USB-7845 ADC input channel to channel sampling skew or synchronization?

[dbur]

We are using the USB-7845 ADC inputs to sample multiple single ended signals and then needing to compute/generate the differential waveform form pairs of inputs.  We are finding skew in the ADC inputs causes 'spiky' artifacts in the differential output particularly when a large fast common mode transition occurs.

I see no spec for channel to channel ADC sample skew for this device.  Is it possible to obtain that info?

Also, if the SAR ADC channel converters are not synchronized to the same internal conversion clock cycle is there some way to make that happen?

Are they synchronized in some way by default, or is the channel to channel clock synchronization just random?

Thanks.

[ZYOng]

Did you place all AI in a single node or separate nodes?

I remember seeing a single node with 8 channels take longer to run than 8 separate nodes with individual channels, which led me to believe that the IO does not execute in parallel when placed inside the same node. I might be wrong though.