ICL7135CPI datasheet(4/15 Pages) INTERSIL

Part #	ICL7135CPI

Description	41/2 Digit, BCD Output, A/D Converter

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Manufacturer	INTERSIL [Intersil Corporation]

Direct Link	http://www.intersil.com/cda/home

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4 / 15 page

4

FN3093.4

FIGURE 1. ICL7135 TEST CIRCUIT

FIGURE 2. ICL7135 DIGITAL LOGIC INPUT

FIGURE 3. ANALOG SECTION OF ICL7135

28

27

26

25

23

22

21

20

19

18

17

16

15

1

2

3

4

5

6

7

8

9

10

11

12

13

14

24

SET VREF = 1.000V

VREF IN

SIGNAL

-5V

+5V

100k

Ω

27

Ω

100k

Ω

100K

ANALOG

GND

INPUT

1

μF

0.47

μF

1

μF

0.1

μF

100k

Ω

ICL7135

0V

CLOCK

IN

120kHz

UNDERRANGE

OVERRANGE

STROBE

RUN/HOLD

DIGITAL GND

POLARITY

CLOCK IN

BUSY

LSD DI

D2

D3

D4

MSB B8

B4

V-

REF

ANALOG GND

INT OUT

A-Z IN

BUF OUT

REF CAP 1

REF CAP 2

IN LO-

IN HI+

V+

MSD D5

LSB B1

B2

V+

PAD

DIG GND

CREF+

REF HI

IN HI

INT

A/Z

ANALOG

AZ

IN LO

ZI

CREF BUFFER

COMMON

INPUT

COMPARATOR

CAZ

CINT

RINT

INTEGRATOR

INPUT

V +

V -

POLARITY

ZERO-

LOW

HIGH

CROSSING

DETECTOR

F/F

DE(+)

DE(-)

DE(+)

AZ

AUTO

ZERO

INT

1

2

3

4

5

611

10

9

87

-

+

-

+

CREF

A/Z, DE(

±), ZI

INT

ICL7135

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