Rainbow-electronics ATmega64C1 Bedienungsanleitung PDF herunterladen (Seite 266)

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7647A–AVR–02/08

ATmega32/64/M1/C1

21. Digital to Analog Converter - DAC

21.1 Features

• 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.

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

. AV

must not differ more than ±

0.3V from V

. See the paragraph “ADC Noise Canceler” on page 234 on how to connect this

pin.

The reference voltage is the same as the one used for the ADC, See “ADC Multiplexer Register

– ADMUX” on page 241.. These nominally 2.56V Vref or AV

are provided On-chip. The volt-

age reference may be externally decoupled at the AREF pin by a capacitor for better noise

performance.

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