TIDA-00978 Reference Design

Texas Instruments

Reference Design for Extending the OPA857 Transimpedance Bandwidth


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


Part Number Name Companion Part
OPA857 OPA857 Buy Datasheet

Bill Of Materials

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Test Data

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Other Documents

Title Updated Type Size (KB)
TIDA-00978 CAD Files 15 Aug 2016 ZIP 4080
TIDA-00978 Gerber 15 Aug 2016 ZIP 243
TIDA-00978 PCB 15 Aug 2016 PDF 781
TIDA-00978 Assembly Drawing 15 Aug 2016 PDF 178
TIDA-00978 BOM 15 Aug 2016 PDF 62
TIDA-00978 Schematic 15 Aug 2016 PDF 271