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Digital to Analog Converters. These take serial or parallel data and turn them into an analog signal. Of course you can use a R2R resistor ladder but these are compact and can use fewer pins

Image Part # & Datasheet Description Distributor Eagle library part
mcp4921_t.jpg MCP4921 The cheapest 12-bit thru-hole DAC we found
Input via SPI
Mouser Digikey Adafruit:MCP4921
/home/ladyada/public_html/wiki/data/attic/partfinder/codec.1286041467.txt.gz · Last modified: 2016/01/28 18:05 (external edit)