M62301SP datasheet(6/12 Pages) RENESAS

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M62301SP/FP

REJ03D0861-0300 Rev.3.00 Mar 25, 2008

Page 6 of 11

Application Suggestion

1. 4-channel 11-bit A/D converter system

To microcomputer

5 V power supply

To microcomputer

control pin

To counter

RESET

Input analog

voltage

5 V

10 k

24 k

10 k

II = 50 µA

µA

CINT

680 pF

CREF

4700 pF

Charge current II =

≈ 50 µA

1.22 V

24 k

Ω

813

912

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).

Resolution depends on the number of microcomputer counter clock pulses that are generated while the INT output

status is "high" at the maximum input voltage 2.5 V (VCC – 2.5 V).

When the microcomputer counter clock frequency is 8 MHz, the resolution can be calculated by using the constant

calculated above, as follows;

8 M

≈ 211

µA

(2.5 + 0.13)

4700 pF

Therefore, the resolution of this system is approximately 11 bits.

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