MB89P677APFM View Datasheet(PDF) - Fujitsu

Part Name

Description

Manufacturer

MB89P677APFM

8-bit Proprietary Microcontroller

Fujitsu 

MB89670/A Series

5. A/D Converter Electrical Characteristics

Parameter

Symbol

(AVCC = VCC = +3.5 V to +6.0 V, FC = 10 MHz, AVSS = VSS = 0.0 V, TA = –40°C to +85°C)

Value

Pin

Unit Remarks

Min.

Typ.

Max.

Resolution

—

—

10

bit

Linearity error

—

—

—

Differential linearity error

—

—

±2.0

LSB

—

±1.5

LSB

Total error

Zero transition voltage

Full-scale transition

voltage

VOT

VFST

AN0 to AN7

—

—

±3.0

AVSS – 1.5 LSB AVSS + 0.5 LSB AVSS + 2.5 LSB

LSB

AVCC =

mV AVR = VCC

AN0 to AN7 AVR – 3.5 LSB AVR – 1.5 LSB AVR + 0.5 LSB mV

Interchannel disparity

—

A/D mode conversion

—

—

time

—

—

4

LSB

—

13.2

µs

At 10-MHz

oscillation

Analog port input current IAIN

AN0 to AN7

—

—

10

µA

Analog input voltage

AN0 to AN7

0

—

Reference voltage

AVR

0

—

AVR

V

—

AVCC

V

Reference voltage

supply current

IR

AVR

—

200



µA AVR = 5.0 V

Precautions: • The smaller | AVR – AVSS |, the greater the error would become relatively.

• The output impedance of the external circuit for the analog input must satisfy the following conditions:

Output impedance of the external circuit < Approx. 10 kΩ

If the output impedance of the external circuit is too high, an analog voltage sampling time might be

insufficient (sampling time = 6 µs at 10 MHz oscillation).

An analog input equivalent circuit is shown below.

R ≤ 10 kΩ is

recommended.

AN

Sample hold circuit

C .=. 60 pF

R =.. 3 kΩ

Comparator

If R > 10 kΩ, it is recommended

to connect an external capacitor

of approx. 0.1 µF.

Analog channel selector

Close for approx. 15 instruction cycles

after activating A/D conversion.

Microcontroller’s internal circuit

Since the A/D converter contains sample hold circuit, the level of the analog input pin might not stabilize within the

sampling period after A/D activation, resulting in inaccurate A/D conversion values, if the input impedance to the

analog pin is too high. Be sure to maintain an appropriate input impedance to the analog pin.

It is recommended to keep the input impedance to the analog pin not exceed 10 kΩ. If it exceeds 10 kΩ, it is

recommended to connect a capacitor of approx. 0.1 µF for the analog input pin.

Except for the sampling period after A/D activation, the input leakage current of the analog input pin is less than 10 µA.

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