1

®

November 2000

ICL7109

12-Bit, Microprocessor-

Compatible A/D Converter

Features

• 12-Bit Binary (Plus Polarity and Over-Range) Dual

Slope Integrating Analog-to-Digital Converter

• Byte-Organized, TTL Compatible Three-State Outputs

and UART Handshake Mode for Simple Parallel or

Serial Interfacing to Microprocessor Systems

• RUN/HOLD Input and STATUS Output Can Be Used to

Monitor and Control Conversion Timing

• True Differential Input and Differential Reference

• Low Noise (Typ) . . . . . . . . . . . . . . . . . . . . . . . . 15

• Input Current (Typ) . . . . . . . . . . . . . . . . . . . . . . . . . .1pA

• Operates At Up to 30 Conversions/s

• On-Chip Oscillator Operates with Inexpensive 3.58MHz

TV Crystal Giving 7.5 Conversions/s for 60Hz Rejec-

tion. May Also Be Used with An RC Network Oscillator

for Other Clock Frequencies

Description

The ICL7109 is a high performance, CMOS, low power

integrating A/D converter designed to easily interface with

microprocessors.

The output data (12 bits, polarity and over-range) may be

directly accessed under control of two byte enable inputs and a

chip select input for a single parallel bus interface. A UART

handshake mode is provided to allow the ICL7109 to work with

industry-standard UARTs in providing serial data transmission.

The RUN/HOLD input and STATUS output allow monitoring

and control of conversion timing.

The ICL7109 provides the user with the high accuracy, low

noise, low drift versatility and economy of the dual-slope

integrating A/D converter. Features like true differential input

and reference, drift of less than 1

current of 10pA, and typical power consumption of 20mW

make the ICL7109 an attractive per-channel alternative to

analog multiplexing for many data acquisition applications.

Pinout

ICL7109

(CERDIP, PDIP, SBDIP)

TOP VIEW

Part Number Information

PART NUMBER

TEMP.

PACKAGE

PKG.

NO.

ICL7109MDL

-55 to 125

40 Ld SBDIP

D40.6

ICL7109IDL

-25 to 85

40 Ld SBDIP

D40.6

ICL7109IJL

-25 to 85

40 Ld CERDIP

F40.6

ICL7109CPL

0 to 70

40 Ld PDIP

E40.6

ICL7109MDL/883B

-55 to 125

40 Ld SBDIP

D40.6

ICL7109IPL

-25 to 85

40 Ld PDIP

E40.6

13

1

2

3

4

5

6

7

8

9

10

11

12

14

15

16

17

18

19

20

GND

STATUS

POL

OR

B12

B11

B10

B9

B8

B7

B6

B5

B4

B3

B2

B1

TEST

LBEN

HBEN

CE/LOAD

28

40

39

38

37

36

35

34

33

32

31

30

29

27

26

25

24

23

22

21

V+

REF IN -

REF CAP-

REF CAP+

REF IN+

IN HI

IN LO

COMMON

INT

AZ

BUF

REF OUT

V-

SEND

RUN/HOLD

BUF OSC OUT

OSC SEL

OSC OUT

OSC IN

MODE

File Number

3092.2

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143

Copyright © Intersil Americas Inc. 2002. All Rights Reserved

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