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Texas Instruments OPA855 Decompensated Transimpedance Amplifiers



Texas Instruments OPA855 Decompensated Transimpedance Amplifiers

Texas Instruments OPA855 Decompensated Transimpedance Amplifiers provide a wideband and low-noise with bipolar inputs ideal for wideband transimpedance and voltage amplifier applications. The OPA855 can be configured as a transimpedance amplifier (TIA). When used as a TIA, the 8GHz gain bandwidth product (GBWP) enables high closed-loop bandwidths at transimpedance gains of up to tens of kΩs.

The device operates in optical time-of-flight (ToF) systems where the OPA855 is used with time-to-digital converters. The TDC7201, a Time-to-Digital Converter is such a device. The OPA855 can drive a high-speed analog-to-digital converter (ADC) in high-resolution LIDAR systems when using a differential output amplifier like the THS4541 or LMH5401.


  • High Gain Bandwidth Product: 8GHz

  • Decompensated, Gain ≥ 7V/V (Stable)

  • Low Input Voltage Noise: 0.98nV/√Hz

  • Slew Rate: 2750V/µs

  • 3VPP Total Output Swing

  • Supply Voltage Range: 3.3V to 5.25V

  • Quiescent Current: 17.8mA

  • Package: 8-Pin WSON

  • Temperature Range: –40 to +125°C

  • 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


  • High-Speed Transimpedance Amplifier

  • Laser Distance Measurement

  • CCD Output Buffer

  • High-Speed Buffer

  • Optical Time Domain Reflectometry (OTDR)

  • High-Speed Active Filter

  • 3D Scanner

  • Silicon Photomultiplier (SiPM) Buffer Amplifier

  • Photomultiplier Tube Post Amplifier