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TPA6304-Q1: Spread spectrum configuration consultation

Alan Xia
Expert 7495 points
Part Number: TPA6304-Q1

Tool/software:

Hi team，

I have a few questions about the spread spectrum of 6304 that I would like to confirm. The specification states that the following registers need to be modified for LOW EMI.

1) SSC1: Both Low EMI and reset are written as 0x22, but in the description in the red box, after reset it is 0x82. If I want to enable Low EMI mode, do I need to write 0x82 here or just keep the default?

2) SSC2: Why is only SSC2 turned off in Low EMI mode? If you want to turn on SSC2 and SSC3 at the same time, is 0x80→0xA2 correct?

3) I want to confirm what is the variable frequency range of the SSC spread spectrum of 6304? Is there a register to set it?

  • 0
    TI__Genius 10190 points

    Alan,

    Reset value of 100010b is exactly 0x22. the higher two bit 0 was just ignored.

    Alan Xia said:

    1) SSC1: Both Low EMI and reset are written as 0x22, but in the description in the red box, after reset it is 0x82. If I want to enable Low EMI mode, do I need to write 0x82 here or just keep the default?

    at low EMI mode, not every parameter need to be changed. as table7-1 shows, the changes only happen at SS3 and SS4.  others keep no change.

    Alan Xia said:

    2) SSC2: Why is only SSC2 turned off in Low EMI mode? If you want to turn on SSC2 and SSC3 at the same time, is 0x80→0xA2 correct?

    It is not recommended to flexibly change SS frequency, as a different SS will impact audio performance, for example FFT tones and noise. to avoid makes troubles during customer production, TI only release and guarantee datasheet specified configuration.

    Alan Xia said:
    I want to confirm what is the variable frequency range of the SSC spread spectrum of 6304?

    If you just want to play around it and know how for internal study use, please reach to us offline.

    Dylan