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AMC1311: Connect AMC1311 to single-ended ADC

Yangbo
Intellectual 1690 points
Part Number: AMC1311


Hi expert,

I am trying to use AMC1311 to measure 48V battery voltage. In the datasheet, it recommend to use an amplifier to connect AMC1311 to single-ended input ADC. In my application, ADC is single ended, but i don’t want to use the amplifier before ADC due to limited PCB area. Thus, I am wondering if it is ok to connected VOUTP directly to ADC and use VOUTP-1.4V(common mode voltage) as the output result. If so, I want to know how to deal with VOUNT pin. Can I leave it float?

Though we can get rid of the amplifier in this way, it will introduce extra error due to the variation of common mode voltage. This makes it fail to meet 1% accuracy requirement. Thus, i am thinking of using to ADC to read VOUTP and VOUTN simultaneously and do the math in DSP. In this way, we can eliminate the error caused by common mode voltage, Please let me know your thought.

Regards,

Yangbo

  • 0
    Guru 140200 points

    Hi Yangbo,

    not only that the common voltage shows changes with temperature and supply voltage, but the balanced signalling of AMC1311 is also crucial for achieving a proper common mode rejection between input and output side of AMC1311 and for suppressing the isolation channel signal transmission noise. So, abandoning the balanced signalling cannot be recommended at all!

    Kai