This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TAS5634: TAS5548&TAS5364 chipsets ,Noise issue

Part Number: TAS5634
Other Parts Discussed in Thread: TAS5548

Tool/software:

Hi ti team,

Help find the reason why WS6.2 has noise at 283Hz.654 WS6.2 uses TI chip TAS5548 + TAS5634 scheme,
noise is detected at the frequency of 283Hz. Please refer to the following screen capture.
The TAS5548 0x51-53 register will make noise if the following values are used. The default values are fine.
We have written the following register values to the TI TAS5634 EVM board and the same noise will appear.
The customer said that the following registers did not do EQ boost, so there should be no noise. Please help to check the cause and whether there is a solution. Thank you!

Current value of the ws6.2 register 0x51-53 

51 00 7F EE 47 0F 00 23 72 00 7F EE 47 00 FF DC 7B 0F 80 23 5E

52 00 7F DD FC 0F 00 EA 9A 00 7F 39 14 00 FF 15 66 0F 80 E8 F0

53 00 80 04 7E 0F 00 6B 69 00 7F 90 73 00 FF 94 97 0F 80 6B 0F

 

The default value of register 0x51-53

51 00 80 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

52 00 80 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

53 00 80 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  • hi,

    although reverse the register value back to the EQ setting is difficult, the ws6.2 register 0x51-53 obviously performed some processing in the EQ.

    but default register value has no processing in it.

    usually no any processing in EQ will have that value.

    if customer do not need any processing, they should use the default value.

    tks

    jesse

  • Hi Jesse,

    EQ setting is required for this product, 0x51-53 cannot be set to default value.

    The attachment is the EQ setting value of BQ1 / BQ2. The value 0x51-Q53 in TI TAS5634 EVM is the value mentioned in the following email, and then noise will be generated in the 200-300Hz band during FFT test.
    According to the EQ setting in the attachment, it can be seen that the gain in the 200-300Hz band is actually around 0dB. Why will the biquads produce noise in the 200-300Hz band after setting? Thank you!

    BQ1

    BQ2

  • hi,

    this is strange, how is your configuration? stereo? or mono 1.1?

    is that possible it is affected by other devices' setting?

    tks

    jesse

  • Hi Jesse,

    During the EVM board testing, I used the default output mode, which should be Stereo. And our product is also configured in Stereo mode. Since the TI TAS5634 EVM I used only made changes to the BQ1/BQ2 values (the ones I provided earlier), the EVM board also generates the same noise, which suggests that it may not be caused by other device settings.

  • hi switch

    not sure whether this is a sw problem or HW problem.

    can you check if use other band EQ, whether it can work or not?

    about the hw problem.

    can you confirm whether the output signal having clipping or not?

    tks

    jesse

  • Hi Jesse,

    After switching to other bands, the test results were the same.

    The output voltage is approximately 100mV at 1kHz without clipping. Please refer to the following FFT sweep.

  • This noise might be caused by external interference; you can try changing the power supply.

  • This noise might be caused by external interference; you can try changing the power supply.