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TECHNICAL DATA

MULTISTANDARD

CMOS IC

OF SINGLE CHIP PHONE WITH

DOUBLE SOFT LIMITATION

Description

IL2533N, IL2533D is CMOS IC, supporting all functions, necessary for design of electronic

telephone with high characteristics. Standard application circuit is shown at figure 2.

Device includes LD/MF constant automatic dialer, melodies generation, ring frequency

identification and high quality circuit for line/speech.

RAM at chip, intended for redialing of 31-digit number and memory elements, containing upto 21

symbols/data. Floating marker method enables to use LNR function under control of different

袪袗袙嘯

systems. Device contains volume control of hearing aid. Volume is controlled by VOL button

(5.4dB) or "鈥?+" button (plus 8.1/minus 5.4dB in 5 levels).

Main features

鈹€

Line/speech circuit. LD/MF constant automatic dialer

and tone ring at one 28-pin CMOS chip.

鈹€

Operational range 13 to 100 m袗 (decreasing upto 5 m袗

causes productivity deterioration).

鈹€

Soft limitation for elimination of drastic distortion.

鈹€

Controlling of received signal volume.

鈹€

Automatic line loss compensation.

鈹€

Low noise level (max 鈥?72 dBmp).

鈹€

Actual or complex impedance.

鈹€

Switching LD/MF dialing.

鈹€

Tone damper during programming.

鈹€

Redial of the last 31 digit number.

鈹€

Reference storage.

鈹€

Redial of busy line or previous connection.

鈹€

Pause button for applying to pause or waiting function.

鈹€

3 pulse flashes: buttons, 鈥淩1鈥濃€?00 ms, 鈥淩2鈥?鈥?280 ms

and 鈥淩3鈥?鈥?375/600 ms.

鈹€

Active RC-filter on chip.

鈹€

Circuit of ring frequency determination.

鈹€

Three-tone melody generator

L

S

MFL

RO

VDD

AGND

ST

B

CI

L

O

LCC

HS/DP

OS

C

MODE

C4

C3

01

02

03

04

05

06

07

08

09

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

RI

L

I

VSS

CS

M2

M1

L

ED

FCI

R1

R2

R3

R4

C1

C2

package pin out

PACKAGE

IL2533D assembly to 28-pin SO-package

MS-013AE.

IL2533N assembly to 28-pin DIP-package

MS-011AB.

1

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