Hi
Looking through the datasheet of the AD9625 ADC, could you clarify if the device can be DC coupled? there are opposing statements in the PDF.
Page 19
The input stage contains a differential sampling circuit that can
be ac- or dc-coupled in differential or single-ended modes
Page 23
The AD9625 cannot operate correctly by dc coupling the analog
inputs, VIN±. It is recommended that the analog inputs are
ac-coupled around a common-mode voltage, VCM, using a
front-end network, as shown in Figure 36.
Thanks
Lee