ATMEGA3208 datasheet(19/68 Pages) MICROCHIP

19 / 68 page

Symbol(2)

Description

Condition

Min.

Typ.

Max.

Unit

INT15V

INT25V

INT055V

INT11V

INT15V

INT25V

INT43V

Internal reference voltage

VDD=[1.8V, 5.5V]

T=[-40 - 125]°C

-5.0

5.0

Note:

These values are based on characterization and not covered by production test limits.

The symbols INTxxV refer to the respective values of the AC0REFSEL bit field in the VREF.CTRLA

5.11

ADC

5.11.1

Internal Reference Characteristics

Operating conditions:

•

VDD = 1.8 to 5.5V

•

Temperature = -40°C to 125°C

•

DUTYCYC = 25%

•

CLKADC = 13 * fADC

•

SAMPCAP is 10 pF for 0.55V reference, while it is set to 5 pF for VREF≥1.1V

•

Applies for all allowed combinations of VREF selections and Sample Rates unless otherwise noted

Table 5-20. Power Supply, Reference, and Input Range

Symbol

Description

Conditions

Min.

Typ.

Max.

Unit

VDD

Supply voltage

CLKADC ≤ 1.5 MHz

1.8

5.5

CLKADC > 1.5 MHz

2.7

5.5

VREF

Reference voltage

REFSEL = Internal reference

0.55

VDD-0.5

REFSEL = External reference

1.1

VDD

REFSEL = VDD

1.8

5.5

CIN

Input capacitance

SAMPCAP=5 pF

SAMPCAP=10 pF

VIN

Input voltage range

VREF

IBAND

Input bandwidth

1.1V≤VREF

57.5

kHz

ATmega3208/4808 – 32-pin Data Sheet

Electrical Characteristics

Datasheet Preliminary

DS40002017A-page 19

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