• State TI Thinks Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 615 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

TLV320AIC3100: Countermeasure for pop sound issue on headphone output

Masanori Tachibana
Genius 5350 points
Part Number: TLV320AIC3100

Hello support team,

I have some questions regarding TLV320AIC3100.

Our customer is studying countermeasures against pop sounds on headphone output that occurs when the power is on.

The all power supply voltage is applied, and the headphone driver is turned ON or OFF by changing "Page 1 / Register 31 D7: powered up / powered down".
The customer is trying to reduce pop sounds by adjusting "Page 1 / Register 33 D6 - D3 : Driver power-on time" and "Page 1 / Register 33 D2 - D1 : Driver ramp - up step time".

[Questions]
1. "The Driver power-on time" is greater, is it effective for pop sound countermeasures?
2. What function is "Driver ramp-up step time"?
How will the behavior of the IC change when changing this value?
3. Is there any other effective countermeasures to reduce pop sounds?

Sincerely,
M. Tachibana

  • 0
    TI__Mastermind 30210 points
    Tachibana-san,

    Yes a longer power-on time should help to reduce the pop. That being said, There are a few caveats. If you have not Selected the HP path for the DAC. Then the HPDrivers should be muted, before power down. otherwise when the HP path is not selected and the HPdrivers are not muted, there is some noise that gets coupled into the hpouts, and that noise causes a slight pop when the hpdrivers are ultimately turned on.

    If the HP path for the DAC is selected, this is less of an issue, but having the HP path in mute is still a good idea.

    When I use a power drive power on time of 1.8ms I find that the pop is substantially reduced there is a point of diminishing returns though, at 1.47 s there is still a measurable blip on the output, but it in the 10s of milivolts at worst for me. if I really listen I can notice/hear this, but i dont think I would notice if I wasn't in a quiet room and listening for it.

    best regards,
    -Steve Wilson
  • 0 in reply to Steve-Wilson
    Genius 5350 points

    Hi Wilson-san,

    Thank you for the advice regarding countermeasures of pop sound.

    When we evaluated with EVM, we confirmed the effect of "Driver power-on time".
    However, changing "Driver ramp-up step time" does not vary the pop sound, and the rising waveform of headphone output does not seem to change.

    What is the effect of "Driver ramp-up step time"?

    Sincerely,
    M. Tachibana

  • 0 in reply to Masanori Tachibana
    TI__Mastermind 30210 points
    Tachibana-san,

    The Driver ramp up step time varies the step time of the ramp up to CM. This essentially makes it ramp up faster or slower. I don't remember exactly how many discrete steps there are in the ramp up, but it may be something like 8. meaning that by varying the ramp step time, from 1-4 your ramp time would vary from 8-32ms roughly. I can take some measurements to confirm.

    best regards,
    -Steve Wilson
  • 0 in reply to Steve-Wilson
    Genius 5350 points
    Hi Wilson-san,

    I'm sorry to my late reply.

    I understood as follows. Is my understanding correct?
    "Driver power-on time" controls the supply voltage of the headphone output driver circuit. And "Driver ramp-up step time" controls the rise time of the headphone output voltage.

    In our evaluation with the EVM, the control of "Driver power-on time" was dominant, and the effect of "Driver ramp-up step time" was not seen.

    Sincerely,
    M. Tachibana