ATmega128 datasheet(325/386 Pages) ATMEL

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325

2467S–AVR–07/09

ATmega128

ADC Characteristics

Notes:

1. Values are guidelines only.

2. Minimum for AVCC is 2.7V.

3. Maximum for AVCC is 5.5V

Table 135. ADC Characteristics, Single Ended Channels

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

1.5

LSB

Single Ended Conversion

VREF = 4V, VCC = 4V

ADC clock = 1 MHz

3.25

LSB

Single Ended Conversion

VREF = 4V, VCC = 4V

ADC clock = 200 kHz

Noise Reduction mode

1.5

LSB

Single Ended Conversion

VREF = 4V, VCC = 4V

ADC clock = 1 MHz

Noise Reduction mode

3.75

LSB

Integral Non-Linearity (INL)

Single Ended Conversion

REF = 4V, VCC = 4V

ADC clock = 200 kHz

0.75

LSB

Differential Non-Linearity (DNL)

Single Ended Conversion

REF = 4V, VCC = 4V

ADC clock = 200 kHz

0.5

LSB

Gain Error

Single Ended Conversion

REF = 4V, VCC = 4V

ADC clock = 200 kHz

1LSB

Offset error

Single Ended Conversion

REF = 4V, VCC = 4V

ADC clock = 200 kHz

1LSB

Clock Frequency

1000

kHz

Conversion Time

260

µs

AVCC

Analog Supply Voltage

VCC - 0.3

(2)

VCC + 0.3

(3)

VREF

Reference Voltage

2.0

AVCC

Input Voltage

GND

REF

Input Bandwidth

38.5

kHz

INT

Internal Voltage Reference

2.3

2.56

2.7

RREF

Reference Input Resistance

RAIN

Analog Input Resistance

100

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