TC7135(2002) 查看數據表（PDF） - Microchip Technology

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TC7135
(Rev.:2002)

4-1/2 Digit A/D Converter

Microchip Technology 

TC7135

FIGURE 6-2:

4-1/2 DIGIT ADC WITH MULTIPLEXED COMMON ANODE LED DISPLAY

+5V

20 19 18 17 12

D1 D2 D3 D4 D5

4

INT OUT

0.33µF

1µF

5 AZ IN

6 BUFF

POL 23

+

100kΩ

200kHz

22

100kΩ

10

OUT

FIN TC7135

CREF-

CREF+

7

8

+INPUT

Analog

Input

–

1µF 9

–INPUT

3 ANALOG

COMMON

B8 16

B4

B2

15

14

B1 13

REF

V – IN

V+

12

11

4.7kΩ

1µF

V+

–5V

MCP1525

100kΩ

1µF

bc

Blank MSD On Zero

6

2

1

D

C

B

7A

7

7

7

7

X7

5 9–15

RBI

DM7447A

16 +5V

FIGURE 6-3:

R2

RC OSCILLATOR CIRCUIT

R1

C

FO

Gates are 74C04

1

1. FO = 2C(0.41 RP + 0.7 R1) , RP =

R1 R2

R1 + R2

a. If R1 = R2 = R1, F≅ 0.55/RC

b. If R2 >> R1, F ≅ 0.45/R1C

c. If R2 << R1, F ≅ 0.72/R1C

2. Examples:

a. F = 120kHz, C = 420pF

R1 = R2 ≈ 10.9 kΩ

b. F = 120kHz, C = 420pF, R2 = 50kΩ

R1 = 8.93kΩ

c. F = 120 kHz, C = 220 pF, R2 = 5kΩ

R1 = 27.3kΩ

FIGURE 6-4:

COMPARATOR CLOCK

CIRCUITS

+5V

0.22µF

16kΩ

16kΩ

56kΩ

2+ 8

LM311 7

3-

1

4

1kΩ

VOUT

30kΩ

390pF

R2

100kΩ

+5V R4

2kΩ

R2

100kΩ

C1

0.1µF

2+ 6

LM311

3-

4

1

C2

10pF

7

VOUT

R3

50kΩ

DS21460B-page 14

© 2002 Microchip Technology Inc.

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