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
Constant
current control
12
Analog Analog Digital Digital
V
CC
GND GND V
DD
11
10
20
14
A1
19
A2
18
A3
17
A4
16
Reference
15
input
A1
A2
A3
A4
V
REF
GND
Discharge
Decoder
+
−
Logic control
0.49 V
+
−
+
−
0.36 V
5
INT
1
150
µs
+
−
Delay
circuit
6
V
CC
for
RESET
RESET
Reference
13
voltage
V
REF
1.22 V
7
8
9
2
3
4
Guard Integrating Guard C0 C1 C2
ring 1 capacitor ring 2
REJ03D0861-0300 Rev.3.00 Mar 25, 2008
Page 1 of 11
RENESAS [ RENESAS TECHNOLOGY CORP ]
