Re: AD9257 Processing of the VCM pin

Hello Dougl,

When I power down the VCM pin by Register 0x102;

1.  We don't need continue to decouple-to-ground with a 0.1uF capacitor. Is this correct?

2.  1.1V is connected to the VCM pin now. Does this cause that cause problems?

3.  It is written with Common-mode Range = 0.5V - 1.3V in the data sheet.

     When common-mode voltage is 1.1V, we enter analog input signal with an amplitude of 0.6V-1.6V.  Does this 

     reduce the performance of the ADC? (because it is not within the common mode range)

Thanks,

Tak