• State Resolved
  • Locked Locked
  • Replies 5 replies
  • Subscribers 48 subscribers
  • Views 3011 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.

VFC32 question

Terry Wu
Expert 1680 points
Other Parts Discussed in Thread: VFC32, VFC320

Hello,

I have a V to F and F to V inquiry and want to use VFC32/320 to implement.

- Is VFC32 need dual power rail  ? Can it work at single power supply ? ex: +15V .

- VFC32 and VFC320 is performance difference at Linearity accuracy,right ?

Many thanks !

  • 0
    Guru 21975 points

    Terry,

    Yes, both the VFC32 and VFC320 require dual (+/-) power supplies. The VFC320 is higher performance and is a different chip design.

    Regards, Bruce.

  • 0 in reply to Bruce Trump
    Expert 1680 points

    Dear Bruce,

    More questions :

    - VFC320 spec show HIGH LINEARITY: 12 to 14 bits <=Does it mean VFC320 performance(accuracy) can meet 12~14 bit ADC's LSB ?

    - How about the VFC32 accuracy by bits ?

    Many thanks for your reply !

  • 0 in reply to Terry Wu
    Guru 21975 points

    Terry,

    Yes, when used as an A/D converter it can provide 12 to 14 bit integrated non-linearity performance.

    Bruce

  • 0 in reply to Bruce Trump
    Expert 1680 points

    Dear Bruce,

    Would you kindly check this V to F and F to V schematic for 5V and 50KHZ full scale range operation  ?

    Many TKS !

  • 0 in reply to Terry Wu
    Guru 21975 points

    Terry,

    The basics seem correct.

    Be aware that as the input approaches zero, the frequency approaches zero. The output of the f/v converter will be a series of pulses that have an average value equal to the input voltage. This can be smoothed more by increasing the value of C2 in the f/v converter but at the expense of slow response at higher frequency. For this reason, most v/f > f/v circuits offset the input so that the frequency never goes to zero. A 5kHz to 50kHz range might be appropriate.

    The adjustment circuit injects an offset to tune the offset of the whole system.

    Regards, Bruce.