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ATmega128
Table 136. ADC Characteristics, Differential Channels
Symbol
Parameter
Condition
Min (1)
Typ (1)
Max (1)
Units
Gain =
1x
10
Resolution
Gain = 10x
Gain = 200x
10
10
Bits
Gain = 1x
V REF = 4V, V CC = 5V
ADC clock = 50 - 200kHz
Gain = 10x
17
Absolute Accuracy
V REF = 4V, V CC = 5V
ADC clock = 50 - 200kHz
Gain = 200x
V REF = 4V, V CC = 5V
17
7
ADC clock = 50 - 200kHz
LSB
Gain = 1x
V REF = 4V, V CC = 5V
ADC clock = 50 - 200kHz
1.5
Integral Non-Linearity (INL)
Gain = 10x
(Accuracy after Calibration for Offset and
Gain Error)
V REF = 4V, V CC = 5V
ADC clock = 50 - 200kHz
Gain = 200x
V REF = 4V, V CC = 5V
ADC clock = 50 - 200kHz
2
5
Gain =
1x
1.5
Gain Error
Gain = 10x
Gain = 200x
1.5
0.5
%
Gain = 1x
V REF = 4V, V CC = 5V
ADC clock = 50 - 200kHz
Gain = 10x
2
Offset Error
V REF = 4V, V CC = 5V
3
LSB
ADC clock = 50 - 200kHz
Gain = 200x
V REF = 4V, V CC = 5V
ADC clock = 50 - 200kHz
4
Clock Frequency
Conversion Time
50
65
200
260
kHz
μs
V CC + 0.3
AVCC
Analog Supply Voltage
V CC - 0.3 (2)
(3)
V REF
V IN
V DIFF
Reference Voltage
Input Voltage
Input Differential Voltage
ADC Conversion Output
Input Bandwidth
2.0
GND
-V REF /Gain
-511
4
AVCC - 0.5
V CC
V REF /Gain
511
V
LSB
kHz
326
2467X–AVR–06/11
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