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AMC1311: Single sided output

PaulR
Prodigy 145 points
Part Number: AMC1311

We only need a single sided output from the AMC1311 to feed into an MCU ADC.

Is the TLC6001 amplifier really needed, or can I just feed one side of the AMC1311 to my MCU's ADC?

Anything I should be careful of?

Paul

  • 0
    TI__Guru 51111 points

    Hi Paul,

    Directly connecting the differential signal from the isolated amplifier to a differential ADC is the preferred way to interface as it allows for the most common-mode rejection, leading to the highest SNR measurement possible.

    Many MCU’s do not have differential inputs, only single ended. This is why a differential to single-ended conversion is necessary. There is an added benefit here of being able to gain or attenuate the signal such that it matches the maximum input range of the MCU, and filtering can be implemented.

    The last way this can be handled is as mentioned in your post, with the positive input being tied directly to the ADC with the negative input tied to GND through a weak resistor. This allows for direct connection to a single-ended MCU, but there is no filtering or matching of the full-scale range.  The negative input should not be tied directly to GND as it is a driven output. Connect the negative output to GND through a 10k resistor to limit the current and protect the device.