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AD9237-40 mode2 pin threshold

Question asked by Terumasa on Sep 11, 2014
Latest reply on Sep 20, 2017 by DougI



Please let me know about the threshold of mode pin in AD9237-40.


Datasheet  P.20 describes below but does not describe threhold.


Mode2     ;  Span ; Power scaling

AVDD          ;   1; Disabled

2/3 AVDD    ;   1; Enabled

1/3 AVDD    ;   2 ;Enabled

AGND          ; 2  ;Disabled


We would like to use Span factor 1 and power scaling enable.

But, board space is too short and it is difficult to make 2/3 AVDD from AVDD(3.3V).

So, if possible, we would like to supply 2.5V (another power rail)  to MODE2 pin.

As the result of our test,  Span factor 1 and power scaling enable is set by voltage less than 2.6V.

Could you give me your advice if there is any problem ?