AD9874 - Allowed MAx Frequency at the input of ADC

Question

Hello, 
 I would like to know what is the allowed Maximum frequency at the input of sigma-delta ADC (not the IF input) if the ADC can do under-sampling. I want to use IF channel filters (10.7MHz, 21.4MHz, 70MHz...) before ADC. 
 
 Thanks in adcance, 
 XL

FormerMember · Accepted Answer

The ADC can operate up to 26 MSPS and its IF2 is equal to 1/8th its sample rate. The LNA /mixer can support frequencies up to 300 MHz.
The 1st IF will typically depend on the RF frequency band and crystal filters are often used in front of the IF input of the device. Popular frequencies include 21.4, 45, 70 MHz but others higher freq crystals also exist.

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AD9874 - Allowed MAx Frequency at the input of ADC