Digital to Analog Converter - AN0022 - Application ... - Energy Micro

...the world's most energy friendly microcontrollerscalibration register is adjusted so that the maximum digital value gives an output voltage that is closeor equal to the reference voltage selected. The calibration routine uses the ADC to calibrate the DAC.The internal connection between the DAC and the ADC is used, so no external connection between theADC and DAC is necessary.Since the ADC is used to calibrate the DAC, it is important that the ADC is calibrated before it is usedto calibrate the DAC. This calibration is included in the example, but it requires an external referencevoltage to be applied to ADC input channel 4 (all channels can be used).2013-05-08 - an0022_Rev1.09 12 www.energymicro.com