OPA859 - 1.8 GHz Unity-Gain Bandwidth, 3.3 nV/√Hz, FET Input Amplifier

The OPA859 is a wideband, low-noise operational amplifier withCMOS inputs forwideband transimpedance and voltage amplifier applications. When the device isconfigured as atransimpedance amplifier (TIA), the 0.9-GHzgain bandwidth product (GBWP) enables high closed-loop bandwidths in low-capacitance photodiodeapplications.

The graph below shows the bandwidth and noise performance of theOPA859 as a function of the photodiode capacitance when the amplifier is setas a TIA. The total noise is calculated along a bandwidth range extending from dc to the calculatedfrequency, f, on the left-hand scale. The OPA859 package has a feedback pin(FB) that simplifies the feedback network connection between the input and the output.

The OPA859 is optimized to operate in optical time-of-flight (ToF)systems where the OPA859 is used with time-to-digital converters, such as theTDC7201. Use the OPA859 to drive a high-speed analog-to-digital converter (ADC) in high-resolution LIDARsystems with a differential output amplifier, such as theTHS4541 orLMH5401.

• High Unity-Gain Bandwidth: 1.8 GHz
• Gain Bandwidth Product: 900 MHz
• Ultra-Low Bias Current MOSFET Inputs: 10 pA
• Low Input Voltage Noise: 3.3 nV/√Hz
• Slew Rate: 1150 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
• Package: 8-Pin WSON
• Temperature Range: –40 to +125°C

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