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offset null pins to ground?

Discussion in 'Electronic Basics' started by tempus fugit, Aug 6, 2004.

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  1. tempus fugit

    tempus fugit Guest

    Hey all;

    I'm using a high speed opamp as a voltage follower. I'm not using the offset
    null pins - should I tie them to ground or leave them unconnected?

    Thanks
     
  2. John Larkin

    John Larkin Guest

    Unconnected.

    John
     
  3. With almost all opamps, leave them unconnected. What chip are you
    using?

    Offset pins often have higher voltage gain than the normal inputs do,
    so keep signals that might capacitively couple to them well away.
     
  4. tempus fugit

    tempus fugit Guest

    Thanks for the replies.

    The chip is an ST TSH10 single wideband opamp.
     
  5. If I was laying this out and concerned about noise pickup on the
    offset pins, I would put a small island connected to V- under pins 1
    and 8. If I could fit a trace between those pins and the adjacent
    ones, I would do that and connect it to V- also. That would keep the
    output or V+ from coupling to those pins and help keep the V-
    rejection at maximum.
     
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