OPA857 Bandwidth Extension Evaluation Module


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The OPA857 is a wideband, ultralow noise transimpedance amplifier (TIA) targeted at photodiode monitoring applications. The OPA857 has two selectable gain configurations of 5kΩ and 20kΩ while maintaining a nearly constant closed-loop bandwidth in excess of 100MHz . In this reference design, external resistors are added in parallel with the internal resistors to take advantage of the high-speed amplifier core to extend the transimpedance bandwidth of the amplifier.

  • Extending the bandwidth of the OPA857 from 100MHz to greater than 250MHz
  • Adjusting the gain of the OPA857 between 1-20kΩ
  • Evaluation module allows flexibility in testing the OPA857 in internal test mode or with an external photodiode

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Technical Documents
User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 1207 25 Jul 2016 449

TI Devices (2)

Part Number Name Product Family
OPA857  Differential Output Transimpedance Amplifier  Operational Amplifiers (Op Amps) 
OPA857-DIE  Low-Noise, Wideband, Selectable-gain, Transimpedance Amp  Operational Amplifiers (Op Amps) 

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