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High-speed op amps (GBW ≥ 50 MHz)

OPA855

ACTIVE

8 GHz Gain Bandwidth Product, Decompensated Transimpedance Amplifier with Bipolar Input

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Data sheet

OPA855

ACTIVE
Data sheet Order now

Product details

Architecture Voltage FB Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 3.3 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 5.25 GBW (typ) (MHz) 8000 BW at Acl (MHz) 2500 Acl, min spec gain (V/V) 7 Slew rate (typ) (V/µs) 2750 Vn at flatband (typ) (nV√Hz) 0.98 Vn at 1 kHz (typ) (nV√Hz) 2.8 Iq per channel (typ) (mA) 17.8 Vos (offset voltage at 25°C) (max) (mV) 1.5 Rail-to-rail No Features Decompensated, Shutdown Rating Catalog Operating temperature range (°C) -40 to 125 CMRR (typ) (dB) 100 Input bias current (max) (pA) 5000000 Offset drift (typ) (µV/°C) 0.5 Iout (typ) (mA) 80 2nd harmonic (dBc) 90 3rd harmonic (dBc) 86 Frequency of harmonic distortion measurement (MHz) 10
Architecture Voltage FB Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 3.3 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 5.25 GBW (typ) (MHz) 8000 BW at Acl (MHz) 2500 Acl, min spec gain (V/V) 7 Slew rate (typ) (V/µs) 2750 Vn at flatband (typ) (nV√Hz) 0.98 Vn at 1 kHz (typ) (nV√Hz) 2.8 Iq per channel (typ) (mA) 17.8 Vos (offset voltage at 25°C) (max) (mV) 1.5 Rail-to-rail No Features Decompensated, Shutdown Rating Catalog Operating temperature range (°C) -40 to 125 CMRR (typ) (dB) 100 Input bias current (max) (pA) 5000000 Offset drift (typ) (µV/°C) 0.5 Iout (typ) (mA) 80 2nd harmonic (dBc) 90 3rd harmonic (dBc) 86 Frequency of harmonic distortion measurement (MHz) 10
DIESALE (Y) — See data sheet WSON (DSG) 8 4 mm² 2 x 2
  • High gain bandwidth product: 8GHz
  • Decompensated, gain ≥ 7V/V (stable)
  • Low input voltage noise: 0.98nV/√Hz
  • Slew rate: 2750V/µs
  • Low Input capacitance:
    • Common-mode: 0.6pF
    • Differential: 0.2pF
  • Wide input common-mode range:
    • 0.4V from positive supply
    • 1.1V from negative supply
  • 3VPP total output swing
  • Supply voltage range: 3.3V to 5.25V
  • Quiescent current: 17.8mA
  • Package: 8-pin WSON
    • Bare die
  • Temperature range: –40°C to +125°C
  • High gain bandwidth product: 8GHz
  • Decompensated, gain ≥ 7V/V (stable)
  • Low input voltage noise: 0.98nV/√Hz
  • Slew rate: 2750V/µs
  • Low Input capacitance:
    • Common-mode: 0.6pF
    • Differential: 0.2pF
  • Wide input common-mode range:
    • 0.4V from positive supply
    • 1.1V from negative supply
  • 3VPP total output swing
  • Supply voltage range: 3.3V to 5.25V
  • Quiescent current: 17.8mA
  • Package: 8-pin WSON
    • Bare die
  • Temperature range: –40°C to +125°C

The OPA855 is a wideband, low-noise operational amplifier with bipolar inputs for wideband transimpedance and voltage amplifier applications. When the device is configured as a transimpedance amplifier (TIA), the 8GHz gain bandwidth product (GBWP) enables high closed-loop bandwidths at transimpedance gains of up to tens of kilohms.

The following graph shows the bandwidth and noise performance of the OPA855 as a function of the photodiode capacitance when the amplifier is configured as a TIA. The total noise is calculated along a bandwidth range extending from dc to the calculated frequency (f) on the left scale. The OPA855 package has a feedback pin (FB) that simplifies the feedback network connection between the input and the output.

The OPA855 is optimized to operate in optical time-of-flight (ToF) systems where the OPA855 is used with time-to-digital converters, such as the TDC7201. Use the OPA855 to drive a high-speed analog-to-digital converter (ADC) in high-resolution LIDAR systems with a differential output amplifier, such as the THS4541 or LMH5401 devices.

The OPA855 is a wideband, low-noise operational amplifier with bipolar inputs for wideband transimpedance and voltage amplifier applications. When the device is configured as a transimpedance amplifier (TIA), the 8GHz gain bandwidth product (GBWP) enables high closed-loop bandwidths at transimpedance gains of up to tens of kilohms.

The following graph shows the bandwidth and noise performance of the OPA855 as a function of the photodiode capacitance when the amplifier is configured as a TIA. The total noise is calculated along a bandwidth range extending from dc to the calculated frequency (f) on the left scale. The OPA855 package has a feedback pin (FB) that simplifies the feedback network connection between the input and the output.

The OPA855 is optimized to operate in optical time-of-flight (ToF) systems where the OPA855 is used with time-to-digital converters, such as the TDC7201. Use the OPA855 to drive a high-speed analog-to-digital converter (ADC) in high-resolution LIDAR systems with a differential output amplifier, such as the THS4541 or LMH5401 devices.
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Technical documentation

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* Data sheet OPA855 8GHz Gain Bandwidth Product, Gain of 7V/V Stable, Bipolar Input Amplifier datasheet (Rev. D) PDF | HTML 01 May 2025
White paper 汽車光達簡介 (Rev. D) PDF | HTML 24 Apr 2025
White paper 차량용 LIDAR 소개 (Rev. D) PDF | HTML 24 Apr 2025
White paper An Introduction to Automotive LIDAR (Rev. D) PDF | HTML 16 Apr 2025
Circuit design Transimpedance amplifier circuit. (Rev. B) PDF | HTML 26 Sep 2024
Application brief LiFi: TI High-Speed Products for Optical Wireless Communication PDF | HTML 07 Aug 2023
Certificate OPA855DSGEVM EU Declaration of Conformity (DoC) 21 Jun 2023
Application brief Time of Flight and LIDAR - Optical Front End Design (Rev. A) PDF | HTML 29 Apr 2022
Application note High Speed ADCs and Amplifiers for Flow Cytometry Applications 12 Oct 2020
Technical article 3 common questions when designing with high-speed amplifiers PDF | HTML 17 Jul 2020
Analog Design Journal Maximizing the dynamic range of analog fronts ends having a transimpedance amp 14 Jun 2019
Analog Design Journal Easily improve the performance of analog circuits with decompensated amplifiers (Rev. A) 21 May 2019
Technical article What you need to know about transimpedance amplifiers – part 2 PDF | HTML 01 Sep 2016
Technical article What you need to know about transimpedance amplifiers – part 1 PDF | HTML 06 May 2016
Technical article SPICE it up: How to extract the input capacitance of an op amp (part 3) PDF | HTML 21 Mar 2016
Application note AN-1604 Decompensated Operational Amplifiers (Rev. B) 01 May 2013
Application note AN-1803 Design Considerations for a Transimpedance Amplifier (Rev. A) 01 May 2013
Application note Transimpedance Considerations for High-Speed Operational Amplifiers 22 Nov 2009
Application note Compensate Transimpedance Amplifiers Intuitively (Rev. A) 30 Mar 2005
Analog Design Journal Using a decompensated op amp for improved performance 11 Mar 2005
Application note Noise Analysis for High Speed Op Amps (Rev. A) 17 Jan 2005

Design & development

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Evaluation board

DEM-OPA-WSON8-EVM — Unpopulated evaluation module for single channel op-amps in the DSG (8-pin WSON) package

The DEM-OPA-WSON8-EVM is an unpopulated evaluation module for the single channel op-amps in the DSG (8-pin WSON) package. This EVM is designed to high-speed performance specifications and is compatible with amplifiers that have over 1 GHz of gain bandwidth.
User guide: PDF
Not available on TI.com
Evaluation board

OPA855DSGEVM — OPA855DSG Evaluation Module

The OPA855DSG EVM is an evaluation module for the single OPA855 in the DSG (8-pin WSON) package. The OPA855DSG EVM is designed to quickly demonstrate the functionality and versatility of the amplifier. The EVM is ready to connect to power, signal source, and test instruments through the use of (...)

User guide: PDF
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Simulation model

OPA855 TINA-TI Spice Model (Rev. C)

SBOMAP6C.TSC (1816 KB) - TINA-TI Spice Model
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Simulation model

OPA855 Unencrypted PSpice Model Package (Rev. D)

SBOMB43D.ZIP (37 KB) - PSpice Model
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Simulation model

OPA855 Unencrypted TINA-TI Reference Design Package (Rev. C)

SBOMAP7C.TSC (167 KB) - TINA-TI Reference Design
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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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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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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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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 (...)
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