ATmega48/88/168
ADC Characteristics – Preliminary Data
Table 135. ADC Characteristics
Symbol
Parameter
Condition
Min
Typ
Max
Units
Resolution
10
Bits
VREF = 4V, VCC = 4V,
ADC clock = 200 kHz
2
2.5
LSB
LSB
VREF = 4V, VCC = 4V,
ADC clock = 1 MHz
4.5
Absolute accuracy (Including
INL, DNL, quantization error,
gain and offset error)
VREF = 4V, VCC = 4V,
ADC clock = 200 kHz
2
LSB
LSB
Noise Reduction Mode
VREF = 4V, VCC = 4V,
ADC clock = 1 MHz
Noise Reduction Mode
4.5
VREF = 4V, VCC = 4V,
ADC clock = 200 kHz
Integral Non-Linearity (INL)
Differential Non-Linearity (DNL)
Gain Error
0.5
0.25
2
LSB
LSB
LSB
LSB
VREF = 4V, VCC = 4V,
ADC clock = 200 kHz
VREF = 4V, VCC = 4V,
ADC clock = 200 kHz
VREF = 4V, VCC = 4V,
ADC clock = 200 kHz
Offset Error
2
Conversion Time
Free Running Conversion
13
50
260
1000
µs
kHz
V
Clock Frequency
AVCC
VREF
VIN
Analog Supply Voltage
Reference Voltage
VCC - 0.3
1.0
VCC + 0.3
AVCC
VREF
V
Input Voltage
GND
V
Input Bandwidth
38.5
1.1
kHz
V
VINT
RREF
RAIN
Internal Voltage Reference
Reference Input Resistance
Analog Input Resistance
1.0
1.2
32
kΩ
MΩ
100
Note:
All DC Characteristics contained in this datasheet are based on simulation and characterization of other AVR microcontrollers
manufactured in the same process technology. These values are preliminary values representing design targets, and will be
updated after characterization of actual silicon.
297
2545D–AVR–07/04
ATMEL [ ATMEL ]
