SBOU282A December   2022  – March 2023 OPA928


  1.   Abstract
  2.   Trademarks
  3. 1Read This First
    1. 1.1 EVM Cleanliness Guidelines
  4. 2Overview
    1. 2.1 Guarding and Shielding
  5. 3Getting Started
    1. 3.1 Related Documentation From Texas Instruments
    2. 3.2 Electrostatic Discharge Caution
  6. 4EVM Circuit Description
    1. 4.1 High-Impedance Amplifier Circuit
    2. 4.2 Transimpedance Amplifier Circuit
      1. 4.2.1 Configure the TIA
      2. 4.2.2 TIA Functions
        1. T-Switch
        2. Guarded Diode Limiter
  7. 5Cleaning the EVM
    1. 5.1 Ultrasonic Wash
    2. 5.2 Manual Cleaning Procedure
  8. 6Schematic, PCB Layout, and Bill of Materials
    1. 6.1 EVM Schematic
    2. 6.2 PCB Layout
    3. 6.3 Bill of Materials



This user’s guide describes the operation and use of the OPA928 evaluation module (EVM). The user's guide provides information on how to set up the EVM and describes different circuit configurations that can be used to evaluate the performance of the OPA928 femtoampere, input-bias-current op amp. Throughout this document, the terms evaluation board, evaluation module, and EVM are synonymous with the OPA928EVM. This document also includes an electrical schematic, simplified schematics of OPA928 applications circuits, a printed circuit board (PCB) layout drawing, and a parts list for the EVM.

Note: For best possible performance, make sure to review the Section 1.1 before handling the EVM board.