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interface to input common mode voltage of AD9644

Question asked by r.traylor on Aug 22, 2012
Latest reply on Sep 6, 2012 by r.traylor

I have a project where I am using the AD9644 and I must remain DC coupled from input to the ADC.

I must also have gain control and have initially picked the AD8366 for its DC coupled capability. 

 

The problem I'm having is that VCM for the AD9644 is 0.9 volts but I cannot find a suitable amplifier

that will allow me to set its VCM output at 0.9V.  Is it possible to run a ADA4937 off split supply rails and

steer its output to make it compatible with the AD9644?  I'd rather do this with the AD8366 but it does

not look like it will support split supplies at all.

 

Thanks.

R. Traylor

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