If the GPIO pins are not to be used in a given circuit with the ADS7951, is it better to leave them floating, or should they be tied to a fixed potential? If the former, should they be programmed as outputs or inputs? If the latter, should they be tied high, low, or would a mix be best depending upon the alternate function for each pin? Finally, which of these options draws the least amount of power?
Other chips' spec sheets document the best practices in these situations, but I could not find anything in the ADS79xx data.
Note: There might be a slight advantage to leaving the pins floating, because I can leave traces on the board to access them and enable them in the future. However, that is an incredibly unlikely situation, given that I plan on using the chip at its maximum 1 MHz bandwidth (leaving little bandwidth for reading or writing GPIO anyway), so I anticipate that the lowest power consumption option will have higher precedence than the most flexible option.