M68ICS08GR datasheet(378/408 Pages) FREESCALE

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Electrical Specifications

Technical Data

MC68HC908GR8 — Rev 4.0

378

Electrical Specifications

MOTOROLA

23.12 ADC Characteristics

Characteristic(1)

Symbol

Min

Max

Unit

Comments

Supply voltage

VDDAD

2.7

(VDD

min)

5.5

(VDD

max)

VDDAD should be tied

to the same potential

as VDD via separate

traces.

Input voltages

VADIN

VDDAD

VADIN <= VREFH

Resolution

BAD

Bits

Absolute accuracy

(VREFL = 0 V, VDDAD = VREFH =

5 V

± 10%)

AAD

−−

± 1

LSB

Includes quantization

ADC internal clock

fADIC

0.5

1.048

MHz

tAIC = 1/fADIC, tested

only at 1 MHz

Conversion range

RAD

VREFL

VREFH

VREFH = VDDAD

VREFL = VSSAD

Power-up time

tADPU

tAIC cycles

Conversion time

tADC

tAIC cycles

Sample time(2)

tADS

—

tAIC

cycles

Zero input reading(3)

ZADI

Hex

VIN = VREFL

Full-scale reading(3)

FADI

Hex

VIN = VREFH

Input capacitance

CADI

—

(20) 8

Not tested

Input leakage(4)

Port B

——

± 1

µA

Notes:

1. VDD = 5.0 Vdc ± 10%, VSS = 0 Vdc, VDDAD = 5.0 Vdc ± 10%, VSSAD = 0 Vdc, VREFH = 5.0 Vdc ± 10%, VREFL = 0

2. Source impedances greater than 10 k

Ω adversely affect internal RC charging time during input sampling.

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

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

current.

Freescale Semiconductor, Inc.

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