Datasheet

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