A customer wants to use AD9280 under AD876 mode for the replacement.
When customer applied 1.5V to REFTF and GND to REFBF, he found a mid point of 2V.
that means that the mid point should be 0.75V (1.5/2 V), but he found that the MLB was changed when 2V is applied from Vin. The parts works as if the VREF FS would be 4V.
I have 2 questions;
1. Is the behavior my customer has seen the normal?
2. I think AD9280 seems to have a character like Fig 17 on AD876 DS. Does it have such a limitation?
Could you give me your advice?
Update: Discussion taken offline for further review per customer request.