OPA858 Gain Bandwidth Product (GBWP) FET Input Amp

By Texas Instruments 159

OPA858 Gain Bandwidth Product (GBWP) FET Input Amp

Texas Instruments' OPA858 is a wideband, low-noise op-amp with CMOS inputs for wideband transimpedance and voltage amplifier applications. When the device is configured as a transimpedance amplifier (TIA), the 5.5 GHz GBWP enables applications requiring high closed-loop bandwidths at transimpedance gains in the tens to hundreds of kΩs range.

The OPA858 can be a function of the photodiode capacitance when the amplifier is configured as a TIA. The total noise is calculated over a bandwidth range extending from DC to the calculated f-3 dB frequency. The device package features a feedback pin (FB) that simplifies the feedback network connection between the input and the output.

The OPA858 is optimized for use in optical ToF systems when used with a time-to-digital converter. The OPA858 can be used in high-resolution LIDAR systems with a high-speed analog-to-digital converter (ADC) and a differential output amplifier to drive the ADC.

  • High GBWP: 5.5 GHz
  • Decompensated, gain ≥ 7 V/V (stable)
  • Ultra-low bias current MOSFET inputs: 10 pA
  • Low input voltage noise: 2.5 nV/√Hz
  • Slew rate: 2000 V/µs
  • 2.5 VPP output swing in TIA configuration
  • Supply voltage range: 3.3 V to 5.25 V
  • Quiescent current: 20.5 mA
  • Low input capacitance:
    • Common-mode: 0.6 pF
    • Differential: 0.2 pF
  • Wide input common-mode range:
    • 1.4 V from positive supply
    • Includes negative supply
  • Available in 8-pin WSON package
  • Temperature range: -40°C to +125°C
  • High-speed transimpedance amplifiers
  • Laser distance measurements
  • Lidar receivers
  • Level transmitters (optical)
  • Optical time domain reflectometry (OTDR)
  • Distributed temperature sensing
  • 3D scanners
  • ToF systems
  • Autonomous driving systems

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