Datasheet

190
8197C–AVR–05/11
ATtiny261A/461A/861A
19.6 ADC Characteristics
Table 19-7. ADC Characteristics, Single Ended Channels. T = -40°C to +85°C
Symbol Parameter Condition Min Typ Max Units
Resolution 10 Bits
Absolute accuracy
(Including INL, DNL, and
Quantization, Gain and Offset
Errors)
V
REF
= 4V, V
CC
= 4V,
ADC clock = 200 kHz
2LSB
V
REF
= 4V, V
CC
= 4V,
ADC clock = 1 MHz
3LSB
V
REF
= 4V, V
CC
= 4V,
ADC clock = 200 kHz
Noise Reduction Mode
1.5 LSB
V
REF
= 4V, V
CC
= 4V,
ADC clock = 1 MHz
Noise Reduction Mode
2.5 LSB
Integral Non-Linearity (INL)
(Accuracy after Offset and
Gain Calibration)
V
REF
= 4V, V
CC
= 4V,
ADC clock = 200 kHz
1LSB
Differential Non-linearity (DNL)
V
REF
= 4V, V
CC
= 4V,
ADC clock = 200 kHz
0.5 LSB
Gain Error
V
REF
= 4V, V
CC
= 4V,
ADC clock = 200 kHz
2.5 LSB
Offset Error
V
REF
= 4V, V
CC
= 4V,
ADC clock = 200 kHz
1.5 LSB
Conversion Time Free Running Conversion 13 260 µs
Clock Frequency 50 1000 kHz
AV
CC
Analog Supply Voltage V
CC
- 0.3 V
CC
+ 0.3 V
A
REF
External Voltage Reference 2.0 AVCC V
V
IN
Input Voltage GND V
REF
Input Bandwidth 38.5 kHz
V
INT
Internal 1.1V Reference 1.0 1.1 1.2 V
Internal 2.56V Reference V
CC
> 3.0V 2.3 2.56 2.8 V
R
REF
Reference Input Resistance 35 kΩ
R
AIN
Analog Input Resistance 100 MΩ
ADC Conversion Output 0 1023 LSB