參數資料
型號: AV80C52TXXX-20:D
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP44
封裝: 1.40 MM HEIGHT, VQFP-44
文件頁數: 73/134頁
文件大小: 3805K
43
8068U–AVR–06/2013
XMEGA A3
Not recommended for new designs -
Use XMEGA A3U series
26. DAC - 12-bit Digital to Analog Converter
26.1
Features
One DAC with 12-bit resolution
Up to 1 Msps conversion rate for each DAC
Flexible conversion range
Multiple trigger sources
1 continuous output or 2 Sample and Hold (S/H) outputs for each DAC
Built-in offset and gain calibration
High drive capabilities
Low Power Mode
26.2
Overview
The XMEGA A3 features one two-channel, 12-bit, 1 Msps DACs with built-in offset and gain cal-
ibration, see Figure 26-1 on page 43.
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 26-1.
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 can also be configured to do conversions triggered by the Event System to
have regular timing, independent of the application software. DMA may be used for transferring
data from memory locations to DAC data registers.
The DAC has a built-in calibration system to reduce offset and gain error when loading with a
calibration value from software.
PORTB each has one DAC. Notation of this peripheral is DACB.
DAC
Channel A
Register
Channel B
Register
Event
Trigger
Configuration
Reference selection
Channel A
Channel B
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