ATMEGA325-16AJ ATMEL [ATMEL Corporation], ATMEGA325-16AJ Datasheet - Page 193

• Manufacturer Part Number: ATMEGA325-16AJ
• Description: 8-bit Microcontroller with In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

Analog to Digital
Converter
Features
2570A–AVR–09/04
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The ATmega325/3250/645/6450 features a 10-bit successive approximation ADC. The
ADC is connected to an 8-channel Analog Multiplexer which allows eight single-ended
voltage inputs constructed from the pins of Port F. The single-ended voltage inputs refer
to 0V (GND).
The ADC contains a Sample and Hold circuit which ensures that the input voltage to the
ADC is held at a constant level during conversion. A block diagram of the ADC is shown
in Figure 83.
The ADC has a separate analog supply voltage pin, AVCC. AV
than ± 0.3V from V
connect this pin.
Internal reference voltages of nominally 1.1V or AVCC are provided On-chip. The volt-
age reference may be externally decoupled at the AREF pin by a capacitor for better
noise performance.
The Power Reduction ADC bit, PRADC, in “Power Reduction Register” on page 35 must
be disabled by writing a logical zero to be able to use the ADC module.
10-bit Resolution
0.5 LSB Integral Non-linearity
± 2 LSB Absolute Accuracy
13 µs - 260 µs Conversion Time (50 kHz to 1 MHz ADC clock)
Up to 15 kSPS at Maximum Resolution (200 kHz ADC clock)
Eight Multiplexed Single Ended Input Channels
Optional Left Adjustment for ADC Result Readout
0 - V
Selectable 1.1V ADC Reference Voltage
Free Running or Single Conversion Mode
ADC Start Conversion by Auto Triggering on Interrupt Sources
Interrupt on ADC Conversion Complete
Sleep Mode Noise Canceler
CC
ADC Input Voltage Range
CC
. See the paragraph “ADC Noise Canceler” on page 199 on how to
ATmega325/3250/645/6450
CC
must not differ more
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