M62301FP データシートの表示（PDF） - Renesas Electronics

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M62301FP

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

Renesas Electronics 

M62301SP/FP

Application Suggestion

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

To microcomputer

5 V power supply

10 k 10 k

1

2

To microcomputer

3

control pin

4

To counter

To RESET

5

6

CINT

680 pF

7

8

CI

4700 pF

9

50 µA

10

5V

20

19

18

Input analog

17

voltage

16

15

14

CREF 4700 pF

13

12

11

II = 50 µA

RI 24 k

Charge current II =

1.22 V

24 kΩ

≈ 50 µA

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;

4700

pF ×

(2.5 + 0.13)

50 µA

1

8M

≈ 211

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

REJ03D0861-0300 Rev.3.00 Mar 25, 2008

Page 6 of 11

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