28.8 ADC Characteristics
Table 28-7. ADC Characteristics
Symbol
Parameter
Condition
Min
Typ
Max
Units
Resolution
10
Bits
VREF = 4V, VCC = 4V,
ADC clock = 200 kHz
2
LSB
LSB
VREF = 4V, VCC = 4V,
ADC clock = 1 MHz
4.5
Absolute accuracy (Including
INL, DNL, quantization error,
gain and offset error)
VREF = 4V, VCC = 4V,
ADC clock = 200 kHz
2
LSB
LSB
Noise Reduction Mode
VREF = 4V, VCC = 4V,
ADC clock = 1 MHz
Noise Reduction Mode
4.5
VREF = 4V, VCC = 4V,
ADC clock = 200 kHz
Integral Non-Linearity (INL)
0.5
0.25
2
LSB
LSB
LSB
LSB
Differential Non-Linearity
(DNL)
VREF = 4V, VCC = 4V,
ADC clock = 200 kHz
VREF = 4V, VCC = 4V,
Gain Error
ADC clock = 200 kHz
VREF = 4V, VCC = 4V,
ADC clock = 200 kHz
Offset Error
2
Conversion Time
Free Running Conversion
13
50
260
1000
µs
kHz
V
Clock Frequency
(1)
AVCC
Analog Supply Voltage
Reference Voltage
VCC - 0.3
1.0
VCC + 0.3
AVCC
VREF
VIN
V
Input Voltage
GND
VREF
V
Input Bandwidth
38.5
1.1
kHz
V
VINT
RREF
RAIN
Internal Voltage Reference
Reference Input Resistance
Analog Input Resistance
1.0
1.2
32
kΩ
MΩ
100
Note:
1. AVCC absolute min/max: 1.8V/5.5V
312
ATmega48/88/168
2545M–AVR–09/07
ATMEL [ ATMEL ]
