
192
8197C–AVR–05/11
ATtiny261A/461A/861A
Notes:
1. VDIFF must be below VREF.
Table 19-9.
ADC Characteristics, Differential Channels (Bipolar Mode). T = -40
°C to +85°C
Symbol
Parameter
Condition
Min
Typ
Max
Units
Resolution
Gain = 1x / 8x / 20x / 32x
10
Bits
Absolute accuracy
(Including INL, DNL, and
Quantization, Gain and Offset
Errors)
Gain = 1x / 8x
V
REF = 4V, VCC = 5V
ADC clock = 50 - 200 kHz
8LSB
Gain = 20x / 32x
V
REF = 4V, VCC = 5V
ADC clock = 50 - 200 kHz
8LSB
Integral Non-Linearity (INL)
(Accuracy after Offset and
Gain Calibration)
Gain = 1x / 8x
V
REF = 4V, VCC = 5V
ADC clock = 50 - 200 kHz
4LSB
Gain = 20x / 32x
V
REF = 4V, VCC = 5V
ADC clock = 50 - 200 kHz
5LSB
Gain Error
Gain = 1x / 8x
4
LSB
Gain = 20x / 32x
5
LSB
Offset Error
Gain = 1x / 8x
VREF = 4V, VCC = 5V
ADC clock = 50 - 200 kHz
3LSB
Gain = 20x / 32x
VREF = 4V, VCC = 5V
ADC clock = 50 - 200 kHz
4LSB
Conversion Time
Free Running Conversion
65
260
s
Clock Frequency
50
200
kHz
VIN
Input Voltage
GND
AV
CC
V
VDIFF
Input Differential Voltage
VREF/Gain
V
Input Bandwidth
4
kHz
AVCC
Analog Supply Voltage
V
CC - 0.3
V
CC + 0.3
V
AREF
External Voltage Reference
2.0
AVCC - 1.0
V
VINT
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
RREF
Reference Input Resistance
35
k
Ω
RAIN
Analog Input Resistance
100
M
Ω
ADC Conversion Output
-512
511
LSB