Datasheet

382
ATmega640/1280/1281/2560/2561
2549K–AVR–01/07
ADC Characteristics – Preliminary Data
Notes: 1. Values are guidelines only.
Table 170. ADC Characteristics, Singel Ended Channels
Symbol Parameter Condition Min
(1)
Typ
(1)
Max
(1)
Units
Resolution Single Ended Conversion 10 Bits
Absolute accuracy (Including
INL, DNL, quantization error,
gain and offset error)
Single Ended Conversion
V
REF
= 4V, V
CC
= 4V,
CLK
ADC
= 200 kHz
2.25
(2)
2.5 LSB
Single Ended Conversion
V
REF
= 4V, V
CC
= 4V,
CLK
ADC
= 1 MHz
3LSB
Single Ended Conversion
V
REF
= 4V, V
CC
= 4V,
CLK
ADC
= 200 kHz
Noise Reduction Mode
2LSB
Single Ended Conversion
V
REF
= 4V, V
CC
= 4V,
CLK
ADC
= 1 MHz
Noise Reduction Mode
3
(2.75)
LSB
Integral Non-Linearity (IN L)
Single Ended Conversion
V
REF
= 4V, V
CC
= 4V,
CLK
ADC
= 200 kHz
1.25
(1.0)
LSB
Differential Non-Linearity (DNL)
Single Ended Conversion
V
REF
= 4V, V
CC
= 4V,
CLK
ADC
= 200 kHz
0.5
(0.25)
LSB
Gain Error
Single Ended Conversion
V
REF
= 4V, V
CC
= 4V,
CLK
ADC
= 200 kHz
2
(1.75)
LSB
Offset Error
Single Ended Conversion
V
REF
= 4V, V
CC
= 4V,
CLK
ADC
= 200 kHz
-2
(-1.75)
LSB
Conversion Time Free Running Conversion 13 260 µs
Clock Frequency Single Ended Conversion 50 1000 kHz
AVCC Analog Supply Voltage V
CC
- 0.3 V
CC
+ 0.3 V
V
REF
Reference Voltage 1.0 AVCC V
V
IN
Input Voltage GNDV
REF
V
Input Bandwidth 38,5 kHz
V
INT1
Internal Voltage Reference 1.1V 1.0 1.1 1.2 V
V
INT2
Internal Voltage Reference 2.56V 2.4 2.56 2.8 V
R
REF
Reference Input Resistance 32 kΩ
R
AIN
Analog Input Resistance 100 MΩ