OPA855 - 8 GHz Gain Bandwidth Product, Decompensated Transimpedance Amplifier with Bipolar Input

The OPA855 is a wideband, low-noise operational amplifier withbipolar inputs forwideband transimpedance and voltage amplifier applications. When the device isconfigured as atransimpedance amplifier (TIA), the 8-GHzgain bandwidth product (GBWP) enables high closed-loop bandwidths attransimpedance gains of up to tens of kΩs.

The graph below shows the bandwidth and noise performance of theOPA855 as a function of the photodiode capacitance when the amplifier isconfigured as a TIA. Thetotal noise is calculated along a bandwidth range extending from dc to the calculated frequency, f,on the left-hand scale. The OPA855 package has a feedback pin (FB) thatsimplifies 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 theTDC7201. Use the OPA855 to drive a high-speed analog-to-digital converter (ADC) in high-resolution LIDARsystems with a differential output amplifier, such as theTHS4541 orLMH5401.

• 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 V_PP Total Output Swing
• Supply Voltage Range: 3.3 V to 5.25 V
• Quiescent Current: 17.8 mA
• Package: 8-Pin WSON
• Temperature Range: –40 to +125°C

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