I have a question on the way the AD7656 is specified in the Specification Table.
The DC Accuracy is specified as Positive Full Scale Error (±0.75% FSR max, ±0.22% FSR Typ) and Negative Full Scale Error (the same values).
When I use the device in a Bipolar mode at ±10V it looks like the ADC could have an error of ±150mV (0.75% x 20) at the limits of positive and negative 10 volts. That would end up as an error of ±1.5% at 10V. Am I looking at the specification correctly?