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ADC/DAC

Discussion in 'General Electronics Discussion' started by deepak kumar panda, Jun 17, 2014.

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  1. deepak kumar panda

    deepak kumar panda

    8
    0
    Mar 21, 2012
    Dear Friends,

    What are the factors of choosing an ADC or DAC?
    How should be decide which ADC/DAC to use?
     
  2. GreenGiant

    GreenGiant

    841
    6
    Feb 9, 2012
    There are lots of things to look at.

    Generally you look at input/output voltage/current ranges to see if the meet your needs. Then you look at resolution, most of the time higher is better but sometimes you don't need a ton of resolution, if you only need to read 0-10 volts in 1 volt increments you only need a 4 bit ADC, but if you need to measure 0-10 volts in 1 millivolt increments then you need a 14 bit ADC.

    There is also the problem of speed, the higher the resolution the faster it is going to need to read. (0-10 volts over 1 second = 62.5 milliseconds per bit for a 4 bit, or 1 second = 61 microseconds (.061 milliseconds) per bit for a 14 bit).

    It may help to know what the application is.
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,412
    2,780
    Jan 21, 2010
    Here's a few factors:

    • Accuracy,
    • linearity,
    • speed,
    • voltage range,
    • reference voltage,
    • interface,
    • available packages,
    • cost,
    • availability,
    • familiarity,.
     
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