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 ?