M62301SP datasheet(7/12 Pages) RENESAS

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M62301SP/FP

REJ03D0861-0300 Rev.3.00 Mar 25, 2008

Page 7 of 11

2. 4-channel 12-bit A/D converter system

Separate power supplies to analog section and digital section, analog input voltage range mode wider up to VDD,

external reference voltage for integration.

To microcomputer

5 V power supply

To microcomputer

5 V power supply

To microcomputer

control pin

To counter

RESET

Input analog

voltage

8 V

2.5 V

10 k

24 k

10 k

II = 50 µA

µA

CINT

680 pF

CREF

6800 pF

4700 pF

813

912

VDD

Note:

CREF: To stabilize reference voltage, be sure to connect capacitance of approximately 4700 pF.

CINT: We suggest that this capacitance be connected to prevent malfunction due to noise.

Use CI that leaks as slight current as possible. To prevent leak to the circuit board, we recommend

providing guard ring (7), (9).

Because separate power supplies are provided for the analog are digital sections, the M62301 has two supply

voltage VCC and VDD, enabling a wide analog input voltage range VIA. The upper limit of the range is required to be

no more than the difference between VCC – 2.5 V as well as VDD, therefore, the analog input voltage range in this

application is 0 V to 5 V.

When the counter clock frequency is 8 MHz, resolution is;

8 M

≈ 212

µA

(5 + 0.13)

6800 pF

An A/D converter system with resolution of approximately 12 bits can be formed.

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