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TLV320ADC3101: PGA mute does not work

user1895036
Prodigy 250 points
Part Number: TLV320ADC3101

I'm using ADC3101 with our embedded audio application.

But I cannot mute the PGA by writing register "Left Analog PGA settings" and "Right Analog PGA settings" to 0x80 (80h).

Do I need any other setting to mute the PGAs?

The following the my I2C log to setup ADC3101.

I use the ADC3101 as BCLK slave to other CODEC (AIC3101).

WR(19): 00 00
WR(19): 04 07
WR(19): 05 11
WR(19): 06 20
WR(19): 07 00
WR(19): 08 00
WR(19): 05 91
WR(19): 12 88
WR(19): 13 82
WR(19): 14 80
WR(19): 15 80
WR(19): 1b 30
WR(19): 3d 01
WR(19): 51 c0
WR(19): 52 00
WR(19): 00 04
WR(19): 08 7f
WR(19): 09 e7
WR(19): 0a 80
WR(19): 0b 19
WR(19): 0c 7f
WR(19): 0d d0
WR(19): 48 7f
WR(19): 49 e7
WR(19): 4a 80
WR(19): 4b 19
WR(19): 4c 7f
WR(19): 4d d0
WR(19): 00 01
WR(19): 34 fc
WR(19): 36 3f
WR(19): 37 fc
WR(19): 39 3f
WR(19): 00 00
WR(19): 53 68
WR(19): 54 68
WR(19): 00 01
WR(19): 3b 00
WR(19): 3c 00
WR(19): 34 fc
WR(19): 36 3f
WR(19): 37 fc
WR(19): 39 3f
WR(19): 00 00
WR(19): 53 68
WR(19): 54 68
WR(19): 00 01
WR(19): 3b 80
WR(19): 3c 80

  • 0
    TI__Guru 57800 points

    Hi, Hiromu,

    The code seems correct, Can you please answer the following questions to get a better approach to this issue?. What is the exact behavior of the device before and after you send the 'mute  PGA' command?. Are you able to notice the change of the gain in the output with the PGA control?. Also, can you please try reading the PGA settings register after sending '0x80' to verify that it is correctly written?

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0 in reply to Diego Melendez
    Prodigy 250 points
    Hi Diego -san

    I set the PGA gain of each channel to 0dB ("00 01", "3B 00", "3C 00"), then I set the PGA mute ("00 01", "3B 80", "3C 80").
    The level of A/D data is same . (It seems to be no gain change.)
    And I will try to read the PGA setting, please wait for a moment..