Mitch,

on this page is an EVM board for the ADS7828

User Guides (1)

http://www.ti.com/product/ADS7828/technicaldocuments

The last page of the pdf shows a schematic of the EVM. It has
series resistors with optional user caps

I've made discrete circuits for a similar purpose, all DC inputs

For instance a 4051 switch + TLC549 serial ADC to read a bank
of potentiometers, and a 74HC4067 switch + ADS7800 ADC (way
back when they were Burr Brown) for several environmental sensors

Neither circuit used any caps on the inputs, worked fine. And I don't
recall using caps with PIC ADCs.

Joe


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