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AD7176-2 split rail decoupling question

Question asked by bt@g5 on Sep 26, 2014
Latest reply on Sep 28, 2014 by jtee

Using 2.5V for AVDD1 and  -2.5V for AVSS

!: Do REF+ and - pins need to be decoupled to AVSS or AGND.?

2. Should an input amplifier ref be AGND or AVSS? (Its rails will either be +/-5V or +/-2.5V)

3. Should RCAPA pin be decoupled to AGND or AVSS?

 

4.I'm using precision external references for REF+ and REF- (2.5V and -2.5V),

and my input is a single-ended bipolar. Would I be able to use the internal reference, if selected, and still have +/-FS from -2.5 to 2.5V?@

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