OPA656

Package | Pins | Size

SOIC (D)

19 mm² 3.91 x 4.9

SOT-23 (DBV)

5 mm² 2.9 x 1.6

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Features

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

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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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Single op-amp SO-8 generic evaulation module

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Similar products you might be interested in

Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:

OPA818

ACTIVE

2.7-GHz, 13-V, decompensated 7-V/V, FET-input operational amplifier This device has lower noise (2.2 nV/rtHz) and higher gain-bandwidth (2.7 GHz)

Technical documentation

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

Design & development

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

Hardware development

EVALUATION BOARD Download

DEM-OPA-SO-1A

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Description

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.

Single op-amp SOT23-5/6 generic evaulation module

EVALUATION BOARD Download

DEM-OPA-SOT-1A

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Description

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.

OPA656 TINA-TI Reference Design (Rev. C)

Design tools & simulation

SIMULATION MODEL Download

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

OPA656 PSpice Model (Rev. B)

SIMULATION MODEL Download

SBOM136B.ZIP (60 KB) - PSpice Model

OPA656 TINA-TI Spice Model (Rev. B)

SIMULATION MODEL Download

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

PSpice® for TI design and simulation tool

SIMULATION TOOL Download

PSPICE-FOR-TI — 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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Features

Leverages Cadence PSpice Technology
Preinstalled library with a suite of digital models to enable worst-case timing analysis
Dynamic updates ensure you have access to most current device models
Optimized for simulation speed without loss of accuracy
Supports simultaneous analysis of multiple products
(...)

SPICE-based analog simulation program

SIMULATION TOOL Download

TINA-TI — 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 (...)

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View options

Analog engineer's calculator

CALCULATION TOOL Download

ANALOG-ENGINEER-CALC — 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 (...)

Features

Expedites circuit design with analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
- Noise calculations
- Common unit translation
Solves common amplifier circuit design problems
- Gain selections using standard resistors
- Filter configurations
- Total noise for common amplifier configurations
(...)

Voltage Divider Determines A Set of Resistors for a Voltage Divider

CALCULATION TOOL Download

VOLT-DIVIDER-CALC — 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.

(...)

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

Reference designs

REFERENCE DESIGNS Download

TIDA-00942 — 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 (...)

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Schematic

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Design files

download TIDA-00942 BOM.pdf (253KB)
download TIDA-00942 Assembly Drawing.pdf (52KB)
download TIDA-00942 PCB.pdf (722KB)
download TIDA-00942 CAD Files.zip (1511KB)
download TIDA-00942 Gerber.zip (175KB)

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

REFERENCE DESIGNS Download

TIDA-00799 — 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 (...)

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Schematic

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