Differential or single ended input to ADuc7061

Hello,

As described in the datasheet the ADuC7061 accept boths single-ended and differential signals.

I wonder, whether there are any differences _internal_ to the ADC whether a ADC is configured

for a differential or single ended input?

e.g. it is possible via ADC1CH[3:0] to select "ADC4/ADC5(differential mode)" or "ADC4/ADC5(single-ended mode)" - is there any difference?

Best Regards

Norman Werner

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  • 0
    •  Analog Employees 
    on Jul 20, 2012 8:22 PM

    The case that you give of ADC4/ADC5 will be used by ADC1 -

    Differential mode  should be selected for a bi-polar measurement. In this case you will need to set the common mode voltage to maybe 900mV (Bias ADC5 to 900mV).

    ADC5 input will be the negative input and ADC4 input voltage may swing above or below the voltage on ADC5.

    Single ended mode would be suggested for unipolar inputs - where ADC5 is set to 100mV and ADC4 input voltage will always be greater than 100mV.

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  • 0
    •  Analog Employees 
    on Jul 20, 2012 8:22 PM

    The case that you give of ADC4/ADC5 will be used by ADC1 -

    Differential mode  should be selected for a bi-polar measurement. In this case you will need to set the common mode voltage to maybe 900mV (Bias ADC5 to 900mV).

    ADC5 input will be the negative input and ADC4 input voltage may swing above or below the voltage on ADC5.

    Single ended mode would be suggested for unipolar inputs - where ADC5 is set to 100mV and ADC4 input voltage will always be greater than 100mV.

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