ATxmega256A3B Atmel Corporation, ATxmega256A3B Datasheet - Page 317

• Manufacturer Part Number: ATxmega256A3B
• Manufacturer: Atmel Corporation

Specifications of ATxmega256A3B

• Flash (kbytes): 256 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 47
• Ext Interrupts: 49
• Usb Speed: No
• Usb Interface: No
• Spi: 8
• Twi (i2c): 2
• Uart: 6
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 16
• Adc Resolution (bits): 12
• Adc Speed (ksps): 2000
• Analog Comparators: 4
• Resistive Touch Screen: No
• Dac Channels: 2
• Dac Resolution (bits): 12
• Temp. Sensor: Yes
• Crypto Engine: AES/DES
• Sram (kbytes): 16
• Eeprom (bytes): 4096
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.6 to 3.6
• Operating Voltage (vcc): 1.6 to 3.6
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 7
• Output Compare Channels: 22
• Input Capture Channels: 22
• Pwm Channels: 22
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

26. DAC - Digital to Analog Converter
26.1
26.2
8077H–AVR–12/09
Features
Overview
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The DAC converts digital values to analog voltages. The DAC has 12-bit resolution and is capa-
ble of converting 1 million samples per second. The output from the DAC can either be
continuous to one pin, or fed to two different pins using a sample and hold (S/H) circuitry. A sep-
arate low power mode is available, and the DAC can be gain and offset calibrated.
The output signal swing is defined by the reference voltage (VREF). The following sources are
available as VREF in the DAC:
The output voltage from a DAC channel is given as:
Figure 26-1 on page 318
ity is shown.
V
• AV
• Internal 1.00V
• External reference applied to the AREF pin on PORTA or PORTB
12-bit resolution
Up to 1 Msps conversion rate
Flexible conversion range
Multiple trigger sources
1 continuous time or 2 Sample/Hold (S/H) outputs
Built-in offset and gain calibration
High drive capabilities
Internal/External reference
Possibility to use as input to analog comparator or ADC
Power reduction mode
DACx
CC
=
CHnDATA
--------------------------- - VREF
0xFFF
⋅
illustrates the basic functionality related to the DAC. Not all functional-
XMEGA A
317