Yes, there will be a short transition/discontinuity in the NCO output as it changes to its new frequency. If holding the SYNC pin (or register) in a "high" state, the NCO will not be present. The main idea is to provide a pulse to quickly update…
Can you share a picture of the noise you are seeing? What are the registers you are writing in order to configure the ADC in 1 wire decimation mode?
Here is an FFT of the complex data with a 10 MHz NCO applied (no analog input present).
Here is an…
Part Number: ADC3444 I'm curious to hear if anyone has used this ADC with a DC-coupled input. If so, did you use a differential amplifier to drive it? Which part? Any passive implementation options?