R-2R ladder

Discussion in 'General Electronics Chat' started by FroceMaster, Apr 9, 2015.

  1. FroceMaster

    Thread Starter Member

    Jan 28, 2012
    400
    4
    Hi.
    I will need to convert 4 digitals bits to analog input.
    Have read about R-2R Ladder. and i came with a couple of questions.
    1. Do i need a driver or gate, or can i just use the output to my MCU 16F1509 analog input ?
    2. What value will the output be , how small steps. ?

    Will use 10k and 20k
     
    Last edited by a moderator: Apr 9, 2015
  2. crutschow

    Expert

    Mar 14, 2008
    12,977
    3,220
    1. You can run the output directly to the MCU input.
    2. The maximum output will be about 93.7% of the digital input voltage.
    The theoretical step size is 1/15 of the maximum output.

    What is generating the digital input?
     
  3. FroceMaster

    Thread Starter Member

    Jan 28, 2012
    400
    4
    Thats for selecting some numbers 0-9 and a-f depending of 4 bits . Reason to use digital input is to save inputs on 16F1509. This way i could use 3 inputs instead of 10 for selecting up to 999. It will be by jumpers or a rotary switch or something. Not desided yet.
     
  4. ScottWang

    Moderator

    Aug 23, 2012
    4,850
    767
    The name of title was wrong, I already modified it.

    The R/2R DAC.
     
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