 59 NC 60 NC 61 NC 62 DB0M 63 DB0P 64 SDOUT ADS4226, ADS4225, and ADS4222 RGC Package 64-Pin VQFN With Exposed Thermal Pad LVDS Mode - Top View DRVDD 1 48 DRVDD DB2M 2 47 DA4P DB2P 3 46 DA4M DB4M 4 45 DA2P DB4P 5 42 DA2M DB6M 6 43 DA0P 42 DA0M DB6P 7 DB8M 8 DB8P 9 41 NC Thermal Pad (Connected to DRGND) 40 NC DB10M 10 39 NC DB10P 11 38 NC RESET 12 37 CTRL3 SCLK 13 36 CTRL2 SDATA 14 35 CTRL1 AGND 32 AGND 31 INM_A 30 INP_A 29 AGND 28 AGND 27 CLKM 26 CLKP 25 VCM 23 AGND 24 AVDD 22 AGND 21 INP_B 19 INM_B 20 33 AVDD AGND 17 34 AVDD AVDD 16 AGND 18 SEN 15 Pin Functions – LVDS Mode PIN I/O DESCRIPTION NAME NO. AGND 17, 18, 21, 24, 27, 28, 31, 32 Input Analog ground AVDD 16, 22, 33, 34 Input Analog power supply CLKM 26 Input Differential clock negative input CLKOUTM 56 Output Differential output clock, complement CLKOUTP 57 Output Differential output clock, true CLKP 25 Input Differential clock positive input CTRL1 35 Input Digital control input pins. Together, they control the various power-down modes. CTRL2 36 Input Digital control input pins. Together, they control the various power-down modes. CTRL3 37 Input Digital control input pins. Together, they control the various power-down modes. DA0P, DA0M Refer to pinout drawings Output Channel A differential output data pair, D0 and D1 multiplexed DA2P, DA2M Refer to pinout drawings Output Channel A differential output data D2 and D3 multiplexed DA4P, DA4M Refer to pinout drawings Output Channel A differential output data D4 and D5 multiplexed DA6P, DA6M Refer to pinout drawings Output Channel A differential output data D6 and D7 multiplexed DA8P, DA8M Refer to pinout drawings Output Channel A differential output data D8 and D9 multiplexed DA10P, DA10M Refer to pinout drawings Output Channel A differential output data D10 and D11 multiplexed 6 Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 Pin Functions – LVDS Mode (continued) PIN I/O DESCRIPTION NAME NO. DA12P, DA12M Refer to pinout drawings Output Channel A differential output data D12 and D13 multiplexed (ADS424x only) DB0P, DB0M Refer to pinout drawings Output Channel B differential output data pair, D0 and D1 multiplexed DB2P, DB2M Refer to pinout drawings Output Channel B differential output data D2 and D3 multiplexed DB4P, DB4M Refer to pinout drawings Output Channel B differential output data D4 and D5 multiplexed DB6P, DB6M Refer to pinout drawings Output Channel B differential output data D6 and D7 multiplexed DB8P, DB8M Refer to pinout drawings Output Channel B differential output data D8 and D9 multiplexed DB10P, DB10M Refer to pinout drawings Output Channel B differential output data D10 and D11 multiplexed DB12P, DB12M Refer to pinout drawings Output Channel B differential output data D12 and D13 multiplexed (ADS424x only) DRGND 49, PAD Input Output buffer ground DRVDD 1, 48 Input Output buffer supply INM_A 30 Input Differential analog negative input, channel A INM_B 20 Input Differential analog negative input, channel B INP_A 29 Input Differential analog positive input, channel A INP_B 19 Input Differential analog positive input, channel B NC Refer to Figure 28, Figure 29, and Figure 45 — Do not connect, must be floated RESET 12 Input Serial interface RESET input. When using the serial interface mode, the internal registers must be initialized through a hardware RESET by applying a high pulse on this pin or by using the software reset option; refer to the Serial Interface Configuration section. In parallel interface mode, the RESET pin must be permanently tied high. SCLK and SEN are used as parallel control pins in this mode. This pin has an internal 150-kΩ pulldown resistor. SCLK 13 Input This pin functions as a serial interface clock input when RESET is low. It controls the lowspeed mode selection when RESET is tied high; see Table 9 for detailed information. This pin has an internal 150-kΩ pulldown resistor. SDATA 14 Input Serial interface data input; this pin has an internal 150-kΩ pulldown resistor. SDOUT 64 Output SEN 15 Input VCM 23 Output Copyright © 2011–2015, Texas Instruments Incorporated This pin functions as a serial interface register readout when the READOUT bit is enabled. When READOUT = 0, this pin is in high-impedance state. This pin functions as a serial interface enable input when RESET is low. It controls the output interface and data format selection when RESET is tied high; see Table 10 for detailed information. This pin has an internal 150-kΩ pullup resistor to AVDD. This pin outputs the common-mode voltage (0.95 V) that can be used externally to bias the analog input pins Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 7 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com 49 DRGND 50 DA8 51 DA9 52 DA10 53 DA11 54 DA12 55 DA13 56 UNUSED 57 CLKOUT 58 NC 59 NC 60 DB0 61 DB1 62 DB2 DRVDD 1 48 DRVDD DB4 2 47 DA7 DB5 3 46 DA6 DB6 4 45 DA5 DB7 5 42 DA4 DB8 6 43 DA3 DB9 7 42 DA2 DB10 8 DB11 9 41 DA1 Thermal Pad (Connected to DRGND) 40 DA0 DB12 10 39 NC DB13 11 38 NC RESET 12 37 CTRL3 SCLK 13 36 CTRL2 SDATA 14 35 CTRL1 Submit Documentation Feedback AGND 32 AGND 31 INM_A 30 INP_A 29 AGND 28 AGND 27 CLKM 26 CLKP 25 VCM 23 AGND 24 AVDD 22 AGND 21 33 AVDD INP_B 19 AVDD 16 INM_B 20 34 AVDD AGND 18 SEN 15 AGND 17 8 63 DB3 64 SDOUT ADS4246, ADS4245, and ADS4242 RGC Package 64-Pin VQFN With Exposed Thermal Pad CMOS Mode - Top View Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 49 DRGND 50 DA6 51 DA7 52 DA8 53 DA9 54 DA10 55 DA11 56 UNUSED 57 CLKOUT 58 NC 59 NC 60 NC 61 NC 62 DB0 63 DB1 64 SDOUT ADS4226, ADS4225, and ADS4222 RGC Package 64-Pin VQFN With Exposed Thermal Pad CMOS Mode - Top View DRVDD 1 48 DRVDD DB2 2 47 DA5 DB3 3 46 DA4 DB4 4 45 DA3 DB5 5 42 DA2 DB6 6 43 DA1 DB7 7 42 DA0 DB8 8 DB9 9 41 NC Thermal Pad (Connected to DRGND) 40 NC DB10 10 39 NC DB11 11 38 NC RESET 12 37 CTRL3 SCLK 13 36 CTRL2 SDATA 14 35 CTRL1 AGND 32 AGND 31 INM_A 30 INP_A 29 AGND 28 AGND 27 CLKM 26 CLKP 25 VCM 23 AGND 24 AVDD 22 AGND 21 INP_B 19 33 AVDD INM_B 20 AVDD 16 AGND 17 34 AVDD AGND 18 SEN 15 Pin Functions – CMOS Mode PIN I/O DESCRIPTION NAME NO. AGND 17, 18, 21, 24, 27, 28, 31, 32 Input Analog ground AVDD 16, 22, 33, 34 Input Analog power supply CLKM 26 Input Differential clock negative input CLKOUT 57 Output CLKP 25 Input Differential clock positive input CTRL1 35 Input Digital control input pins. Together, they control various power-down modes. CTRL2 36 Input Digital control input pins. Together, they control various power-down modes. CTRL3 37 Input Digital control input pins. Together, they control various power-down modes. DA0 to DA11 Refer to pinout drawings Output Channel A ADC output data bits, CMOS levels DA12 to DA13 Refer to pinout drawings Output Channel A ADC output data bits, CMOS levels (ADS424x only) DB0 to DB11 Refer to pinout drawings Output Channel B ADC output data bits, CMOS levels DB12 to DB13 Refer to pinout drawings Output Channel B ADC output data bits, CMOS levels (ADS424x only) DRGND 49, PAD Input Output buffer ground DRVDD 1, 48 Input Output buffer supply INM_A 30 Input Differential analog negative input, channel A INM_B 20 Input Differential analog negative input, channel B INP_A 29 Input Differential analog positive input, channel A Copyright © 2011–2015, Texas Instruments Incorporated CMOS output clock Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 9 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com Pin Functions – CMOS Mode (continued) PIN I/O NAME NO. INP_B 19 Input NC — — DESCRIPTION Differential analog positive input, channel B Do not connect, must be floated RESET 12 Input Serial interface RESET input. When using the serial interface mode, the internal registers must be initialized through a hardware RESET by applying a high pulse on this pin or by using the software reset option; refer to the Serial Interface Configuration section. In parallel interface mode, the RESET pin must be permanently tied high. SDATA and SEN are used as parallel control pins in this mode. This pin has an internal 150-kΩ pulldown resistor. SCLK 13 Input This pin functions as a serial interface clock input when RESET is low. It controls the lowspeed mode when RESET is tied high; see Table 9 for detailed information. This pin has an internal 150-kΩ pulldown resistor. SDATA 14 Input Serial interface data input; this pin has an internal 150-kΩ pulldown resistor. SDOUT 64 Output SEN 15 Input UNUSED 56 — VCM 23 Output This pin functions as a serial interface register readout when the READOUT bit is enabled. When READOUT = 0, this pin is in high-impedance state. This pin functions as a serial interface enable input when RESET is low. It controls the output interface and data format selection when RESET is tied high; see Table 10 for detailed information. This pin has an internal 150-kΩ pullup resistor to AVDD. This pin is not used in the CMOS interface This pin outputs the common-mode voltage (0.95 V) that can be used externally to bias the analog input pins 8 Specifications 8.1 Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted) (1) MIN MAX UNIT Supply voltage range, AVDD –0.3 2.1 V Supply voltage range, DRVDD –0.3 2.1 V Voltage between AGND and DRGND –0.3 0.3 V Voltage between AVDD to DRVDD (when AVDD leads DRVDD) –2.4 2.4 V Voltage between DRVDD to AVDD (when DRVDD leads AVDD) –2.4 2.4 V INP_A, INM_A, INP_B, INM_B –0.3 Minimum (1.9, AVDD + 0.3) V CLKP, CLKM (2) –0.3 AVDD + 0.3 V RESET, SCLK, SDATA, SEN, CTRL1, CTRL2, CTRL3 –0.3 3.9 V Voltage applied to input pins Operating free-air temperature range, TA –40 Operating junction temperature range, TJ Storage temperature range, Tstg (1) (2) –65 85 °C 125 °C 150 °C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. When AVDD is turned off, it is recommended to switch off the input clock (or ensure the voltage on CLKP, CLKM is less than |0.3 V|). This configuration prevents the ESD protection diodes at the clock input pins from turning on. 8.2 ESD Ratings VALUE V(ESD) (1) (2) 10 Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1) ±2000 Charged-device model (CDM), per JEDEC specification JESD22C101 (2) ±500 UNIT V JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process. JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process. Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 8.3 Recommended Operating Conditions Over operating free-air temperature range, unless otherwise noted. MIN NOM MAX UNIT Analog supply voltage, AVDD 1.7 1.8 1.9 V Digital supply voltage, DRVDD 1.7 1.8 1.9 V SUPPLIES ANALOG INPUTS Differential input voltage range 2 Input common-mode voltage VPP VCM ± 0.05 V Maximum analog input frequency with 2 VPP input amplitude (1) 400 MHz Maximum analog input frequency with 1 VPP input amplitude (1) 600 MHz CLOCK INPUT Input clock sample rate (ADS4242/ADS4222) Input clock sample rate (ADS4245/ADS4225) Input clock sample rate (ADS4246/ADS4226) Input clock amplitude differential (VCLKP – VCLKM) Low-speed mode enabled (by default after reset) Low-speed mode enabled 1 (2) Low-speed mode disabled (2) (by default after reset) Low-speed mode enabled (2) 65 MSPS 1 80 MSPS 80 125 1 80 MSPS Low-speed mode disabled (2) (by default after reset) 80 160 MSPS Sine wave, ac-coupled 0.2 1.5 VPP LVPECL, ac-coupled 1.6 VPP LVDS, ac-coupled 0.7 VPP LVCMOS, single-ended, ac-coupled 1.5 V INPUT CLOCK DUTY CYCLE Low-speed mode disabled 35% 50% 65% Low-speed mode enabled 40% 50% 60% DIGITAL OUTPUTS Maximum external load capacitance from each output pin to DRGND, CLOAD Differential load resistance between the LVDS output pairs (LVDS mode), RLOAD Operating free-air temperature, TA (1) (2) 5 pF 100 Ω –40 85 °C See the Application InformationA section in the Application Information. See the Serial Interface Configuration section for details on programming the low-speed mode. 8.4 Thermal Information ADS42xx THERMAL METRIC (1) RGC (VQFN) UNIT 64 PINS RθJA Junction-to-ambient thermal resistance 23.9 °C/W RθJC(top) Junction-to-case (top) thermal resistance 10.9 °C/W RθJB Junction-to-board thermal resistance 4.3 °C/W ψJT Junction-to-top characterization parameter 0.1 °C/W ψJB Junction-to-board characterization parameter 4.4 °C/W RθJC(bot) Junction-to-case (bottom) thermal resistance 0.6 °C/W (1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report (SPRA953). Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 11 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com 8.5 Electrical Characteristics: ADS4246, ADS4245, ADS4242 Typical values are at 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, 50% clock duty cycle, –1 dBFS differential analog input, LVDS interface, and 0-dB gain, unless otherwise noted. Minimum and maximum values are across the full temperature range: TMIN = –40°C to TMAX = 85°C, AVDD = 1.8 V, and DRVDD = 1.8 V. PARAMETER TEST CONDITIONS MIN TYP Resolution 14 fIN = 20 MHz ADS4246 (160 MSPS) 72.8 ADS4245 (125 MSPS) 73.4 ADS4242 (65 MSPS) 73.6 ADS4246 (160 MSPS) fIN = 70 MHz ADS4245 (125 MSPS) ADS4242 (65 MSPS) Signal-to-noise ratio SNR fIN = 100 MHz fIN = 300 MHz fIN = 20 MHz 72.9 69.5 72.5 72.2 ADS4245 (125 MSPS) 72.6 ADS4242 (65 MSPS) 72.3 69 71.4 ADS4242 (65 MSPS) 70.4 ADS4246 (160 MSPS) 69.4 ADS4245 (125 MSPS) 69.3 ADS4242 (65 MSPS) 69.4 ADS4246 (160 MSPS) 72.6 ADS4245 (125 MSPS) 73.2 ADS4242 (65 MSPS) 73.5 ADS4245 (125 MSPS) ADS4242 (65 MSPS) SINAD fIN = 100 MHz fIN = 300 MHz fIN = 20 MHz 72.6 68.5 72.3 71.7 ADS4245 (125 MSPS) 72.3 ADS4242 (65 MSPS) 72.1 67.5 Spurious-free dynamic range SFDR fIN = 100 MHz 71.2 ADS4242 (65 MSPS) 70.2 ADS4246 (160 MSPS) 68 ADS4245 (125 MSPS) 68.5 ADS4242 (65 MSPS) 68.2 ADS4246 (160 MSPS) 86 ADS4245 (125 MSPS) 88 ADS4242 (65 MSPS) 91 fIN = 300 MHz 12 Submit Documentation Feedback dBFS dBFS dBFS dBFS dBFS dBFS dBFS dBFS dBc 84 ADS4245 (125 MSPS) 73.5 86 ADS4242 (65 MSPS) 73.5 88 ADS4246 (160 MSPS) 82 ADS4245 (125 MSPS) 85 ADS4242 (65 MSPS) 87 ADS4246 (160 MSPS) fIN = 170 MHz dBFS 70.8 ADS4245 (125 MSPS) ADS4246 (160 MSPS) fIN = 70 MHz dBFS 72.1 69 ADS4246 (160 MSPS) ADS4246 (160 MSPS) fIN = 170 MHz Bits 71.2 ADS4245 (125 MSPS) ADS4246 (160 MSPS) fIN = 70 MHz UNIT 72.5 70 ADS4246 (160 MSPS) ADS4246 (160 MSPS) fIN = 170 MHz Signal-to-noise and distortion ratio MAX 72 dBc dBc 82 ADS4245 (125 MSPS) 88 ADS4242 (65 MSPS) 85 ADS4246 (160 MSPS) 78 ADS4245 (125 MSPS) 78 ADS4242 (65 MSPS) 74 dBc dBc Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 Electrical Characteristics: ADS4246, ADS4245, ADS4242 (continued) Typical values are at 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, 50% clock duty cycle, –1 dBFS differential analog input, LVDS interface, and 0-dB gain, unless otherwise noted. Minimum and maximum values are across the full temperature range: TMIN = –40°C to TMAX = 85°C, AVDD = 1.8 V, and DRVDD = 1.8 V. PARAMETER TEST CONDITIONS fIN = 20 MHz MIN 84 ADS4245 (125 MSPS) 86 ADS4242 (65 MSPS) 88 ADS4246 (160 MSPS) fIN = 70 MHz Total harmonic distortion THD fIN = 100 MHz fIN = 300 MHz fIN = 20 MHz 72 84 ADS4242 (65 MSPS) 72 85 ADS4246 (160 MSPS) 81 ADS4245 (125 MSPS) 83 ADS4242 (65 MSPS) 85 70 Second-harmonic distortion HD2 fIN = 100 MHz 84 ADS4242 (65 MSPS) 82 ADS4246 (160 MSPS) 76 ADS4245 (125 MSPS) 75 ADS4242 (65 MSPS) 73 ADS4246 (160 MSPS) 86 ADS4245 (125 MSPS) 88 ADS4242 (65 MSPS) 91 fIN = 300 MHz fIN = 20 MHz 73.5 86 ADS4242 (65 MSPS) 73.5 88 ADS4246 (160 MSPS) 82 ADS4245 (125 MSPS) 85 ADS4242 (65 MSPS) 87 72 Third-harmonic distortion HD3 fIN = 100 MHz 88 ADS4242 (65 MSPS) 85 ADS4246 (160 MSPS) 78 ADS4245 (125 MSPS) 78 ADS4242 (65 MSPS) 74 ADS4246 (160 MSPS) 92 ADS4245 (125 MSPS) 93 ADS4242 (65 MSPS) 95 fIN = 300 MHz Copyright © 2011–2015, Texas Instruments Incorporated dBc dBc dBc dBc dBc dBc dBc dBc dBc 86 ADS4245 (125 MSPS) 73.5 89 ADS4242 (65 MSPS) 73.5 90 ADS4246 (160 MSPS) 93 ADS4245 (125 MSPS) 89 ADS4242 (65 MSPS) 96 ADS4246 (160 MSPS) fIN = 170 MHz dBc 82 ADS4245 (125 MSPS) ADS4246 (160 MSPS) fIN = 70 MHz dBc 84 ADS4245 (125 MSPS) ADS4246 (160 MSPS) fIN = 170 MHz UNIT 80 ADS4245 (125 MSPS) ADS4246 (160 MSPS) fIN = 70 MHz MAX 81 ADS4245 (125 MSPS) ADS4246 (160 MSPS) fIN = 170 MHz TYP ADS4246 (160 MSPS) 72 dBc 94 ADS4245 (125 MSPS) 90 ADS4242 (65 MSPS) 87 ADS4246 (160 MSPS) 80 ADS4245 (125 MSPS) 81 ADS4242 (65 MSPS) 81 Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 dBc dBc dBc 13 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com Electrical Characteristics: ADS4246, ADS4245, ADS4242 (continued) Typical values are at 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, 50% clock duty cycle, –1 dBFS differential analog input, LVDS interface, and 0-dB gain, unless otherwise noted. Minimum and maximum values are across the full temperature range: TMIN = –40°C to TMAX = 85°C, AVDD = 1.8 V, and DRVDD = 1.8 V. PARAMETER TEST CONDITIONS fIN = 20 MHz MIN 90 ADS4245 (125 MSPS) 95 ADS4242 (65 MSPS) 98 ADS4246 (160 MSPS) fIN = 70 MHz Worst spur (other than second and third harmonics) fIN = 100 MHz fIN = 300 MHz f1 = 46 MHz, f2 = 50 MHz, each tone at –7 dBFS Two-tone intermodulation distortion MAX UNIT dBc 92 ADS4245 (125 MSPS) 78 94 ADS4242 (65 MSPS) 79 97 ADS4246 (160 MSPS) 89 ADS4245 (125 MSPS) 93 ADS4242 (65 MSPS) 95 ADS4246 (160 MSPS) fIN = 170 MHz TYP ADS4246 (160 MSPS) 77 dBc dBc 89 ADS4245 (125 MSPS) 91 ADS4242 (65 MSPS) 93 ADS4246 (160 MSPS) 91 ADS4245 (125 MSPS) 89 ADS4242 (65 MSPS) 92 ADS4246 (160 MSPS) 96 ADS4245 (125 MSPS) 96 ADS4242 (65 MSPS) 98 ADS4246 (160 MSPS) 83 ADS4245 (125 MSPS) 92 ADS4242 (65 MSPS) 92 dBc dBc dBFS IMD f1 = 185 MHz, f2 = 190 MHz, each tone at –7 dBFS dBFS Crosstalk 20-MHz full-scale signal on channel under observation; 170-MHz fullscale signal on other channel 95 dB Input overload recovery Recovery to within 1% (of full-scale) for 6-dB overload with sine-wave input 1 Clock cycle PSRR For 100-mVPP signal on AVDD supply, up to 10 MHz > 30 dB Effective number of bits ENOB fIN = 70 MHz (ADS4245, ADS4242) fIN = 170 MHz (ADS4246) 11.5 LSBs Differential nonlinearity DNL fIN = 70 MHz (ADS4245, ADS4242) fIN = 170 MHz (ADS4246) Integrated nonlinearity INL fIN = 70 MHz (ADS4245, ADS4242) fIN = 170 MHz (ADS4246) AC power-supply rejection ratio 14 Submit Documentation Feedback –0.97 ±0.5 +1.7 LSBs ±2 ±5 LSBs Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 8.6 Electrical Characteristics: ADS4226, ADS4225, ADS4222 Typical values are at 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, 50% clock duty cycle, –1 dBFS differential analog input, LVDS interface, and 0-dB gain, unless otherwise noted. Minimum and maximum values are across the full temperature range: TMIN = –40°C to TMAX = 85°C, AVDD = 1.8 V, and DRVDD = 1.8 V. PARAMETER TEST CONDITIONS MIN TYP Resolution 12 fIN = 20 MHz ADS4226 (160 MSPS) 70.5 ADS4225 (125 MSPS) 70.8 ADS4222 (65 MSPS) 70.9 ADS4226 (160 MSPS) fIN = 70 MHz Signal-to-noise ratio SNR fIN = 100 MHz fIN = 300 MHz fIN = 20 MHz 68 70.5 ADS4222 (65 MSPS) 68 70.3 ADS4226 (160 MSPS) 70.1 ADS4225 (125 MSPS) 70.3 ADS4222 (65 MSPS) 70.2 67.5 SINAD fIN = 100 MHz 69.9 ADS4222 (65 MSPS) 69.9 ADS4226 (160 MSPS) 68.2 ADS4225 (125 MSPS) 68.1 ADS4222 (65 MSPS) 68.2 ADS4226 (160 MSPS) 70.4 ADS4225 (125 MSPS) 70.7 ADS4222 (65 MSPS) 70.8 fIN = 300 MHz fIN = 20 MHz 67 70.3 ADS4222 (65 MSPS) 67 70.2 ADS4226 (160 MSPS) 69.8 ADS4225 (125 MSPS) 70.1 ADS4222 (65 MSPS) 70.1 66.5 Spurious-free dynamic range SFDR fIN = 100 MHz 69.5 ADS4222 (65 MSPS) 68.7 ADS4226 (160 MSPS) 67.6 ADS4225 (125 MSPS) 67.5 ADS4222 (65 MSPS) 67.2 ADS4226 (160 MSPS) 86 ADS4225 (125 MSPS) 88 ADS4222 (65 MSPS) 91 fIN = 300 MHz Copyright © 2011–2015, Texas Instruments Incorporated dBFS dBFS dBFS dBFS dBFS dBFS dBFS dBFS dBc 84 ADS4225 (125 MSPS) 72.5 86 ADS4222 (65 MSPS) 72.5 88 ADS4226 (160 MSPS) 82 ADS4225 (125 MSPS) 85 ADS4222 (65 MSPS) 87 ADS4226 (160 MSPS) fIN = 170 MHz dBFS 69.3 ADS4225 (125 MSPS) ADS4226 (160 MSPS) fIN = 70 MHz dBFS 70.1 ADS4225 (125 MSPS) ADS4226 (160 MSPS) fIN = 170 MHz Bits 69.5 ADS4225 (125 MSPS) ADS4226 (160 MSPS) fIN = 70 MHz UNIT 70.3 ADS4225 (125 MSPS) ADS4226 (160 MSPS) fIN = 170 MHz Signal-to-noise and distortion ratio MAX 70 dBc 82 ADS4225 (125 MSPS) 88 ADS4222 (65 MSPS) 85 ADS4226 (160 MSPS) 78 ADS4225 (125 MSPS) 78 ADS4222 (65 MSPS) 74 Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 dBc dBc dBc 15 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com Electrical Characteristics: ADS4226, ADS4225, ADS4222 (continued) Typical values are at 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, 50% clock duty cycle, –1 dBFS differential analog input, LVDS interface, and 0-dB gain, unless otherwise noted. Minimum and maximum values are across the full temperature range: TMIN = –40°C to TMAX = 85°C, AVDD = 1.8 V, and DRVDD = 1.8 V. PARAMETER TEST CONDITIONS fIN = 20 MHz MIN 84 ADS4225 (125 MSPS) 86 ADS4222 (65 MSPS) 88 ADS4226 (160 MSPS) fIN = 70 MHz Total harmonic distortion THD fIN = 100 MHz fIN = 300 MHz fIN = 20 MHz 70 84 ADS4222 (65 MSPS) 71 85 ADS4226 (160 MSPS) 81 ADS4225 (125 MSPS) 83 ADS4222 (65 MSPS) 85 68 Second-harmonic distortion HD2 fIN = 100 MHz 84 ADS4222 (65 MSPS) 82 ADS4226 (160 MSPS) 76 ADS4225 (125 MSPS) 75 ADS4222 (65 MSPS) 73 ADS4226 (160 MSPS) 86 ADS4225 (125 MSPS) 88 ADS4222 (65 MSPS) 91 fIN = 300 MHz fIN = 20 MHz 72.5 86 ADS4222 (65 MSPS) 72.5 88 ADS4226 (160 MSPS) 82 ADS4225 (125 MSPS) 85 ADS4222 (65 MSPS) 87 70 Third-harmonic distortion HD3 fIN = 100 MHz 88 ADS4222 (65 MSPS) 85 ADS4226 (160 MSPS) 78 ADS4225 (125 MSPS) 78 ADS4222 (65 MSPS) 74 ADS4226 (160 MSPS) 92 ADS4225 (125 MSPS) 93 ADS4222 (65 MSPS) 95 fIN = 300 MHz 16 Submit Documentation Feedback dBc dBc dBc dBc dBc dBc dBc dBc dBc 86 ADS4225 (125 MSPS) 72.5 89 ADS4222 (65 MSPS) 72.5 90 ADS4226 (160 MSPS) 93 ADS4225 (125 MSPS) 89 ADS4222 (65 MSPS) 96 ADS4226 (160 MSPS) fIN = 170 MHz dBc 82 ADS4225 (125 MSPS) ADS4226 (160 MSPS) fIN = 70 MHz dBc 84 ADS4225 (125 MSPS) ADS4226 (160 MSPS) fIN = 170 MHz UNIT 80 ADS4225 (125 MSPS) ADS4226 (160 MSPS) fIN = 70 MHz MAX 81 ADS4225 (125 MSPS) ADS4226 (160 MSPS) fIN = 170 MHz TYP ADS4226 (160 MSPS) 70 dBc dBc 94 ADS4225 (125 MSPS) 90 ADS4222 (65 MSPS) 87 ADS4226 (160 MSPS) 80 ADS4225 (125 MSPS) 81 ADS4222 (65 MSPS) 81 dBc dBc Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 Electrical Characteristics: ADS4226, ADS4225, ADS4222 (continued) Typical values are at 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, 50% clock duty cycle, –1 dBFS differential analog input, LVDS interface, and 0-dB gain, unless otherwise noted. Minimum and maximum values are across the full temperature range: TMIN = –40°C to TMAX = 85°C, AVDD = 1.8 V, and DRVDD = 1.8 V. PARAMETER TEST CONDITIONS fIN = 20 MHz MIN 90 ADS4225 (125 MSPS) 95 ADS4222 (65 MSPS) 98 ADS4226 (160 MSPS) fIN = 70 MHz Worst spur (other than second and third harmonics) fIN = 100 MHz fIN = 300 MHz f1 = 46 MHz, f2 = 50 MHz, each tone at –7 dBFS Two-tone intermodulation distortion 76 94 ADS4222 (65 MSPS) 77 97 ADS4226 (160 MSPS) 89 ADS4225 (125 MSPS) 93 ADS4222 (65 MSPS) 95 91 93 ADS4226 (160 MSPS) 91 ADS4225 (125 MSPS) 89 ADS4222 (65 MSPS) 92 ADS4226 (160 MSPS) 96 ADS4225 (125 MSPS) 96 ADS4222 (65 MSPS) 98 ADS4226 (160 MSPS) 83 ADS4225 (125 MSPS) 92 ADS4222 (65 MSPS) 92 Input overload recovery Recovery to within 1% (of full-scale) for 6-dB overload with sine-wave input Integrated nonlinearity dBc dBc dBc 89 ADS4222 (65 MSPS) 20-MHz full-scale signal on channel under observation; 170-MHz fullscale signal on other channel Differential nonlinearity 75 ADS4225 (125 MSPS) Crosstalk Effective number of bits UNIT dBc dBc dBFS IMD f1 = 185 MHz, f2 = 190 MHz, each tone at –7 dBFS AC power-supply rejection ratio MAX 92 ADS4225 (125 MSPS) ADS4226 (160 MSPS) fIN = 170 MHz TYP ADS4226 (160 MSPS) PSRR ENOB DNL INL For 100-mVPP signal on AVDD supply, up to 10 MHz fIN = 70 MHz (ADS4225, ADS4222) fIN = 170 MHz (ADS4226) fIN = 70 MHz (ADS4225, ADS4222) fIN = 170 MHz (ADS4226) fIN = 70 MHz (ADS4225, ADS4222) fIN = 170 MHz (ADS4226) Copyright © 2011–2015, Texas Instruments Incorporated dBFS 95 dB 1 Clock cycle 30 dB ADS4226 (160 MSPS) 11.2 ADS4225 (125 MSPS) 11.3 ADS4222 (65 MSPS) 11.1 LSBs ADS4226 (160 MSPS) –0.8 ±0.13 +1.5 ADS4225 (125 MSPS) –0.8 ±0.13 +1.5 ADS4222 (65 MSPS) –0.8 ±0.13 +1.2 ADS4226 (160 MSPS) ±0.5 ±3.5 ADS4225 (125 MSPS) ±0.5 ±3.5 ADS4222 (65 MSPS) ±0.5 ±2.5 Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 LSBs LSBs 17 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com 8.7 Electrical Characteristics: General Typical values are at 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, 50% clock duty cycle, and –1 dBFS differential analog input, unless otherwise noted. Minimum and maximum values are across the full temperature range: TMIN = –40°C to TMAX = 85°C, AVDD = 1.8 V, and DRVDD = 1.8 V. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT ANALOG INPUTS Differential input voltage range 0 dB gain 2 VPP Differential input resistance At 200 MHz 0.75 kΩ Differential input capacitance At 200 MHz 3.7 pF Analog input bandwidth With 50-Ω source impedance, and 50-Ω termination 550 MHz 1.5 µA/MSPS Analog input common-mode current Per input pin of each channel Common-mode output voltage VCM 0.95 VCM output current capability V 4 mA DC ACCURACY Offset error –15 Temperature coefficient of offset error Gain error as a result of internal reference inaccuracy alone Gain error of channel alone 2.5 15 0.003 EGREF EGCHAN –2 2 ADS4246/ADS4226 (160 MSPS) ±0.1 ADS4245/ADS4225 (125 MSPS) ±0.1 ADS4242/ADS4222 (65 MSPS) ±0.1 Temperature coefficient of EGCHAN mV mV/°C %FS –1 %FS –1 Δ%/°C 0.002 POWER SUPPLY IAVDD Analog supply current ADS4246/ADS4226 (160 MSPS) 123 150 ADS4245/ADS4225 (125 MSPS) 105 130 ADS4242/ADS4222 (65 MSPS) 73 85 ADS4246/ADS4226 (160 MSPS) 111 135 ADS4245/ADS4225 (125 MSPS) 99 120 ADS4242/ADS4222 (65 MSPS) 78 95 ADS4246/ADS4226 (160 MSPS) 61 ADS4245/ADS4225 (125 MSPS) 49 ADS4242/ADS4222 (65 MSPS) 28 LVDS interface, 350-mV swing with 100-Ω external termination, fIN = 2.5 MHz IDRVDD Output buffer supply current CMOS interface, no load capacitance (1) fIN = 2.5 MHz IDRVDD Output buffer supply current Analog power ADS4246/ADS4226 (160 MSPS) 222 ADS4245/ADS4225 (125 MSPS) 189 ADS4242/ADS4222 (65 MSPS) 133 LVDS interface, 350-mV swing with 100-Ω external termination, fIN = 2.5 MHz Digital power CMOS interface, no load capacitance (1) fIN = 2.5 MHz Digital power ADS4246/ADS4226 (160 MSPS) 199 ADS4245/ADS4225 (125 MSPS) 179 ADS4242/ADS4222 (65 MSPS) 131 ADS4246/ADS4226 (160 MSPS) 109 ADS4245/ADS4225 (125 MSPS) 88 ADS4242/ADS4222 (65 MSPS) 50 Global power-down (1) 18 mA mA mA mW mW mW 25 mW In CMOS mode, the DRVDD current scales with the sampling frequency, the load capacitance on output pins, input frequency, and the supply voltage (see the CMOS Interface Power Dissipation section in the Application Information). Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 8.8 Digital Characteristics At AVDD = 1.8 V and DRVDD = 1.8 V, unless otherwise noted. DC specifications refer to the condition where the digital outputs do not switch, but are permanently at a valid logic level 0 or 1. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT DIGITAL INPUTS (RESET, SCLK, SDATA, SEN, CTRL1, CTRL2, CTRL3) (1) High-level input voltage All digital inputs support 1.8-V and 3.3-V CMOS logic levels Low-level input voltage All digital inputs support 1.8-V and 3.3-V CMOS logic levels SDATA, SCLK High-level input current Low-level input current (2) 1.3 V 0.4 V VHIGH = 1.8 V 10 µA SEN (3) VHIGH = 1.8 V 0 µA SDATA, SCLK VLOW = 0 V 0 µA SEN VLOW = 0 V 10 µA DIGITAL OUTPUTS, CMOS INTERFACE (DA[13:0], DB[13:0], CLKOUT, SDOUT) High-level output voltage DRVDD – 0.1 DRVDD Low-level output voltage V 0 0.1 V Output capacitance (internal to device) pF DIGITAL OUTPUTS, LVDS INTERFACE High-level output differential voltage VODH With an external 100-Ω termination 270 350 430 mV Low-level output differential voltage VODL With an external 100-Ω termination –430 –350 –270 mV 0.9 1.05 1.25 V Output common-mode voltage VOCM (1) (2) (3) SCLK, SDATA, and SEN function as digital input pins in serial configuration mode. SDATA, SCLK have internal 150-kΩ pull-down resistor. SEN has an internal 150-kΩ pull-up resistor to AVDD. Because the pull-up is weak, SEN can also be driven by 1.8-V or 3.3-V CMOS buffers. 8.9 Timing Requirements: LVDS and CMOS Modes (1) Typical values are at 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, sampling frequency = 160MSPS, sine wave input clock, 1.5 VPP clock amplitude, CLOAD = 5 pF (2), and RLOAD = 100 Ω (3), unless otherwise noted. Minimum and maximum values are across the full temperature range: TMIN = –40°C to TMAX = 85°C, AVDD = 1.8 V, and DRVDD = 1.7 V to 1.9 V. tA tJ Aperture delay Aperture delay matching Between the two channels of the same device Variation of aperture delay Between two devices at the same temperature and DRVDD supply MIN NOM MAX 0.5 0.8 1.1 Aperture jitter Wakeup time ADC latency ns ±70 ps ±150 ps 140 fS rms Time to valid data after coming out of STANDBY mode Time to valid data after coming out of GLOBAL power-down mode UNIT 50 100 µs 100 500 µs Default latency after reset 16 Clock cycles Digital functions enabled (EN DIGITAL = 1) 24 Clock cycles 1.5 2 ns 0.35 0.6 ns (4) DDR LVDS MODE (5) tSU tH (1) (2) (3) (4) (5) (6) Data setup time Data valid (6) to zero-crossing of CLKOUTP Data hold time Zero-crossing of CLKOUTP to data becoming invalid (6) Timing parameters are ensured by design and characterization and not tested in production. CLOAD is the effective external single-ended load capacitance between each output pin and ground RLOAD is the differential load resistance between the LVDS output pair. At higher frequencies, tPDI is greater than one clock period and overall latency = ADC latency + 1. Measurements are done with a transmission line of 100Ω characteristic impedance between the device and the load. Setup and hold time specifications take into account the effect of jitter on the output data and clock. Data valid refers to a logic high of +100 mV and a logic low of –100 mV. Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 19 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com Timing Requirements: LVDS and CMOS Modes(1) (continued) Typical values are at 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, sampling frequency = 160MSPS, sine wave input clock, 1.5 VPP clock amplitude, CLOAD = 5 pF(2), and RLOAD = 100 Ω(3), unless otherwise noted. Minimum and maximum values are across the full temperature range: TMIN = –40°C to TMAX = 85°C, AVDD = 1.8 V, and DRVDD = 1.7 V to 1.9 V. tPDI tRISE, tFALL MIN NOM MAX 5 6.1 7.5 UNIT Clock propagation delay Input clock rising edge cross-over to output clock rising edge cross-over LVDS bit clock duty cycle Duty cycle of differential clock, (CLKOUTPCLKOUTM) 49% Data rise time, Data fall time Rise time measured from –100 mV to +100 mV Fall time measured from +100 mV to –100 mV 1MSPS ≤ Sampling frequency ≤ 160MSPS 0.13 ns Rise time measured from –100 mV to +100 mV Fall time measured from +100 mV to –100 mV 1MSPS ≤ Sampling frequency ≤ 160MSPS 0.13 ns tCLKRISE Output clock rise time, , Output clock fall time tCLKFALL ns PARALLEL CMOS MODE tSU Data setup time Data valid (7) to zero-crossing of CLKOUT 1.6 2.5 ns tH Data hold time Zero-crossing of CLKOUT to data becoming invalid (7) 2.3 2.7 ns tPDI Clock propagation delay Input clock rising edge cross-over to output clock rising edge cross-over 4.5 6.4 Output clock duty cycle Duty cycle of output clock, CLKOUT 1MSPS ≤ Sampling frequency ≤ 160MSPS Data rise time, Data fall time Rise time measured from 20% to 80% of DRVDD Fall time measured from 80% to 20% of DRVDD 1MSPS ≤ Sampling frequency ≤ 160MSPS 1 ns Rise time measured from 20% to 80% of DRVDD Fall time measured from 80% to 20% of DRVDD 1MSPS ≤ Sampling frequency ≤ 160MSPS 1 ns tRISE, tFALL tCLKRISE Output clock rise time , Output clock fall time tCLKFALL (7) 8.5 ns 46% Data valid refers to a logic high of 1.26 V and a logic low of 0.54 V 8.10 Serial Interface Timing Characteristics (1) See the Register Initialization section. PARAMETER MIN TYP UNIT 20 MHz SCLK frequency (equal to 1/tSCLK) tSLOADS SEN to SCLK setup time 25 ns tSLOADH SCLK to SEN hold time 25 ns tDSU SDATA setup time 25 ns tDH SDATA hold time 25 ns (1) > DC MAX fSCLK Typical values at 25°C; minimum and maximum values across the full temperature range: TMIN = –40°C to TMAX = 85°C, AVDD = 1.8 V, and DRVDD = 1.8 V, unless otherwise noted. 8.11 Reset Timing (Only When Serial Interface Is Used) (1) See the Serial Register Readout section. PARAMETER CONDITIONS MIN t1 Power-on delay Delay from AVDD and DRVDD power-up to active RESET pulse t2 Reset pulse width Active RESET signal pulse width t3 Register write delay Delay from RESET disable to SEN active (1) 20 TYP MAX 1 UNIT ms 10 ns 1 100 µs ns Typical values at 25°C; minimum and maximum values across the full temperature range: TMIN = –40°C to TMAX = 85°C, unless otherwise noted. Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 Table 1. LVDS Timings at Lower Sampling Frequencies SAMPLING FREQUENCY (MSPS) SETUP TIME (ns) MIN TYP 65 5.9 80 4.5 105 tPDI, CLOCK PROPAGATION DELAY (ns) HOLD TIME (ns) MAX MIN TYP 6.6 0.35 5.2 0.35 3.1 3.6 125 2.3 150 1.7 MAX MIN TYP MAX 0.6 5 6.1 7.5 0.6 5 6.1 7.5 0.35 0.6 5 6.1 7.5 2.9 0.35 0.6 5 6.1 7.5 2.2 0.35 0.6 5 6.1 7.5 Table 2. CMOS Timings at Lower Sampling Frequencies TIMINGS SPECIFIED WITH RESPECT TO CLKOUT SAMPLING FREQUENCY (MSPS) SETUP TIME (ns) tPDI, CLOCK PROPAGATION DELAY (ns) HOLD TIME (ns) MIN TYP MIN TYP MIN TYP MAX 65 6.1 7.2 MAX 6.7 7.1 MAX 4.5 6.4 8.5 80 4.7 5.8 5.3 5.8 4.5 6.4 8.5 105 3.4 4.3 3.8 4.3 4.5 6.4 8.5 125 2.7 3.6 3.1 3.6 4.5 6.4 8.5 150 1.9 2.8 2.5 2.9 4.5 6.4 8.5 Table 3. High-Performance Modes (1) (2) PARAMETER DESCRIPTION High-performance mode Set the HIGH PERF MODE register bit to obtain best performance across sample clock and input signal frequencies. See Figure 5. Register address = 03h, data = 03h High-frequency mode Set the HIGH FREQ MODE CH A and HIGH FREQ MODE CH B register bits for high input signal frequencies greater than 200 MHz. See Figure 5. Register address = 4Ah, data = 01h Register address = 58h, data = 01h (1) (2) It is recommended to use these modes to obtain best performance. See the Serial Interface Configuration section for details on register programming. CLKM Input Clock CLKP tPDI Output Clock CLKOUT tSU Output Data (1) DAn, DBn tH Dn (1) Dn = bits D0, D1, D2, etc. of channels A and B. Figure 1. CMOS Interface Timing Diagram Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 21 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com N+4 N+3 N+2 N + 18 N + 17 N + 16 N+1 Sample N Input Signal tA Input Clock CLKP CLKM CLKOUTM CLKOUTP tPDI tH DDR LVDS 16 Clock Cycles tSU (1) (2) Output Data DAnP/M, DBnP/M O E O E N - 16 O E N - 15 O E N - 14 O O E N - 13 O E N - 12 E N-1 O E N O E O E O N+1 tPDI CLKOUT tSU Parallel CMOS 16 Clock Cycles Output Data DAn, DBn N - 16 N - 15 N - 14 tH (1) N - 13 N-1 N N+1 (1) ADC latency after reset. At higher sampling frequencies, tPDI is greater than one clock cycle, which then makes the overall latency = ADC latency + 1. (2) E = even bits (D0, D2, D4, etc.); O = odd bits (D1, D3, D5, etc.). Figure 2. Latency Timing Diagram 22 Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 CLKOUTM CLKOUTP DA0, DB0 D0 D1 D0 D1 DA2, DB2 D2 D3 D2 D3 DA4, DB4 D4 D5 D4 D5 DA6, DB6 D6 D7 D6 D7 DA8, DB8 D8 D9 D8 D9 DA10, DB10 D10 D11 D10 D11 DA12, DB12 D12 D13 D12 D13 Sample N Sample N + 1 Figure 3. ADS4246/45/42 LVDS Interface Timing Diagram CLKOUTM CLKOUTP DA0, DB0 D0 D1 D0 D1 DA2, DB2 D2 D3 D2 D3 DA4, DB4 D4 D5 D4 D5 DA6, DB6 D6 D7 D6 D7 DA8, DB8 D8 D9 D8 D9 DA10, DB10 D10 D11 D10 D11 Sample N Sample N + 1 Figure 4. ADS4226/25/22 LVDS Interface Timing Diagram Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 23 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com DAn_P DBn_P Logic 0 VODL = -350mV Logic 1 (1) VODH = +350mV (1) DAn_M DBn_M VOCM GND (1) With external 100-Ω termination. Figure 5. LVDS Output Voltage Levels 24 Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 8.12 Typical Characteristics 8.12.1 ADS4246 At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 0 0 SFDR = 89.8dBc SINAD = 72.8dBFS SNR = 72.9dBFS THD = 87.9dBc −20 −20 −40 Amplitude (dB) Amplitude (dB) −40 −60 −80 −100 −100 0 10 20 30 40 50 Frequency (MHz) 60 70 −120 80 Figure 6. FFT for 20-MHz Input Signal 10 20 30 40 50 Frequency (MHz) 60 70 80 0 SFDR = 76.5dBc SINAD = 68.4dBFS SNR = 69.3dBFS THD = 74.5dBc −20 Each Tone at −7dBFS Amplitude fIN1 = 185.1MHz fIN2 = 190.1MHz Two−Tone IMD = 83.6dBFS SFDR = 95.1dBFS −20 −40 Amplitude (dB) −40 −60 −60 −80 −80 −100 −100 −120 0 Figure 7. FFT for 170-MHz Input Signal 0 Amplitude (dB) −60 −80 −120 SFDR = 89.8dBc SINAD = 71.3dBFS SNR = 71.2dBFS THD = 88.2dBc 0 10 20 30 40 50 Frequency (MHz) 60 70 −120 80 Figure 8. FFT for 300-MHz Input Signal 0 10 20 30 40 50 Frequency (MHz) 60 70 80 Figure 9. FFT for Two-tone Input Signal 0 90 Each Tone at −7dBFS Amplitude fIN1 = 46.1MHz fIN2 = 50.1MHz Two−Tone IMD = 96.2dBFS SFDR = 103.2dBFS −20 85 SFDR (dBc) Amplitude (dB) −40 −60 80 75 −80 70 −100 Gain = 0dB Gain = 6dB −120 0 10 20 30 40 50 Frequency (MHz) 60 70 80 Figure 10. FFT for Two-Tone Input Signal Copyright © 2011–2015, Texas Instruments Incorporated 65 0 50 100 150 200 250 300 350 400 450 500 Input Frequency (MHz) Figure 11. SFDR vs Input Frequency Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 25 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com ADS4246 (continued) 74 74 73 73 72 72 71 71 70 70 SNR (dBFS) SNR (dBFS) At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 69 68 69 68 67 67 66 66 65 65 64 63 64 Gain = 0dB Gain = 6dB 0 50 100 150 200 250 300 350 400 450 63 500 Gain = 0dB Gain = 6dB 0 50 100 150 200 250 300 350 400 450 500 Input Frequency (MHz) Input Frequency (MHz) Figure 12. SNR vs Input Frequency Figure 13. SNR vs Input Frequency (CMOS) 90 72 71 86 70 69 SINAD (dBFS) 78 68 67 66 74 65 64 70 66 150MHz 170MHz 220MHz 0 0.5 1 1.5 2 2.5 3 3.5 4 Digital Gain (dB) 300MHz 400MHz 470MHz 4.5 5 5.5 62 6 Figure 14. SFDR vs Gain and Input Frequency 0 0.5 1 1.5 2.5 3 3.5 4 Digital Gain (dB) 4.5 5 5.5 6 77 Input Frequency = 150MHz 77 110 76 100 76 100 75 90 75 90 74 80 74 80 73 70 73 70 72 60 72 60 71 50 71 50 70 70 40 69 30 68 20 −70 40 SFDR(dBc) SFDR(dBFS) SNR 30 20 −70 −60 −50 −40 −30 Amplitude (dBFS) −20 −10 0 Figure 16. Performance vs Input Amplitude Submit Documentation Feedback SFDR (dBc, dBFS) 110 SNR (dBFS) SFDR(dBc,dBFS) 2 120 Input Frequency = 40MHz 26 300MHz 400MHz 470MHz Figure 15. SINAD vs Gain and Input Frequency 78 120 150MHz 170MHz 220MHz 63 SNR (dBFS) SFDR (dBc) 82 69 SFDR (dBc) SFDR (dBFS) SNR −60 −50 −40 −30 Amplitude (dBFS) −20 −10 68 0 67 Figure 17. Performance vs Input Amplitude Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 ADS4246 (continued) At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 75 77 120 Input Frequency = 40MHz 74 85 73.5 84 73 83 72.5 82 72 81 71.5 SFDR (dBc, dBFS) 86 SNR (dBFS) 74.5 87 SFDR (dBc) Input Frequency = 150MHz 110 76 100 75 90 74 80 73 70 72 60 71 50 70 69 40 80 0.8 0.85 71 1.1 0.9 0.95 1 1.05 Input CommonMode Voltage (V) SFDR (dBc) SFDR (dBFS) SNR 30 SFDR SNR 20 −70 Figure 18. Performance vs Input Common-Mode Voltage SNR (dBFS) 88 −60 −50 −40 −30 Amplitude (dBFS) −20 −10 68 0 67 Figure 19. Performance vs Input Common-Mode Voltage 72 91 Input Frequency = 150MHz Input Frequency = 150MHz 89 71.5 87 71 83 SNR (dBFS) 81 79 70.5 70 77 75 AVDD = 1.65 AVDD = 1.7 AVDD = 1.75 AVDD = 1.80 73 71 −40 −15 AVDD = 1.85 AVDD = 1.90 AVDD = 1.95 10 35 Temperature (°C) AVDD = 1.65 AVDD = 1.7 AVDD = 1.75 AVDD = 1.80 69.5 60 69 −40 85 Figure 20. SFDR vs Temperature and AVDD Supply 10 35 Temperature (°C) 74.5 84 72 71.5 71 SFDR (dBc) 72.5 SNR (dBFS) SFDR (dBc) Input Frequency = 40MHz 85 82 87 74 86 73.5 85 73 84 72.5 72 83 SFDR SNR 81 1.65 1.7 1.75 1.8 1.85 DRVDD Supply (V) 1.9 70.5 1.95 Figure 22. Performance vs DRVDD Supply Voltage Copyright © 2011–2015, Texas Instruments Incorporated 85 88 Input Frequency = 150MHz 83 60 Figure 21. SNR vs Temperature and AVDD Supply 73 86 −15 AVDD = 1.85 AVDD = 1.90 AVDD = 1.95 SNR (dBFS) SFDR (dBc) 85 SFDR SNR 82 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 71.5 2.2 Differential Clock Amplitude (VPP) Figure 23. Performance vs Input Clock Amplitude Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 27 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com ADS4246 (continued) At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 74 88.5 75 Input Frequency = 150MHz Input Frequency = 10MHz 84 74 83 73 82 72 81 71 80 70 79 69 73.5 88 73 THD (dBc) SNR (dBFS) SFDR (dBc) 87.5 72.5 87 SNR (dBFS) 85 72 86.5 71.5 86 68 78 SFDR SNR 77 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 SNR THD 67 2.2 85.5 25 30 Differential Clock Amplitude (VPP) Figure 24. Performance vs Input Clock Amplitude 35 40 45 50 55 60 Input Clock Duty Cycle (%) 65 70 75 71 Figure 25. Performance vs Input Clock Duty Cycle 80 1.5 Input Frequency=20MHz 74.11 RMS Noise = 1.17LSB 1.2 70 0.9 60 Code Occurrence (%) INL (LSB) 0.6 0.3 0 −0.3 −0.6 51.98 50 43.17 40 30 20 13.08 −0.9 13.88 10 −1.2 −1.5 1.69 0.06 0.01 0.11 1.33 0 0 4000 8000 12000 Output Code (LSB) 16000 Figure 26. Integrated Nonlinearity 8211 8212 8213 8214 8215 8216 8217 8218 8219 8220 Output Code (LSB) Figure 27. Output Noise Histogram (With Inputs Shorted to VCM) 8.12.2 ADS4245 At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 28 Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 ADS4245 (continued) At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 0 0 SFDR = 89.7dBc SINAD = 73dBFS SNR = 73.1dBFS THD = 88.4dBc −20 −20 −40 Amplitude (dB) Amplitude (dB) −40 −60 −80 −100 −100 0 10 20 30 40 Frequency (MHz) 50 −120 60 Figure 28. FFT for 20-MHz Input Signal 20 30 40 Frequency (MHz) 50 60 Each Tone at −7dBFS Amplitude fIN1 =185MHz fIN2 =190MHz Two−Tone IMD = 94dBFS SFDR = 92.8dBFS −20 −40 Amplitude (dB) −40 Amplitude (dB) 10 0 SFDR = 73.4dBc SINAD = 67.7dBFS SNR = 69.2dBFS THD = 72.3dBc −20 −60 −60 −80 −80 −100 −100 −120 0 Figure 29. FFT for 170-MHz Input Signal 0 0 10 20 30 40 Frequency (MHz) 50 −120 60 Figure 30. FFT for 300-MHz Input Signal 0 10 20 30 40 Frequency (MHz) 50 60 Figure 31. FFT for Two-Tone Input Signal 0 74 Each Tone at −7dBFS Amplitude fIN1 =46MHz fIN2 =50MHz Two−Tone IMD = 96.9dBFS SFDR = 105.3dBFS −20 73 72 71 −40 70 SNR (dBFS) Amplitude (dB) −60 −80 −120 SFDR = 86.7dBc SINAD = 71.2dBFS SNR = 71.4dBFS THD = 83.8dBc −60 69 68 67 −80 66 65 −100 64 −120 0 10 20 30 40 Frequency (MHz) 50 60 Figure 32. FFT for Two-Tone Input Signal Copyright © 2011–2015, Texas Instruments Incorporated 63 Gain = 0dB Gain = 6dB 0 50 100 150 200 250 300 350 400 450 500 Input Frequency (MHz) Figure 33. SNR vs Input Frequency Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 29 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com ADS4245 (continued) At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 74 94 92 73 90 88 71 86 70 84 SFDR (dBc) SNR (dBFS) 72 69 68 82 80 78 67 76 66 74 72 65 70 64 63 Gain = 0dB Gain = 6dB 0 50 100 150MHz 170MHz 220MHz 68 150 200 250 300 350 400 450 66 500 0 0.5 1 1.5 Input Frequency (MHz) Figure 34. SNR vs Input Frequency (CMOS) 2 2.5 3 3.5 4 Digital Gain (dB) 300MHz 400MHz 470MHz 4.5 5 5.5 6 Figure 35. SFDR vs Gain and Input Frequency 72 76.5 110 Input Frequency = 40MHz 71 76 100 70 90 75.5 80 75 70 74.5 60 74 50 73.5 68 67 66 SNR (dBFS) SFDR(dBc,dBFS) SINAD (dBFS) 69 65 64 62 0 0.5 1 1.5 300MHz 400MHz 470MHz 2 SFDR(dBc) SFDR(dBFS) SNR 40 2.5 3 3.5 4 Digital Gain (dB) 4.5 5 5.5 30 −70 6 Figure 36. SINAD vs Gain and Input Frequency −20 −10 0 72.5 73.8 Input Frequency = 40MHz 76 89 73.7 90 75 88 73.6 80 74 87 73.5 70 73 86 73.4 60 72 85 73.3 50 71 84 73.2 70 83 SFDR(dBc) SFDR(dBFS) SNR 40 30 −70 −60 −50 −40 −30 Amplitude (dBFS) −20 −10 73.1 SFDR SNR 0 69 Figure 38. Performance vs Input Amplitude Submit Documentation Feedback SFDR (dBc) 100 SNR (dBFS) SFDR(dBc,dBFS) −40 −30 Amplitude (dBFS) 90 Input Frequency = 150MHz 30 −50 Figure 37. Performance vs Input Amplitude 77 110 −60 73 SNR (dBFS) 150MHz 170MHz 220MHz 63 82 0.8 0.85 0.9 0.95 1 Input CommonMode (V) 1.05 73 1.1 Figure 39. Performance vs Input Common-Mode Voltage Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 ADS4245 (continued) At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 91 73 89 Input Frequency = 150MHz Input Frequency = 150MHz 87 72.75 85 72.5 83 72.25 81 72 79 71.75 77 71.5 75 71.25 89 87 SFDR (dBc) SNR (dBFS) SFDR (dBc) 85 83 81 79 77 75 71 −40 71 1.1 0.9 0.95 1 1.05 Input CommonMode Voltage (V) Figure 40. Performance vs Input Common-Mode Voltage 60 85 73 88 Input Frequency = 150MHz Input Frequency = 150MHz 87 72.5 72 86 72 85 71.5 84 71 SFDR (dBc) 72.5 71.5 71 AVDD = 1.65 AVDD = 1.7 AVDD = 1.75 AVDD = 1.80 AVDD = 1.85 AVDD = 1.90 AVDD = 1.95 70.5 70 −40 −15 70.5 83 SFDR SNR 10 35 Temperature (°C) 60 82 1.65 85 Figure 42. SNR vs Temperature and AVDD Supply 1.7 1.75 1.8 1.85 DRVDD Supply (V) 70 1.95 1.9 Figure 43. Performance vs DRVDD Supply Voltage 74.5 90 75 89 Input Frequency = 40MHz Input Frequency = 10MHz 74 88 74.5 88 73.5 87 74 87 73 86 73.5 86 72.5 85 73 72 84 85 THD (dBc) 89 SNR (dBFS) SFDR (dBc) 10 35 Temperature (°C) Figure 41. SFDR vs Temperature and AVDD Supply 73 SNR (dBFS) −15 72.5 SFDR SNR 84 0.2 0.4 0.6 0.8 1 SNR (dBFS) 0.85 AVDD = 1.85 AVDD = 1.9 AVDD = 1.95 1.2 1.4 1.6 1.8 2 71.5 2.2 Differential Clock Amplitude (VPP) Figure 44. Performance vs Input Clock Amplitude Copyright © 2011–2015, Texas Instruments Incorporated SNR (dBFS) 73 0.8 AVDD = 1.65 AVDD = 1.7 AVDD = 1.75 AVDD = 1.80 73 SFDR SNR SNR THD 83 25 30 35 40 45 50 55 60 Input Clock Duty Cycle (%) 65 70 75 72 Figure 45. Performance vs Input Clock Duty Cycle Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 31 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com ADS4245 (continued) At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 40 1.5 RMS Noise = 1.1LSB Input Frequency=20MHz 1.2 35 33.31 0.9 30 Code Occurrence (%) INL (LSB) 0.6 0.3 0 −0.3 −0.6 28.49 25 20 18.26 15 12.23 10 −0.9 4.52 5 −1.2 −1.5 2.46 0.47 0.01 0.23 0 0 4000 8000 12000 Output Code (LSB) 8212 8213 8214 8215 8216 8217 8218 8219 8220 8221 16000 Output Code (LSB) Figure 46. Integrated Nonlinearity Figure 47. Output Noise Histogram (With Inputs Shorted to VCM) 8.12.3 ADS4242 At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 0 0 SFDR = 91.6dBc SINAD = 73.2dBFS SNR = 73.3dBFS THD = 88.9dBc −20 −20 −40 Amplitude (dB) Amplitude (dB) −40 −60 −80 −100 −100 0 5 10 15 20 Frequency (MHz) 25 30 32.5 Figure 48. FFT for 20-MHz Input Signal 32 −60 −80 −120 SFDR = 88.6dBc SINAD = 71.2dBFS SNR = 71.4dBFS THD = 84.2dBc Submit Documentation Feedback −120 0 5 10 15 20 Frequency (MHz) 25 30 32.5 Figure 49. FFT for 170-MHz Input Signal Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 ADS4242 (continued) At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 0 0 SFDR = 76.7dBc SINAD = 68.8dBFS SNR = 69.4dBFS THD = 76.3dBc −20 −20 −40 Amplitude (dB) Amplitude (dB) −40 −60 −80 −100 −100 0 5 10 15 20 Frequency (MHz) 25 −120 30 32.5 Figure 50. FFT for 300-MHz Input Signal 0 5 10 15 20 Frequency (MHz) 25 30 32.5 Figure 51. FFT for Two-Tone Input Signal 0 95 Each Tone at −7dBFS Amplitude fIN1 =46MHz fIN2 =50MHz Two−Tone IMD = 98dBFS SFDR = 102.7dBFS −20 90 85 SFDR (dBc) −40 Amplitude (dB) −60 −80 −120 Each Tone at −7dBFS Amplitude fIN1 =185MHz fIN2 =190MHz Two−Tone IMD = 92.2dBFS SFDR = 93.4dBFS −60 80 −80 75 −100 70 −120 65 Gain = 0dB Gain = 6dB 0 5 10 15 20 Frequency (MHz) 25 30 32.5 100 150 200 250 300 350 400 450 500 Figure 53. SFDR vs Input Frequency 74 74 73 73 72 72 71 71 70 70 SNR (dBFS) SNR (dBFS) 50 Input Frequency (MHz) Figure 52. FFT for Two-Tone Input Signal 69 68 69 68 67 67 66 66 65 65 64 63 0 64 Gain = 0dB Gain = 6dB 0 50 100 150 200 250 300 350 400 450 500 63 Gain = 0dB Gain = 6dB 0 50 100 150 200 250 300 350 400 450 500 Input Frequency (MHz) Input Frequency (MHz) Figure 54. SNR vs Input Frequency Figure 55. SNR vs Input Frequency (CMOS) Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 33 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com ADS4242 (continued) At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 94 72 92 71 90 88 70 86 69 SINAD (dBFS) SFDR (dBc) 84 82 80 78 68 67 76 74 66 72 66 0 0.5 1 1.5 300MHz 400MHz 470MHz 2 150MHz 170MHz 220MHz 65 2.5 3 3.5 4 Digital Gain (dB) 4.5 5 5.5 64 6 Figure 56. SFDR vs Gain and Input Frequency 0.5 1 1.5 5 5.5 6 79 110 76.5 110 78 100 76 100 77 90 76 80 75 70 74 75.5 80 75 70 74.5 60 74 60 73 50 73.5 50 72 73 40 72.5 30 72 20 −70 SFDR(dBc) SFDR(dBFS) SNR 30 20 −70 −60 −50 −40 −30 Amplitude (dBFS) −20 −10 0 SFDR(dBc,dBFS) 90 SNR (dBFS) SFDR(dBc,dBFS) 4.5 Input Frequency = 150MHz 40 Figure 58. Performance vs Input Amplitude 91 71 SFDR(dBc) SFDR(dBFS) SNR −60 −50 −40 −30 Amplitude (dBFS) −20 −10 70 0 69 Figure 59. Performance vs Input Amplitude 74.2 85 74.1 84 72 71.9 Input Frequency = 40MHz 90.5 Input Frequency = 150MHz 71.8 82 71.7 81 71.6 80 71.5 89 73.8 88.5 73.7 SFDR (dBc) 83 73.9 SNR (dBFS) 74 89.5 90 SFDR (dBc) 2.5 3 3.5 4 Digital Gain (dB) 120 Input Frequency = 40MHz 88 73.6 79 71.4 87.5 73.5 78 71.3 87 73.4 77 71.2 73.3 76 86.5 86 0.8 SFDR SNR 0.85 0.9 0.95 1 1.05 Input CommonMode Voltage (V) 73.2 1.1 Figure 60. Performance vs Input Common-Mode Voltage 34 2 Figure 57. SINAD vs Gain and Input Frequency 77 120 0 300MHz 400MHz 470MHz Submit Documentation Feedback SNR (dBFS) 150MHz 170MHz 220MHz 68 75 0.8 SFDR SNR 0.85 0.9 0.95 1 1.05 Input CommonMode Voltage (V) SNR (dBFS) 70 71.1 71 1.1 Figure 61. Performance vs Input Common-Mode Voltage Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 ADS4242 (continued) At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 88 72 Input Frequency = 150MHz Input Frequency = 150MHz 86 71.5 SNR (dBFS) SFDR (dBc) 84 82 71 70.5 80 AVDD = 1.7 AVDD = 1.75 AVDD = 1.80 AVDD = 1.85 AVDD = 1.90 AVDD = 1.95 78 76 −40 −15 70 AVDD = 1.7 AVDD = 1.75 AVDD = 1.80 10 35 Temperature (°C) 60 69.5 −40 85 Figure 62. SFDR vs Temperature and AVDD Supply 10 35 Temperature (°C) 77 83 71 82 70 91 76 90 75 89 74 88 73 87 72 86 71 85 70 84 SFDR SNR 1.7 1.75 1.8 1.85 DRVDD Supply (V) 69 1.95 1.9 73 82 72 80 71 78 70 76 69 74 68 72 67 70 66 68 65 SFDR SNR 64 1.2 1.4 1.6 1.2 1.4 1.6 1.8 2 68 2.2 1.8 2 90 74.5 89 74 88 73.5 87 73 72.5 86 SNR THD 63 62 2.2 Differential Clock Amplitude (VPP) Figure 66. Performance vs Input Clock Amplitude Copyright © 2011–2015, Texas Instruments Incorporated 75 Input Frequency = 10MHz 64 66 1 1 91 THD (dBc) 84 0.8 0.8 74 SNR (dBFS) Input Frequency = 150MHz 0.6 0.6 Figure 65. Performance vs Input Clock Amplitude 75 88 0.4 0.4 69 Differential Clock Amplitude (VPP) Figure 64. Performance vs DRVDD Supply Voltage 86 SFDR SNR 83 0.2 SNR (dBFS) 81 1.65 SNR (dBFS) SFDR (dBc) 72 84 SNR (dBFS) 73 85 SFDR (dBc) Input Frequency = 40MHz 74 86 SFDR (dBc) 85 92 Input Frequency = 150MHz 62 0.2 60 Figure 63. SNR vs Temperature and AVDD Supply 75 87 −15 AVDD = 1.85 AVDD = 1.90 AVDD = 1.95 85 30 35 40 45 50 55 60 Input Clock Duty Cycle (%) 65 70 72 Figure 67. Performance Across Input Clock Duty Cycle Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 35 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com ADS4242 (continued) At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 1.5 40 1.2 35 RMS Noise = 1.1LSB 33.31 0.9 30 Code Occurrence (%) INL (LSB) 0.6 0.3 0 −0.3 28.49 25 20 18.26 15 12.23 −0.6 10 −0.9 4.52 5 −1.2 0.23 0.47 0.01 −1.5 0 4000 8000 Output Code (LSB) 12000 0 16000 8212 8213 8214 8215 8216 8217 8218 8219 8220 8221 Output Code (LSB) Figure 68. Integrated Nonlinearity Figure 69. Output Noise Histogram (With Inputs Shorted to VCM) 8.12.4 ADS4226 At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 0 0 SFDR = 89.7dBc SINAD = 70.5dBFS SNR = 70.6dBFS THD = 80.0dBc −20 −20 −40 Amplitude (dB) Amplitude (dB) −40 −60 −80 −100 −100 0 10 20 30 40 50 Frequency (MHz) 60 70 80 Figure 70. FFT for 20-MHz Input Signal 36 −60 −80 −120 SFDR = 90.1dBc SINAD = 69.5dBFS SNR = 69.6dBFS THD = 88.1dBc Submit Documentation Feedback −120 0 10 20 30 40 50 Frequency (MHz) 60 70 80 Figure 71. FFT for 170-MHz Input Signal Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 ADS4226 (continued) At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 0 0 Each Tone at −7dBFS Amplitude fIN1 = 185.1MHz fIN2 = 190.1MHz Two−Tone IMD = 86.5dBFS SFDR = 92.1dBFS −20 −20 −40 Amplitude (dB) Amplitude (dB) −40 −60 −60 −80 −80 −100 −100 −120 Each Tone at −7dBFS Amplitude fIN1 = 46.1MHz fIN2 = 50.1MHz Two−Tone IMD = 98.2dBFS SFDR = 101.7dBFS 0 10 20 30 40 50 Frequency (MHz) 60 70 −120 80 Figure 72. FFT for Two-Tone Input Signal 0 10 20 30 40 50 Frequency (MHz) 60 70 80 Figure 73. FFT for Two-Tone Input Signal 72 90 71 85 70 SNR (dBFS) SFDR (dBc) 69 80 75 68 67 66 65 70 64 Gain = 0dB Gain = 6dB 65 0 50 100 150 200 250 300 350 400 450 63 500 Gain = 0dB Gain = 6dB 0 50 100 150 200 250 300 350 400 450 500 Input Frequency (MHz) Input Frequency (MHz) Figure 74. SFDR vs Input Frequency Figure 75. SNR vs Input Frequency 90 72 71 86 70 82 SFDR (dBc) SNR (dBFS) 69 68 67 66 78 74 65 70 64 63 150MHz 170MHz 220MHz Gain = 0dB Gain = 6dB 0 50 100 150 200 250 300 350 400 450 500 Input Frequency (MHz) Figure 76. SNR vs Input Frequency (CMOS) Copyright © 2011–2015, Texas Instruments Incorporated 66 0 0.5 1 1.5 2 2.5 3 3.5 4 Digital Gain (dB) 300MHz 400MHz 470MHz 4.5 5 5.5 6 Figure 77. SFDR vs Gain and Input Frequency Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 37 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com ADS4226 (continued) At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 70 73 110 Input Frequency = 40MHz 100 68 90 72 80 71.5 70 71 60 70.5 50 70 66 65 64 150MHz 170MHz 220MHz 63 62 0 0.5 1 1.5 300MHz 400MHz 470MHz 2 SFDR(dBc) SFDR(dBFS) SNR 40 2.5 3 3.5 4 Digital Gain (dB) 4.5 5 5.5 30 −70 6 Figure 78. SINAD vs Gain and Input Frequency −50 −40 −30 Amplitude (dBFS) 72 80 71.5 70 71 60 70.5 50 70 40 69.5 SFDR(dBc) SFDR(dBFS) SNR −50 −40 −30 Amplitude (dBFS) −20 −10 0 SFDR (dBc) SFDR(dBc,dBFS) 90 SNR (dBFS) 72.5 −60 69 73 87 72.5 86 72 85 71.5 84 71 83 70.5 82 70 69.5 69 81 68.5 80 0.8 SFDR SNR Figure 80. Performance vs Input Amplitude 0.85 0.9 0.95 1 1.05 Input CommonMode Voltage (V) 69 1.1 Figure 81. Performance vs Input Common-Mode Voltage 70 72 84 0 Input Frequency = 40MHz 100 20 −70 −10 88 Input Frequency = 150MHz 30 −20 Figure 79. Performance vs Input Amplitude 73 110 −60 69.5 SNR (dBFS) SINAD (dBFS) 67 72.5 SNR (dBFS) SFDR(dBc,dBFS) 69 Input Frequency = 150MHz Input Frequency = 150MHz 83 71.5 82 71 81 70.5 80 70 79 69.5 78 69 69.8 69.6 SNR (dBFS) SNR (dBFS) SFDR (dBc) 69.4 69.2 69 68.8 68.6 68.4 68.5 77 SFDR SNR 76 0.8 0.85 0.9 0.95 1 1.05 Input CommonMode Voltage (V) 68 1.1 Figure 82. Performance vs Input Common-Mode Voltage 38 Submit Documentation Feedback 68.2 68 −40 AVDD = 1.7 AVDD = 1.75 AVDD = 1.80 AVDD = 1.85 AVDD = 1.90 AVDD = 1.95 −15 10 35 Temperature (°C) 60 85 Figure 83. SNR vs Temperature and AVDD Supply Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 ADS4226 (continued) At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 71.5 72 88 Input Frequency = 40MHz 71 87 71.5 85 70.5 86 71 84 70 85 70.5 83 69.5 84 70 69 83 82 SFDR (dBc) 86 SNR (dBFS) 69.5 SFDR SNR 81 1.65 1.7 1.75 1.8 1.85 DRVDD Supply (V) SFDR SNR 68.5 1.95 1.9 82 0.2 0.4 0.6 Figure 84. Performance vs DRVDD Supply Voltage 82 70 81 69.5 80 69 79 68.5 78 68 77 67.5 76 SFDR SNR 1 1.2 1.4 1.6 1.8 2 67 66.5 2.2 Differential Clock Amplitude (VPP) Figure 86. Performance vs Input Clock Amplitude THD (dBc) 70.5 SNR (dBFS) SFDR (dBc) 71 83 0.8 1.4 1.6 1.8 2 69 2.2 73 Input Frequency = 10MHz 84 0.6 1.2 88 Input Frequency = 150MHz 0.4 1 Figure 85. Performance vs Input Clock Amplitude 71.5 85 75 0.2 0.8 Differential Clock Amplitude (VPP) 88 72.5 87 72 86 71.5 86 71 86 70.5 85 70 SNR (dBFS) SFDR (dBc) Input Frequency = 150MHz SNR (dBFS) 87 69.5 84 SNR THD 84 25 30 35 40 45 50 55 60 Input Clock Duty Cycle (%) 65 70 75 69 Figure 87. Performance vs Input Clock Duty Cycle 8.12.5 ADS4225 At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 39 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com ADS4225 (continued) At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 0 0 SFDR = 89.7dBc SINAD = 70.6dBFS SNR = 72.6dBFS THD = 89.2dBc −20 −20 −40 Amplitude (dB) Amplitude (dB) −40 −60 −60 −80 −80 −100 −100 −120 SFDR = 73.5dBc SINAD = 66.9dBFS SNR = 67.9dBFS THD = 72.7dBc 0 10 20 30 40 Frequency (MHz) 50 −120 60 0 10 20 30 40 Frequency (MHz) 50 60 Figure 88. FFT for 20-MHz Input Signal Figure 89. FFT for 300-MHz Input Signal 0 90 Each Tone at −7dBFS Amplitude fIN1 = 185.1MHz fIN2 = 190.1MHz Two−Tone IMD = 93.4dBFS SFDR = 91.1dBFS −20 85 SFDR (dBc) Amplitude (dB) −40 −60 80 75 −80 70 −100 Gain = 0dB Gain = 6dB −120 0 10 20 30 40 Frequency (MHz) 50 65 60 71 71 70 70 69 69 SNR (dBFS) SNR (dBFS) 72 68 67 65 65 40 64 Gain = 0dB Gain = 6dB 100 150 200 250 300 200 250 300 350 400 450 500 67 66 50 150 68 66 0 100 Figure 91. SFDR vs Input Frequency 72 63 50 Input Frequency (MHz) Figure 90. FFT for Two-Tone Input Signal 64 0 350 400 450 500 63 Gain = 0dB Gain = 6dB 0 50 100 150 200 250 300 350 400 450 500 Input Frequency (MHz) Input Frequency (MHz) Figure 92. SNR vs Input Frequency Figure 93. SNR vs Input Frequency (CMOS) Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 ADS4225 (continued) At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 94 74 120 Input Frequency = 40MHz 92 110 73.5 88 100 73 86 90 72.5 80 72 70 71.5 60 71 50 70.5 SFDR (dBc, dBFS) 82 80 78 76 74 72 150MHz 170MHz 220MHz 68 66 70 40 70 0 0.5 1 1.5 2 2.5 3 3.5 4 Digital Gain (dB) 300MHz 400MHz 470MHz 4.5 5 5.5 20 −70 6 Figure 94. SFDR vs Gain and Input Frequency −60 −50 −40 −30 Amplitude (dBFS) 90 72 80 71.5 70 71 60 70.5 50 70 40 69.5 SFDR(dBc) SFDR(dBFS) SNR −50 −40 −30 Amplitude (dBFS) −20 −10 69 0 68.5 Figure 96. Performance vs Input Amplitude SFDR (dBc) 72.5 SNR (dBFS) SFDR(dBc,dBFS) 73 100 −60 0 69 72 Input Frequency = 40MHz 110 20 −70 −10 94 Input Frequency = 150MHz 30 −20 69.5 Figure 95. Performance vs Input Amplitude 73.5 120 SFDR (dBc) SFDR (dBFS) SNR 30 92 71.8 90 71.5 88 71.2 86 71 84 70.8 82 70.5 SNR (dBFS) SFDR (dBc) 84 SNR (dBFS) 90 70.2 80 SFDR SNR 78 0.8 0.85 0.9 0.95 1 Input CommonMode (V) 1.05 70 1.1 Figure 97. Performance vs Input Common-Mode Voltage 90 70.5 Input Frequency = 150MHz Input Frequency = 150MHz 88 70.2 86 70 69.8 82 SNR (dBFS) SFDR (dBc) 84 80 78 69.5 69.2 76 69 74 72 70 −40 AVDD = 1.7 AVDD = 1.75 AVDD = 1.80 −15 AVDD = 1.85 AVDD = 1.90 AVDD = 1.95 10 35 Temperature (°C) 68.8 60 85 Figure 98. SFDR vs Temperature and AVDD Supply Copyright © 2011–2015, Texas Instruments Incorporated 68.5 −40 AVDD = 1.7 AVDD = 1.75 AVDD = 1.80 AVDD = 1.85 AVDD = 1.90 AVDD = 1.95 −15 10 35 Temperature (°C) 60 85 Figure 99. SNR vs Temperature and AVDD Supply Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 41 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com ADS4225 (continued) At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 72 72 90 Input Frequency = 40MHz 71.5 89 71.5 86 71 88 71 85 70.5 87 70.5 84 70 86 70 69.5 85 83 SFDR (dBc) 87 SNR (dBFS) 69.5 SFDR SNR 82 1.65 1.7 1.75 1.8 1.85 DRVDD Supply (V) SFDR SNR 69 1.95 1.9 84 0.2 71 86 70.5 84 70 82 69.5 80 69 78 68.5 76 68 74 67.5 72 67 70 66.5 68 66 66 65.5 65 64 SFDR SNR 62 0.8 1 1.2 1.4 1.6 1.2 1.4 1.6 1.8 2 69 2.2 1.8 2 73 Input Frequency = 10MHz THD (dBc) SFDR (dBc) 88 0.6 1 90 71.5 SNR (dBFS) Input Frequency = 40MHz 0.4 0.8 Figure 101. Performance vs Input Clock Amplitude 72 92 60 0.2 0.6 Differential Clock Amplitude (VPP) Figure 100. Performance vs DRVDD Supply Voltage 90 0.4 89 72.5 88 72 87 71.5 86 71 85 70.5 84 70 69.5 83 THD SNR 64.5 64 2.2 Differential Clock Amplitude (VPP) Figure 102. Performance vs Input Clock Amplitude SNR (dBFS) SFDR (dBc) Input Frequency = 150MHz SNR (dBFS) 88 82 30 35 40 45 50 55 60 Input Clock Duty Cycle (%) 65 70 69 Figure 103. Performance vs Input Clock Duty Cycle 8.12.6 ADS4222 At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 42 Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 ADS4222 (continued) At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 0 0 SFDR = 90.9dBc SINAD = 70.8dBFS SNR = 70.9dBFS THD = 88.1dBc −20 −20 −40 Amplitude (dB) Amplitude (dB) −40 −60 −80 −100 −100 0 5 10 15 20 Frequency (MHz) 25 −120 30 32.5 Figure 104. FFT for 20-MHz Input Signal 10 15 20 Frequency (MHz) 25 30 32.5 Each Tone at −7dBFS Amplitude fIN1 = 185.1MHz fIN2 = 190.1MHz Two−Tone IMD = 91.6dBFS SFDR = 94.9dBFS −20 −40 Amplitude (dB) −40 Amplitude (dB) 5 0 SFDR = 88.8dBc SINAD = 72.6dBFS SNR = 72.6dBFS THD = 89.2dBc −20 −60 −60 −80 −80 −100 −100 −120 0 Figure 105. FFT for 170-MHz Input Signal 0 0 5 10 15 20 Frequency (MHz) 25 −120 30 32.5 Figure 106. FFT for 300-MHz Input Signal 0 5 10 15 20 Frequency (MHz) 25 30 32.5 Figure 107. FFT for Two-Tone Input Signal 0 95 Each Tone at −7dBFS Amplitude fIN1 = 46.1MHz fIN2 = 50.1MHz Two−Tone IMD = 98.9 dBFS SFDR = 100.4 dBFS −20 90 85 SFDR (dBc) −40 Amplitude (dB) −60 −80 −120 SFDR = 88.2dBc SINAD = 69.5dBFS SNR = 69.7dBFS THD = 84.9dBc −60 80 −80 75 −100 70 −120 65 Gain = 0dB Gain = 6dB 0 5 10 15 20 Frequency (MHz) 25 30 32 Figure 108. FFT for Two-Tone Input Signal Copyright © 2011–2015, Texas Instruments Incorporated 0 50 100 150 200 250 300 350 400 450 500 Input Frequency (MHz) Figure 109. SFDR vs Input Frequency Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 43 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com ADS4222 (continued) 72 72 71 71 70 70 69 69 SNR (dBFS) SNR (dBFS) At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 68 67 68 67 66 66 65 65 64 63 64 Gain = 0dB Gain = 6dB 0 50 100 150 200 250 300 350 400 450 63 500 Gain = 0dB Gain = 6dB 0 50 100 150 200 250 300 350 400 450 500 Input Frequency (MHz) Input Frequency (MHz) Figure 110. SNR vs Input Frequency Figure 111. SNR vs Input Frequency (CMOS) 94 71 150MHz 170MHz 220MHz 92 70 90 300MHz 400MHz 470MHz 88 69 86 68 SINAD (dBFS) SFDR (dBc) 84 82 80 78 67 66 76 74 65 72 70 150MHz 170MHz 220MHz 68 66 0 0.5 1 1.5 300MHz 400MHz 470MHz 2 64 Input Frequency = 150MHz 2.5 3 3.5 4 Digital Gain (dB) 4.5 5 5.5 63 6 Figure 112. SFDR vs Gain and Input Frequency 0.5 1 1.5 2 2.5 3 3.5 4 Digital Gain (dB) 4.5 5 5.5 6 Figure 113. SINAD vs Gain and Input Frequency 73.5 120 0 73.5 120 Input Frequency = 40MHz Input Frequency = 150MHz 110 73 100 110 73 100 72.5 71.5 70 60 71 50 SFDR(dBc,dBFS) 80 SNR (dBFS) SFDR (dBc, dBFS) 72 90 72 80 71.5 70 71 60 70.5 50 70 SNR (dBFS) 72.5 90 70.5 40 20 −70 −60 −50 −40 −30 Amplitude (dBFS) −20 −10 70 0 69.5 Figure 114. Performance vs Input Amplitude 44 69.5 40 SFDR(dBc) SFDR(dBFS) SNR 30 Submit Documentation Feedback SFDR(dBc) SFDR(dBFS) SNR 30 20 −70 −60 −50 −40 −30 Amplitude (dBFS) −20 −10 69 0 68.5 Figure 115. Performance vs Input Amplitude Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 ADS4222 (continued) At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 72 70.8 85 Input Frequency = 150MHz 71.8 84 70.6 90 71.6 83 70.4 89 71.4 82 70.2 88 71.2 81 70 87 71 80 69.8 86 70.8 79 69.6 85 70.6 78 69.4 84 70.4 77 69.2 83 70.2 76 SFDR SNR 82 0.8 0.85 SFDR (dBc) 91 SNR (dB) SFDR (dBc) Input Frequency = 40MHz 70 1.1 0.9 0.95 1 1.05 Input Common−Mode Voltage (V) SFDR SNR 75 0.8 Figure 116. Performance vs Input Common-Mode Voltage 0.85 SNR (dBFS) 92 69 68.8 1.1 0.9 0.95 1 1.05 Input Common−Mode Voltage (V) Figure 117. Performance vs Input Common-Mode Voltage 88 70 Input Frequency = 150MHz Input Frequency = 150MHz 87 86 69.8 85 SNR (dBFS) SFDR (dBc) 84 83 82 69.5 69.2 81 AVDD = 1.7 AVDD = 1.75 AVDD = 1.80 AVDD = 1.85 AVDD = 1.90 AVDD = 1.95 79 78 77 −40 −15 AVDD = 1.7 AVDD = 1.75 AVDD = 1.80 AVDD = 1.85 AVDD = 1.90 AVDD = 1.95 69 10 35 Temperature (°C) 60 68.8 −40 85 Figure 118. SFDR vs Temperature and AVDD Supply 10 35 Temperature (°C) 72.5 69.5 84 69 83 SFDR SNR 82 1.65 1.70 1.75 1.80 1.85 DRVDD Supply (V) 1.90 68.5 1.95 Figure 120. Performance vs DRVDD Supply Voltage Copyright © 2011–2015, Texas Instruments Incorporated SFDR (dBc) 70 SNR (dBFS) SFDR (dBc) Input Frequency = 40MHz 70.5 85 85 92 Input Frequency = 150MHz 86 60 Figure 119. SNR vs Temperature and AVDD Supply 71 87 −15 91 72 90 71.5 89 71 88 70.5 87 70 86 69.5 85 69 68.5 84 83 82 0.2 SNR (dBFS) 80 SFDR SNR 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 68 67.5 2.2 Differential Clock Amplitude (VPP) Figure 121. Performance vs Input Clock Amplitude Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 45 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com ADS4222 (continued) At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 71 72 94 Input Frequency = 10MHz 93 71.5 87 69 92 71 84 68 91 70.5 81 67 90 70 89 69.5 88 69 87 68.5 68 66 78 75 65 72 64 THD (dBc) 70 SNR (dBFS) SFDR (dBc) Input Frequency = 150MHz 90 69 63 66 62 86 63 61 85 60 2.2 84 SFDR SNR 60 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 SNR THD 30 35 40 Differential Clock Amplitude (VPP) Figure 122. Performance vs Input Clock Amplitude 45 50 55 60 Input Clock Duty Cycle (%) 65 70 SNR (dBFS) 93 67.5 67 Figure 123. Performance vs Input Clock Duty Cycle 8.12.7 General At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 0 0 Input Frequency = 40MHz 50mVPP Signal Superimposed on Input Common−Mode Voltage 0.95V −5 Input Frequency = 10MHz 50mVPP Signal Superimposed on AVDD Supply −5 −10 −10 −15 −15 −25 PSRR (dB) CMRR (dB) −20 −30 −35 −40 −20 −25 −30 −35 −45 −40 −50 −45 −55 −60 0 50 100 150 200 250 Frequency of Input Common−Mode Signal (MHz) 300 Figure 124. CMRR vs Test Signal Frequency 46 Submit Documentation Feedback −50 0 50 100 150 200 250 Frequency of Signal on Supply (MHz) 300 Figure 125. PSRR vs Test Signal Frequency Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 General (continued) At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 240 240 fIN = 2.5 MHz AVDD = 1.8V Input Frequency = 2.5MHz 220 220 200 180 180 DRVDD Power (mW) Analog Power (mW) 200 160 140 120 160 140 120 100 80 60 100 40 80 60 LVDS, 350mV Swing CMOS 20 0 20 40 60 80 100 120 Sampling Speed (MSPS) 140 0 160 Figure 126. Analog Power vs Sampling Frequency 0 20 40 60 80 100 120 Sampling Speed (MSPS) 140 160 Figure 127. Digital Power LVDS CMOS 260 Default EN Digital = 1 EN Digital = 1, Offset Correction Enabled 240 DRVDD Power (mW) 220 200 180 160 140 120 100 80 0 20 40 60 80 100 120 Sampling Speed (MSPS) 140 160 Figure 128. Digital Power in Various Modes (LVDS) Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 47 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com At TA = 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock, 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 8.12.8 Contour All graphs are at 25°C, AVDD = 1.8 V, DRVDD = 1.8 V, maximum rated sampling frequency, sine wave input clock. 1.5-VPP differential clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, High-Performance Mode disabled, 0-dB gain, DDR LVDS output interface, and 32k point FFT, unless otherwise noted. 160 160 79 83 150 150 Sampling Frequency (MSPS) 87 79 120 76 110 87 73 87 100 79 90 83 76 80 70 65 83 10 86 50 100 150 200 250 400 81 79 83 89 100 79 89 90 79 81 89 10 450 83 86 79 79 92 50 100 150 200 250 300 350 400 450 Input Frequency (MHz) Input Frequency (MHz) 75 70 83 86 110 73 350 79 83 120 70 65 300 83 86 86 81 130 80 73 83 87 91 83 83 140 87 130 77 79 73 87 140 Sampling Frequency (MSPS) 76 83 80 85 80 78 90 82 84 88 86 90 92 SFDR (dBc) SFDR (dBc) Figure 130. Spurious-Free Dynamic Range (6-dB Gain) Figure 129. Spurious-Free Dynamic Range (0-dB Gain) 160 160 67 73 72 70 69 Sampling Frequency (MSPS) 140 68 73 71 72 69 67 100 71 90 72 73 68 70 80 67.25 50 100 150 200 67.25 67.5 100 250 300 350 400 67.25 67.5 10 50 72 71 100 150 200 250 65.5 65 64.5 73 68 68.5 67.5 67 69.5 69 68 68.5 67 67.5 66 66.5 110 100 90 67 69.5 80 68.5 10 50 100 150 200 250 300 350 66.5 67 67.5 68 68.5 400 65.5 65 64.5 66 90 65.5 66.75 65 65.75 66.5 64.5 10 50 100 150 200 250 300 350 400 450 Input Frequency (MHz) 69 69.5 70 SNR (dBFS) Submit Documentation Feedback 64.5 65 70 65 450 Figure 133. ADS422x Signal-to-Noise Ratio (0-dB Gain) 48 65.5 65.75 66.5 Input Frequency (MHz) 66 67.5 66 100 66 69 70 65 450 120 110 80 66.5 67.5 68 66.25 66.5 130 66.25 69 70 70.5 Sampling Frequency (MSPS) Sampling Frequency (MSPS) 65.75 140 70 400 67 66 66.25 130 70.5 350 66.5 65.75 150 66.5 140 120 300 66 SNR (dBFS) 160 69 69.5 64.5 Figure 132. ADS424x Signal-to-Noise Ratio (6-dB Gain) 160 70 65.5 65 SNR (dBFS) 70.5 66 66.25 66.5 67 Input Frequency (MHz) 70 Figure 131. ADS424x Signal-to-Noise Ratio (0-dB Gain) 150 65 66.75 90 450 65.5 66.25 67 Input Frequency (MHz) 69 68 67 66 66.5 110 67 70 65 66.75 120 70 65 10 67 130 80 69 65 65.5 66 66.25 140 68 70 110 66.5 66.75 67 67 130 120 64.5 150 71 Sampling Frequency (MSPS) 150 70.5 64 64.5 65 65.5 66 66.5 SNR (dBFS) Figure 134. ADS422x Signal-to-Noise Ratio (6-dB Gain) Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 9 Detailed Description 9.1 Overview The ADS424x/422x belong to TI’s ultralow power family of dual-channel, 14-bit/12-bit, analog-to-digital converters (ADCs). High performance is maintained, while power is reduced for power-sensitive applications. In addition to its low power and high performance, the ADS424x/422x has a number of digital features and operating modes to enable design flexibility. 9.2 Functional Block Diagrams AVDD AGND DRVDD DRGND LVDS Interface DA0P DA0M DA2P DA2M DA4P INP_A Sampling Circuit INM_A Digital and DDR Serializer 14-Bit ADC DA4M DA6P DA6M DA8P DA8M DA10P DA10M DA12P DA12M CLKP Output Clock Buffer CLOCKGEN CLKM CLKOUTP CLKOUTM DB0P DB0M DB2P DB2M DB4P INP_B Sampling Circuit INM_B Digital and DDR Serializer 14-Bit ADC DB4M DB6P DB6M DB8P DB8M DB10P DB10M DB12P DB12M CTRL3 CTRL1 SDOUT CTRL2 SEN SCLK RESET ADS424x SDATA Control Interface Reference VCM Figure 135. ADS4246/45/42 Block Diagram Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 49 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com Functional Block Diagrams (continued) AVDD AGND DRVDD DRGND LVDS Interface DA0P DA0M DA2P DA2M DA4P INP_A Sampling Circuit INM_A Digital and DDR Serializer 12-Bit ADC DA4M DA6P DA6M DA8P DA8M DA10P DA10M CLKP Output Clock Buffer CLOCKGEN CLKM CLKOUTP CLKOUTM DB0P DB0M DB2P DB2M DB4P INP_B Sampling Circuit INM_B Digital and DDR Serializer 12-Bit ADC DB4M DB6P DB6M DB8P DB8M DB10P DB10M CTRL3 CTRL1 SDOUT CTRL2 SEN SCLK RESET ADS422x SDATA Control Interface Reference VCM Figure 136. ADS4226/25/22 Block Diagram 50 Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 9.3 Feature Description The ADS424x/422x are pin-compatible with the previous generation ADS62P49 family of data converters; this architecture enables easy migration. However, there are some important differences between the two device generations, summarized in Table 4. Table 4. Migrating from the ADS62P49 ADS62P49 FAMILY ADS424x/422x FAMILY PINS Pin 22 is NC (not connected) Pin 22 is AVDD Pins 38 and 58 are DRVDD Pins 38 and 58 are NC (do not connect, must be floated) Pins 39 and 59 are DRGND Pins 39 and 59 are NC (do not connect, must be floated) SUPPLY AVDD is 3.3 V AVDD is 1.8 V DRVDD is 1.8 V No change INPUT COMMON-MODE VOLTAGE VCM is 1.5 V VCM is 0.95 V SERIAL INTERFACE No change in protocol New serial register map Protocol: 8-bit register address and 8-bit register data EXTERNAL REFERENCE Supported Not supported 9.3.1 Analog Input The analog input consists of a switched-capacitor based, differential sample-and-hold (S/H) architecture. This differential topology results in very good ac performance even for high input frequencies at high sampling rates. The INP and INM pins must be externally biased around a common-mode voltage of 0.95 V, available on the VCM pin. For a full-scale differential input, each input pin (INP and INM) must swing symmetrically between VCM + 0.5 V and VCM – 0.5 V, resulting in a 2-VPP differential input swing. The input sampling circuit has a high 3 dB bandwidth that extends up to 550 MHz (measured from the input pins to the sampled voltage). Figure 137 shows an equivalent circuit for the analog input. Sampling Switch LPKG 2nH INP 10W CBOND 1pF 100W RESR 200W INM CPAR2 1pF RON 15W CSAMP 2pF 3pF 3pF LPKG 2nH Sampling Capacitor RCR Filter 10W CBOND 1pF RESR 200W CPAR1 0.5pF RON 10W 100W RON 15W CPAR2 1pF CSAMP 2pF Sampling Capacitor Sampling Switch Figure 137. Analog Input Equivalent Circuit Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 51 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com 9.3.1.1 Drive Circuit Requirements For optimum performance, the analog inputs must be driven differentially. This operation improves the commonmode noise immunity and even-order harmonic rejection. A 5Ω to 15Ω resistor in series with each input pin is recommended to damp out ringing caused by package parasitics. SFDR performance can be limited as a result of several reasons, including the effects of sampling glitches, nonlinearity of the sampling circuit, and nonlinearity of the quantizer that follows the sampling circuit. Depending on the input frequency, sample rate, and input amplitude, one of these factors plays a dominant part in limiting performance. At very high input frequencies (greater than approximately 300 MHz), SFDR is determined largely by the device sampling circuit nonlinearity. At low input amplitudes, the quantizer nonlinearity usually limits performance. Glitches are caused by the opening and closing of the sampling switches. The driving circuit should present a low source impedance to absorb these glitches. Otherwise, glitches could limit performance, primarily at low input frequencies (up to approximately 200 MHz). It is also necessary to present low impedance (less than 50Ω) for the common-mode switching currents. This configuration can be achieved by using two resistors from each input terminated to the common-mode voltage (VCM). The device includes an internal R-C filter from each input to ground. The purpose of this filter is to absorb the sampling glitches inside the device itself. The cutoff frequency of the R-C filter involves a trade-off. A lower cutoff frequency (larger C) absorbs glitches better, but it reduces the input bandwidth. On the other hand, with a higher cutoff frequency (smaller C), bandwidth support is maximized. However, the sampling glitches now must be supplied by the external drive circuit. This tradeoff has limitations as a result of the presence of the package bond-wire inductance. In the ADS424x/422x, the R-C component values have been optimized while supporting high input bandwidth (up to 550 MHz). However, in applications with input frequencies up to 200 MHz to 300 MHz, the filtering of the glitches can be improved further using an external R-C-R filter; see Figure 140 and Figure 141. In addition, the drive circuit may have to be designed to provide a low insertion loss over the desired frequency range and matched impedance to the source. Furthermore, the ADC input impedance must be considered. Figure 138 and Figure 139 show the impedance (ZIN = RIN || CIN) looking into the ADC input pins. 5 Differential Input Capacitance (pF) Differential Input Resistance (kW) 100 10 1 0.1 0.01 4 3.5 3 2.5 2 1.5 1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Input Frequency (GHz) Figure 138. ADC Analog Input Resistance (RIN) Across Frequency 52 4.5 Submit Documentation Feedback 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Input Frequency (GHz) Figure 139. ADC Analog Input Capacitance (CIN) Across Frequency Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 9.3.1.2 Driving Circuit Two example driving circuit configurations are shown in Figure 140 and Figure 141—one optimized for low bandwidth (low input frequencies) and the other one for high bandwidth to support higher input frequencies. Note that both of the drive circuits have been terminated by 50Ω near the ADC side. The termination is accomplished by a 25-Ω resistor from each input to the 1.5-V common-mode (VCM) from the device. This architecture allows the analog inputs to be biased around the required common-mode voltage. The mismatch in the transformer parasitic capacitance (between the windings) results in degraded even-order harmonic performance. Connecting two identical RF transformers back-to-back helps minimize this mismatch; good performance is obtained for high-frequency input signals. An additional termination resistor pair may be required between the two transformers, as shown in Figure 140, Figure 141, and Figure 142. The center point of this termination is connected to ground to improve the balance between the P and M sides. The values of the terminations between the transformers and on the secondary side must be chosen to obtain an effective 50 Ω (in the case of 50-Ω source impedance). 0.1mF T1 15W INx_P T2 0.1mF 0.1mF 25W 25W 3.3pF 25W RIN CIN 25W INx_M 1:1 1:1 15W 0.1mF VCM ADS42xx Figure 140. Drive Circuit with Low Bandwidth (for Low Input Frequencies Less Than 150 MHz) 0.1mF T1 5W INx_P T2 0.1mF 0.1mF 25W 50W 3.3pF 25W RIN CIN 50W INx_M 1:1 1:1 5W 0.1mF VCM ADS42xx Figure 141. Drive Circuit with High Bandwidth (for High Input Frequencies Greater Than 150 MHz and Less Than 270 MHz) 0.1mF T1 5W T2 INx_P 0.1mF 0.1mF 25W RIN CIN 25W INx_M 1:1 1:1 0.1mF 5W VCM ADS42xx Figure 142. Drive Circuit with Very High Bandwidth (Greater than 270 MHz) Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 53 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com All of these examples show 1:1 transformers being used with a 50-Ω source. As explained in the Drive Circuit Requirements section, this configuration helps to present a low source impedance to absorb the sampling glitches. With a 1:4 transformer, the source impedance is 200 Ω. The higher source impedance is unable to absorb the sampling glitches effectively and can lead to degradation in performance (compared to using 1:1 transformers). In almost all cases, either a band-pass or low-pass filter is required to obtain the desired dynamic performance, as shown in Figure 143. Such filters present low source impedance at the high frequencies corresponding to the sampling glitch and help avoid the performance loss with the high source impedance. 5W INx_P T1 0.1mF Differential Input Signal Band-Pass or Low-Pass Filter 0.1mF 100W RIN CIN 100W INx_M 1:4 5W VCM ADS42xx Figure 143. Drive Circuit with a 1:4 Transformer 9.3.2 Clock Input The ADS424x/422x clock inputs can be driven differentially (sine, LVPECL, or LVDS) or single-ended (LVCMOS), with little or no difference in performance between them. The common-mode voltage of the clock inputs is set to VCM using internal 5-kΩ resistors. This setting allows the use of transformer-coupled drive circuits for sine-wave clock or ac-coupling for LVPECL and LVDS clock sources are shown in Figure 144, Figure 145 and Figure 146. The internal clock buffer is shown in Figure 147. RT = termination resister, if necessary. 0.1mF 0.1mF Zo CLKP Differential Sine-Wave Clock Input CLKP RT Typical LVDS Clock Input 0.1mF 100W CLKM ADS42xx 0.1mF Zo CLKM Figure 144. Differential Sine-Wave Clock Driving Circuit Zo ADS42xx Figure 145. LVDS Clock Driving Circuit 0.1mF CLKP 150W Typical LVPECL Clock Input 100W Zo 0.1mF CLKM ADS42xx 150W Figure 146. LVPECL Clock Driving Circuit 54 Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 Clock Buffer LPKG 2nH 20W CLKP CBOND 1pF RESR 100W LPKG 2nH 5kW CEQ 2pF 20W CEQ VCM 5kW CLKM CBOND 1pF RESR 100W CEQ is 1 pF to 3 pF, and is the equivalent input capacitance of the clock buffer. Figure 147. Internal Clock Buffer A single-ended CMOS clock can be ac-coupled to the CLKP input, with CLKM connected to ground with a 0.1-μF capacitor, as shown in Figure 148. For best performance, the clock inputs must be driven differentially, thereby reducing susceptibility to common-mode noise. For high input frequency sampling, it is recommended to use a clock source with very low jitter. Band-pass filtering of the clock source can help reduce the effects of jitter. There is no change in performance with a non-50% duty cycle clock input. 0.1mF CMOS Clock Input CLKP VCM 0.1mF CLKM ADS42xx Figure 148. Single-Ended Clock Driving Circuit Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 55 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com 9.3.3 Digital Functions The device has several useful digital functions (such as test patterns, gain, and offset correction). These functions require extra clock cycles for operation and increase the overall latency and power of the device. These digital functions are disabled by default after reset and the raw ADC output is routed to the output data pins with a latency of 16 clock cycles. Figure 149 shows more details of the processing after the ADC. In order to use any of the digital functions, the EN DIGITAL bit must be set to 1. After this, the respective register bits must be programmed as described in the following sections and in the Register Maps section. Output Interface 12-/14-Bit ADC 12-Bit (ADS422x) 14-Bit (ADS424x) Digital Functions (Gain, Offset Correction, Test Patterns) DDR LVDS or CMOS EN DIGITAL Bit Figure 149. Digital Processing Block 9.3.4 Gain for SFDR/SNR Trade-off The ADS424x/422x include gain settings that can be used to get improved SFDR performance (compared to no gain). The gain is programmable from 0 dB to 6 dB (in 0.5-dB steps). For each gain setting, the analog input fullscale range scales proportionally, as shown in Table 5. The SFDR improvement is achieved at the expense of SNR; for each gain setting, the SNR degrades approximately between 0.5 dB and 1 dB. The SNR degradation is reduced at high input frequencies. As a result, the gain is very useful at high input frequencies because the SFDR improvement is significant with marginal degradation in SNR. Therefore, the gain can be used as a trade-off between SFDR and SNR. Note that the default gain after reset is 0 dB. Table 5. Full-Scale Range Across Gains GAIN (dB) 56 TYPE FULL-SCALE (VPP) 0 Default after reset 2 1 Fine, programmable 1.78 2 Fine, programmable 1.59 3 Fine, programmable 1.42 4 Fine, programmable 1.26 5 Fine, programmable 1.12 6 Fine, programmable 1 Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 9.3.5 Offset Correction The ADS424x/422x have an internal offset correction algorithm that estimates and corrects dc offset up to ±10 mV. The correction can be enabled using the ENABLE OFFSET CORR serial register bit. Once enabled, the algorithm estimates the channel offset and applies the correction every clock cycle. The time constant of the correction loop is a function of the sampling clock frequency. The time constant can be controlled using the OFFSET CORR TIME CONSTANT register bits, as described in Table 6. After the offset is estimated, the correction can be frozen by setting FREEZE OFFSET CORR = 0. Once frozen, the last estimated value is used for the offset correction of every clock cycle. Note that offset correction is disabled by default after reset. Table 6. Time Constant of Offset Correction Algorithm (1) OFFSET CORR TIME CONSTANT TIME CONSTANT, TCCLK (Number of Clock Cycles) 0000 1M 7 0001 2M 13 0010 4M 26 TIME CONSTANT, TCCLK × 1/fS (ms) (1) 0011 8M 52 0100 16M 105 0101 32M 210 0110 64M 419 0111 128M 839 1000 256M 1678 1001 512M 3355 1010 1G 6711 1011 2G 13422 1100 Reserved — 1101 Reserved — 1110 Reserved — 1111 Reserved — Sampling frequency, fS = 160 MSPS. 9.4 Device Functional Modes 9.4.1 Power-Down The ADS424x/422x have two power-down modes: global power-down and channel standby. These modes can be set using either the serial register bits or using the control pins CTRL1 to CTRL3 (as shown in Table 7). Table 7. Power-Down Settings CTRL1 CTRL2 CTRL3 Low Low Low Default Low Low High Not available Low High Low Not available Low High High Not available High Low Low Global power-down High Low High Channel A powered down, channel B is active High High Low Not available High High High MUX mode of operation, channel A and B data is multiplexed and output on DB[10:0] pins Copyright © 2011–2015, Texas Instruments Incorporated DESCRIPTION Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 57 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com 9.4.1.1 Global Power-Down In this mode, the entire chip (including ADCs, internal reference, and output buffers) are powered down, resulting in reduced total power dissipation of approximately 20 mW when the CTRL pins are used, and 3 mW when the PDN GLOBAL serial register bit is used. The output buffers are in high-impedance state. The wake-up time from global power-down to data becoming valid in normal mode is typically 100µs. 9.4.1.2 Channel Standby In this mode, each ADC channel can be powered down. The internal references are active, resulting in a quick wake-up time of 50 µs. The total power dissipation in standby is approximately 200 mW at 160 MSPS. 9.4.1.3 Input Clock Stop In addition to the previous modes, the converter enters a low-power mode when the input clock frequency falls below 1 MSPS. The power dissipation is approximately 160 mW. 9.5 Programming The ADS424x/422x can be configured independently using either parallel interface control or serial interface programming. 9.5.1 Parallel Configuration Only To put the device into parallel configuration mode, keep RESET tied high (AVDD). Then, use the SEN, SCLK, CTRL1, CTRL2, and CTRL3 pins to directly control certain modes of the ADC. The device can be easily configured by connecting the parallel pins to the correct voltage levels (as described in Table 8 to Table 11). There is no need to apply a reset and SDATA can be connected to ground. In this mode, SEN and SCLK function as parallel interface control pins. Some frequently-used functions can be controlled using these pins. Table 8 describes the modes controlled by the parallel pins. Table 8. Parallel Pin Definition PIN CONTROL MODE SCLK Low-speed mode selection SEN Output data format and output interface selection CTRL1 CTRL2 Together, these pins control the power-down modes CTRL3 9.5.2 Serial Interface Configuration Only To enable this mode, the serial registers must first be reset to the default values and the RESET pin must be kept low. SEN, SDATA, and SCLK function as serial interface pins in this mode and can be used to access the internal registers of the ADC. The registers can be reset either by applying a pulse on the RESET pin or by setting the RESET bit high. The Register Maps section describes the register programming and the register reset process in more detail. 9.5.3 Using Both Serial Interface and Parallel Controls For increased flexibility, a combination of serial interface registers and parallel pin controls (CTRL1 to CTRL3) can also be used to configure the device. To enable this option, keep RESET low. The parallel interface control pins CTRL1 to CTRL3 are available. After power-up, the device is automatically configured according to the voltage settings on these pins (see Table 11). SEN, SDATA, and SCLK function as serial interface digital pins and are used to access the internal registers of the ADC. The registers must first be reset to the default values either by applying a pulse on the RESET pin or by setting the RESET bit to '1'. After reset, the RESET pin must be kept low. The Register Maps section describes register programming and the register reset process in more detail. 58 Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 9.5.4 Parallel Configuration Details The functions controlled by each parallel pin are described in Table 9, Table 10, and Table 11. A simple way of configuring the parallel pins is shown in Figure 150. Table 9. SCLK Control Pin VOLTAGE APPLIED ON SCLK (1) DESCRIPTION Low Low-speed mode is disabled High Low-speed mode is enabled (1) Low-speed mode is enabled in the ADS4222/42 by default. Table 10. SEN Control Pin VOLTAGE APPLIED ON SEN DESCRIPTION 0 (+50 mV/0 mV) Twos complement and parallel CMOS output (3/8) AVDD (±50 mV) Offset binary and parallel CMOS output (5/8) 2AVDD (±50 mV) Offset binary and DDR LVDS output AVDD (0 mV/–50 mV) Twos complement and DDR LVDS output Table 11. CTRL1, CTRL2, and CTRL3 Pins CTRL1 CTRL2 CTRL3 Low Low Low Normal operation DESCRIPTION Low Low High Not available Low High Low Not available Low High High Not available High Low Low Global power-down High Low High Channel A standby, channel B is active High High Low Not available High High High MUX mode of operation, channel A and B data are multiplexed and output on the DB[13:0] pins. AVDD (5/8) AVDD 3R (5/8) AVDD GND AVDD 2R (3/8) AVDD 3R (3/8) AVDD To Parallel Pin Figure 150. Simple Scheme to Configure the Parallel Pins 9.5.5 Serial Interface Details The ADC has a set of internal registers that can be accessed by the serial interface formed by the SEN (serial interface enable), SCLK (serial interface clock), and SDATA (serial interface data) pins. Serial shift of bits into the device is enabled when SEN is low. Serial data SDATA are latched at every SCLK falling edge when SEN is active (low). The serial data are loaded into the register at every 16th SCLK falling edge when SEN is low. When the word length exceeds a multiple of 16 bits, the excess bits are ignored. Data can be loaded in multiples of 16bit words within a single active SEN pulse. The first eight bits form the register address and the remaining eight bits are the register data. The interface can work with SCLK frequencies from 20 MHz down to very low speeds (of a few hertz) and also with non-50% SCLK duty cycle. Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 59 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com 9.5.5.1 Register Initialization After power-up, the internal registers must be initialized to the default values. Initialization can be accomplished in one of two ways: 1. Either through hardware reset by applying a high pulse on the RESET pin (of width greater than 10ns), as shown in Figure 151; or 2. By applying a software reset. When using the serial interface, set the RESET bit high. This setting initializes the internal registers to the default values and then self-resets the RESET bit low. In this case, the RESET pin is kept low. Register Address SDATA A7 A6 A5 A4 A3 Register Data A2 A1 A0 D7 D6 D5 D4 tSCLK tDSU D3 D2 D1 D0 tDH SCLK tSLOADS tSLOADH SEN RESET Figure 151. Serial Interface Timing 9.5.5.2 Serial Register Readout The device includes a mode where the contents of the internal registers can be read back. This readback mode may be useful as a diagnostic check to verify the serial interface communication between the external controller and the ADC. To use readback mode, follow this procedure: 1. Set the READOUT register bit to 1. This setting disables any further writes to the registers. 2. Initiate a serial interface cycle specifying the address of the register (A7 to A0) whose content has to be read. 3. The device outputs the contents (D7 to D0) of the selected register on the SDOUT pin (pin 64). 4. The external controller can latch the contents at the SCLK falling edge. 5. To enable register writes, reset the READOUT register bit to 0. The serial register readout works with both CMOS and LVDS interfaces on pin 64. When READOUT is disabled, the SDOUT pin is in high-impedance state. If serial readout is not used, the SDOUT pin must float. 60 Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 Register Address A[7:0] = 00h SDATA 0 0 0 0 0 0 Register Data D[7:0] = 01h 0 0 0 0 0 0 0 0 0 1 SCLK SEN The SDOUT pin is in high-impedance state. SDOUT a) Enable serial readout (READOUT = 1) Register Address A[7:0] = 45h SDATA A7 A6 A5 A4 A3 A2 Register Data D[7:0] = XX (don’t care) A0 A1 D7 D6 D5 D4 D3 D2 D1 D0 0 0 0 0 0 1 0 0 SCLK SEN SDOUT The SDOUT pin functions as serial readout (READOUT = 1). b) Read contents of Register 45h. This register has been initialized with 04h (device is put into global power-down mode.) Figure 152. Serial Readout Timing Diagram Power Supply AVDD, DRVDD t1 RESET t2 t3 SEN A high pulse on the RESET pin is required in the serial interface mode when initialized through a hardware reset. For parallel interface operation, RESET must be permanently tied high. Figure 153. Reset Timing Diagram 9.5.6 Digital Output Information The ADS424x/422x provide 14-bit/12-bit digital data for each channel and an output clock synchronized with the data. 9.5.6.1 Output Interface Two output interface options are available: double data rate (DDR) LVDS and parallel CMOS. They can be selected using the serial interface register bit or by setting the proper voltage on the SEN pin in parallel configuration mode. Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 61 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com 9.5.6.2 DDR LVDS Outputs In this mode, the data bits and clock are output using low-voltage differential signal (LVDS) levels. Two data bits are multiplexed and output on each LVDS differential pair, as shown in Figure 154. Pins CLKOUTP CLKOUTM DB0_P LVDS Buffers DB0_M DB2_P DB2_M DB4_P 14-Bit ADC Data, Channel B DB4_M DB6_P DB6_M DB8_P DB8_M DB10_P DB10_M DB12_P DB12_M Output Clock Data Bits D0, D1 Data Bits D2, D3 Data Bits D4, D5 Data Bits D6, D7 Data Bits D8, D9 Data Bits D10, D11 Data Bits D12, D13 Figure 154. LVDS Interface Even data bits (D0, D2, D4, etc.) are output at the CLKOUTP rising edge and the odd data bits (D1, D3, D5, etc.) are output at the CLKOUTP falling edge. Both the CLKOUTP rising and falling edges must be used to capture all the data bits, as shown in Figure 155. 62 Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 CLKOUTM CLKOUTP DA0P/M, DB0P/M D0 D1 D0 D1 DA2P/M, DB2P/M D2 D3 D2 D3 DA4P/M, DB4P/M D4 D5 D4 D5 DA6P/M, DB6P/M D6 D7 D6 D7 DA8P/M, DB8P/M D8 D9 D8 D9 DA10P/M, DB10P/M D10 D11 D10 D11 DA12P/M, DB12P/M D12 D13 D12 D13 Sample N Sample N + 1 Figure 155. DDR LVDS Interface Timing 9.5.6.3 LVDS Buffer The equivalent circuit of each LVDS output buffer is shown in Figure 156. After reset, the buffer presents an output impedance of 100 Ω to match with the external 100-Ω termination. VDIFF High Low OUTP External 100W Load OUTM VOCM ROUT VDIFF Low High Default swing across 100-Ω load is ±350 mV. Use the LVDS SWING bits to change the swing. Figure 156. LVDS Buffer Equivalent Circuit The VDIFF voltage is nominally 350 mV, resulting in an output swing of ±350 mV with 100-Ω external termination. The VDIFF voltage is programmable using the LVDS SWING register bits from ±125 mV to ±570 mV. Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 63 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com Additionally, a mode exists to double the strength of the LVDS buffer to support 50-Ω differential termination, as shown in Figure 157. This mode can be used when the output LVDS signal is routed to two separate receiver chips, each using a 100-Ω termination. The mode can be enabled using the LVDS DATA STRENGTH and LVDS CLKOUT STRENGTH register bits for data and output clock buffers, respectively. The buffer output impedance behaves in the same way as a source-side series termination. By absorbing reflections from the receiver end, it helps to improve signal integrity. Receiver Chip # 1 (for example, GC5330) DAnP/M CLKIN1 100W CLKIN2 100W CLKOUTP CLKOUTM DBnP/M Receiver Chip # 2 ADS42xx Make LVDS CLKOUT STRENGTH = 1 Figure 157. LVDS Buffer Differential Termination 9.5.6.4 Parallel CMOS Interface In the CMOS mode, each data bit is output on separate pins as CMOS voltage level, every clock cycle, as Figure 158 shows. The rising edge of the output clock CLKOUT can be used to latch data in the receiver. It is recommended to minimize the load capacitance of the data and clock output pins by using short traces to the receiver. Furthermore, match the output data and clock traces to minimize the skew between them. 64 Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 DB0 DB1 ¼ DB2 ¼ 14-Bit ADC Data, Channel B DB11 DB12 DB13 SDOUT CLKOUT DA0 DA1 ¼ DA2 ¼ 14-Bit ADC Data, Channel A DA11 DA12 DA13 Figure 158. CMOS Outputs Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 65 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com 9.5.6.5 CMOS Interface Power Dissipation With CMOS outputs, the DRVDD current scales with the sampling frequency and the load capacitance on every output pin. The maximum DRVDD current occurs when each output bit toggles between 0 and 1 every clock cycle. In actual applications, this condition is unlikely to occur. The actual DRVDD current would be determined by the average number of output bits switching, which is a function of the sampling frequency and the nature of the analog input signal. This relationship is shown by the formula: Digital current as a result of CMOS output switching = CL × DRVDD × (N × FAVG), where CL = load capacitance, N × FAVG = average number of output bits switching. 9.5.6.6 Multiplexed Mode of Operation In this mode, the digital outputs of both channels are multiplexed and output on a single bus (DB[13:0] pins), as shown in Figure 159. The channel A output pins (DA[13:0]) are in 3-state. Because the output data rate on the DB bus is effectively doubled, this mode is recommended only for low sampling frequencies (less than 80MSPS). This mode can be enabled using the POWER-DOWN MODE register bits or using the CTRL[3:1] parallel pins. CLKM Input Clock CLKP tPDI Output Clock CLKOUT tSU Output Data DBn (1) Channel A DAn (2) tH Channel B DBn (2) (1) In multiplexed mode, both channels outputs come on the channel B output pins. (2) Dn = bits D0, D1, D2, etc. Channel A DAn (2) Figure 159. Multiplexed Mode Timing Diagram 9.5.6.7 Output Data Format Two output data formats are supported: twos complement and offset binary. The format can be selected using the DATA FORMAT serial interface register bit or by controlling the DFS pin in parallel configuration mode. In the event of an input voltage overdrive, the digital outputs go to the appropriate full-scale level. For a positive overdrive, the output code is FFFh for the ADS422x and 3FFFh for the ADS424x in offset binary output format; the output code is 7FFh for the ADS422x and 1FFFh for the ADS424x in twos complement output format. For a negative input overdrive, the output code is 0000h in offset binary output format and 800h for the ADS422x and 2000h for the ADS424x in twos complement output format. 66 Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 9.6 Register Maps Table 12 summarizes the functions supported by the serial interface. Table 12. Serial Interface Register Map (1) REGISTER ADDRESS REGISTER DATA A[7:0] (Hex) D7 D6 D5 00 0 0 0 01 03 0 0 0 0 D2 D1 D0 0 0 0 RESET READOUT 0 0 0 0 CH A GAIN 2B DATA FORMAT CH B GAIN 3D 0 0 3F 0 0 0 0 0 0 ENABLE OFFSET CORR 0 0 HIGH PERF MODE CH A TEST PATTERNS 0 0 0 0 CH B TEST PATTERNS 0 0 0 CUSTOM PATTERN D[13:8] 40 (1) (2) (3) D3 LVDS SWING 25 29 D4 CUSTOM PATTERN D[7:0] 41 LVDS CMOS CMOS CLKOUT STRENGTH 0 0 42 CLKOUT FALL POSN CLKOUT RISE POSN EN DIGITAL 0 0 DIS OBUF 0 45 STBY LVDS CLKOUT STRENGTH 4A 0 0 0 0 0 0 0 HIGH FREQ MODE CH B (2) 58 0 0 0 0 0 0 0 HIGH FREQ MODE CH A (2) LVDS DATA STRENGTH 0 0 PDN GLOBAL 0 0 BF CH A OFFSET PEDESTAL 0 0 C1 CH B OFFSET PEDESTAL 0 0 0 0 CF FREEZE OFFSET CORR 0 DB 0 0 0 0 0 0 0 LOW SPEED MODE CH B (3) EF 0 0 0 EN LOW SPEED MODE (3) 0 0 0 0 F1 0 0 0 0 0 0 EN LVDS SWING F2 0 0 0 0 LOW SPEED MODE CH A (3) 0 0 OFFSET CORR TIME CONSTANT 0 Multiple functions in a register can be programmed in a single write operation. All registers default to 0 after reset. These bits improve SFDR on high frequencies. The frequency limit is 200 MHz. Low-speed mode is not applicable for the ADS4242 and ADS4222. Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 67 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com 9.6.1 Description Of Serial Registers 7 0 6 0 5 0 4 0 Bits[7:2] Always write 0 Bit 1 RESET: Software reset applied 3 0 2 0 1 RESET 0 READOUT This bit resets all internal registers to the default values and self-clears to 0 (default = 1). Bit 0 READOUT: Serial readout This bit sets the serial readout of the registers. 0 = Serial readout of registers disabled; the SDOUT pin is placed in high-impedance state. 1 = Serial readout enabled; the SDOUT pin functions as a serial data readout with CMOS logic levels running from the DRVDD supply. See the Serial Register Readout section. 7 6 5 4 3 2 LVDS SWING Bits[7:2] 1 0 0 0 LVDS SWING: LVDS swing programmability These bits program the LVDS swing. Set the EN LVDS SWING bit to 1 before programming swing. 000000 = Default LVDS swing; ±350 mV with external 100-Ω termination 011011 = LVDS swing increases to ±410 mV 110010 = LVDS swing increases to ±465mV 010100 = LVDS swing increases to ±570 mV 111110 = LVDS swing decreases to ±200 mV 001111 = LVDS swing decreases to ±125mV Bits[1:0] Always write 0 7 0 6 0 5 0 4 0 Bits[7:2] Always write 0 Bits[1:0] HIGH PERF MODE: High-performance mode 00 01 10 11 68 = = = = 3 0 2 0 1 0 HIGH PERF MODE Default performance Do not use Do not use Obtain best performance across sample clock and input signal frequencies Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 7 6 5 4 3 0 CH A GAIN Bits[7:4] 2 1 CH A TEST PATTERNS 0 CH A GAIN: Channel A gain programmability These bits set the gain programmability in 0.5-dB steps for channel A. 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 = = = = = = = = = = = = = 0-dB gain (default after reset) 0.5-dB gain 1-dB gain 1.5-dB gain 2-dB gain 2.5-dB gain 3-dB gain 3.5-dB gain 4-dB gain 4.5-dB gain 5-dB gain 5.5-dB gain 6-dB gain Bit 3 Always write 0 Bits[2:0] CH A TEST PATTERNS: Channel A data capture These bits verify data capture for channel A. 000 = Normal operation 001 = Outputs all 0s 010 = Outputs all 1s 011 = Outputs toggle pattern. For the ADS424x, output data D[13:0] are an alternating sequence of 10101010101010 and 01010101010101. For the ADS422x, the output data D[11:0] are an alternating sequence of 101010101010 and 010101010101. 100 = Outputs digital ramp. For the ADS424x, output data increment by one LSB (14-bit) every clock cycle from code 0 to code 16383. For the ADS422x, output data increment by one LSB (12-bit) every fourth clock cycle from code 0 to code 4095. 101 = Outputs custom pattern; use registers 3Fh and 40h to set the custom pattern 110 = Unused 111 = Unused 7 0 6 0 5 0 4 3 DATA FORMAT Bits[7:5] Always write 0 Bits[4:3] DATA FORMAT: Data format selection 00 01 10 11 Bits[2:0] = = = = 2 0 1 0 0 0 Twos complement Twos complement Twos complement Offset binary Always write 0 Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 69 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 7 6 5 www.ti.com 4 CH B GAIN Bits[7:4] 3 0 2 1 CH B TEST PATTERNS 0 CH B GAIN: Channel B gain programmability These bits set the gain programmability in 0.5-dB steps for channel B. 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 = = = = = = = = = = = = = 0-dB gain (default after reset) 0.5-dB gain 1-dB gain 1.5-dB gain 2-dB gain 2.5-dB gain 3-dB gain 3.5-dB gain 4-dB gain 4.5-dB gain 5-dB gain 5.5-dB gain 6-dB gain Bit 3 Always write 0 Bits[2:0] CH B TEST PATTERNS: Channel B data capture These bits verify data capture for channel B. 000 = Normal operation 001 = Outputs all 0s 010 = Outputs all 1s 011 = Outputs toggle pattern. For the ADS424x, output data D[13:0] are an alternating sequence of 10101010101010 and 01010101010101. For the ADS422x, the output data D[11:0] are an alternating sequence of 101010101010 and 010101010101. 100 = Outputs digital ramp. For the ADS424x, output data increment by one LSB (14-bit) every clock cycle from code 0 to code 16383. For the ADS422x, output data increment by one LSB (12-bit) every fourth clock cycle from code 0 to code 4095. 101 = Outputs custom pattern; use registers 3Fh and 40h to set the custom pattern 110 = Unused 111 = Unused 70 Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 7 6 0 0 5 ENABLE OFFSET CORR 4 3 2 1 0 0 0 0 0 0 2 CUSTOM PATTERN D10 1 CUSTOM PATTERN D9 0 CUSTOM PATTERN D8 Bits[7:6] Always write 0 Bit 5 ENABLE OFFSET CORR: Offset correction setting This bit enables the offset correction. 0 = Offset correction disabled 1 = Offset correction enabled Bits[4:0] Always write 0 7 6 0 0 5 CUSTOM PATTERN D13 Bits[7:6] Always write 0 Bits[5:0] CUSTOM PATTERN D[13:8] 4 CUSTOM PATTERN D12 3 CUSTOM PATTERN D11 These are the six upper bits of the custom pattern available at the output instead of ADC data. Note that for the ADS424x, the custom pattern is 14-bit. The ADS422x custom pattern is 12-bit. 7 CUSTOM PATTERN D7 Bits[7:0] 6 CUSTOM PATTERN D6 5 CUSTOM PATTERN D5 4 CUSTOM PATTERN D4 3 CUSTOM PATTERN D3 2 CUSTOM PATTERN D2 1 CUSTOM PATTERN D1 0 CUSTOM PATTERN D0 CUSTOM PATTERN D[7:0] These are the eight upper bits of the custom pattern available at the output instead of ADC data. Note that for the ADS424x, the custom pattern is 14-bit. The ADS422x custom pattern is 12-bit; use the CUSTOM PATTERN D[13:2] register bits. Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 71 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 7 6 5 4 CMOS CLKOUT STRENGTH LVDS CMOS Bits[7:6] www.ti.com 3 0 2 0 1 0 DIS OBUF LVDS CMOS: Interface selection These bits select the interface. 00 = DDR LVDS interface 01 = DDR LVDS interface 10 = DDR LVDS interface 11 = Parallel CMOS interface Bits[5:4] CMOS CLKOUT STRENGTH These bits control the strength of the CMOS output clock. 00 = Maximum strength (recommended) 01 = Medium strength 10 = Low strength 11 = Very low strength Bits[3:2] Always write 0 Bits[1:0] DIS OBUF These bits power down data and clock output buffers for both the CMOS and LVDS output interface. When powered down, the output buffers are in 3-state. 00 = Default 01 = Power-down data output buffers for channel B 10 = Power-down data output buffers for channel A 11 = Power-down data output buffers for both channels as well as the clock output buffer 72 Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 7 6 CLKOUT FALL POSN Bits[7:6] 5 4 CLKOUT RISE POSN 1 0 0 0 of the output clock advances by 450 ps of the output clock advances by 150 ps of the output clock is delayed by 550 ps of the output clock is delayed by 150 ps of the output clock advances by 100 ps CLKOUT RISE POSN In LVDS mode: 00 = Default 01 = The rising edge 10 = The rising edge 11 = The rising edge In CMOS mode: 00 = Default 01 = The rising edge 10 = Do not use 11 = The rising edge Bit 3 2 0 CLKOUT FALL POSN In LVDS mode: 00 = Default 01 = The falling edge 10 = The falling edge 11 = The falling edge In CMOS mode: 00 = Default 01 = The falling edge 10 = Do not use 11 = The falling edge Bits[5:6] 3 EN DIGITAL of the output clock advances by 450 ps of the output clock advances by 150 ps of the output clock is delayed by 250 ps of the output clock is delayed by 150 ps of the output clock advances by 100 ps EN DIGITAL: Digital function enable 0 = All digital functions disabled 1 = All digital functions (such as test patterns, gain, and offset correction) enabled Bits[2:0] Always write 0 Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 73 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 7 STBY Bit 7 6 LVDS CLKOUT STRENGTH 5 LVDS DATA STRENGTH www.ti.com 4 3 2 1 0 0 0 PDN GLOBAL 0 0 STBY: Standby setting 0 = Normal operation 1 = Both channels are put in standby; wakeup time from this mode is fast (typically 50 µs). Bit 6 LVDS CLKOUT STRENGTH: LVDS output clock buffer strength setting 0 = LVDS output clock buffer at default strength to be used with 100-Ω external termination 1 = LVDS output clock buffer has double strength to be used with 50-Ω external termination Bit 5 LVDS DATA STRENGTH 0 = All LVDS data buffers at default strength to be used with 100-Ω external termination 1 = All LVDS data buffers have double strength to be used with 50-Ω external termination Bits[4:3] Always write 0 Bit 2 PDN GLOBAL 0 = Normal operation 1 = Total power down; all ADC channels, internal references, and output buffers are powered down. Wakeup time from this mode is slow (typically 100 µs). Bits[1:0] Always write 0 7 6 5 4 3 2 1 0 0 0 0 0 0 0 Bits[7:1] Always write 0 Bit 0 HIGH FREQ MODE CH B: High-frequency mode for channel B 0 HIGH FREQ MODE CH B 0 = Default 1 = Use this mode for high input frequencies 7 6 5 4 3 2 1 0 0 0 0 0 0 0 Bits[7:1] Always write 0 Bit 0 HIGH FREQ MODE CH A: High-frequency mode for channel A 0 HIGH FREQ MODE CH A 0 = Default 1 = Use this mode for high input frequencies 74 Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com 7 Bits[7:2] SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 6 5 4 CH A OFFSET PEDESTAL 3 2 1 0 0 0 CH A OFFSET PEDESTAL: Channel A offset pedestal selection When the offset correction is enabled, the final converged value after the offset is corrected is the ADC midcode value. A pedestal can be added to the final converged value by programming these bits. See the Offset Correction section. Channels can be independently programmed for different offset pedestals by choosing the relevant register address. For the ADS424x, the pedestal ranges from –32 to +31, so the output code can vary from midcode-32 to midcode+32 by adding pedestal D7-D2. For the ADS422x, the pedestal ranges from –8 to +7, so the output code can vary from midcode-8 to midcode+7 by adding pedestal D7-D4. Bits[1:0] ADS422x (Program Bits D[7:4]) ADS424x (Program Bits D[7:2]) 0111 = Midcode+7 0110 = Midcode+6 0101 = Midcode+5 … 0000 = Midcode 1111 = Midcode-1 1110 = Midcode-2 1101 = Midcode-3 … 1000 = Midcode-8 011111 = Midcode+31 011110 = Midcode+30 011101 = Midcode+29 … 000000 = Midcode 111111 = Midcode-1 111110 = Midcode-2 111101 = Midcode-3 … 100000 = Midcode-32 Always write 0 Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 75 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 7 Bits[7:2] 6 5 4 CH B OFFSET PEDESTAL www.ti.com 3 2 1 0 0 0 CH B OFFSET PEDESTAL: Channel B offset pedestal selection When offset correction is enabled, the final converged value after the offset is corrected is the ADC midcode value. A pedestal can be added to the final converged value by programming these bits; see the Offset Correction section. Channels can be independently programmed for different offset pedestals by choosing the relevant register address. For the ADS424x, the pedestal ranges from –32 to +31, so the output code can vary from midcode-32 to midcode+32 by adding pedestal D[7:2]. For the ADS422x, the pedestal ranges from –8 to +7, so the output code can vary from midcode-8 to midcode+7 by adding pedestal D[7:4]. Bits[1:0] 76 ADS422x (Program Bits D[7:4]) ADS424x (Program Bits D[7:2]) 0111 = Midcode+7 0110 = Midcode+6 0101 = Midcode+5 … 0000 = Midcode 1111 = Midcode-1 1110 = Midcode-2 1101 = Midcode-3 … 1000 = Midcode-8 011111 = Midcode+31 011110 = Midcode+30 011101 = Midcode+29 … 000000 = Midcode 111111 = Midcode-1 111110 = Midcode-2 111101 = Midcode-3 … 100000 = Midcode-32 Always write 0 Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com 7 FREEZE OFFSET CORR Bit 7 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 6 5 0 4 3 2 OFFSET CORR TIME CONSTANT 1 0 0 0 FREEZE OFFSET CORR: Freeze offset correction setting This bit sets the freeze offset correction estimation. 0 = Estimation of offset correction is not frozen (the EN OFFSET CORR bit must be set) 1 = Estimation of offset correction is frozen (the EN OFFSET CORR bit must be set); when frozen, the last estimated value is used for offset correction of every clock cycle. See the Offset Correction section. Bit 6 Always write 0 Bits[5:2] OFFSET CORR TIME CONSTANT The offset correction loop time constant in number of clock cycles. Refer to the Offset Correction section. Bits[1:0] Always write 0 7 6 5 4 3 2 1 0 0 0 0 0 0 0 Bits[7:1] Always write 0 Bit 0 LOW SPEED MODE CH B: Channel B low-speed mode enable 0 LOW SPEED MODE CH B This bit enables the low-speed mode for channel B. Set the EN LOW SPEED MODE bit to 1 before using this bit. 0 = Low-speed mode is disabled for channel B 1 = Low-speed mode is enabled for channel B 7 6 5 0 0 0 4 EN LOW SPEED MODE 3 2 1 0 0 0 0 0 Bits[7:5] Always write 0 Bit 4 EN LOW SPEED MODE: Enable control of low-speed mode through serial register bits (ADS42x5 and ADS42x6 only) This bit enables the control of the low-speed mode using the LOW SPEED MODE CH B and LOW SPEED MODE CH A register bits. 0 = Low-speed mode is disabled 1 = Low-speed mode is controlled by serial register bits Bits[3:0] Always write 0 Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 77 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 7 0 6 0 5 0 www.ti.com 4 0 Bits[7:2] Always write 0 Bits[1:0] EN LVDS SWING: LVDS swing enable 3 0 2 0 1 0 EN LVDS SWING These bits enable LVDS swing control using the LVDS SWING register bits. 00 = LVDS swing control using the LVDS SWING register bits is disabled 01 = Do not use 10 = Do not use 11 = LVDS swing control using the LVDS SWING register bits is enabled 7 6 5 4 0 0 0 0 3 LOW SPEED MODE CH A 2 1 0 0 0 0 Bits[7:4] Always write 0 Bit 3 LOW SPEED MODE CH A: Channel A low-speed mode enable This bit enables the low-speed mode for channel A. Set the EN LOW SPEED MODE bit to 1 before using this bit. 0 = Low-speed mode is disabled for channel A 1 = Low-speed mode is enabled for channel A Bits[2:0] 78 Always write 0 Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 www.ti.com SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 10 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 10.1 Application Information The ADS424x/422x belong to TI's ultralow-power family of dual-channel 12-bit and 14-bit analog-to-digital converters (ADCs). At every rising edge of the input clock, the analog input signal of each channel is simultaneously sampled. The sampled signal in each channel is converted by a pipeline of low-resolution stages. In each stage, the sampled/held signal is converted by a high-speed, low-resolution, flash sub-ADC. The difference between the stage input and the quantized equivalent is gained and propagates to the next stage. At every clock, each succeeding stage resolves the sampled input with greater accuracy. The digital outputs from all stages are combined in a digital correction logic block and digitally processed to create the final code after a data latency of 16 clock cycles. The digital output is available as either DDR LVDS or parallel CMOS and coded in either straight offset binary or binary twos complement format. The dynamic offset of the first stage sub-ADC limits the maximum analog input frequency to approximately 400 MHz (with 2-VPP amplitude) or approximately 600 MHz (with 1 VPP amplitude). Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246 79 ADS4222, ADS4225, ADS4226 ADS4242, ADS4245, ADS4246 SBAS533D – MARCH 2011 – REVISED DECEMBER 2015 www.ti.com 10.2 Typical Application 22 22 22 SPI Controller 22 DRVDD AVDD To FPGA 0.1 µF DB4M DRVDD 1 2 AGND 3 AGND 0.1 µF DB4P INM_A 4 5 DB6M INP_A DB6P 50 5 5 0.1 µF 50 AGND DB8M ADC Driver 50 AGND 0.1 µF 50 6 240 DB8P 240 CLKM 7 100 8 CLKP 9 0.1 µF DB10P AGND LVPECL Clock Driver DB10M VCM 10 0.1 µF AVDD DB12M 0.1 µF DB12P 50 AVDD 11 50 12 AGND 50 RESET INM_B 13 5 SCLK 0.1 µF 14 INP_B SEN 5 15 16 0.1 µF SDATA AVDD AGND AGND ADC Driver 50 17 64 18 63 19 62 20 61 21 60 22 59 23 58 24 57 25 56 26 55 27 54 28 53 29 52 30 51 31 50 32 49 SDOUT DB2P DB2M DB0P DB0M NC NC CLKOUTP CLKOUTM FPGA DA12P DA12M DA10P DA10M DA8P DA8M DRGND 48 DRVDD 47 DA6P 46 DA6M DA2P 45 DA4P DA4M 42 43 42 DA2M 41 DA0P 40 DA0M CTRL3 39 NC NC 38 37 AVDD AVDD 36 CTRL2 CTRL1 35 34 33 0.1 µF 22 0.1 µF 0.1 µF To FPGA AVDD DRVDD Figure 160. Example Schematic for ADS4246 10.2.1 Design Requirements Example design requirements are listed in Table 13 for the ADC portion of the signal chain. These do not necessarily reflect the requirements of an actual system, but rather demonstrate why the ADS4246 may be chosen for a system based on a set of requirements. Table 13. Example Design Requirements for ADS4246 Design Parameter Example Design Requirement ADS4246 CAPABILITY Sampling rate ≥ 122.88 Msps to allow 80 MHz of unaliased bandwidth Max sampling rate: 160 Msps Input frequency > 125 MHz to accommodate full 2nd nyquist zone Large signal –3 dB bandwidth: 400-MHz operation SNR > 68 dBFS at –1 dFBS, 170 MHz 70.4 dBFS at –1 dBFS, 170 MHz SDFR > 77 dBc at –1 dFBS, 170 MHz 82 dBc at –1 dBFS, 170 MHz Input full scale voltage 2 Vpp 2 Vpp Overload recovery time < 3 clock cycles 1 clock cycle 80 Digital interface DDR LVDS DDR LVDS Power consumption