Product details

Architecture FET / CMOS Input, Voltage FB Number of channels (#) 1 Total supply voltage (Min) (+5V=5, +/-5V=10) 8 Total supply voltage (Max) (+5V=5, +/-5V=10) 12 GBW (Typ) (MHz) 230 BW @ Acl (MHz) 500 Acl, min spec gain (V/V) 1 Slew rate (Typ) (V/us) 290 Vn at flatband (Typ) (nV/rtHz) 7 Vn at 1 kHz (Typ) (nV/rtHz) 10 Iq per channel (Typ) (mA) 14 Vos (offset voltage @ 25 C) (Max) (mV) 0.6 Rail-to-rail No Rating Catalog Operating temperature range (C) -40 to 85 CMRR (Typ) (dB) 86 Input bias current (Max) (pA) 5 Offset drift (Typ) (uV/C) 2 Output current (Typ) (mA) 70 2nd harmonic (dBc) 71 3rd harmonic (dBc) 81 @ MHz 5
Architecture FET / CMOS Input, Voltage FB Number of channels (#) 1 Total supply voltage (Min) (+5V=5, +/-5V=10) 8 Total supply voltage (Max) (+5V=5, +/-5V=10) 12 GBW (Typ) (MHz) 230 BW @ Acl (MHz) 500 Acl, min spec gain (V/V) 1 Slew rate (Typ) (V/us) 290 Vn at flatband (Typ) (nV/rtHz) 7 Vn at 1 kHz (Typ) (nV/rtHz) 10 Iq per channel (Typ) (mA) 14 Vos (offset voltage @ 25 C) (Max) (mV) 0.6 Rail-to-rail No Rating Catalog Operating temperature range (C) -40 to 85 CMRR (Typ) (dB) 86 Input bias current (Max) (pA) 5 Offset drift (Typ) (uV/C) 2 Output current (Typ) (mA) 70 2nd harmonic (dBc) 71 3rd harmonic (dBc) 81 @ MHz 5
SOIC (D) 8 SOT-23 (DBV) 5 5 mm² 2.9 x 1.6
  • 500 MHz Unity-gain Bandwidth
  • Low Input Bias Current: 2 pA
  • Low Offset And Drift: ±250 µV, ±2 µV/°C
  • Low Distortion: 74-dB SFDR at 5 MHz
  • High-Output Current: 70 mA
  • Low Input Voltage Noise: 7 nV/√Hz
  • 500 MHz Unity-gain Bandwidth
  • Low Input Bias Current: 2 pA
  • Low Offset And Drift: ±250 µV, ±2 µV/°C
  • Low Distortion: 74-dB SFDR at 5 MHz
  • High-Output Current: 70 mA
  • Low Input Voltage Noise: 7 nV/√Hz

The OPA656 device combines a very wideband, unity-gain stable, voltage-feedback operational amplifier with a FET-input stage to offer an ultra high dynamic-range amplifier for Analog-to-Digital Converter (ADC) buffering and transimpedance applications. Extremely low DC errors give good precision in optical applications.

The high unity-gain stable bandwidth and JFET input allows exceptional performance in high-speed, low-noise integrators.

The high input impedance and low bias current provided by the FET input is supported by the ultra-low 7-nV/√Hz input voltage noise to achieve a very low integrated noise in wideband photodiode transimpedance applications.

Broad transimpedance bandwidths are achievable given the OPA656 device’s high 230-MHz gain bandwidth product. As shown below, a –3-dB bandwidth of 1 MHz is provided even for a high 1-MΩ transimpedance gain from a 47-pF source capacitance.

The OPA656 device combines a very wideband, unity-gain stable, voltage-feedback operational amplifier with a FET-input stage to offer an ultra high dynamic-range amplifier for Analog-to-Digital Converter (ADC) buffering and transimpedance applications. Extremely low DC errors give good precision in optical applications.

The high unity-gain stable bandwidth and JFET input allows exceptional performance in high-speed, low-noise integrators.

The high input impedance and low bias current provided by the FET input is supported by the ultra-low 7-nV/√Hz input voltage noise to achieve a very low integrated noise in wideband photodiode transimpedance applications.

Broad transimpedance bandwidths are achievable given the OPA656 device’s high 230-MHz gain bandwidth product. As shown below, a –3-dB bandwidth of 1 MHz is provided even for a high 1-MΩ transimpedance gain from a 47-pF source capacitance.

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Technical documentation

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Type Title Date
* Data sheet OPA656 Wideband, Unity-Gain Stable, FET-Input Operational Amplifier datasheet (Rev. H) 29 Sep 2015
Application note Optimizing LCR Meter Front-End Design for Accurate Impedance Measurements 20 Jan 2021
Technical article How to reduce distortion in high-voltage, high-frequency signal generation for AWGs 30 Oct 2018
Technical article What are the advantages of using JFET-input amplifiers in high-speed applications? 19 Jun 2018
Technical article Unique active mux capability combines buffer and switch into one solution 10 Oct 2017
E-book The Signal e-book: A compendium of blog posts on op amp design topics 28 Mar 2017
Technical article How to minimize filter loss when you drive an ADC 20 Oct 2016
User guide DEM-OPA-SO-1A User's Guide (Rev. B) 12 Apr 2012
User guide DEM-OPA-SOT-1A User's Guide (Rev. B) 12 Apr 2012
Application note 1Q 2012 Issue Analog Applications Journal 31 Jan 2012
Application note Measuring op-amp settling time by using sample-and-hold technique 31 Jan 2012
Application note Transimpedance Considerations for High-Speed Operational Amplifiers 22 Nov 2009
User guide Voltage-Controlled Amplifier Evaluation Kit 25 Aug 2008
User guide DEM-OPA-SOT-1A User's Guide (Rev. A) 22 Mar 2006
User guide DEM-OPA-SO-1A User's Guide (Rev. A) 16 Mar 2006
Application note Designing for low distortion with high-speed op amps 02 Mar 2005
Application note Noise Analysis for High Speed Op Amps (Rev. A) 17 Jan 2005
Application note Measuring Board Parasitics in High-Speed Analog Design 07 Jul 2003
Application note Voltage Feedback vs. Current Feedback Op Amps 30 Nov 1998

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

DEM-OPA-SO-1A — Single op-amp evaluation module for SO-8 package

The DEM-OPA-SO-1A demonstration fixture helps designers evaluate the operation and performance of TI's High Speed, Wide Bandwidth Operational Amplifiers. This unpopulated PC board is compatible with products offered in the 8-lead SOIC (D) package.

In stock
Limit: 5
Evaluation board

DEM-OPA-SOT-1A — Single op amp evaluation module for SOT23-5/6 package

The DEM-OPA-SOT-1A is a demonstration fixture that helps designers evaluate the operation and performance of TI's High Speed, Wide Bandwidth Operational Amplifiers. This unpopulated PC board is compatible with products offered in the SOT(DBV) package.

In stock
Limit: 5
Simulation model

OPA656 TINA-TI Reference Design (Rev. C)

SBOC120C.TSC (118 KB) - TINA-TI Reference Design
Simulation model

OPA656 PSpice Model (Rev. B)

SBOM136B.ZIP (60 KB) - PSpice Model
Simulation model

OPA656 TINA-TI Spice Model (Rev. B)

SBOM195B.ZIP (13 KB) - TINA-TI Spice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
Calculation tool

ANALOG-ENGINEER-CALC — Analog engineer's calculator

The Analog Engineer’s Calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting op-amp gain with feedback (...)
Calculation tool

VOLT-DIVIDER-CALC — Voltage Divider Determines A Set of Resistors for a Voltage Divider

VOLT-DIVIDER-CALC quickly determines a set of resistors for a voltage divider. This KnowledgeBase Javascript utility can be used to find a set of resistors for a voltage divider to achieve the desired output voltage. This calculator can also be used to design non-inverting attentuation circuits.

(...)

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Reference designs

TIDA-00942 — 12-bit, 20-MSPS Data Acquisition Reference Design for Digitizer

This reference design enables a cost-effective and low-power data acquisition system that provides an alternative to FPGA-based systems. It features a single-ended, high-impedance input that can be used in a wide number of applications, including portable instrumentation and digitizers.

The reference (...)

Reference designs

TIDA-00799 — Quad-Channel, 12-Bit, 50-MSPS ADC Reference Design With Low Noise, Low Distortion, DC and AC Inputs

This reference design demonstrates how to implement a single-ended-to-differential input path, which can be AC-coupled or DC-coupled for an ADC3422. It also explains how to design a high-input impedance, DC-coupled input path. The reference design can be used for applications such as low-power data (...)
Package Pins Download
SOIC (D) 8 View options
SOT-23 (DBV) 5 View options

Ordering & quality

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