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OPA656

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Wideband, Unity Gain Stable FET-Input Operational Amplifier

Data sheet
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Wideband, Unity Gain Stable FET-Input Operational Amplifier

OPA656

ACTIVE
Data sheet Order now

Product details

Parameters

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) 500 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 open-in-new Find other High-speed op amps (GBW>=50MHz)

Package | Pins | Size

SOIC (D) 8 19 mm² 3.91 x 4.9 SOT-23 (DBV) 5 5 mm² 2.9 x 1.6 open-in-new Find other High-speed op amps (GBW>=50MHz)

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
 open-in-new Find other High-speed op amps (GBW>=50MHz)

Description

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.

 open-in-new Find other High-speed op amps (GBW>=50MHz)
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Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
NEW 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

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet OPA656 Wideband, Unity-Gain Stable, FET-Input Operational Amplifier datasheet (Rev. H) Sep. 29, 2015
Technical articles How to reduce distortion in high-voltage, high-frequency signal generation for AWGs Oct. 30, 2018
Technical articles What are the advantages of using JFET-input amplifiers in high-speed applications? Jun. 18, 2018
Technical articles Unique active mux capability combines buffer and switch into one solution Oct. 10, 2017
White papers The Signal e-book: A compendium of blog posts on op amp design topics Mar. 28, 2017
Technical articles How to minimize filter loss when you drive an ADC Oct. 20, 2016
User guides DEM-OPA-SO-1A User's Guide (Rev. B) Apr. 12, 2012
User guides DEM-OPA-SOT-1A User's Guide (Rev. B) Apr. 12, 2012
Application notes 1Q 2012 Issue Analog Applications Journal Jan. 31, 2012
Application notes Measuring op-amp settling time by using sample-and-hold technique Jan. 31, 2012
Application notes Transimpedance Considerations for High-Speed Operational Amplifiers Nov. 22, 2009
User guides Voltage-Controlled Amplifier Evaluation Kit Aug. 25, 2008
User guides DEM-OPA-SOT-1A User's Guide (Rev. A) Mar. 22, 2006
User guides DEM-OPA-SO-1A User's Guide (Rev. A) Mar. 16, 2006
Application notes Designing for low distortion with high-speed op amps Mar. 02, 2005
Application notes Noise Analysis for High Speed Op Amps (Rev. A) Jan. 17, 2005
Application notes Measuring Board Parasitics in High-Speed Analog Design Jul. 07, 2003
Application notes Voltage Feedback vs. Current Feedback Op Amps Nov. 30, 1998

Design & development

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Hardware development

EVALUATION BOARDS Download
document-generic User guide
5
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.

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EVALUATION BOARDS Download
document-generic User guide
5
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.

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Design tools & simulation

SIMULATION MODELS Download
SBOC120C.TSC (118 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SBOM136B.ZIP (60 KB) - PSpice Model
SIMULATION MODELS Download
SBOM195B.ZIP (13 KB) - TINA-TI Spice Model
SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
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 (...)
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
  • (...)
View details
SIMULATION TOOLS Download
SPICE-based analog simulation program
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 (...)
document-generic User guide
CALCULATION TOOLS Download
Analog engineer's calculator
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
  • (...)
View details
CALCULATION TOOLS Download
Voltage Divider Determines A Set of Resistors for a Voltage Divider
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.

(...)

Reference designs

REFERENCE DESIGNS Download
12-bit, 20-MSPS Data Acquisition Reference Design for Digitizer
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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Quad-Channel, 12-Bit, 50-MSPS ADC Reference Design With Low Noise, Low Distortion, DC and AC Inputs
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 (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
SOIC (D) 8 View options
SOT-23 (DBV) 5 View options

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