• State
  • Locked Locked
  • Replies 4 replies
  • Subscribers 31 subscribers
  • Views 1286 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

Audio Stereo (TPA2026D2) thru Micro controller

Anil Raju N
Prodigy 205 points
Other Parts Discussed in Thread: TPA2026D2

Hi,

Iam Using TPA2026D2 Stereo amplifier,Iam Driving Speaker thru below

DSPIC(Micro controller PWM Pins)==>RC Low pass filter==>Stereo Amplifier==>Speaker.

I used RC low pass filter, i would like to know RC low pass filter is okay or i need to use some other low pass filter to drive the speaker without any problems, I would like to know what kind of Low pass filter is better for this kind of requirements.

please suggest your feedback on circuit.

  • 0
    TI__Guru**** 189399 points

    Hi, Anil,

    In the part marked, "to DSPIC PWM Pins," you need to swap the order of the R and C. This will also result in a -3 dB point of around 4 kHz, which seems a little too low for audio.

    Also, make sure that you put a smaller ceramic cap as close as physically possible to C3/B4/C4 as this cap is critical to provide high frequency decoupling to our device. I recommend something in the range of 0.1 uF to 1 uF. Check the EVM schematic for more information.

    -d2

  • 0 in reply to Don Dapkus
    Prodigy 205 points

    Hi Dan,

    Thank you so much for your response.

    Yes the input of the audio is from Micro controller PWM Pins, I will swap the order of R and C(this is correct because its passes only Audio signals blocks DC signals.), i would like to know how to increase my audio -3db to better and 4khz to around 10-15Khz frequency, please suggest how to correct my circuit to get good quality of audio.

    Regards

    Anil

  • 0 in reply to Anil Raju N
    TI__Guru**** 189399 points

    Hi, Anil,

    Sorry for the delay; I was out of the office.

    Can you post a plot of your performance now? How does it compare to the data in the data sheet?

    -d2

  • 0 in reply to Don Dapkus
    Prodigy 205 points

    Hi Dan,

    Iam not simulating the circuit, i would like to know solution which values would be better to reach good Quality of sound.

    Regards

    Anil