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Original question:

'VFC110' as a frequency to voltage converter

VFC110: Output frequency

Liu Yang
Expert 5945 points
Part Number: VFC110

Hi Team,

Input: 0-10V
Output: 1MHz

How does the output change when the input is 11V or 15V in the above setting?
(According to the data sheet, I feel that the output will be 0.)

Also, if the output is 0, what is the margin to the change of 1MHz-> 0Hz?

Best Regards,
Tom Liu

  • 0
    Guru 140200 points

    Hi Liu,

    can you show a schematic?

    Kai

  • 0 in reply to kai klaas69
    TI__Guru 53041 points

    Hi Liu,

    The VFC110 is a legacy product from the 1980s and there isn't much information about the product remaining.

    Question: if the output is 0, what is the margin to the change of 1MHz-> 0Hz?

    From the datasheet, here is what we know of. When input is 0V, the frequency will be near 0 (approx. 0.005% of FS 1MHz error or ~50Hz), see the attached image. 

    Question: How does the output change when the input is 11V or 15V in the above setting?


    Per the equation shown in the image below, the output frequency will increase when you increase the input voltage, because the front end is an integrator + comparator. 

    Best,

    Raymond