Datasheet

50
[Not recommended for new designs - Use XMEGA A1U series] XMEGA A1 [DATASHEET]
8067O–AVR–06/2013
27. DAC - 12-bit Digital to Analog Converter
27.1 Features
 12-bit resolution
 Two independent, continuous-drive output channels
 Up to one million samples per second conversion rate
 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
27.2 Overview
The XMEGA A1 devices features two 12-bit, 1 Msps DACs with built-in offset and gain calibration, see Figure 27-1 on
page 50.
A DAC converts a digital value into an analog signal. The DAC may use an internal 1.0 voltage as the upper limit for
conversion, but it is also possible to use the supply voltage or any applied voltage in-between. The external reference
input is shared with the ADC reference input.
Figure 27-1. DAC overview
CH1DATA
CH0DATA
Trigger
Internal 1.00V
AREFA
AREFB
AVCC
D
A
T
A
DAC CTRL
DAC CH0
REFSEL
Enable
12
12
ADC
DAC
DAC CH1
Output
Control and Driver