MB89913 datasheet(38/53 Pages) FUJITSU

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MB89910 Series

5. A/D Converter Electrical Characteristics

(VCC = +3.8 V to +5.5 V, F = 8 MHz, AVSS = VSS = 0.0 V, TA = –40

°C to +85°C)

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

6. A/D Converter 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 drawn 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

Sym-

bol

Pin name

Condition

Value

Unit Remar

Min.

Typ.

Max.

Resolution

——

—

——

bit

Total error

—

±3.0

LSB

Linearity error

—

±1.0

LSB

Differential linearity

error

——

±0.9

LSB

Zero transition voltage

VOT

AN0 to

AN7

AVSS – 1.5

LSB

AVSS +0.5

LSB

AVSS + 2.5

LSB

Full-scale transition

voltage

VFST

AN0 to

AN7

AVR – 3.5

LSB

AVR – 1.5

LSB

AVR +0.5

LSB

Interchannel disparity

——

—

1.0

LSB

A/D mode conversion

time

—

44 tinst*—

µs

Sense mode

conversion time

—

12 tinst*—

µs

Analog port input

current

IAIN

AN0 to

AN7

AVR = VCC = 5.0

——

µA

Analog input voltage

—

AN0 to

AN7

—

0.0

—

AVR

Reference voltage

AVR

3.4

—

AVCC

Reference voltage

supply current

AVR

AVR = 5.0 V

—

200

—

µA

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