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OPA857EVM-978: 0 Volts at OUTN and OUT pin in both Test and APD mode.

Part Number: OPA857EVM-978
Other Parts Discussed in Thread: OPA857


I am getting 0 Volts at OUTN and OUTP pins in both the TEST and APD mode. Vcc is 3.3 Volts. Ideally, I should have got 1.83 V at the OUTN pin.



  • Hi Amar,

    I agree that you should have gotten 1.83V at the output. Did you measure 0V at the output of the OPA857 or at the output of the T1 transformer? The transformer will only output AC signals and it will have a DC output of 0V.

    Best regards,