Other Parts Discussed in Thread: TLV6001,
Customer would like to adapt below circuitry, but could you explain why the Common voltage VCMADC connects to positive terminal of the TLV6001 via R & C? Thanks.
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Hi Brian,
the TLV6001 works as a simple differential amplifier here. It removes the common mode output voltage of AMC1311 and converts the differential output signal of AMC1311 into a non differential signal. Remember that both output signals of AMC1311 (VOUTN and VOUTP) sit on a 1.44V common mode voltage to allow output signals of both polarities. That's why a differential amplifier is needed.
But then, the converted output signal (output signal of TLV6001) must be shifted to the common mode voltage of ADC, again to allow signals of both polarities. That's why the terminal labeled with "VCMADC" isn't connected to signal ground as it is usually done with a differential amplifier but to the common mode voltage of ADC (VCMADC).
Kai