Texas Instruments introduces 8-GHz Gain Bandwidth Product, Gain of 7-V/V Stable, Bipolar Input Amplifier

Texas Instruments OPA855-Q1

Texas Instruments (TI) introduced the wideband, low-noise operational amplifier OPA855-Q1 with bipolar inputs for wideband transimpedance and voltage amplifier applications. When the device is configured as a transimpedance amplifier (TIA), the 8-GHz gain bandwidth product (GBWP) enables high closed-loop bandwidths at transimpedance gains of up to tens of kΩs.

Texas Instruments - OPA855-Q1

The graph below shows the bandwidth and noise performance of the OPA855-Q1 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-Q1 package has a feedback pin (FB) that simplifies the feedback network connection between the input and the output.

Photodiode Capacitance vs Bandwidth and Noise
Photodiode Capacitance vs Bandwidth and Noise.

The OPA855-Q1 is optimized to operate in optical time-of-flight (ToF) systems where the OPA855-Q1 is used with time-to-digital converters, such as the TDC7201. Use the OPA855-Q1 to drive a high-speed analog-to-digital converter (ADC) in high-resolution LIDAR systems with a differential output amplifier, such as the THS4541-Q1.


  • AEC-Q100 Qualified for Automotive Applications:
  • High Gain Bandwidth Product: 8 GHz
  • Decompensated, Gain ≥ 7 V/V (Stable)
  • Low Input Voltage Noise: 0.98 nV/√Hz
  • Slew Rate: 2750 V/μs
  • Low Input Capacitance:
    • Common-Mode: 0.6 pF
    • Differential: 0.2 pF
  • Wide Input Common-Mode Range:
    • 0.4 V from Positive Supply
    • 1.1 V from Negative Supply
  • 3 VPP Total Output Swing
  • Supply Voltage Range: 3.3 V to 5.25 V
  • Quiescent Current: 17.8 mA
  • Package: 8-Pin WSON 2.00 mm × 2.00 mm
  • Temperature Range: –40 °C to +125 °C


  • Automotive LIDAR
  • Time-of-Flight (ToF) Camera
  • Optical Time Domain Reflectometry (OTDR)
  • 3D Scanner
  • Laser Distance Measurement
  • Solid-State Scanning LIDAR
  • Optical ToF Position Sensor
  • Drone Vision
  • Silicon Photomultiplier (SiPM) Buffer Amplifier
  • Photomultiplier Tube Post Amplifier
The OPA855DSGEVM Evaluation Module for the OPA855
The OPA855DSGEVM Evaluation Module for the OPA855.

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