MB89663 datasheet(35/48 Pages) FUJITSU

35 / 48 page

MB89660 Series

5. A/D Converter Electrical Characteristics

(AVCC = VCC = +3.5 V to 6.0 V, AVSS = VSS = 0.0 V, TA = –40

°C to +85°C)

* : For information on tinst, see “(4) Instruction Cycle” in “4. AC Characteristics.”

(1) A/D Glossary

• Resolution

Analog changes that are identifiable with the A/D converter.

When the number of bits is 8, analog voltage can be divided into 28 = 256.

• Linearity error (unit: LSB)

The deviation of the straight line connecting the zero transition point (“0000 0000”

↔ “0000 0001”) with the

full-scale transition point (“1111 1111”

↔ “1111 1110”) from actual conversion characteristics

• Differential linearity error (unit: LSB)

The deviation of input voltage needed to change the output code by 1 LSB from the theoretical value

• Total error (unit: LSB)

The difference between theoretical and actual conversion values

Parameter

Symbol

Condition

Value

Unit

Remarks

Min.

Typ.

Max.

Resolution

—

——

—

bit

Total error

AVR = AVCC

——

±2.0

LSB

Linearity error

—

±1.0

LSB

Differential linearity error

—

±0.9

LSB

Zero transition voltage

VOT

AVSS –

1.5 LSB

AVSS+

0.5 LSB

AVSS+

2.5 LSB

Full-scale transition

voltage

VFST

AVR –

3.5 LSB

AVR –

1.5 LSB

AVR +

0.5 LSB

Interchannel disparity

—

——

LSB

A/D mode conversion time

—

44 tisnt*—

µs

Sense mode conversion

time

—

12 tinst*—

µs

Analog port input circuit

IAIN

AN0 to AN7

——

µA

Analog input voltage

—

0—

AVR

Reference voltage

AVR

0—

AVCC

Reference voltage

supply current

AVR = 5.0 V

when A/D

conversion is

activated

—150

—

µA

IRH

AVR = 5.0 V

when A/D

conversion is

stopped

——

µA

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