ATXMEGA32E5 datasheet(59/153 Pages) MICROCHIP

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Data Sheet Complete

DS40002059A-page 59

ATxmega32E5/16E5/8E5

29. DAC – Digital to Analog Converter

29.1 Features



One Digital to Analog Converter (DAC)



12-bit resolution



Two independent, continuous-drive output channels



Up to 1 million samples per second conversion rate per DAC channel



Built-in calibration that removes:



Offset error



Gain error



Multiple conversion trigger sources



On new available data



Events from the event system



Drive capabilities and support for



Resistive loads



Capacitive loads



Combined resistive and capacitive loads



Internal and external reference options



DAC output available as input to analog comparator and ADC



Low-power mode, with reduced drive strength



Optional EDMA transfer of data

29.2 Overview

The digital-to-analog converter (DAC) converts digital values to voltages. The DAC has two channels, each with 12-bit res-

olution, and is capable of converting up to one million samples per second (Msps) on each channel. The built-in calibration

system can remove offset and gain error when loaded with calibration values from software.

Figure 29-1. DAC Overview

A DAC conversion is automatically started when new data to be converted are available. Events from the event system can

also be used to trigger a conversion, and this enables synchronized and timed conversions between the DAC and other

peripherals, such as a timer/counter. The EDMA controller can be used to transfer data to the DAC.

The DAC is capable of driving both resistive and capacitive loads aswell as loads which combine both. A low-power mode

is available, which will reduce the drive strength of the output. Internal and external voltage references can be used. The

DAC output is also internally available for use as input to the analog comparator or ADC.

DAC0

DAC1

CTRLA

CH1DATA

CH0DATA

Trigger

Internal Output

enable

Enable

Internal 1.00V

AREFA

Reference

selection

AVCC

Output

Driver

Output

Driver

Int.

driver

CTRLB

EDMA req

(Data Empty)

EDMA req

(Data Empty)

Select

Enable

AC/ADC

AREFD

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