TIDA-00978

Reference Design for Extending the OPA857 Transimpedance Bandwidth

TIDA-00978

Design files

Overview

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.

Features
  • 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

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUBX7.PDF (1207 K)

Reference design overview and verified performance test data

TIDRN70.PDF (271 K)

Detailed schematic diagram for design layout and components

TIDRN71.PDF (62 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRN72.PDF (178 K)

Detailed overview of design layout for component placement

TIDRN74.ZIP (4080 K)

Files used for 3D models or 2D drawings of IC components

TIDCCJ1.ZIP (243 K)

Design file that contains information on physical board layer of design PCB

TIDRN73.PDF (781 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Transimpedance amplifiers

OPA857Ultralow-Noise, Wideband, Pseudo-Differential Output Transimpedance Amplifier

Data sheet document-pdfAcrobat PDF open-in-new HTML

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Hardware

Evaluation board

OPA857EVM-978 — TIDUBX71_TIDA-00978A

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 (...)
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Technical documentation

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Type Title Date
* Design guide Extending Bandwith of the OPA857 Design Guide Jul. 25, 2016

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