Datasheet

25. DAC – Digital to Analog Converter
25.1. Features
• 10-bits resolution
• 8-bits linearity
• ±0.5LSB accuracy between 100mV and AV
CC
- 100mV
• V
out
= DAC × V
REF
/1023
• The DAC could be connected to the negative inputs of the analog comparators and/or to a
dedicated output driver
• The output impedance of the driver is around 100Ohm. So the driver is able to load a 1nF
capacitance in parallel with a resistor higher than 33K with a time constant around 1μs
25.2. Overview
The Atmel ATmega16M1/32M1/64M1 features a 10-bit Digital to Analog Converter. This DAC can be
used for the analog comparators and/or can be output on the D2A pin of the microcontroller via a
dedicated driver.
The DAC has a separate analog supply voltage pin, AV
CC
. AV
CC
must not differ more than ±0.3V from
V
CC
. See the ADC description for how to connect this pin.
The reference voltage is the same as the one used for the ADC, see the description in the ADMUX
register. These nominally 2.56V V
REF
or AV
CC
are provided On-chip. The voltage reference may be
externally decoupled at the AREF pin by a capacitor for better noise performance.
Atmel ATmega16M1/32M1/64M1 [DATASHEET]
Atmel-8209F-ATmega16M1/32M1/64M1_Datasheet_Complete-10/2016
348