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. 4.2.2.1 T-Switch
        2. 4.2.2.2 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

3 Getting Started

The OPA928EVM is powered from a ±2.25-V to ±8-V dual supply. The high-impedance and transimpedance amplifier circuits have separate power-supply terminals located at terminal blocks J3 and J8, respectively. The TIA circuit has an additional terminal block (J7) requiring two independently-controlled 5-V channels to drive a T-switch that discharges the feedback loop (see Section 4.2.2.1). The EVM can be used without this function, in which case J7 can be ignored.