ATmega644PA datasheet(338/468 Pages) ATMEL

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338

8152G–AVR–11/09

ATmega164PA/324PA/644PA/1284P

27.8

ADC Characteristics

Notes:

1. Values are guidelines only.

Table 27-13. ADC Characteristics, Single Ended Channel

Symbol

Parameter

Condition

Min(1)

Typ(1)

Max(1)

Units

Resolution

Single Ended Conversion

Bits

Absolute accuracy (Including

INL, DNL, quantization error,

gain and offset error)

Single Ended Conversion

VREF = 4V, VCC = 4V,

ADC clock = 200 kHz

1.9

LSB

Single Ended Conversion

VREF = 4V, VCC = 4V,

ADC clock = 1 MHz

3.25

Single Ended Conversion

REF = 4V, VCC = 4V,

ADC clock = 200 kHz

Noise Reduction Mode

1.9

Single Ended Conversion

VREF = 4V, VCC = 4V,

ADC clock = 1 MHz

Noise Reduction Mode

3.25

Integral Non-Linearity (INL)

Single Ended Conversion

VREF = 4V, VCC = 4V,

ADC clock = 200 kHz

1.1

Differential Non-Linearity (DNL)

Single Ended Conversion

VREF = 4V, VCC = 4V,

ADC clock = 200 kHz

0.3

Gain Error

Single Ended Conversion

REF = 4V, VCC = 4V,

ADC clock = 200 kHz

1.6

Offset Error

Single Ended Conversion

VREF = 4V, VCC = 4V,

ADC clock = 200 kHz

-1.5

Conversion Time

Free Running Conversion

260

µs

Clock Frequency

Single Ended Conversion

1000

kHz

AVCC

Analog Supply Voltage

CC - 0.3

CC + 0.3

VREF

Reference Voltage

1.0

AVCC

Input Voltage

GND

REF

Input Bandwidth

38.5

kHz

VINT1

Internal Voltage Reference

1.1V

1.0

1.1

1.2

INT2

Internal Voltage Reference

2.56V, V

CC > 2.7V

2.33

2.56

2.79

RREF

Reference Input Resistance

RAIN

Analog Input Resistance

100

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