MC908QT4MPE datasheet(161/184 Pages) FREESCALE

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Analog-to-Digital Converter Characteristics

MC68HC908QY/QT Family Data Sheet, Rev. 5

Freescale Semiconductor

161

16.14 Analog-to-Digital Converter Characteristics

Characteristic

Symbol

Min

Max

Unit

Comments

Supply voltage

VDDAD

2.7

(VDD min)

5.5

(VDD max)

V—

Input voltages

VADIN

VSS

VDD

V—

Resolution

(1 LSB)

RES

10.5

21.5

—

Absolute accuracy

(Total unadjusted error)

ETUE

—

± 1.5

LSB

Includes quantization

ADC internal clock

fADIC

0.5

1.048

MHz

tADIC = 1/fADIC,

tested only at 1 MHz

Conversion range

VAIN

VSS

VDD

V—

Power-up time

tADPU

—

tADIC cycles

tADIC = 1/fADIC

Conversion time

tADC

tADIC cycles

tADIC = 1/fADIC

Sample time(1)

1. Source impedances greater than 10 k

Ω adversely affect internal RC charging time during input sampling.

tADS

5—

tADIC cycles

tADIC = 1/fADIC

Zero input reading(2)

2. Zero-input/full-scale reading requires sufficient decoupling measures for accurate conversions.

ZADI

Hex

VIN = VSS

Full-scale reading(3)

FADI

Hex

VIN = VDD

Input capacitance

CADI

—

Not tested

Input leakage(3)

3. The external system error caused by input leakage current is approximately equal to the product of R source and input

current.

IIL

—± 1

µA—

ADC supply current

VDD = 3 V

VDD = 5 V

IADAD

Typical = 0.45

Typical = 0.65

Enabled

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