When using the TLV320AIC3256EVM-U, I have meet some problems.
With this topology in PPS GDE, some noise occurs.
The noise is always existing, no mater the I2S signal or analog signal is given or not.
I changed the sample rates, and the noise maybe disappear.
Some experimental result as follow.
CurrenRate Board sampling rate Is there noise?
Rate44 44100Hz yes
Rate48 48000Hz yes
Rate88 48000Hz no
Rate176 48000Hz no
Rate192 48000Hz no
I’m puzzled at the board sampling rate. What is the relationship between the SamleRate(or the CurrenRate) and the board sampling rate?
In my product, I’ll use I2S with 44.1kHz.
I used the base_main_Rate44_pps_driver.h code to my product, and the same noise occurred. So is base_main_Rate192_pps_driver.h.
How can I do to sovle the noise?
And how to select the proper sample rate?
Thanks!