Atmel ATmega128, Manual

Page: 326 / 386

326
2467S–AVR–07/09
ATmega128
Table 136. ADC Characteristics, Differential Channels
Symbol Parameter Condition Min
(1)
Typ
(1)
Max
(1)
Units
Resolution
Gain = 1x 10 Bits
Gain = 10x 10 Bits
Gain = 200x 10 Bits
Absolute Accuracy
Gain = 1x
V
REF
= 4V, V
CC
= 5V
ADC clock = 50 - 200 kHz
17 LSB
Gain = 10x
V
REF
= 4V, V
CC
= 5V
ADC clock = 50 - 200 kHz
17 LSB
Gain = 200x
V
REF
= 4V, V
CC
= 5V
ADC clock = 50 - 200 kHz
7 LSB
Integral Non-Linearity (INL)
(Accuracy after Calibration for Offset and
Gain Error)
Gain = 1x
V
REF
= 4V, V
CC
= 5V
ADC clock = 50 - 200 kHz
1.5 LSB
Gain = 10x
V
REF
= 4V, V
CC
= 5V
ADC clock = 50 - 200 kHz
2 LSB
Gain = 200x
V
REF
= 4V, V
CC
= 5V
ADC clock = 50 - 200 kHz
5 LSB
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 - 200 kHz
2 LSB
Gain = 10x
V
REF
= 4V, V
CC
= 5V
ADC clock = 50 - 200 kHz
3 LSB
Gain = 200x
V
REF
= 4V, V
CC
= 5V
ADC clock = 50 - 200 kHz
4 LSB
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
V
IN
Input Voltage GND V
CC
V
V
DIFF
Input Differential Voltage -V
REF
/Gain V
REF
/Gain V
ADC Conversion Output -511 511 LSB
Input Bandwidth 4 kHz