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AT90PWM2 Datasheet(PDF) 266 Page - ATMEL Corporation |
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AT90PWM2 Datasheet(HTML) 266 Page - ATMEL Corporation |
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266 / 365 page  266 AT90PWM2/3 4317B–AVR–02/05 Digital to Analog Converter - DAC 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 lower than 1KOhms. 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 AT90PWM2/3 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. AVCC must not differ more than ± 0.3V from V CC. See the paragraph “ADC Noise Canceler” on page 250 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 257.. These nominally 2.56V Vref 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. |
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