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TAS6421Q1EVM: Output distortion w/ 96ksps rate and input signal > 39kHz

Part Number: TAS6421Q1EVM
Other Parts Discussed in Thread: TAS6511-Q1

Hello,

I'm trying to use TAS6421 to amplify a 40kHz sine using the 96kHz sample rate.

When testing, it seems the signal out is quite unstable / distorted.

Perhaps I have configured something incorrectly?

As a separate test, I input a 21kHz sine using a 44.1kHz sample rate and get similar results.

How to configure the amplifier to pass a 40kHz sine at 96kHz sample rate?

Also, is there data available showing 40kHz through this amplifier?

Thank you,

Jarrod

  • Jarrod,

    What are you using to generate the signals?  Could the source be limited?  I will verify this on our bench.

    Regards,
    Gregg Scott

  • Gregg,

    Audacity and (2) REW signal generator software per roomeqwizard.com were used to generate the signals.

    An example wave file created with REW is attached.

    File was played through a PC (w/ codec Realtek ALC892) and observed on an oscilloscope.

    Separately, the file was analyzed with Labview for generating a FFT to verify the 40kHz signal.

    Thank you for your time.

    Best regards,

    Jarrod

  • Jarrod,

    I was able to reproduce your 40K signal.  I tried it with a new device and was successful.  How much power do you need for your load?  The new device is the TAS6511-Q1.

    Regards,
    Gregg Scott

  • Gregg,

    Thank you for looking into this.  I need ~ 40W, and only one channel.

    I'm open to suggestions to other parts so it's good to know the TAS6511-Q1 is capable.  Hopefully it will be available soon.

    I chose to evaluate TAS6421 because it's available whereas the TAS6511 is not <yet>.

    Perhaps TAS6421 is not the best choice for my app of 40kHz at 40W as it appears it's not made for it.

    Best regards,

    Jarrod