ATmega640/1280/1281/2560/2561
31.8 ADC Characteristics – Preliminary Data
Table 31-7. ADC Characteristics, Singel Ended Channels
Symbol
Parameter
Condition
Min(1)
Typ(1)
Max(1)
Units
Resolution
Single Ended Conversion
10
Bits
Single Ended Conversion
VREF = 4V, VCC = 4V,
CLKADC= 200 kHz
2.25
3
2.5
LSB
LSB
Single Ended Conversion
VREF = 4V, VCC = 4V,
CLKADC = 1 MHz
Absolute accuracy (Including
INL, DNL, quantization error,
gain and offset error)
Single Ended Conversion
VREF = 4V, VCC = 4V,
2
3
LSB
LSB
CLKADC = 200 kHz
Noise Reduction Mode
Single Ended Conversion
VREF = 4V, VCC = 4V,
CLKADC = 1 MHz
Noise Reduction Mode
Single Ended Conversion
VREF = 4V, VCC = 4V,
CLKADC = 200 kHz
Integral Non-Linearity (INL)
Differential Non-Linearity (DNL)
Gain Error
1.25
0.5
2
LSB
LSB
LSB
LSB
Single Ended Conversion
VREF = 4V, VCC = 4V,
CLKADC = 200 kHz
Single Ended Conversion
VREF = 4V, VCC = 4V,
CLKADC= 200 kHz
Single Ended Conversion
Offset Error
VREF = 4V, VCC = 4V,
-2
CLKADC = 200 kHz
Conversion Time
Free Running Conversion
Single Ended Conversion
13
50
260
1000
µs
kHz
V
Clock Frequency
AVCC
VREF
VIN
Analog Supply Voltage
Reference Voltage
VCC - 0.3
1.0
VCC + 0.3
AVCC
VREF
V
Input Voltage
GND
V
Input Bandwidth
38,5
1.1
kHz
V
VINT1
VINT2
RREF
RAIN
Internal Voltage Reference
Internal Voltage Reference
Reference Input Resistance
Analog Input Resistance
1.1V
1.0
2.4
1.2
2.8
2.56V
2.56
32
V
kΩ
MΩ
100
Note:
1. Values are guidelines only.
379
2549L–AVR–08/07
ATMEL [ ATMEL ]
