
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)
VREF = 4V, VCC = 4V,
ADC clock = 200 kHz
2LSB
V
REF = 4V, VCC = 4V,
ADC clock = 1 MHz
3LSB
VREF = 4V, VCC = 4V,
ADC clock = 200 kHz
Noise Reduction Mode
1.5
LSB
V
REF = 4V, VCC = 4V,
ADC clock = 1 MHz
Noise Reduction Mode
2.5
LSB
Integral Non-Linearity (INL)
(Accuracy after Offset and
Gain Calibration)
VREF = 4V, VCC = 4V,
ADC clock = 200 kHz
1LSB
Differential Non-linearity (DNL)
V
REF = 4V, VCC = 4V,
ADC clock = 200 kHz
0.5
LSB
Gain Error
VREF = 4V, VCC = 4V,
ADC clock = 200 kHz
2.5
LSB
Offset Error
VREF = 4V, VCC = 4V,
ADC clock = 200 kHz
1.5
LSB
Conversion Time
Free Running Conversion
13
260
s
Clock Frequency
50
1000
kHz
AVCC
Analog Supply Voltage
V
CC - 0.3
V
CC + 0.3
V
AREF
External Voltage Reference
2.0
AVCC
V
VIN
Input Voltage
GND
VREF
Input Bandwidth
38.5
kHz
VINT
Internal 1.1V Reference
1.0
1.1
1.2
V
Internal 2.56V Reference
VCC > 3.0V
2.3
2.56
2.8
V
RREF
Reference Input Resistance
35
k
Ω
RAIN
Analog Input Resistance
100
M
Ω
ADC Conversion Output
0
1023
LSB