The AD9642 maximum Input offset is stated to be 11mV in data sheet rev 0. This is equivalent to approx 103 bits. However the maximum offset correction range provided via the SPI interface is ± 32 bits. Unless I'm missing something, this seems to imply that it is not always possible to fully correct any DC offset using the chip alone. Does anyone have any comments on this?
The AD8310 has a single ended output and would not directly interface to the AD9642. Do you have another driver amplifier to convert from single ended to differential between the AD8310 and the AD9642?