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CCS/TLV320ADC3101EVM-K: Problem about noise

XIAOHONG ZOU
Prodigy 120 points
Part Number: TLV320ADC3101EVM-K


Tool/software: Code Composer Studio

In  TLV320ADC3101EVM-K: I don't know how to set the paramete by AIC3204 SC 

the sound input from the microphone can be heard in the speaker.

In order to simplify the circuit, I modified the EVM board like the circuit diagram.

1.use only one voltage level of 3.3V

2.use BCLK and PLL not MCLK

I changed the AIC3254-Recording_Playback.cfg  to  recording_playback33v.cfg I attached and it work well.

But when I cut off the DIN and WCLK and changed my own inptut circut (it worked well when use SW2 = 1 and the AVDD ,DVDD and HPDD are not be shorted),

the speaker producted a lot of noise.

How to remove these noise?

best regards

Zou Xiaohong

recording_playback33v.cfg

  • 0
    TI__Guru 57800 points

    Hi, Zou,

    There are a couple issues in your description. The e2e title claims the post is related o the 'ADC3101 EVM but the question is for the 'AIC3204 EVM. Please select the correct part number in the subject for the next posts.

    I noticed you modified the board and shorted HPVDD with AVDD and DVDD, this is NOT recommended, AVDD and DVDD can operate with a nominal supply voltage of 1.8V (maximum 2.2V), operating these power pins with a 3.3V will lead into device malfunction. Please follow the indications from the datasheet (see Table 8.1 for maximum ratings and table 8.3 for recommended conditions).

    Assuming  that  correct supplies are used, you should be able to provide your system clocks and make the device work correctly. one thing I noticed is that you mentioned that only WCLK and DIN are provided, this is not correct as you should provide all the I²S clocks as part of the I²S bus for the device. Actually, you can provide I²S clocks from an external source using the USB-MODEVM motherboard through header J14 by configuring the bits 4 and 5 to OFF on the SW2 dip switch of the Motherboard. This will bypass the USB clocks from the motherboard. For detailed information please refer to the User's Guide of the EVM.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer