AD9864-saturation strength

Question

Hi, 
 what is the ADC saturation signal strength of AD9864 at normal working conditions.?

PMH · Accepted Answer

Hello, 
 The minimum signal that ADC can handle depends on the ADC's Noise Figure at Minimum attenuation that sets the noise floor of the ADC (relative to dBm/Hz), the required minimum CNR to demodulate signal, and the BW of the Signal. 
 For example, if the AD9864 as a NF=7.5 dB at min. attenuation and is demodulating a signal that is 10 KHz in bandwidth with a CNRmin=10 dB than the minimum signal is -126.5 dBm (=-174 dBm+10*log(10^3)+7.5+10 dB). 
 With regard to AGC setting, the AGC is reacting to rms power of the input signal thus the setting should take into consideration the pk-to-rms of the signal (or blocker) and set the threshold of the AGC accordingly.