Datasheet

311
2545T–AVR–05/11
ATmega48/88/168
29.8 ADC characteristics
Note: 1. AV
CC
absolute min./max.: 1.8V/5.5V
Table 29-7. ADC characteristics.
Symbol Parameter Condition Minimum Typical Maximum Units
Resolution 10 Bits
Absolute accuracy (Including
INL, DNL, quantization error,
gain and offset error)
V
REF
= 4V, V
CC
= 4V,
ADC clock = 200kHz
2
LSB
V
REF
= 4V, V
CC
= 4V,
ADC clock = 1MHz
4.5
V
REF
= 4V, V
CC
= 4V,
ADC clock = 200kHz
Noise reduction mode
2
V
REF
= 4V, V
CC
= 4V,
ADC clock = 1MHz
Noise reduction mode
4.5
Integral non-linearity (INL)
V
REF
= 4V, V
CC
= 4V,
ADC clock = 200kHz
0.5
Differential non-linearity (DNL)
V
REF
= 4V, V
CC
= 4V,
ADC clock = 200kHz
0.25
Gain error
V
REF
= 4V, V
CC
= 4V,
ADC clock = 200kHz
2
Offset error
V
REF
= 4V, V
CC
= 4V,
ADC clock = 200kHz
2
Conversion time Free running conversion 13 260 µs
Clock frequency 50 1000 kHz
AV
CC
(1)
Analog supply voltage V
CC
- 0.3 V
CC
+ 0.3
VV
REF
Reference voltage 1.0 AV
CC
V
IN
Input voltage GND V
REF
Input bandwidth 38.5 kHz
V
INT
Internal voltage reference 1.0 1.1 1.2 V
R
REF
Reference input resistance 32 kΩ
R
AIN
Analog input resistance 100 MΩ