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OPA2357AIDGST

OPA2357AIDGST

  • 厂商:

    BURR-BROWN(德州仪器)

  • 封装:

    TFSOP10

  • 描述:

    IC OPAMP VFB 2 CIRCUIT 10VSSOP

  • 数据手册
  • 价格&库存
OPA2357AIDGST 数据手册
Product Folder Order Now Support & Community Tools & Software Technical Documents OPA357, OPA2357 SBOS235F – MARCH 2002 – REVISED APRIL 2018 OPAx357 250-MHz, Rail-to-Rail I/O, CMOS Operational Amplifier With Shutdown 1 Features 3 Description • • • • • • • The OPA357 series of high-speed, voltage-feedback CMOS operational amplifiers is designed for video and other applications requiring wide bandwidth. These devices are unity-gain stable and can drive large output currents. Differential gain is 0.02% and differential phase is 0.09°. Quiescent current is only 4.9 mA per channel. 1 • • • • • • • Unity-Gain Bandwidth: 250 MHz Wide Bandwidth: 100-MHz GBW High Slew Rate: 150 V/µs Low Noise: 6.5 nV/√Hz Rail-to-Rail I/O High Output Current: > 100 mA Excellent Video Performance: – Differential Gain: 0.02%, Differential Phase: 0.09° – 0.1-dB Gain Flatness: 40 MHz Low Input Bias Current: 3 pA Quiescent Current: 4.9 mA Thermal Shutdown Supply Range: 2.5 V to 5.5 V Shutdown IQ < 6 µA MicroSIZE Package Create a Custom Design Using the OPA357 With the WEBENCH® Power Designer The OPA357 series of op amps is optimized for operation on single or dual supplies as low as 2.5 V (±1.25 V) and up to 5.5 V (±2.75 V). Common-mode input range extends beyond the supplies. The output swing is within 100 mV of the rails, supporting wide dynamic range. The single version (OPA357) comes in the miniature SOT23-6 package. The dual version (OPA2357) is offered in the VSSOP-10 package. The dual version features completely independent circuitry for lowest crosstalk and freedom from interaction. Both versions are specified over the extended –40°C to +125°C temperature range. Device Information(1) 2 Applications • • • • • • • • • • PART NUMBER Video Processing Ultrasound Optical Networking, Tunable Lasers Photodiode Transimpedance Amplifiers Active Filters High-Speed Integrators Analog-to-Digital (A/D) Converter Input Buffers Digital-to-Analog (D/A) Converter Output Amplifiers Barcode Scanners Communications PACKAGE BODY SIZE (NOM) OPA357 SOT23 (6) 2.90 mm × 1.60 mm OPA2357 VSSOP (10) 3.00 mm × 3.00 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Simplified Schematic V+ -VIN VOUT OPA357 +VIN V- Enable 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. OPA357, OPA2357 SBOS235F – MARCH 2002 – REVISED APRIL 2018 www.ti.com Table of Contents 1 2 3 4 5 6 Features .................................................................. Applications ........................................................... Description ............................................................. Revision History..................................................... Pin Configuration and Functions ......................... Specifications......................................................... 1 1 1 2 3 4 6.1 6.2 6.3 6.4 6.5 4 4 4 4 Absolute Maximum Ratings ...................................... ESD Ratings.............................................................. Recommended Operating Conditions....................... Thermal Information .................................................. Electrical Characteristics: VS = +2.7-V to +5.5-V Single-Supply ............................................................. 6.6 Typical Characteristics .............................................. 7 5 7 Detailed Description ............................................ 13 7.1 7.2 7.3 7.4 Overview ................................................................. Functional Block Diagram ....................................... Feature Description................................................. Device Functional Modes........................................ 13 13 14 19 8 Application and Implementation ........................ 20 8.1 Application Information............................................ 20 8.2 Typical Applications ............................................... 20 9 Power Supply Recommendations...................... 26 9.1 Power Dissipation ................................................... 26 10 Layout................................................................... 26 10.1 Layout Guidelines ................................................. 26 10.2 Layout Example .................................................... 26 11 Device and Documentation Support ................. 27 11.1 11.2 11.3 11.4 11.5 11.6 11.7 11.8 Device Support...................................................... Documentation Support ........................................ Related Links ........................................................ Receiving Notification of Documentation Updates Community Resources.......................................... Trademarks ........................................................... Electrostatic Discharge Caution ............................ Glossary ................................................................ 27 27 27 27 28 28 28 28 12 Mechanical, Packaging, and Orderable Information ........................................................... 28 4 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision E (May 2009) to Revision F Page • Added Device Information table, Pin Functions table, ESD Ratings table, Recommended Operating Conditions table, Thermal Information table, Overview section, Functional Block Diagram section, Feature Description section, Device Functional Modes section, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section ................................................................................................................................................................ 1 • Changed MSOP to VSSOP throughout document ................................................................................................................ 1 • Deleted DDA package (SO-8 PowerPAD) from document ................................................................................................... 1 • Changed MSOP to VSSOP throughout document ................................................................................................................ 1 • Added WEBENCH Features bullet ........................................................................................................................................ 1 • Deleted OADI from DBV pin drawing ..................................................................................................................................... 3 • Deleted Package/Ordering Information table ......................................................................................................................... 4 • Deleted footnote from Signal input pins parameter in Absolute Maximum Ratings table ...................................................... 4 • Changed Temperature Range section of Electrical Characteristics table: changed θJA to RθJA and deleted Specified range, Operating range, and Storage range parameters ....................................................................................................... 6 • Added OPAx357 Comparison section and moved OPAx357 Related Products table to this section from page 1 ............. 14 • Deleted first paragraph of Power Dissipation section........................................................................................................... 26 • Changed PCB Layout title to Layout Guidelines .................................................................................................................. 26 • Deleted PowerPAD Thermall Enhanced Package and PowerPAD Assembly Process sections......................................... 26 • Added Custom Design With WEBENCH® Tools section ..................................................................................................... 27 2 Submit Documentation Feedback Copyright © 2002–2018, Texas Instruments Incorporated Product Folder Links: OPA357 OPA2357 OPA357, OPA2357 www.ti.com SBOS235F – MARCH 2002 – REVISED APRIL 2018 5 Pin Configuration and Functions OPA357: DBV Package 6-Pin SOT-23 Top View Out 1 6 V+ Out A 1 V- 2 5 Enable -In A 2 +In (1) OPA2357: DGS Package 10-Pin VSSOP Top View 3 4 10 V+ +In A 3 -In 9 Out B 8 -In B A B V- 4 7 +In B Enable A 5 6 Enable B Pin 1 of the SOT23-6 is determined by orienting the package marking as indicated in the diagram. Pin Functions PIN NAME DBV (SOT-23) DGS (VSSOP) I/O DESCRIPTION Enable 5 — — Amplifier power down. Low = disabled, high = normal operation (pin must be driven). Enable A — 5 — Amplifier power down, channel A. Low = disabled, high = normal operation (pin must be driven). Enable B — 6 — Amplifier power down, channel B. Low = disabled, high = normal operation (pin must be driven). –In 4 — I Inverting input pin –In A — 2 I Inverting input pin, channel A –In B — 8 I Inverting input pin, channel B +In 3 — I Noninverting input pin +In A — 3 I Noninverting input pin, channel A +In B — 7 I Noninverting input pin, channel B Out 1 — O Output pin Out A — 1 O Output pin, channel A Out B — 9 O Output pin, channel B V– 2 4 — Negative power supply V+ 6 10 — Positive power supply Submit Documentation Feedback Copyright © 2002–2018, Texas Instruments Incorporated Product Folder Links: OPA357 OPA2357 3 OPA357, OPA2357 SBOS235F – MARCH 2002 – REVISED APRIL 2018 www.ti.com 6 Specifications 6.1 Absolute Maximum Ratings (1) MIN Supply voltage, V+ to V− Voltage Signal input pins (V–) – 0.5 (V–) – 0.5 Output short-circuit (2) –55 Junction temperature Storage temperature, Tstg (2) V V 10 mA (V+) + 0.5 V Continuous Operating temperature (1) UNIT 7.5 (V+) + 0.5 Current Enable input MAX –65 150 °C 150 °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. Short-circuit to ground, one amplifier per package. 6.2 ESD Ratings VALUE V(ESD) (1) (2) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1) ±2000 Charged-device model (CDM), per JEDEC specification JESD22-C101 (2) ±250 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. 6.3 Recommended Operating Conditions over operating free-air temperature range (unless otherwise noted) MIN VS Total supply voltage TA Ambient temperature –40 NOM MAX 25 UNIT 5.5 V 125 °C 6.4 Thermal Information THERMAL METRIC (1) OPA357 OPA2357 DBV (SOT-23) DGS (VSSOP) 6 PINS 10 PINS UNIT RθJA Junction-to-ambient thermal resistance 166.4 171.3 °C/W RθJC(top) Junction-to-case (top) thermal resistance 104.6 58.2 °C/W RθJB Junction-to-board thermal resistance 38.9 93.1 °C/W ψJT Junction-to-top characterization parameter 23.6 6.8 °C/W ψJB Junction-to-board characterization parameter 38.7 91.4 °C/W RθJC(bot) Junction-to-case (bottom) thermal resistance — — °C/W (1) 4 For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report. Submit Documentation Feedback Copyright © 2002–2018, Texas Instruments Incorporated Product Folder Links: OPA357 OPA2357 OPA357, OPA2357 www.ti.com SBOS235F – MARCH 2002 – REVISED APRIL 2018 6.5 Electrical Characteristics: VS = +2.7-V to +5.5-V Single-Supply at TA = 25°C, RF = 0 Ω, RL = 1 kΩ, and connected to VS / 2 (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX ±2 ±8 UNIT OFFSET VOLTAGE VS = +5 V VOS Input offset voltage dVOS/dT VOS vs temperature PSRR Power-supply rejection ratio Specified temperature range, TA = –40°C to +125°C mV ±10 Specified temperature range, TA = –40°C to +125°C ±4 VS = +2.7 V to +5.5 V, VCM = (VS / 2) – 0.55 V ±200 µV/°C ±800 µV/V Specified temperature range, TA = –40°C to +125°C ±900 INPUT BIAS CURRENT IB Input bias current IOS Input offset current 3 ±50 pA ±1 ±50 pA NOISE en Input voltage noise density f = 1 MHz 6.5 nV/√Hz in Current noise density f = 1 MHz 50 fA/√Hz INPUT VOLTAGE RANGE VCM CMRR Common-mode voltage range Common-mode rejection ratio (V–) – 0.1 VS = +5.5 V, –0.1 V < VCM < +3.5 V 66 Specified temperature range, TA = –40°C to +125°C 64 VS = +5.5 V, –0.1 V < VCM < +5.6 V 56 Specified temperature range, TA = –40°C to +125°C 55 (V+) + 0.1 V 80 dB 68 INPUT IMPEDANCE Differential 1013 || 2 Ω || pF Common-mode 1013 || 2 Ω || pF OPEN-LOOP GAIN AOL Open-loop gain VS = +5 V, +0.3 V < VO < +4.7 V 94 Specified temperature range, TA = –40°C to +125°C, VS = +5 V, +0.4 V < VO < +4.6 V 90 110 dB FREQUENCY RESPONSE G = +1, VO = 100 mVPP, RF = 25 Ω f−3dB Small-signal bandwidth GBP Gain-bandwidth product G = +10 f0.1dB Bandwidth for 0.1-dB gain flatness G = +2, VO = 100 mVPP SR Slew rate Rise-and-fall time Settling time, 0.1% G = +2, VO = 100 mVPP 250 90 MHz 100 MHz 40 MHz VS = +5 V, G = +1, 4-V step 150 VS = +5 V, G = +1, 2-V step 130 VS = +3 V, G = +1, 2-V step 110 V/µs G = +1, VO = 100 mVPP, 10% to 90% 2 G = +1, VO = 2 VPP, 10% to 90% 11 VS = +5 V, G = +1, 2-V output step 30 ns 60 ns 5 ns Settling time, 0.01% ns Overload recovery time VIN × gain = VS HD2 2nd-order harmonic distortion G = +1, f = 1 MHz, VO = 2 VPP, RL = 200 Ω, VCM = 1.5 V –75 dBc HD3 3rd-order harmonic distortion G = +1, f = 1 MHz, VO = 2 VPP, RL = 200 Ω, VCM = 1.5 V –83 dBc Submit Documentation Feedback Copyright © 2002–2018, Texas Instruments Incorporated Product Folder Links: OPA357 OPA2357 5 OPA357, OPA2357 SBOS235F – MARCH 2002 – REVISED APRIL 2018 www.ti.com Electrical Characteristics: VS = +2.7-V to +5.5-V Single-Supply (continued) at TA = 25°C, RF = 0 Ω, RL = 1 kΩ, and connected to VS / 2 (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT FREQUENCY RESPONSE (continued) Differential gain error NTSC, RL = 150 Ω 0.02% Differential phase error NTSC, RL = 150 Ω 0.09 Degrees Channel-to-channel crosstalk, OPA2357 f = 5 MHz –100 dB OUTPUT VS = +5 V, RL = 1 kΩ, AOL > 94 dB Voltage output swing from rail Output current (1) (2) IO 0.1 Specified temperature range, TA = –40°C to +125°C, VS = +5 V, RL = 1 kΩ, AOL > 90 dB VS = +5 V, single 0.4 100 VS = +3 V, dual Open-loop output resistance V mA 50 Closed-loop output impedance RO 0.3 0.05 Ω 35 Ω POWER SUPPLY VS Specified voltage range 2.7 Operating voltage range VS = +5 V, enabled, IO = 0 V IQ Quiescent current (per amplifier) 5.5 2.5 to 5.5 4.9 Specified temperature range, TA = –40°C to +125°C V V 6 7.5 mA ENABLE, SHUTDOWN FUNCTION Disabled (logic−low threshold) 0.8 Enabled (logic−high threshold) Logic input current 2 V 200 nA Turn-on time 100 ns Turn-off time 30 ns 74 dB Off isolation Logic low V G = +1, 5 MHz, RL = 10 Ω Quiescent current (per amplifier) 3.4 6 µA THERMAL SHUTDOWN TJ Junction temperature Shutdown 160 Reset from shutdown 140 SOT23-6 150 VSSOP-10 150 °C TEMPERATURE RANGE RθJA (1) (2) 6 Thermal resistance °C/W See Figure 21 and Figure 23. Specified by design. Submit Documentation Feedback Copyright © 2002–2018, Texas Instruments Incorporated Product Folder Links: OPA357 OPA2357 OPA357, OPA2357 www.ti.com SBOS235F – MARCH 2002 – REVISED APRIL 2018 6.6 Typical Characteristics at TA = 25°C, VS = 5 V, G = +1, RF = 0 Ω, RL = 1 kΩ, and connected to VS / 2 (unless otherwise noted) 3 VO = 0.1 VPP, RF = 604 W 0 Normalized Gain (dB) 0 Normalized Gain (dB) 3 G = +1, RF = 25 W VO = 0.1 VPP G = +2, RF = 604 W -3 G = +5, RF = 604 W -6 G = +10, RF = 604 W -9 -12 -3 G = -1 -6 G = -5 G = -10 -12 -15 100k 1M 10M Frequency (Hz) 100M -15 100k 1G 1M 10M Frequency (Hz) 100M 1G Figure 2. Inverting Small-Signal Frequency Response Output Voltage (40 mV/div) Output Voltage (500 mV/div) Figure 1. Noninverting Small-Signal Frequency Response Time (20 ns/div) Time (20 ns/div) Figure 3. Noninverting Small-Signal Step Response Figure 4. Noninverting Large-Signal Step Response 0.5 0.4 Enabled 2.5 1.5 0.5 Normalized Gain (dB) 3.5 Disabled VO = 0.1 VPP 0.3 4.5 Disable Voltage (V) Output Voltage (400 mV/div) G = -2 -9 G = +1, RF = 25 W 0.2 0.1 0 -0.1 -0.2 G = +2, RF = 604 W -0.3 VOUT, fIN = 5 MHz -0.4 -0.5 100k Time (200 ns/div) Figure 5. Large-Signal Disable, Enable Response 1M 10M Frequency (Hz) 100M Figure 6. 0.1-dB Gain Flatness Submit Documentation Feedback Copyright © 2002–2018, Texas Instruments Incorporated Product Folder Links: OPA357 OPA2357 1G 7 OPA357, OPA2357 SBOS235F – MARCH 2002 – REVISED APRIL 2018 www.ti.com Typical Characteristics (continued) at TA = 25°C, VS = 5 V, G = +1, RF = 0 Ω, RL = 1 kΩ, and connected to VS / 2 (unless otherwise noted) -50 G = -1 f = 1 MHz RL = 200 W -60 -70 2nd-Harmonic -80 -90 VO = 2 VPP f = 1 MHz RL = 200 W -60 Harmonic Distortion (dBc) Harmonic Distortion (dBc) -50 -70 2nd-Harmonic -80 -90 3rd-Harmonic 3rd-Harmonic -100 -100 0 1 2 Output Voltage (VPP) 3 4 1 Figure 7. Harmonic Distortion vs Output Voltage VO = 2 VPP f = 1 MHz RL = 200 W -60 Harmonic Distortion (dBc) Harmonic Distortion (dBc) Figure 8. Harmonic Distortion vs Noninverting Gain -50 -50 10 Gain (V/V) -70 2nd-Harmonic -80 3rd-Harmonic -90 -100 1 10 -60 G = +1 VO = 2 VPP RL = 200 W VCM = 1.5 V -70 2nd-Harmonic -80 3rd-Harmonic -90 -100 100k 1M Frequency (Hz) Gain (V/V) Figure 9. Harmonic Distortion vs Inverting Gain -60 G = +1 VO = 2 VPP f = 1 MHz VCM = 1.5 V -70 Figure 10. Harmonic Distortion vs Frequency 10k Voltage Noise (nV/ÖHz), Current Noise (fA/ÖHz) Harmonic Distortion (dBc) -50 2nd-Harmonic -80 3rd-Harmonic -90 -100 1k Voltage Noise Current Noise 100 10 1 100 1k 10 100 RL (W) 1k 10k 100k 1M 10M 100M Frequency (Hz) Figure 11. Harmonic Distortion vs Load Resistance 8 10M Figure 12. Input Voltage and Current Noise Spectral Density vs Frequency Submit Documentation Feedback Copyright © 2002–2018, Texas Instruments Incorporated Product Folder Links: OPA357 OPA2357 OPA357, OPA2357 www.ti.com SBOS235F – MARCH 2002 – REVISED APRIL 2018 Typical Characteristics (continued) at TA = 25°C, VS = 5 V, G = +1, RF = 0 Ω, RL = 1 kΩ, and connected to VS / 2 (unless otherwise noted) 3 9 RL = 10 kW -3 -6 3 Normalized Gain (dB) Normalized Gain (dB) 0 G = +1 RF = 0 W VO = 0.1 VPP CL = 0 pF G = +1 VO = 0.1 VPP RS = 0 W 6 RL = 1 kW RL = 100 W -9 RL = 50 W -12 0 -3 CL = 47 pF -6 -9 CL = 5.6 pF -12 -15 100k 1M 10M Frequency (Hz) 100M -15 100k 1G Figure 13. Frequency Response for Various RL 3 For 0.1-dB Flatness 140 Normalized Gain (dB) 120 100 80 60 VIN RS VO OPA357 CL 1 kW 0 1k 10 100 Capacitive Load (pF) 100M 1G CL = 5.6 pF, RS = 0 W CL = 47 pF, RS = 140 W -3 CL = 100 pF, RS = 120 W -6 -9 VIN RS VO OPA357 CL -12 20 1 10M Frequency (Hz) G = +1 VO = 0.1 VPP 0 40 1M Figure 14. Frequency Response for Various CL 160 RS (W) CL = 100 pF -15 100k Figure 15. Recommended RS vs Capacitive Load 1M 1 kW 10M Frequency (Hz) 1G 100M Figure 16. Frequency Response vs Capacitive Load 100 180 160 Open-Loop Phase (Degrees) Open-Loop Gain (dB) CMRR CMRR, PSRR (dB) 80 PSRR+ 60 PSRR40 20 140 120 Phase 100 80 60 40 Gain 20 0 -20 0 -40 10k 100k 1M 10M Frequency (Hz) 100M 1G Figure 17. Common-Mode Rejection Ratio and PowerSupply Rejection Ratio vs Frequency 10 100 1k 10k 100k 1M Frequency (Hz) 10M 100M 1G Figure 18. Open-Loop Gain and Phase Submit Documentation Feedback Copyright © 2002–2018, Texas Instruments Incorporated Product Folder Links: OPA357 OPA2357 9 OPA357, OPA2357 SBOS235F – MARCH 2002 – REVISED APRIL 2018 www.ti.com Typical Characteristics (continued) at TA = 25°C, VS = 5 V, G = +1, RF = 0 Ω, RL = 1 kΩ, and connected to VS / 2 (unless otherwise noted) 0.8 10k Input Bias Current (pA) dG/dP (%/Degrees) 0.7 0.6 0.5 dP 0.4 0.3 0.2 0.1 1k 100 10 dG 1 0 1 2 3 Number of 150-W Loads 4 -55 Figure 19. Composite Video differential Gain and Phase -35 -15 5 25 45 65 Temperature (°C) 85 105 125 135 Figure 20. Input Bias Current vs Temperature 3 7 Supply Current (mA) Output Voltage (V) 6 2 +125°C +25°C -55°C 1 VS = 5 V 5 4 VS = 2.5 V 3 2 1 0 0 0 20 40 60 80 Output Current (mA) 100 120 -55 -35 -15 5 25 45 65 Temperature (°C) 85 105 125 135 VS = 3 V Figure 21. Output Voltage Swing vs Output Current Figure 22. Supply Current vs Temperature 5 4.5 VS = 5.5 V 4.0 Shutdown Current (mA) Output Voltage (V) 4 3 +125°C +25°C -55°C 2 1 3.5 3.0 VS = 5 V 2.5 2.0 1.5 1.0 0 VS = 2.5 V VS = 3 V 0.5 0 0 25 50 75 100 125 Output Current (mA) 150 175 200 -55 -35 -15 5 25 45 65 Temperature (°C) 85 105 125 135 VS = 5 V Figure 23. Output Voltage Swing vs Output Current 10 Figure 24. Shutdown Current vs Temperature Submit Documentation Feedback Copyright © 2002–2018, Texas Instruments Incorporated Product Folder Links: OPA357 OPA2357 OPA357, OPA2357 www.ti.com SBOS235F – MARCH 2002 – REVISED APRIL 2018 Typical Characteristics (continued) at TA = 25°C, VS = 5 V, G = +1, RF = 0 Ω, RL = 1 kΩ, and connected to VS / 2 (unless otherwise noted) 0 Output Impedance (W) -20 Feedthrough (dB) 100 VDISABLE = 0 RL = 10 W -40 -60 Forward Reverse -80 10 1 0.1 OPA357 -100 ZO -120 100k 1M 10M Frequency (Hz) 100M 0.01 100k 1G Figure 25. Disable Feedthrough vs Frequency 10M Frequency (Hz) 100M 1G Figure 26. Closed-Loop Output Impedance vs Frequency 6 0.5 VS = 5.5 V 0.4 5 4 VO = 2 VPP 0.3 Maximum Output Voltage Without Slew-Rate Induced Distortion Output Error (%) Output Voltage (VPP) 1M 3 VS = 2.7 V 2 0.2 0.1 0 -0.1 -0.2 -0.3 1 -0.4 0 -0.5 1 10 Frequency (MHz) 100 0 Figure 27. Maximum Output Voltage vs Frequency 10 20 30 40 50 60 Time (ns) 70 80 90 100 Figure 28. Output Settling Time to 0.1% 120 RL = 1 kW Population Open-Loop Gain (dB) 110 100 90 80 70 -55 -35 -15 5 25 45 65 Temperature (°C) 85 105 125 135 Figure 29. Open-Loop Gain vs Temperature -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 Offset Voltage (mV) 4 5 6 7 8 Figure 30. Offset Voltage Production Distribution Submit Documentation Feedback Copyright © 2002–2018, Texas Instruments Incorporated Product Folder Links: OPA357 OPA2357 11 OPA357, OPA2357 SBOS235F – MARCH 2002 – REVISED APRIL 2018 www.ti.com Typical Characteristics (continued) at TA = 25°C, VS = 5 V, G = +1, RF = 0 Ω, RL = 1 kΩ, and connected to VS / 2 (unless otherwise noted) 0 Crosstalk, Input-Referred (dB) 100 CMRR, PSRR (dB) 90 Common-Mode Rejection Ratio 80 Power-Supply Rejection Ratio 70 60 50 -55 -35 -15 5 25 45 65 Temperature (°C) 85 105 125 135 -40 -60 OPA2357 -80 -100 -120 100k 1M 10M 100M 1G Frequency (Hz) Figure 31. Common-Mode Rejection Ratio and PowerSupply Rejection Ratio vs Temperature 12 -20 Figure 32. Channel-to-Channel Crosstalk Submit Documentation Feedback Copyright © 2002–2018, Texas Instruments Incorporated Product Folder Links: OPA357 OPA2357 OPA357, OPA2357 www.ti.com SBOS235F – MARCH 2002 – REVISED APRIL 2018 7 Detailed Description 7.1 Overview The OPA357 is a CMOS, rail-to-rail I/O, high-speed, voltage-feedback operational amplifier designed for video, high-speed, and other applications. The device is available as a single or dual op amp. The amplifier features a 100-MHz gain bandwidth, and 150-V/µs slew rate, but is unity-gain stable and can be operated as a +1-V/V voltage follower. 7.2 Functional Block Diagram V+ Reference Current VIN+ VINVBIAS1 Class AB Control Circuitry VO VBIAS2 V(Ground) Submit Documentation Feedback Copyright © 2002–2018, Texas Instruments Incorporated Product Folder Links: OPA357 OPA2357 13 OPA357, OPA2357 SBOS235F – MARCH 2002 – REVISED APRIL 2018 www.ti.com 7.3 Feature Description 7.3.1 OPAx357 Comparison Table 1 lists several members of the device family that includes the OPAx357. Table 1. OPAx357 Related Products PART NUMBER FEATURED OPAx354 Non-shutdown version of OPA357 family OPAx355 200-MHz GBW, rail-to-rail output, CMOS, shutdown OPAx356 200-MHz GBW, rail-to-rail output, CMOS OPAx350, OPAx353 38-MHz GBW, rail-to-rail input/output, CMOS OPAx631 75-MHz BW G = 2, rail-to-rail output OPAx634 150-MHz BW G = 2, rail-to-rail output THS412x 100-MHz BW, differential input/output, 3.3-V supply 7.3.2 Operating Voltage The OPA357 is specified over a power-supply range of +2.7 V to +5.5 V (±1.35 V to ±2.75 V). However, the supply voltage can range from +2.5 V to +5.5 V (±1.25 V to ±2.75 V). Supply voltages higher than 7.5 V (absolute maximum) can permanently damage the amplifier. Parameters that vary over supply voltage or temperature are shown in the Typical Characteristics section. 7.3.3 Enable Function The OPA357 enable function is implemented using a Schmitt trigger. The amplifier is enabled by applying a TTL high voltage level (referenced to V−) to the Enable pin. Conversely, a TTL low voltage level (referenced to V−) disables the amplifier, reducing its supply current from 4.9 mA to only 3.4 µA per amplifier. Independent Enable pins are available for each channel (dual version), providing maximum design flexibility. For portable batteryoperated applications, this feature can be used to greatly reduce the average current and thereby extend battery life. The Enable input can be modeled as a CMOS input gate with a 100-kΩ pull-up resistor to V+. Connect this pin to a valid high or low voltage or driven, not left open circuit. The enable time is 100 ns and the disable time is only 30 ns. This time allows the OPA357 to be operated as a gated amplifier, or to have its output multiplexed onto a common output bus. When disabled, the output assumes a high-impedance state. 7.3.4 Rail-to-Rail Input The specified input common-mode voltage range of the OPA357 extends 100 mV beyond the supply rails. This range is achieved with a complementary input stage—an N-channel input differential pair in parallel with a Pchannel differential pair; see the Functional Block Diagram section. The N-channel pair is active for input voltages close to the positive rail, typically (V+) − 1.2 V to 100 mV above the positive supply, whereas the Pchannel pair is on for inputs from 100 mV below the negative supply to approximately (V+) − 1.2 V. There is a small transition region, typically (V+) − 1.5 V to (V+) − 0.9 V, in which both pairs are on. This 600-mV transition region can vary ±500 mV with process variation. Thus, the transition region (both input stages on) can range from (V+) − 2.0 V to (V+) − 1.5 V on the low end, up to (V+) − 0.9 V to (V+) − 0.4 V on the high end. A double-folded cascode adds the signal from the two input pairs and presents a differential signal to the class AB output stage. 7.3.5 Rail-to-Rail Output A class AB output stage with common-source transistors is used to achieve rail-to-rail output. For highimpedance loads (> 200 Ω), the output voltage swing is typically 100 mV from the supply rails. With 10-Ω loads, a useful output swing can be achieved while maintaining high open-loop gain; see Figure 21 and Figure 23. 14 Submit Documentation Feedback Copyright © 2002–2018, Texas Instruments Incorporated Product Folder Links: OPA357 OPA2357 OPA357, OPA2357 www.ti.com SBOS235F – MARCH 2002 – REVISED APRIL 2018 7.3.6 Output Drive The OPA357 output stage can supply a continuous output current of ±100 mA and still provide approximately 2.7 V of output swing on a 5-V supply, as shown in Figure 33. For maximum reliability, TI recommends running a continuous DC current in excess of ±100 mA; see Figure 21 and Figure 23. For supplying continuous output currents greater than ±100 mA, the OPA357 can be operated in parallel as shown in Figure 34. The OPA357 provides peak currents up to 200 mA, which corresponds to the typical short-circuit current. Therefore, an on-chip thermal shutdown circuit is provided to protect the OPA357 from dangerously high junction temperatures. At 160°C, the protection circuit shuts down the amplifier. Normal operation resumes when the junction temperature cools to below 140°C. R2 1 kW C1 50 pF + - V1 5V 1 mF R1 10 kW V+ OPA357 + R3 VIN 10 kW VRSHUNT R4 1 kW - 1-V In = 100-mA Out, as Shown Laser Diode Figure 33. Laser Diode Driver R2 10 kW C1 200 pF +5 V 1 mF R1 100 kW R5 = 1 W OPA2357 R3 100 kW + - 2-V In = 200-mA Out, as Shown R6 = 1 W RSHUNT 1W OPA2357 R4 10 kW Laser Diode Figure 34. Parallel Operation Submit Documentation Feedback Copyright © 2002–2018, Texas Instruments Incorporated Product Folder Links: OPA357 OPA2357 15 OPA357, OPA2357 SBOS235F – MARCH 2002 – REVISED APRIL 2018 www.ti.com 7.3.7 Video The OPA357 output stage is capable of driving standard back-terminated 75-Ω video cables, as shown in Figure 35. By back-terminating a transmission line, the cable does not exhibit a capacitive load to its driver. A properly back-terminated 75-Ω cable does not appear as capacitance; this cable presents only a 150-Ω resistive load to the OPA357 output. +5 V Video In 75 W OPA357 75 W +2.5 V Video Output To enable, connect to V+ or drive with logic. 604 W 604 W +2.5 V Figure 35. Single-Supply Video Line Driver The OPA357 can be used as an amplifier for RGB graphic signals, which have a voltage of zero at the video black level, by offsetting and AC-coupling the signal, as shown in Figure 36. 604 W +3 V + V+ Red 10 nF 604 W 75 W 1/2 OPA2357 R1 (1) 1 mF Red 75 W R2 V+ Green R1 (1) R2 604 W 75 W 1/2 OPA2357 Green 75 W 604W 604 W +3 V + V+ Blue (1) 1 mF 10 nF 604 W R1 75 W OPA357 Blue 75 W R2 (1) The source video signal offset is 300 mV above ground to accommodate the op amp swing-to-ground capability. Figure 36. RGB Cable Driver 16 Submit Documentation Feedback Copyright © 2002–2018, Texas Instruments Incorporated Product Folder Links: OPA357 OPA2357 OPA357, OPA2357 www.ti.com SBOS235F – MARCH 2002 – REVISED APRIL 2018 7.3.8 Wideband Video Multiplexing One common application for video speed amplifiers that include an Enable pin is to wire multiple amplifier outputs together, then select which one of several possible video inputs to source onto a single line. This simple wired-OR video multiplexer can be easily implemented using the OPA357, as shown in Figure 37. +2.5 V + 49.9 W Signal 1 1 mF 10 nF 1 mF 10 nF A OPA357 + -2.5 V 1 kW 49.9 W VOUT 1 kW 49.9 W +2.5 V + 49.9 W Signal 2 1 mF 10 nF 1 mF 10 nF B OPA357 + -2.5 V 1 kW 1 kW HCO4 BON Select AON Figure 37. Multiplexed Output Submit Documentation Feedback Copyright © 2002–2018, Texas Instruments Incorporated Product Folder Links: OPA357 OPA2357 17 OPA357, OPA2357 SBOS235F – MARCH 2002 – REVISED APRIL 2018 www.ti.com 7.3.9 Driving Analog-to-Digital Converters The OPA357 series op amps offer 60 ns of settling time to 0.01%, making the series a good choice for driving high- and medium-speed sampling A/D converters and reference circuits. The OPA357 series provides an effective means of buffering the A/D converter input capacitance and resulting charge injection while providing signal gain. Figure 38 shows the OPA357 driving an A/D converter. With the OPA357 in an inverting configuration, a capacitor across the feedback resistor can be used to filter high-frequency noise in the signal, as shown in Figure 38. +5 V 330 pF 5 kW 5 kW VIN V+ 5 kW ADS7818, ADS7861, or ADS7864 12-Bit A/D Converter +In OPA357 +2.5 V VREF 0.1 mF -In GND NOTE: A/D converter input = 0 V to VREF. NOTE: VIN = 0 V to –5 V for a 0-V to 5-V output. Figure 38. The OPA357 in Inverting Configuration Driving an A/D Converter 7.3.10 Capacitive Load and Stability The OPA357 series of op amps can drive a wide range of capacitive loads. However, all op amps under certain conditions may become unstable. Op amp configuration, gain, and load value are just a few factors to consider when determining stability. An op amp in unity-gain configuration is most susceptible to the effects of capacitive loading. The capacitive load reacts with the op amp output resistance, along with any additional load resistance, to create a pole in the small-signal response that degrades the phase margin; see Figure 14 for details. The OPA357 topology enhances its ability to drive capacitive loads. In unity gain, these op amps perform well with large capacitive loads. See Figure 15 for details. One method of improving capacitive load drive in the unity-gain configuration is to insert a 10-Ω to 20-Ω resistor in series with the output, as shown in Figure 39. This method significantly reduces ringing with large capacitive loads; see Figure 14. However, if there is a resistive load in parallel with the capacitive load, RS creates a voltage divider. This process introduces a DC error at the output and slightly reduces output swing. This error can be insignificant. For instance, with RL = 10 kΩ and RS = 20 Ω, there is only about a 0.2% error at the output. V+ RS VOUT OPA357 VIN RL CL To enable, connect to V+ or drive with logic. Figure 39. Series Resistor in Unity-Gain Configuration Improves Capacitive Load Drive 18 Submit Documentation Feedback Copyright © 2002–2018, Texas Instruments Incorporated Product Folder Links: OPA357 OPA2357 OPA357, OPA2357 www.ti.com SBOS235F – MARCH 2002 – REVISED APRIL 2018 7.3.11 Wideband Transimpedance Amplifier Wide bandwidth, low input bias current, and low input voltage and current noise make the OPA357 an ideal wideband photodiode transimpedance amplifier for low-voltage single-supply applications. Low-voltage noise is important because photodiode capacitance causes the effective noise gain of the circuit to increase at high frequency. The key elements to a transimpedance design, as shown in Figure 40, are the expected diode capacitance (including the parasitic input common-mode and differential-mode input capacitance (2 + 2)pF for the OPA357), the desired transimpedance gain (RF), and the gain bandwidth product (GBP) for the OPA357 (100 MHz). With these three variables set, the feedback capacitor value (CF) can be set to control the frequency response. CF
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