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AD717x, external C is required when Internal REF is enable

Question asked by ahata Employee on Jul 6, 2015
Latest reply on Jul 16, 2015 by ahata

Hi,

 

I have a question about AD717x.

When AD717x works with the internal REF and REFBUF are enable, Does C is required on REF+ and REF-?

 

Typical connection on AD7175 DS (Fig 44) has 4.7uF, 0.1uF and another 0.1uF (Cdiff) is on REF+ and REF-.

But I think when REFBUF is enable, REF+ and REF- should be Hi-Z, so users don't need to care about C and REF+/- should be open.

 

Is my understanding correct?

Could you give me your advice?

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