ATmega88PA Automotive Atmel Corporation, ATmega88PA Automotive Datasheet - Page 248

• Manufacturer Part Number: ATmega88PA Automotive
• Manufacturer: Atmel Corporation

24. Analog-to-Digital Converter
24.1
24.2
248
Features
Overview
Atmel ATmega48PA/88PA/168PA [Preliminary]
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The Atmel
ADC is connected to an 8-channel Analog Multiplexer which allows eight single-ended voltage
inputs constructed from the pins of Port A. 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
24-1 on page
The ADC has a separate analog supply voltage pin, AV
±0.3V from V
this pin.
Internal reference voltages of nominally 1.1V or AV
ence may be externally decoupled at the AREF pin by a capacitor for better noise
performance.
The Power Reduction ADC bit, PRADC, in
be disabled by writing a logical zero to enable the ADC.
The ADC converts an analog input voltage to a 10-bit digital value through successive approx-
imation. The minimum value represents GND and the maximum value represents the voltage
on the AREF pin minus 1 LSB. Optionally, AV
connected to the AREF pin by writing to the REFSn bits in the ADMUX Register. The internal
voltage reference may thus be decoupled by an external capacitor at the AREF pin to improve
noise immunity.
10-bit Resolution
0.5 LSB Integral Non-linearity
± 2 LSB Absolute Accuracy
13 - 260 µs Conversion Time
Up to 76.9 kSPS (Up to 15 kSPS at Maximum Resolution)
6 Multiplexed Single Ended Input Channels
2 Additional Multiplexed Single Ended Input Channels
Temperature Sensor Input Channel
Optional Left Adjustment for ADC Result Readout
0 - V
Selectable 1.1V ADC Reference Voltage
Free Running or Single Conversion Mode
Interrupt on ADC Conversion Complete
Sleep Mode Noise Canceler
CC
ADC Input Voltage Range
®
ATmega48PA/88PA/168PA features a 10-bit successive approximation ADC. The
CC
249.
. See the paragraph
“ADC Noise Canceler” on page 255
“Minimizing Power Consumption” on page 42
CC
or an internal 1.1V reference voltage may be
CC
are provided On-chip. The voltage refer-
CC
. AV
CC
must not differ more than
on how to connect
9223B–AVR–09/11
Figure
must