ATMEGA1284-PU Atmel, ATMEGA1284-PU Datasheet - Page 241
![IC MCU AVR 128K FLASH 40PDIP](/photos/6/70/67049/453-40-dip_sml.jpg)
ATMEGA1284-PU
Manufacturer Part Number
ATMEGA1284-PU
Description
IC MCU AVR 128K FLASH 40PDIP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA1284-PU
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
128KB (64K x 16)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
16K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
40-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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22. ADC - Analog-to-digital Converter
22.1
22.2
8272A–AVR–01/10
Features
Overview
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Note:
The ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P features a 10-bit successive
approximation ADC. The ADC is connected to an 8-channel Analog Multiplexer which allows 8
single-ended voltage inputs constructed from the pins of Port A. The single-ended voltage inputs
refer to 0V (GND).
The device also supports 16 differential voltage input combinations. Two of the differential inputs
(ADC1, ADC0 and ADC3, ADC2) are equipped with a programmable gain stage. This provides
amplification steps of 0 dB (1x), 20 dB (10x), or 46 dB (200x) on the differential input voltage
before the A/D conversion. Seven differential analog input channels share a common negative
terminal (ADC1), while any other ADC input can be selected as the positive input terminal. If 1x
or 10x gain is used, 8-bit resolution can be expected. If 200x gain is used, 6-bit resolution can be
expected. Note that internal references of 1.1V should not be used on 10x and 200x gain.
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
on page
The ADC has a separate analog supply voltage pin, AVCC. AVCC must not differ more than
±0.3 V from V
pin.
Internal reference voltages of nominally 1.1V, 2.56V or AVCC are provided On-chip. The voltage
reference may be externally decoupled at the AREF pin by a capacitor for better noise perfor-
mance. If V
ended channels.
164A/164PA/324A/324PA/644A/644PA/1284/1284P
10-bit Resolution
0.5 LSB Integral Non-linearity
±2 LSB Absolute Accuracy
13 - 260 µs Conversion Time
Up to 15 kSPS at Maximum Resolution
8 Multiplexed Single Ended Input Channels
Differential mode with selectable gain at 1x, 10x or 200x
Optional Left adjustment for ADC Result Readout
0 - V
2.7 - V
Selectable 2.56V or 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
CC
1. The differential input channels are not tested for devices in PDIP Package. This feature is only
242.
ADC Input Voltage Range
Differential ADC Voltage Range
guaranteed to work for devices in TQFP, VQFN/QFN/MLF, VFBGA and DRQFN Packages.
CC
CC
is below 2.1V, internal voltage reference of 1.1V should not be used on single
. See the paragraph
”ADC Noise Canceler” on page 249
on how to connect this
Figure 22-1
241
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