Datasheet

336
7674F–AVR–09/09
ATmega164P/324P/644P
26.7 ADC Characteristics
Notes: 1. On ATmega644P, offset gain and TUE will be higher if not using idle mode.
Table 26-8. ADC Characteristics, Single Ended Channel
Symbol Parameter Condition Min
(1)
Typ
(1)
Max
(1)
Units
Resolution Single Ended Conversion 10 Bits
TUE
Absolute accuracy (Including
INL, DNL, quantization error,
gain and offset error)
Single Ended
Conversion
(1)
V
REF
= 4V, V
CC
= 4V,
ADC clock = 200 kHz
2.5 4
LSB
Single Ended Conversion
V
REF
= 4V, V
CC
= 4V,
ADC clock = 200 kHz
Noise Reduction Mode
2.5 4
INL Integral Non-Linearity
Single Ended Conversion
V
REF
= 4V, V
CC
= 4V,
ADC clock = 200 kHz
0.5 1.5
DNL Differential Non-Linearity
Single Ended Conversion
V
REF
= 4V, V
CC
= 4V,
ADC clock = 200 kHz
0.3 0.7
Gain Error
Single Ended
Conversion
(1)
V
REF
= 4V, V
CC
= 4V,
ADC clock = 200 kHz
-4 -2 4
Offset Error
Single Ended
Conversion
(1)
V
REF
= 4V, V
CC
= 4V,
ADC clock = 200 kHz
-4 2 4
Conversion Time Free Running Conversion 65 260 µs
Clock Frequency Single Ended Conversion 50 200 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 GND V
REF
V
V
INT1
Internal Voltage Reference 1.1V 1.0 1.1 1.2 V
V
INT2
Internal Voltage Reference 2.56V 2.33 2.56 2.79 V
R
REF
Reference Input Resistance 30 kΩ
R
AIN
Analog Input Resistance 100 MΩ