ATXMEGA8E5_14 datasheet(53/147 Pages) ATMEL

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XMEGA E5 [DATASHEET]

Atmel-8153I–AVR-ATxmega8E5-ATxmega16E5-ATxmega32E5_Datasheet–08/2014

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

resolution, 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.

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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