LM2907 Voltage Input

Discussion in 'General Electronics Chat' started by Tony Elliott, Jan 16, 2016.

  1. Tony Elliott

    Thread Starter Member

    May 8, 2015
    140
    2
    Hi AllAboutCircuits,

    I am using a LM2907-N for a frequency to voltage circuit. I have looked at the data Sheet http://www.ti.com/lit/ds/symlink/lm2907-n.pdf

    I see the maximum voltage is 28 volts, but if I use a ( -15 ground +15 ) does that exceed the voltage as 30 volts. Should I use ( -13 ground +13 ) 26 volts?

    The circuit I am using is on page 15


    Screen Shot 2016-01-16 at 22.28.27.png

    If you need any more information I will gladly post.

    Anthony
     
  2. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,386
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    The device is a single supply circuit, meaning you connect power between the +15V and ground.

    Since 15 V < 28 V your device is quite safe. :rolleyes:
     
  3. Tony Elliott

    Thread Starter Member

    May 8, 2015
    140
    2
    So I don't need the - voltage, only ground and +? or do I use only - + ?
     
  4. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    If you would use only + and -, then you still exceed 28 v.

    Use 15v from 0 to V+.
     
  5. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    Yes, just like the figure on page 15 of the data sheet.
     
  6. #12

    Expert

    Nov 30, 2010
    16,277
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    Yes, just like the schematic you posted.
     
  7. Tony Elliott

    Thread Starter Member

    May 8, 2015
    140
    2
    Thank you for your advice, yes I tried it today and it worked perfectly. :)

    15v.JPG
     
    ErnieM likes this.
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