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AURIX™ MCU: Using different voltage references for VADC and DSADC – KBA234900

AURIX™ MCU: Using different voltage references for VADC and DSADC – KBA234900

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AURIX™ MCU: Using different voltage references for VADC and DSADC – KBA234900

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Question: Is it possible to power the ADC module (VDDM) with 5 V and then use different voltage references for the VADC and the DSADC (e.g. VAREF2 to 5 V and VAREF1 to 2.5 V respectively) modules?

Answer:
It is possible to have different voltage references for the delta-sigma and the successive approximations for analog-to-digital converters. Ensure to connect all the grounds, analog and digital (VSSM, VAGND1, VAGND2 and GND) to the same ground plane.

Note: This KBA applies to the following series of AURIX™ MCUs:

  • AURIX™ TC2xx series
  • AURIX™ TC3xx series



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