ATXMEGA256A3B-MH Atmel, ATXMEGA256A3B-MH Datasheet - Page 317

• Manufacturer Part Number: ATXMEGA256A3B-MH
• Description: MCU AVR 256KB FLASH A3B 64-QFN
• Manufacturer: Atmel
• Series: AVR® XMEGAr

Specifications of ATXMEGA256A3B-MH

• Core Processor: AVR
• Core Size: 8/16-Bit
• Speed: 32MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Number Of I /o: 49
• Program Memory Size: 256KB (128K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 4K x 8
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.6 V ~ 3.6 V
• Data Converters: A/D 16x12b; D/A 2x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-MLF®, 64-QFN
• Processor Series: ATXMEGA256x
• Core: AVR8
• Data Bus Width: 8 bit, 16 bit
• Data Ram Size: 16 KB
• Interface Type: I2C, SPI, USART
• Maximum Clock Frequency: 32 MHz
• Number Of Programmable I/os: 49
• Number Of Timers: 7
• Operating Supply Voltage: 1.6 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 12 bit, 8 Channel
• On-chip Dac: 12 bit, 2 Channel
• For Use With: ATAVRONEKIT - KIT AVR/AVR32 DEBUGGER/PROGRMMRATSTK600 - DEV KIT FOR AVR/AVR32770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAG770-1004 - ISP 4PORT FOR ATMEL AVR MCU SPI
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ATXMEGA256A3B-MU; ATXMEGA256A3B-MU

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