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TLC7226 data sheet?

Discussion in 'General Electronics Discussion' started by 24Volts, Sep 25, 2012.

  1. 24Volts

    24Volts

    164
    0
    Mar 21, 2010
    Hello,

    A problem I have is interpreting what the spec sheet is really saying... please consider the following!!!!

    Referring to the TLC7226 part and its spec sheet at:

    http://www.ti.com/lit/ds/symlink/tlc7226.pdf

    If you go to p.4 of the data sheet and look for:

    ri(ref) Reference input resistance 2 kΩ min and 4 kΩ typical.

    Questions:

    1) Does this mean that pin#4 of the TLC7226 part has a typical input resistance from 2kilo ohms to 4 kilo ohms?

    2) Please refer to the attachment below where I tried to calculate the actual input resistance at pin #4. As a test, I have created a voltage divider to provide 2.2V as my reference voltage. I have measured the currents in the circuit. If I measure 2.2V at point "A", according to ohms law why is it that the calculation of the internal resistance comes out to 22K when the spec sheet says from 2 to 4 k???

    help!
    thanks
    r
    Attached Thumbnails
     

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    Last edited: Sep 25, 2012
  2. zivoradbre

    zivoradbre

    2
    0
    Aug 19, 2012
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