TVS Diode Array with EMI Filters on ADC Input
It all depends on the ADC and what input voltage range it needs. The SP6002 has a stand-off voltage of 6 V and, at  5V, it promises to only conduct no more than 1 uA. However, it only conducts 1mA at possibly 8.5 V so is it going to protect an ADC running from a 5 V supply? I don't think so - a lot of CPU in-built ADCs will not want voltages going more than half a volt beyond the supply rail so I think it won't suit these devices.

The series resistance won't be a problem and I doubt that the shunt capacitance is going to affect signals for this type of ADC.