OPA656

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

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User guide

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.

User guide

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 (...)

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Simulation tool

TINA-TI — SPICE-based analog simulation program

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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

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Reference designs

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Schematic

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