Dear Sir/Madam,

We are using Si-4713 for FM Generation. The carrier output constantly varies, +/-3.5 kHz around the carrier.

We want to utilise this IC in our production. Please suggest way to improve the frequency tolerance.

Or kindly, assist with any other best possible solution from your end.

 

Regards.

 

 

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Unanswered

  • Puneet_Cppl wrote:

    ...

    We are using Si-4713 for FM Generation. The carrier output constantly varies, +/-3.5 kHz around the carrier.

     


    Which crystal (with which accurancy) are you using to supply the RCLK?

     

    Best regards,

    Andi

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  • We are using Epson crystal Part Number 732-FC135-32.76kAA3 32.768kHz- 20 PPM
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  • Puneet_Cppl wrote:
    We are using Epson crystal Part Number 732-FC135-32.76kAA3 32.768kHz- 20 PPM

    It has +/- 20 ppm accuracy, that means: +/- 2kHz at 100 MHz

     

    Best regards,

    Andi

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  • Also, in the Si4713 datasheet in Table 9. FM Transmitter Characteristics it says:

    Transmit Frequency Accuracy and Stability: min: –3.5, max: 3.5 kHz

     

    Best regards,

    Andi

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  • Dear Andi,

    Thanks. but its 20 PPM, and crystal is of 32.786 kHz so isn't it .666 Hz?

    Actually we tried to provide signal by signal generator also, still its varying.

    Regards

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  • Yes, Andi correct that datasheet itself specifies that stability will be between +/-3.5 kHz. but then how can we optimise it and get to least variation. I am looking for a very stable output with a tolerance of +/- 10 Hz.

    Best Regards,

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