Datasheet

297
ATmega325/3250/645/6450
2570K–AVR–04/07
Note: 1. Voltage difference between channels
Calibrated Internal RC Oscillator Accuracy
Notes: 1. Voltage range for ATmega325V/3250V/645V/6450V.
2. Voltage range for ATmega325/3250/645/6450.
V
INT
Internal Voltage Reference 1.0 1.1 1.2 V
R
REF
Reference Input Resistance 32 kΩ
R
AIN
Analog Input Resistance 100 MΩ
Table 125. ADC Characteristics
Symbol Parameter Condition Min Typ Max Units
Table 126. Calibration Accuracy of Internal RC Oscillator
Frequency V
CC
Temperature Calibration Accuracy
Factory
Calibration
8.0 MHz 3V 25°C±10%
User
Calibration
7.3 - 8.1 MHz
1.8V - 5.5V
(1)
2.7V - 5.5V
(2)
-40°C - 85°C±1%