SBOU282A December 2022 – March 2023 OPA928
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.