REJ03D0861-0300 Rev.3.00 Mar 25, 2008

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M62301SP/FP

10 to 12-bit 4-ch Integrating A/D Converter

REJ03D0861-0300

Rev.3.00

Mar 25, 2008

Description

M62301 semiconductor integrated circuit forms an integrating A/D converter, being connected to a microcomputer unit.

By using selection signals and counter clock signals from the unit, a 10 to 12-bit A/D converter can be created at a low

cost.

The integration time and resolution can be set at the users option by changing external parameters. In addition, the

built-in circuit offset, delay time and temperature fluctuation are adjustable, enabling a wide range of applications.

M62301 has a 3 input decoder circuit, high-precision reference voltage (1.22 V) generator, current supply and

comparator for integration, and voltage-monitoring reset circuit for a 5 V power supply. It is also equipped with

girdling to prevent current leak from integration capacitor.

Features

• Separate power supplies for analog section and digital section.

• Low power dissipation: 2 mA (Typ)

(1 mA for A/D conversion and the other 1 mA for reset)

• Linear error: ±0.02% (Typ)

• Conversion time: 526 µs/ch (Typ)

• Built-in system reset: 4.45 V (Typ)

Application

High-precision control systems such as temperature control and speed control

Block Diagram

+

−

+

−

+

−

19

18

17

16

15

5

1

6

13

12

11

10

20

14

7

8

9

2

3

4

A1

A2

A3

INT

RESET

RESET

A4

A1

A2

A3

A4

GND

1.22 V

Reference

input

Reference

voltage

Integrating

capacitor

Guard

ring 1

Guard

ring 2

C0 C1 C2

Constant

current control

Analog

Analog

GND

Digital

GND

Digital

0.49 V

Discharge

Decoder

0.36 V

Delay

circuit

150

µs