OPA858 - 5.5 GHz Gain Bandwidth Product, Decompensated Transimpedance Amplifier with FET Input

The OPA858 is a wideband, low-noise, operational amplifier withCMOS inputs forwideband transimpedance and voltage amplifier applications. When the device is configured as atransimpedance amplifier (TIA), the 5.5-GHzgain bandwidth product (GBWP) enables applications requiring highclosed-loop bandwidths at transimpedance gains in the tens to hundreds of kΩs range.

The graph below demonstrates the bandwidth and noise performance of theOPA858 as a function of the photodiode capacitance when the amplifier isconfigured as a TIA. The total noise is calculated over a bandwidth range extending from DC to thecalculated f_-3dB frequency on the left-hand scale. TheOPA858 package features a feedback pin (FB) that simplifies the feedbacknetwork connection between the input and the output.

The OPA858 is optimized for use in optical Time-of-Flight (ToF)systems like the one shown in the figure below where the OPA858 is used withthe TDC7201 time-to-digital converter. TheOPA858 can be used in high-resolution LIDAR systems with a high-speedanalog-to-digital converter (ADC) and a differential output amplifier like theTHS4541 or LMH5401 to drive the ADC.

• High Gain Bandwidth Product: 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
• 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
• 2.5 V_PP Output Swing in TIA Configuration
• Supply Voltage Range: 3.3 V to 5.25 V
• Quiescent Current: 20.5 mA
• Available in 8-Pin WSON Package
• Temperature Range: –40 to +125°C

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