atmega32c1 ATMEL Corporation, atmega32c1 Datasheet - Page 266

• Manufacturer Part Number: atmega32c1
• Description: Atmega32m1 Automotive 8-bit Avr Microcontroller With 32k/64k Bytes In-system Programmable Flash
• Manufacturer: ATMEL Corporation

21. Digital to Analog Converter - DAC
21.1
266
Features
ATmega32/64/M1/C1
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The ATmega32/64/M1/C1 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 ded-
icated driver.
The DAC has a separate analog supply voltage pin, AV
0.3V from V
pin.
The reference voltage is the same as the one used for the ADC,
– ADMUX” on page
age reference may be externally decoupled at the AREF pin by a capacitor for better noise
performance.
10 bits resolution
8 bits linearity
+/- 0.5 LSB accuracy between 100mV and AVcc-100mV
Vout = DAC*Vref/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 100 Ohms. So the driver is able to load a 1nF
capacitance in parallel with a resistor higher than 33K with a time constant around 1us.
CC
. See the paragraph
241.. These nominally 2.56V Vref or AV
“ADC Noise Canceler” on page 234
CC
. AV
CC
are provided On-chip. The volt-
CC
See “ADC Multiplexer Register
must not differ more than ±
on how to connect this
7647A–AVR–02/08