
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)
VREF = 4V, VCC = 4V,
ADC clock = 200kHz
2
LSB
V
REF = 4V, VCC = 4V,
ADC clock = 1MHz
4.5
VREF = 4V, VCC = 4V,
ADC clock = 200kHz
Noise reduction mode
2
V
REF = 4V, VCC = 4V,
ADC clock = 1MHz
Noise reduction mode
4.5
Integral non-linearity (INL)
V
REF = 4V, VCC = 4V,
ADC clock = 200kHz
0.5
Differential non-linearity (DNL)
VREF = 4V, VCC = 4V,
ADC clock = 200kHz
0.25
Gain error
VREF = 4V, VCC = 4V,
ADC clock = 200kHz
2
Offset error
V
REF = 4V, VCC = 4V,
ADC clock = 200kHz
2
Conversion time
Free running conversion
13
260
s
Clock frequency
50
1000
kHz
AVCC
Analog supply voltage
VCC - 0.3
VCC + 0.3
V
VREF
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
RREF
Reference input resistance
32
k
Ω
RAIN
Analog input resistance
100
M
Ω