atxmega128a4-mu ATMEL Corporation, atxmega128a4-mu Datasheet - Page 36

• Manufacturer Part Number: atxmega128a4-mu
• Description: Atxmega16a4 8/16-bit Avr Xmega Microcontroller
• Manufacturer: ATMEL Corporation

24. DAC - 12-bit Digital to Analog Converter
24.1
24.2
36
Features
Overview
ATxmega A4
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The XMEGA A4 features one 12-bit, 1 Msps DAC with built-in calibration of offset and gain, see
Figure 24-1 on page
A DAC converts a digital value into an analog signal. The DAC may use the bandgap reference
voltage as upper limit for conversion, but it is also possible to use the supply voltage or any
applied voltage in-between. An external reference input is shared with the ADC reference input.
Figure 24-1. DAC overview
The DAC has one continuous output with high drive capabilities for both resistive and capacitive
loads. It is also possible to split the continuous time channel into two Sample and Hold (S/H)
channels; each with separate data conversion registers.
A DAC conversion may be started from the application software by writing the data conversion
registers. The DAC may also be configured to do conversions triggered by the Event System to
have regular timing independent of the application. DMA may be used for transferring data from
memory location to DAC data registers.
The DAC has a built-in calibration system that removes offset and gain error.
The DAC belongs to PORTB. Notation of this peripheral is DACB.
One DAC with 12-bit resolution
Up to 1 Msps conversion rate for each DAC
Flexible conversion range
Multiple trigger sources
1 continuous time or 2 Sample and Hold (S/H) outputs for each DAC
Built-in offset and gain calibration
High drive capabilities
DAC Power reduction mode
Channel A
Channel B
Register
Register
36.
Reference selection
Configuration
Trigger
DAC
Event
Channel A
Channel B
8069A–AVR–02/08