Noise issue occurs on audio output from AD9398.
Noise issue is that small pop noise occurs one time per 5 seconds. And you can hear it on 10kHz sine wave more easily than 1kHz sine wave.
The condition is following.
-All pictures(480p,1080i, VGA)
-All sampling rate(32, 44.1, 48kHz)
-To set FIFO Reset UF, FIFO Reset OF(0x59[2:1]) effects this issue.
It reduces the frequency of occurrence but does not solve this issue.
-To set N_CTS_Disable(0x58) effects this issue.
It can kill the noise occasionally.
-The register settings is attached.
The settings are based on your instruction of datasheet page12.
Please give me your advice to solve this issue.