MC68HC908GR4MP datasheet(263/286 Pages) FREESCALE

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ADC Characteristics

MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7

Freescale Semiconductor

263

23.12 ADC Characteristics

Characteristic(1)

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

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)

2. Source impedances greater than 10 k

Ω adversely affect internal RC charging time during input sampling.

tADS

5—

tAIC cycles

Zero input reading(3)

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

ZADI

Hex

VIN = VREFL

Full-scale reading(3)

FADI

Hex

VIN = VREFH

Input capacitance

CADI

—

Not tested

Input leakage(4)

Port B

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

current.

——

± 1

μA

MC68HC908GR4MP Datasheet(PDF) 263 Page - Freescale Semiconductor, Inc

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