L3916A

SPEECH AND 14 MEMORY DIALER WITH LED DRIVER

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

LIGHTED DIAL LED CONSUMING 25% OF

LINE CURRENT

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: 585ms.

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.

March 2000

®

PIN CONNECTION (Top view)

KEYPAD CONFIGURATION

SO28

ORDERING NUMBER: L3916AD

Note: PAUSE/LND:

PAUSE and LND functions are sharing the same key with different

sequence. Hereafter, PAUSE and LND keys are referring to the same

key.

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