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L3924A

ST Microelectronics
Part Number L3924A
Manufacturer ST Microelectronics
Description (L3914A - L3934A) SPEECH AND 14 MEMORY DIALER
Published Feb 15, 2007
Detailed Description www.DataSheet4U.com L3914A L3924A - L3934A SPEECH AND 14 MEMORY DIALER WITH HOLD FUNCTION ADVANCE DATA SPEECH CIRCUIT ...
Datasheet PDF File L3924A PDF File

L3924A
L3924A

Overview
www.
DataSheet4U.
com 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 CURRENT FOR EXTERNAL CIRCUITRY SYMMETRICAL HIGH IMPEDANCE MICROPHONE 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 INDICATION 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 UNTIL KEY RELEASE USES INEXPENSIVE 3.
579545MHz CERAMIC 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 terminates the telephone line, analog amplifier for speech transmission and necessary signals for either DTMF or loop disconnect (pulse) dialing.
January 1995 DIP28 SO28 ORDERING NUMBERS: L3914AN L3914AD L3924AN L3924AD L3934AN L3934AD PIN CONNECTION (Top view) KEYPAD CONFIGURATION 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.
1/15 This is advanced information on a new product now in development or undergoing evaluation.
Details are subject to change without notice.
L3914A - L3924A - L3934A BLOCK DIAGRAM When mated with a tone ringer, a complete telephone can be produced with just two ICs.
The DC line interface circuit develops its own line volta...


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