ATMEGA4808 datasheet(20/68 Pages) MICROCHIP

20 / 68 page

Table 5-21. Clock and Timing Characteristics

Symbol Description

Conditions

Min. Typ. Max. Unit

fADC

Sample rate

1.1V≤VREF

115

ksps

1.1V≤VREF (8-bit resolution)

150

VREF=0.55V (10 bits)

7.5

CLKADC Clock frequency

VREF=0.55V (10 bits)

100 -

260

kHz

1.1V≤VREF (10 bits)

200 -

1500

1.1V≤VREF (8-bit resolution)

200 -

2000

Sampling time

CLKADC cycles

TCONV

Conversion time (latency)

Sampling time = 2 CLKADC

8.7

µs

TSTART

Start-up time

Internal VREF

µs

Table 5-22. Accuracy Characteristics Internal Reference(2)

Symbol Description

Conditions

Min.

Typ.

Max.

Unit

Res

Resolution

bit

INL

Integral Non-

linearity

REFSEL =

INTERNAL

VREF=0.55V

fADC=7.7 ksps

1.0

LSB

REFSEL =

INTERNAL or VDD

fADC=15 ksps

1.0

REFSEL =

INTERNAL or VDD

1.1V≤VREF

fADC=77 ksps

1.0

fADC=115 ksps

1.2

DNL(1)

Differential

Non-linearity

REFSEL =

INTERNAL

VREF = 0.55V

fADC=7.7 ksps

0.6

LSB

REFSEL =

INTERNAL

VREF = 1.1V

fADC=15 ksps

0.4

REFSEL =

INTERNAL or VDD

1.5V≤VREF

fADC=15 ksps

0.4

REFSEL =

INTERNAL or VDD

1.1V≤VREF

fADC=77 ksps

0.4

ATmega3208/4808 – 32-pin Data Sheet

Electrical Characteristics

Datasheet Preliminary

DS40002017A-page 20

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