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What is usage difference of VAREF input and output in ADC?

What is usage difference of VAREF input and output in ADC?

gou
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Schematic of ADC1 and VAREF pin information in TLE987x Datasheet

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  • VAREF can be used as both, input or output.
  • To set as input: to use an external reference voltage generator, for example to perform ratiometric measurements.
  • To set as output: to use an internal reference voltage generator, and it is necessary to connect the external bypass capacitance.

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