SPI DAC
		
		
		
		
		
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general info
Based on the MCP4822 chip from Microchip.
http://ww1.microchip.com/downloads/en/DeviceDoc/21953a.pdf
physical dimensions
- Board outline: 25x25mm
 - Mounting hole diameter: 3mm
 - Mounting hole pitch: 19mm (3mm from board edge)