Datasheet

51
XMEGA A1U [DATASHEET]
Atmel-8385H-AVR-ATxmega64A1U-128A1U-Datasheet–AVR–04/2014
30. DAC – 12-bit Digital to Analog Converter
30.1 Features
 Two digital to analog converters (DACs)
 12-bit resolution
 Two independent, continuous-drive output channels
 Up to one 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
 High 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 DMA transfer of data
30.2 Overview
The digital-to-analog converter (DAC) converts digital values to voltages. The DAC has two channels, each with12-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 30-1. DAC overview.
CTRLA
CH1DATA
CH0DATA
Trigger
Trigger
Internal Output enable
Enable
Internal 1.00V
AREFA
AREFB
Reference
selection
AVCC
Output
Driver
Output
Driver
D
A
T
A
Int.
driver
D
A
T
A
CTRLB
DMA req
(Data Empty)
DMA req
(Data Empty)
Select
12
12
Select
Enable
To
AC/ADC