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PCM5242 tuning EQ cause scale decrease issue

Bing Dong
Prodigy 450 points

Other Parts Discussed in Thread: PCM5242

Hi team,

Thanks a lot for your explanation of my” PCM5242 tuning EQ cause scale decrease issue”as below, ,https://e2e.ti.com/support/data_converters/audio_converters/f/64/p/537455/1981142#1981142but I still can not understand completely and raised this new section

My question is :

1. My testing condition is that the analog output voltage of PCM5242 haven't reach the full scale 4.2Vrms, no matter what the output analog scale is ,this issue will occur,so what is the full scale you refered? Is it the digital full volume of miniDSP or some one else?

2.  customer want to  get a absolute value,if setting +6dB at 16Khz EQ, They want to get the +6dB Gain tested at AP ,not a relative vaule.  I have tried to increase the Q value of 16Khz EQ, It works,but customer don't want to modify Q, do you have any comments?

  • 0
    TI__Guru* 84915 points
    Hello, Bing Dong,

    1. The PCM5242 supports a different full scale output when it is configured for single-ended and differential. The device should be used in differential mode in order to reach the full-scale voltage of 4.2Vrms. In case of single-ended configuration, the device supports a full-scale voltage of 2.1Vrms.

    2. Do you know which sampling rate customer is using? Customer would need to consider the filter characteristics of electrical characteristics section of datasheet.

    Best regards,
    Luis Fernando Rodríguez S.