ADC12EU050EB/NOPB

User's Guide SNAU020 – September 2013 ADC12EU050: Ultra-low Power, Octal, 12-bit, 45MSPS Sigma-Delta Analog-to-Digital Converter This Evaluation Board is used to evaluate one of the A/D Converter ADC12EU050. The ADC is a 12 bit converter that provides data at a rate of 45 MHz. The evaluation board is designed to be used with the WaveVision5™ Data Capture Board which is connected to a personal computer through a USB port and running WaveVision5™ software, operating under Microsoft Windows. The software can perform an FFT on the captured data upon command and, in addition to a frequency domain plot, shows dynamic performance in the form of SNR, SINAD, THD SFDR and ENOB. 1 2 3 4 5 6 7 Contents Board Assembly ............................................................................................................. 2 Quick Start ................................................................................................................... 2 Functional Description ...................................................................................................... 3 3.1 Analog Input ........................................................................................................ 3 3.2 ADC Reference ..................................................................................................... 3 3.3 ADC Input Clock ................................................................................................... 3 3.4 Power Supply Connections ....................................................................................... 4 3.5 Reset ................................................................................................................ 4 3.6 Sleep ................................................................................................................. 4 3.7 Input Common Mode .............................................................................................. 5 3.8 Default Jumper and Switch Settings ............................................................................ 5 Software and SPI Registers ............................................................................................... 5 4.1 SPI Registers ....................................................................................................... 5 Hardware Schematics ...................................................................................................... 6 Evaluation Board Layout ................................................................................................... 9 Evaluation Board Bill of Materials ....................................................................................... 13 List of Figures 1 Major Component Locations ............................................................................................... 2 2 Input clock circuit ............................................................................................................ 3 3 Power Supply Connections ................................................................................................ 4 4 Schematic - 1 of 3 .......................................................................................................... .......................................................................................................... Schematic - 3 of 3 .......................................................................................................... Layer 1: Top ................................................................................................................. Layer 2 : Internal Ground Plane ......................................................................................... Layer 3 : Internal Power Plane .......................................................................................... Layer 4: Bottom ............................................................................................................ 6 5 Schematic - 2 of 3 7 6 7 8 9 10 8 9 10 11 12 List of Tables 1 Board Jumpers and Switches ............................................................................................. 5 2 Bill of Materials............................................................................................................. 13 SNAU020 – September 2013 Submit Documentation Feedback ADC12EU050: Ultra-low Power, Octal, 12-bit, 45MSPS Sigma-Delta Analogto-Digital Converter Copyright © 2013, Texas Instruments Incorporated 1 Board Assembly 1 www.ti.com Board Assembly The ADC12EU050 Evaluation Board comes pre-assembled. Refer to the Bill of Materials in Section 7 for a description of components, to Figure 1 for major component placement and to Section 5 for the Evaluation Board schematic. Input Clock circuitry Inputs ADC12EU050 WV5 Connector Hardware Reset Sleep Power Connectors Figure 1. Major Component Locations 2 Quick Start Refer to Figure 1 for locations of jumpers, test points and major components. The board is configured by default to use an on board crystal clock source and internal reference. Refer to Section 3 for detailed information on jumper settings. You must have the WaveVision5™ software to test this board. You can download the latest version from the Texas Instruments website. 1. Connect the ADC12EU050 evaluation board to the WaveVision5™ Data Capture Board. 2. Apply power to the WaveVision5™ Data Capture Board. 3. Connect power to the ADC12EU050 board as described in Section 3.4, and power it up. 4. Connect the WaveVision5™ board to the computer using a USB cable. 5. Start the WaveVision5™ software. 6. Connect a signal from a 50-Ω source to connector a channel input. Be sure to use a bandpass filter before the Evaluation Board. 7. Adjust the input signal amplitude as needed to ensure that the signal does not over-range by examining an FFT of the output data with the WaveVision™ software. 2 ADC12EU050: Ultra-low Power, Octal, 12-bit, 45MSPS Sigma-Delta Analogto-Digital Converter Copyright © 2013, Texas Instruments Incorporated SNAU020 – September 2013 Submit Documentation Feedback Functional Description www.ti.com 3 Functional Description The ADC12EU050 Evaluation Board schematic is shown in Section 5. A list of default switch and jumper settings can be found in Section 3.8. 3.1 Analog Input The analog input is supplied through standard SMA connectors. The evaluation board is designed for single ended inputs, which are converted to differential by the transformers. It must be ensured that a high quality signal source is used so that the ADC dynamic performance can be properly evaluated. A bandpass filter on the input signal is highly recommended. 3.2 ADC Reference The ADC12EU050 can use an internal or external reference. This evaluation board is configured to use the internal reference. 3.3 ADC Input Clock The ADC12EU050 can only be clocked at 45MHz. The input clock circuit is shown in Figure 2. Figure 2. Input clock circuit Select “External Clock” with switch S2 which disables the on-board crystal oscillator. It enables the user to connect a single ended clock to P11. This clock is converted to a differential signal by the transformer T9. Selecting “On Board Clock” with switch S2 is not supported unless a 45MHz Crystal Oscillator is populated at IC1. The external clock amplitude and waveform are fairly flexible, but a 600mVpp differential square wave at the chip inputs is recommended. By changing the 0 ohm resistors R24, R25, R28 and R29 other clock input configurations can be realized. For example, a fully differential clock could be supplied, bypassing the on-board transformer. If a single ended clock is supplied to the ADC, then the LVDS termination resistor, R26, must be removed. SNAU020 – September 2013 Submit Documentation Feedback ADC12EU050: Ultra-low Power, Octal, 12-bit, 45MSPS Sigma-Delta Analogto-Digital Converter Copyright © 2013, Texas Instruments Incorporated 3 Functional Description 3.4 www.ti.com Power Supply Connections +1.8V Digital Ground +1.2V Digital Ground +1.2V Analog Ground Power to the board is supplied through the power connectors P14, P16 and P18. The required voltages are shown in Figure 3 and described underneath. Figure 3. Power Supply Connections P14: Analog power and ground • ADC12EU050 analog supply, VA. • Connect VA to 1.2V, AGND to ground • Current can be measured across P13 P16: Digital power and ground • ADC12EU050 digital supply, VD • Connect VD to 1.2V, DRGND to ground • Current can be measured across P15 P18: Output driver power and ground • ADC12EU050 output driver supply, VDR • Connect VDR to 1.8V, DRGND to ground (same as DRGND of P16) • Current can be measured across P17 Generally, all grounds can be tied together, as can analog and digital supplies (VA and VD). The data sheet for the ADC12EU050 specifies that the output driver supply voltage (VDR) can be 1.2V or 1.8V. Due to the design of the evaluation system, specifically the distance from the ADC12EU050 to the Xilinx Virtex4 FPGA on the WaveVision5™ board and the connector through which the LVDS outputs are routed, VDR should be kept at 1.8V. A VDR of 1.2V can be used, but in this case the LVDS current drive (I_drive, SPI register 0x18, bits 3:2) must be increased to 5mA. 3.5 Reset The reset button pulls the RSTb pin of the ADC12EU050 low, resetting the ADC. The reset button only affects the ADC, not any other component on the board, or on the WaveVision5™ board. 3.6 Sleep The sleep switch puts the ADC input sleep mode, by connecting the SLEEP pin to VDR. 4 ADC12EU050: Ultra-low Power, Octal, 12-bit, 45MSPS Sigma-Delta Analogto-Digital Converter Copyright © 2013, Texas Instruments Incorporated SNAU020 – September 2013 Submit Documentation Feedback Software and SPI Registers www.ti.com 3.7 Input Common Mode Jumper P21 can be used to force a common mode on the ADC inputs. In its default configuration, the evaluation board has capacitively coupled ADC inputs, and using the Input Common Mode jumper will not have any effect. 3.8 Default Jumper and Switch Settings On delivery, the board’s jumpers and switches should be set as defined in Table 1. Any directions are defined when the board is positioned as in Figure 1. Table 1. Board Jumpers and Switches Jumper or Switch 4 Default Position P2 Open P4 Closed P13 Closed P15 Closed P17 Closed P21 Open S2 Left (On Board Clock) S3 Left (Sleep mode not active) Software and SPI Registers The ADC12EU050 evaluation board is designed to be used with the WaveVision5™ data capture board and software. The latest version of the WaveVision5™ software must be used. 4.1 SPI Registers As described in the ADC12EU050 datasheet, there are many user registers accessible via the SPI interface. These registers can all be programmed via the “Registers” tab in the WaveVision5™ software. All registers and values are described in the ADC12EU050 data sheet, which is available from the Texas Instruments website. SNAU020 – September 2013 Submit Documentation Feedback ADC12EU050: Ultra-low Power, Octal, 12-bit, 45MSPS Sigma-Delta Analogto-Digital Converter Copyright © 2013, Texas Instruments Incorporated 5 Hardware Schematics 5 www.ti.com Hardware Schematics ADC12EU050 Figure 4. Schematic - 1 of 3 6 ADC12EU050: Ultra-low Power, Octal, 12-bit, 45MSPS Sigma-Delta Analog-toDigital Converter Copyright © 2013, Texas Instruments Incorporated SNAU020 – September 2013 Submit Documentation Feedback Hardware Schematics www.ti.com Figure 5. Schematic - 2 of 3 SNAU020 – September 2013 Submit Documentation Feedback ADC12EU050: Ultra-low Power, Octal, 12-bit, 45MSPS Sigma-Delta Analog-toDigital Converter Copyright © 2013, Texas Instruments Incorporated 7 Hardware Schematics www.ti.com Figure 6. Schematic - 3 of 3 8 ADC12EU050: Ultra-low Power, Octal, 12-bit, 45MSPS Sigma-Delta Analog-toDigital Converter Copyright © 2013, Texas Instruments Incorporated SNAU020 – September 2013 Submit Documentation Feedback Evaluation Board Layout www.ti.com 6 Evaluation Board Layout Figure 7. Layer 1: Top SNAU020 – September 2013 Submit Documentation Feedback ADC12EU050: Ultra-low Power, Octal, 12-bit, 45MSPS Sigma-Delta Analogto-Digital Converter Copyright © 2013, Texas Instruments Incorporated 9 Evaluation Board Layout www.ti.com Figure 8. Layer 2 : Internal Ground Plane 10 ADC12EU050: Ultra-low Power, Octal, 12-bit, 45MSPS Sigma-Delta Analogto-Digital Converter Copyright © 2013, Texas Instruments Incorporated SNAU020 – September 2013 Submit Documentation Feedback Evaluation Board Layout www.ti.com Figure 9. Layer 3 : Internal Power Plane SNAU020 – September 2013 Submit Documentation Feedback ADC12EU050: Ultra-low Power, Octal, 12-bit, 45MSPS Sigma-Delta Analogto-Digital Converter Copyright © 2013, Texas Instruments Incorporated 11 Evaluation Board Layout www.ti.com Figure 10. Layer 4: Bottom 12 ADC12EU050: Ultra-low Power, Octal, 12-bit, 45MSPS Sigma-Delta Analogto-Digital Converter Copyright © 2013, Texas Instruments Incorporated SNAU020 – September 2013 Submit Documentation Feedback Evaluation Board Bill of Materials www.ti.com 7 Evaluation Board Bill of Materials Table 2. Bill of Materials QTY. Designator Footprint Value Description 1 *1 QFN10X10-68 ADC12EU050 ADC 48 C1–C31, C33–C40, C42–C44, C46–C49, C51, C53, C55 CC1608-0603 100nF Capacitor (Semiconductor SIM Model) 1 C28 CC3216-1206 10uF Capacitor (Semiconductor SIM Model) 6 C32, C41, C45, C50, C52, C54 CC3225-1210 47uF Capacitor (Semiconductor SIM Model) 1 IC1 CSX750FJC Citizen CSX750FJC50.000M-UT Crystal Oscillator 1 J1 HMZD_2PR_RA_HDR HMZd – Tyco Electronics part no 6469028-1 HMZd Connector 60 pin 10 P1, P3, P5–P12 SMA 1 P2 HDR2X3 Header 2x3 Header, 3-Pin, Dual row 4 P14, P16, P18 LP2 Lumberg KRESS02 Terminal Block Terminal Block 4 P4, P13, P15, P17, P21 HDR1X2 Header2x1 Jumper Wire 1 Q1 SOT23 BCW66H NPN General Purpose Transistor 9 R33, R24, R25, R28, R29, R4, R8, R2, R3 CR1608-0603 0 Semiconductor Resistor 1 R15 CR1608-0603 2K Semiconductor Resistor 1 R13 CR1608-0603 4.7K Semiconductor Resistor 7 R11, R36, R37, R38, R1, R21, R23 CR1608-0603 10K Semiconductor Resistor RF Coaxial PCB Connector, MMCX; ThruHole, Vertical Mount Plug, 50 Ω Impedance 1 R6 CR1608-0603 33 Semiconductor Resistor 10 R9, R12, R14, R16–R19, R22, R30, R31 CR1608-0603 49.9 Semiconductor Resistor 4 R32, R5, R7, R10 CR1608-0603 100 Semiconductor Resistor 3 R20, R34, R35 CR2012-0805 10K ± 1% Semiconductor Resistor 1 R26 CR1005-0402 100 Semiconductor Resistor 1 R27 3296Y 25K Potentiometer 1 S1 PushButton OMRON B3S-1000 Push Button 1 S2 DIP-6 Tyco ASE22 Double-Pole, Double-Throw Switch 1 S3 SW-DIP1 EAO part no 09-03290-01 Single Switch 9 T1–T9 ADT1-6T Mini Circuits ADT1-6T Transformer 1 U1 DQFN_50M_16_2P5X3P5 FXL4TD245 4-bit level shifter 1 U2 SOIC8_05_WG244_L200 M24C02-WMN6P EEPROM, STMicroelectronics, M24C02-WMN6P SNAU020 – September 2013 Submit Documentation Feedback ADC12EU050: Ultra-low Power, Octal, 12-bit, 45MSPS Sigma-Delta Analogto-Digital Converter Copyright © 2013, Texas Instruments Incorporated 13 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. 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