HI7131CM44 查看數據表（PDF） - Intersil

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HI7131CM44

3 1/2 Digit, Low Power, High CMRR, LCD/LED Display-Type A/D Converters

Intersil 

HI7131, HI7133

LCD/LED

DISPLAY

A-Z

BUFF

V+

OSC1

OSC2

INT

OSC3

9V

IN HI

ANALOG

INPUT

CREF+

IN LO

CREF -

REF HI

COMMON

REF LO

V-

FIGURE 89. TYPICAL APPLICATION CIRCUIT

EXTERNAL

40

CLOCK

39

38

37

EXTERNAL

REFERENCE

CVREF

36

1µF

35

CREF 34

0.1µF 33

EXTERNAL

INPUT

RIN 1M

CIN

32

31

0.01µF 30

CAZ

RINT

CINT

Critical Components General Specifications:

1. CINT: Low dielectric absorption capacitor,

polypropylene or similar

2. CAZ, CREF, CIN: Low leakage capacitors

29

0.47µF28

180K

27

0.047µF

HI7131, HI7133

DUT

OSC 1

OSC 2

OSC 3

TEST

REF HI

REF LO

CREF+

CREF -

COMMON

IN HI

IN LO

A-Z

BUFF

INT

V+

D1

C1

B1

A1

F1

G1

E1

D2

C2

B2

A2

F2

E2

D3

B3

F3

E3

AB4

POL

BP/GND

G3

A3

C3

G2

V-

+5V

0.47µF

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

0.47µF

-5V

FIGURE 90. TEST CIRCUIT

LCD/LED

DISPLAY

AND

TEST

LOGIC

CIN = 0.01µF CAZ = 0.47µF

CREF = 0.1µF CVRH =1µF

CINT = 0.047µF RIN = 1MΩ

RINT = 180kΩ

3-1828

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