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TLV320AIC3101EVM-K: Noise flow see small peak when configure in differential mode

PYTsai
Genius 11775 points
Part Number: TLV320AIC3101EVM-K


Tool/software:

Hi 

My custsomer obsere small peak on noise flow when configure in differential mode as below 

The register setting as below, any suggestion can remove the small noise peak ?

w 30 00 00

w 30 01 80

w 30 03 10

w 30 66 02

w 30 09 00

w 30 07 0A

w 30 28 80

w 30 25 D0

w 30 26 08

w 30 13 84

w 30 16 84

w 30 15 7F

w 30 18 7F

w 30 0F 00

w 30 10 00

w 30 2B 00

w 30 2C 00

w 30 52 80

w 30 5C 80

w 30 2F 80

w 30 40 80

w 30 56 09

w 30 5D 09

w 30 33 09

w 30 41 09

w 30 19 80

Using single end setting the noise flow looks good 

  • 0
    TI__Genius 13205 points

    Hi, 

    How are you connected on the EVM? Can you send a picture? AC coupled or DC?

    Best,
    Mir

  • 0 in reply to Mir Jeffres
    TI__Genius 11775 points

    Hi Mir

    this is my customer's EVM connection 

  • 0 in reply to PYTsai
    TI__Genius 13205 points

    Hi,

    Where are you sending the data? IN2L and IN2R? or IN1L and IN1R? In your script, it looks like it would be MIC1 L and R. Where are you connecting them on the EVM, this helps us know if it is AC or DC coupled. Could you also try changing your sample rate and see if the idle tone changes. Also, when you tried testing in single ended mode, could you swap your connections of the P and M channels on the board, and see if you experience the same idle tones? I wonder if they are just present on your "M" terminal, so when you select single ended, it goes away since the "P" terminal is being used.

    Best,
    Mir