L3914A

L3924A - L3934A

SPEECH AND 14 MEMORY DIALER WITH HOLD FUNCTION

ADVANCE DATA

SPEECH CIRCUIT

2 TO 4 WIRES CONVERSION

PRESENT THE PROPER DC PATH FOR THE

LINE CURRENT AND THE FLEXIBILITY TO

ADJUST IT AND ALLOW PARALLEL PHONE

OPERATION

PROVIDES SUPPLY WITH LIMITED CUR-

RENT FOR EXTERNAL CIRCUITRY

SYMMETRICAL HIGH IMPEDANCE MICRO-

PHONE INPUTS SUITABLE FOR DYNAMIC

ELECTRET

OR

PIEZOELECTRIC

TRANSDUCER

ASYMMETRICAL

EARPHONE

OUTPUT

SUITABLE FOR DYNAMIC TRANSDUCER

LINE LOSS COMPENSATION

INTERNAL MUTING TO DISABLE SPEECH

DURING DIALING

HOLD FUNCTION FOR PARALLEL PHONE

WITH 400ms DELAY TO PREVENT FALSE

RELEASE

DIALER CIRCUIT

32 DIGITS FOR LAST NUMBER REDIAL

BUFFER

18 DIGITS FOR 13 MEMORY REDIAL

ALLOW MIXED MODE DIALING IN EITHER

TONE OR PULSE MODE

PACIFIER TONE PROVIDES AUDIBLE INDI-

CATION OF VALID KEY PRESSED IN A

BUZZER OR/AND IN THE EARPHONE

TIMED PABX PAUSE

FLASH INITIATES TIMED BREAK:

MASK OPTIONS WITH 585ms,300ms,100ms

CONTINUOUS TONE FOR EACH DIGIT UN-

TIL KEY RELEASE

USES

INEXPENSIVE

3.579545MHz

CE-

RAMIC RESONATOR

POWERED FROM TELEPHONE LINE, LOW

OPERATING VOLTAGE FOR LONG LOOP

APPLICATION

DESCRIPTION

The device consists of the speech and the dialer.

It provides the DC line interface circuit that termi-

nates the telephone line, analog amplifier for

speech transmission and necessary signals for

either DTMF or loop disconnect (pulse) dialing.

This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

January 1995

PIN CONNECTION (Top view)

KEYPAD CONFIGURATION

DIP28

SO28

ORDERING NUMBERS:

L3914AN

L3914AD

L3924AN

L3924AD

L3934AN

L3934AD

Note: PAUSE/LND:

PAUSE and LND functions are sharing the same key with different

sequence. Hereafter, PAUSE and LND keys arereferring to the same

key.

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