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ADC/DAC

GreenGiant

Feb 9, 2012
842
Joined
Feb 9, 2012
Messages
842
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.
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,510
Joined
Jan 21, 2010
Messages
25,510
Here's a few factors:

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