Hi,
One of my customer have some problem.
Please refer to the below and send me your comment.
>Project Information
Model : High end DAC
Part : DIX4192, PCM1794
>Issue :
This is High end DAC Audio system and normally user is not hearing of Piano sound noise.
But, so-called Mania or ghost (?), One of a customer has a problem listening to the piano sound and the claim was discovered.
>Verify of issue & Test Setting :
PC->(USB)-> DDC->(SPDIF/I2S)->DAC(DIX4192)->(PCM1794,DAC)->Analog out
>We found abnormal graph of 44.1K, 88.2K,176.4Khz, when input is 1Khz, Sine wave.(Below Fig.)
But, others Freq. is normal graph of 48K, 96K, 192Khz.
>DIX4192 register setting value : datasheet-43p
- MCLK or RXCKI: 24.576MHz
- Port A master clock divider: divide by 512
- PLL1 configuration: P=2, J=8, D=0
And, We doubt is Internal PLL of DIX4192.
Thanks,
