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PCM1862: At high frequencies, the output audio amplitude is reduced

user4637774
Intellectual 340 points
Part Number: PCM1862
Other Parts Discussed in Thread: PCM1780

The composition of the whole link is: audio input -- > PCM1862 (ADC) -- >PCM1780(DAC) -- > Audio output; However, in the case of high frequency, the output audio amplitude will be reduced, and the waveform is relatively complete (see the  pic1-1k5 input, pic2-4k input). The input and output points of the test are the direct-connected input of adc and the direct-connected output of dac, and there are no other OPA
See   pic PCM1862,pic PCM1780 for the register configuration of PCM1862 and PCM1780. The default value is the register that is not configured.

pic1-1k5：

pic1-1k5

pic2-4k：

pic2-4k

pic PCM1862：

PCM1862

pic PCM1780：

PCM1780

  • 0
    TI__Expert 6275 points

    Hello, 

    Allow 24hrs for a response. 

    Regards. 

  • 0
    TI__Expert 6275 points

    Hey, 

    To debug this, recreate the input and output signals from both devices on an audio precision x500 or x2700, or Use a set up that observes the signal path for both devices separately but using a constant asi bus configuration. You wouldnt want both devices having different asi bus formats that won't allow the input and output signals to be synchronous in their timing. Try matching up the asi configurations for both devices separately, then integrating the two devices for the full signal chain. 

    Do that, and make sure the gain setting on both of the devices add up to zero amplification.

    Regards,

    Ore.