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AD8556 input voltage range / supply voltage

Question asked by tcachat on May 22, 2012
Latest reply on May 25, 2012 by tcachat

Dear All,


We have designed and assembled two different boards with the AD8556. According to the data sheet (page 4 specifications and page 18 "shorted wire fault detection"), both inputs must be between 2 and 3V with VDD=5V. But we have VDD=3.3V because DIGIN is driven by an FPGA (we do not have logical devices under 5 V any more). In that case (VDD=3.3V), what are the thresholds VINH and VINL? I assume proportionality 1.32 and 1.98V. Is it correct?


We used the revision 0 of the data sheet. I just discovered the revision A, where it is simply stated that VDD must be between 4.5 and 5.5V. Previously it was 2.7V to 5.5V.


Thank you in advance