[quote user="Tom Saluzzo"]What is the proper way to terminate the analog input into A5?[/quote]
Most MSP analog inputs do not need any termination on the MSP side.
All analog inputs to ADC10/ADC12 and also to those SD16/24 with input switches are connected to an internal break-before-make T-Switch. If they are not currently used by the ADC, they are disconnected from the analog part and there’s a GND shield between to minimize any crosstalk.
Unused inputs to single-source SD16/SD24 converters might profit form termination to minimize operating current. But I have no data on this.