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TAS2505EVM: Test data for pop noise when muted

dai_sakamoto
Prodigy 180 points
Part Number: TAS2505EVM
Other Parts Discussed in Thread: TAS2505-Q1, TAS2505

Tool/software:

==≈======================

My specifications and register settings

OutDAC: Class D

Input : TDM or I2S

Speaker load: 8Ω/2W

SPKVDD: 5V
MCLK frequency: Undetermined
Reg63 ”DAC Channel Volume Control's Soft-Step control”...Soft-Stepping is 1 step per 1 or 2 DAC Word Clock

==========================

I would like to check whether there is any pop noise when switching from maximum volume to MUTE with a Class D amplifier. Are there any experimental videos or test data using an evaluation board?

*It does not have to be an evaluation board, as long as you have test data for the TAS2505 or TAS2505-Q1

P.S. ====
Please also answer the following questions. ↓
Is it possible to completely eliminate the pop noise by adjusting the soft-stepping change rate (DAC fs, Reg63)?
If this is not possible, is it possible to eliminate the noise when muted using an external circuit?

  • 0
    TI__Guru** 102355 points

    Hi Sakamoto,

    I don't recall such data available from previous testing. However, you can consider the following recommendations for best performance during volume adjustment:

    • Soft-stepping feature applies to the DAC volume control, so whenever volume adjustment is required, it is best to use the DAC volume control on Page 0 Register 65.
    • Similarly, if need to mute it is best to use the mute control on Page 0 Register 64.
    • Keep the Class-D gain on Page 1 Register 48 as a fixed value, modify this only during device initialization.
    • You may also keep the Speaker volume control on Page 1 Register 46 as fixed value.

    Best regards,
    -Ivan Salazar
    Applications Engineer