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Digital to Analog Conversion


Microchip PIC specific D2A

Ubicom SX specific D2A

Analog to Digital Conversion

See:

Don Hyde says:

An R-2R ladder can be used to turn a group of [digital] output pins into a DAC for a few cents. Below is a 3-bit DAC. Using 3 [digital] output pins (beware of the odball open drain pins, they're no good for this), this circuit will provide 0 - Vcc*(7/8) volts out, with a 2R source impedence.

It can be extended to more bits by replicating the MSB R-2R end of the ladder.

Up to 4 bits can be achieved with 5% resistors.

Up to 6 bits can be achieved with 1% resistors.

...

In many applications, it would be advisable to buffer the output with an op-amp.

A circuit like this can achieve waaay higher output frequencies than PWM, and can be easier to filter, at the expense of using up a bunch of pins. 

OUT o--+-/\/\/\/\----o MSB
       |    2R
       \
       /
       \ R
       /
       |
       +-/\/\/\/\----o Middle bit
       |    2R
       \
       / R
       \
       /
       +-/\/\/\/\----o LSB
       |    2R
       \
       /
       \ 2R
       /
       |
      ---
      ///

PICList Thread '[EE]: high res DA challenge'

Also:

See also:

file: /Techref/io/d2a.htm, 3KB, , updated: 2010/12/21 08:30, local time: 2013/5/24 00:50,
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