AnsweredAssumed Answered

AD9280 REF range under AD876 mode

Question asked by ahata Employee on Jun 9, 2016
Latest reply on Jun 14, 2016 by TonyM


Hi,

 

A customer wants to use AD9280 under AD876 mode for the replacement.

  • REFTF - REFTS: short
  • REFBF - REFBS: short
  • MODE = AGND

 

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?

 

 

Best regards,

Akihiko Hata

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