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Is it OK to apply different power supplies to the VCC pin and VREF pin?

Latest Updated:08/05/2009

Question:

(A/D Converter, Power Supply)
When using an A/D converter, is it OK to apply different power supplies to the VCC pin and VREF pin? [2009/08/05]

Answer:

Yes. It is possible when the recommended operating conditions below are guaranteed:

  • VREF ≦ VCC (within the recommended operating limits)
  • If an AVSS pin exists, connect the VSS pin and AVSS pin together.

In addition, when different power supplies are applied to the VCC pin and VREF pin, please connect a bypass capacitor between the VREF pin and AVSS (VSS) pin.

(#107428)

Suitable Products
3803H
3803L
3823
3850A
3858
38D2
38D5
7544
7546
7547