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High-speed op amps (GBW ≥ 50 MHz)

OPA656

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Wideband, Unity Gain Stable FET-Input Operational Amplifier

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Data sheet

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OPA814 ACTIVE 600-MHz, high-precision unity-gain-stable FET-input operational amplifier Wider bandwidth (BW) (250 MHz), lower noise (5.4 nV/rtHz) and higher precision voltage drift (3.5 uV/C)

OPA656

ACTIVE
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Product details

Architecture FET / CMOS Input, Voltage FB Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 8 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 12 GBW (typ) (MHz) 230 BW at Acl (MHz) 500 Acl, min spec gain (V/V) 1 Slew rate (typ) (V/µs) 290 Vn at flatband (typ) (nV√Hz) 7 Vn at 1 kHz (typ) (nV√Hz) 10 Iq per channel (typ) (mA) 14 Vos (offset voltage at 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) (µV/°C) 2 Iout (typ) (mA) 70 2nd harmonic (dBc) 71 3rd harmonic (dBc) 81 Frequency of harmonic distortion measurement (MHz) 5
Architecture FET / CMOS Input, Voltage FB Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 8 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 12 GBW (typ) (MHz) 230 BW at Acl (MHz) 500 Acl, min spec gain (V/V) 1 Slew rate (typ) (V/µs) 290 Vn at flatband (typ) (nV√Hz) 7 Vn at 1 kHz (typ) (nV√Hz) 10 Iq per channel (typ) (mA) 14 Vos (offset voltage at 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) (µV/°C) 2 Iout (typ) (mA) 70 2nd harmonic (dBc) 71 3rd harmonic (dBc) 81 Frequency of harmonic distortion measurement (MHz) 5
SOIC (D) 8 29.4 mm² 4.9 x 6 SOT-23 (DBV) 5 8.12 mm² 2.9 x 2.8
  • Wide bandwidth:
    • Gain-bandwidth product: 230MHz
    • Unity-gain bandwidth: 550MHz
    • Large-signal bandwidth (2VPP): 150MHz
  • High precision:
    • Input offset voltage: 600µV (maximum)
    • Input offset voltage drift: 6µV/°C (maximum)
  • Input voltage noise: 6nV/√Hz
  • Input bias current: 2pA
  • Low distortion (RL = 200Ω, VO = 2VPP):
    • HD2, HD3 at 5MHz: –80dBc, –100dBc
  • Supply range: 8V to 12V
  • Wide bandwidth:
    • Gain-bandwidth product: 230MHz
    • Unity-gain bandwidth: 550MHz
    • Large-signal bandwidth (2VPP): 150MHz
  • High precision:
    • Input offset voltage: 600µV (maximum)
    • Input offset voltage drift: 6µV/°C (maximum)
  • Input voltage noise: 6nV/√Hz
  • Input bias current: 2pA
  • Low distortion (RL = 200Ω, VO = 2VPP):
    • HD2, HD3 at 5MHz: –80dBc, –100dBc
  • Supply range: 8V to 12V

The OPA656 combines a wideband, unity-gain stable, voltage-feedback operational amplifier with a low-noise junction gate field-effect transistor (JFET) input stage to offer an ultra high dynamic-range amplifier for transimpedance applications and high-speed data acquisition front-ends. Extremely low dc errors give good precision in both optical applications and test and measurement.

The OPA656 features ultra-low input voltage noise (6nV/√Hz) to achieve a very low integrated noise in transimpedance applications. The combination of high input impedance and low input voltage noise makes the OPA656 an excellent wideband transimpedance amplifier in optical test and communication equipment, as well as medical and scientific instrumentation.

The OPA656 features a wide gain bandwidth of 230MHz. The large-signal bandwidth of 150MHz and low distortion make the OPA656 an excellent choice in high-speed digitizer front-ends, active probes, and other test and measurement front ends.

The OPA656 combines a wideband, unity-gain stable, voltage-feedback operational amplifier with a low-noise junction gate field-effect transistor (JFET) input stage to offer an ultra high dynamic-range amplifier for transimpedance applications and high-speed data acquisition front-ends. Extremely low dc errors give good precision in both optical applications and test and measurement.

The OPA656 features ultra-low input voltage noise (6nV/√Hz) to achieve a very low integrated noise in transimpedance applications. The combination of high input impedance and low input voltage noise makes the OPA656 an excellent wideband transimpedance amplifier in optical test and communication equipment, as well as medical and scientific instrumentation.

The OPA656 features a wide gain bandwidth of 230MHz. The large-signal bandwidth of 150MHz and low distortion make the OPA656 an excellent choice in high-speed digitizer front-ends, active probes, and other test and measurement front ends.

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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet OPA656 550MHz, Unity-Gain Stable, FET-Input Operational Amplifier datasheet (Rev. I) PDF | HTML 29 Feb 2024
Application brief Optimizing LCR Meter Front-End Design for Accurate Impedance Measurements PDF | HTML 20 Jan 2021
E-book The Signal e-book: A compendium of blog posts on op amp design topics 28 Mar 2017
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
Analog Design Journal 1Q 2012 Issue Analog Applications Journal 31 Jan 2012
Analog Design Journal 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
Analog Design Journal 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.

User guide: PDF
Not available on TI.com
Evaluation board

DEM-OPA-SOT-1A — Single operational amplifier evaluation module for SOT-23 5-pin and 6-pin packages

DEM-OPA-SOT-1A is a demonstration board that evaluates the operation and performance of high-speed, wide-bandwidth operational amplifiers. This unpopulated PC board is compatible with products offered in the small-outline transistor (SOT) DBV package.

User guide: PDF
Not available on TI.com
Simulation model

OPA656 PSpice Model (Rev. B)

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

OPA656 TINA-TI Reference Design (Rev. C)

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

OPA656 TINA-TI Spice Model (Rev. B)

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

ANALOG-ENGINEER-CALC — PC software 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 operational-amplifier (...)

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Calculation tool

VOLT-DIVIDER-CALC — Voltage divider calculation tool

The voltage divider calculation tool (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. VOLT-DIVIDER-CALC can also be used to (...)
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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

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 (...)
User guide: PDF
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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 (...)

Design guide: PDF
Schematic: PDF
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 (...)
Design guide: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
SOIC (D) 8 Ultra Librarian
SOT-23 (DBV) 5 Ultra Librarian
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