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TAS6584-Q1: TAS6584 CH1 CH3 volume issue

John Chen
Prodigy 40 points
Part Number: TAS6584-Q1

Tool/software:

Dear TI Expert,

I connect SDIN1 to GPIO as SDIN2 to get 4 CH output application.

And CH1 and CH3 play same stream as expect.

However, I setup same analog gain and digital volume for CH1 and CH3.

But speaker volume definitely not same (CH1>CH3)???

May I know possible cause?

In addition, I applied TAS6684 new chip datasheet for a while, but not any response yet, what's going on?

We purchased a lot of TAS6584 and we are TI fans...

Regards,

John  

  • 0
    TI__Mastermind 38065 points

    Hi John,

    Please provide the digital gain and analog gain settings you are using.  It will be measured into a 4 ohm load and not into a speaker for measurement.  Do you use the same speaker for all channels in your output signal level determination?

    Regards,
    Gregg Scoot

  • 0 in reply to Gregg Scott
    Prodigy 40 points

    Hi Gregg,

    Yes, I used same speaker to hear the volume between CH1 and CH3.

    Analog gain is -5dB.

    Digital gain is -5dB.

    I will measure the signal you mentioned in next.

    Thank you for help 

    Regards,

    John

  • 0 in reply to John Chen
    TI__Mastermind 39630 points

    Hi John

    John Chen said:
    In addition, I applied TAS6684 new chip datasheet for a while, but not any response yet, what's going on?

    Just approved it.

    John Chen said:

    Yes, I used same speaker to hear the volume between CH1 and CH3.

    Analog gain is -5dB.

    Digital gain is -5dB.

    May I ask that if you are using PPC3 to control? Perhaps a screen cut on the software would be clear.

    And if not, maybe read the register 0x4A and 0x4C to check the analog gain value. And read 0x40, 0x42 value to check Volume.

  • 0 in reply to Shadow He
    Prodigy 40 points

    Dear Shadow,

    Sorry for the late reply.

    0x4A=0x14, 0x4C=0x14

    0x40=0x0x3A, 0x42=0x3A.

    I used same speaker to measure sound level.

    CH1>CH3 4~5dB.

    Thank you for help.

    Regards,

    John

  • 0 in reply to John Chen
    TI__Mastermind 39630 points

    Hi John

     I tested same as your condition, and the output waveform seems fine from the EVM.

    CH1 and CH3:

    Maybe you could also use oscilloscope to check the waveform. And there's maybe some other thing we missed.

    After you power up the amp, what I2C script you have sent? Please give me all of them, let me check it.

  • 0 in reply to Shadow He
    Prodigy 40 points

    Dear Shadow,

    Thank you for feedback.

    If I continue to write same volume and "PLAY instruction" to CH1/CH3.

    Will it impact the result?

    What is start point of volume ramp up? Set volume or PLAY?

    Thank you.

    Regards,

    John 

  • 0 in reply to John Chen
    TI__Mastermind 39630 points

    Hi John

    John Chen said:

    If I continue to write same volume and "PLAY instruction" to CH1/CH3.

    Will it impact the result?

    Not affected anything.

    John Chen said:
    What is start point of volume ramp up? Set volume or PLAY?

    Set PLAY, device will start transfer Hi-Z to PLAY, and volume will ramp from minimum to your setting value. And if you change the volume during the PLAY, the volume will also ramp to your new target, won't jump to it, to avoid pop.

  • 0 in reply to Shadow He
    Prodigy 40 points

    Dear Shadow,

    Understood, I will try to dig out possible cause according to your inputs.

    Again, appreciated your professional help.

    Regards,

    John