I'm reading the datasheet for the AD7376 and it says the following:
Because of the ESD protection diodes that limit the voltage compliance at Terminals A, B, and W (see Figure 30), it is important to power VDD/VSS before applying voltage to Terminals A, B, and W. Otherwise, the diodes are forward biased such that VDD/VSS are powered unintentionally and affect the system. Similarly, VDD/VSS should be powered down last. The ideal power-up sequence is in the following order: GND, VDD, VSS, digital inputs, and VA/VB/VW. The order of powering VA, VB, VW, and the digital inputs is not important, as long as they are powered after VDD/VSS.
So exactly how sensitive is this VDD and VSS to VA, VB and VW in time? We have a system that we'd like to add this device to and power all comes up together. The AD7376 would be a feedback pot on a non-inverting amplifier. I'm thinking its probably a non-issue since the op-amp and AD7376 will get power at the same time and the output from the op-amp will trail the supply coming up. Just would like a good feel for how much time lag should VA, VB and VW allow for VDD and VSS.