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LSF0108: waveform distortion

Shu-Cheng LIN
Guru 11785 points
Part Number: LSF0108

Hi Sirs,

Sorry to bother you.

Our schematic

We have tried to change the pull up resistor.

We use LSF0108, We found our waveform distortion

No passing level shift 

Passing level shift

We would like to know how to fix it.

Could you share your experience for us?

Thanks!!

  • 0
    TI__Guru* 97046 points
    Hello Shu-Cheng,
    I have notified the appropriate applications specialist. He will be back with you soon.
  • 0
    TI__Guru 62140 points
    Hi Shu -Cheng ,

    I notice that the LSF biasing is not right for a start. The 200Kohm needs to be connected to Vrefb and EN. Currently , it is connected to only EN pin which will not set the correct biasing.
    The I2S as i know is push pull interface and you dont need the pullup resistor at the input. However , 1.8V to 3.3V up translation needs pullup resistor.
    what is the output cap including the load & trace capacitance ?