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L3924A Schematic ( PDF Datasheet ) - ST Microelectronics

Teilenummer L3924A
Beschreibung (L3914A - L3934A) SPEECH AND 14 MEMORY DIALER
Hersteller ST Microelectronics
Logo ST Microelectronics Logo 




Gesamt 15 Seiten
L3924A Datasheet, Funktion
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 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
DIP28
SO28
ORDERING NUMBERS:
L3914AN
L3914AD
L3924AN
L3924AD
L3934AN
L3934AD
PIN CONNECTION (Top view)
KEYPAD CONFIGURATION
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.
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.
January 1995
1/15
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.






L3924A Datasheet, Funktion
L3914A - L3924A - L3934A
Figure 1: Tone Mode Timing
Figure 2: Pulse Mode Timing
6/15

6 Page









L3924A pdf, datenblatt
L3914A - L3924A - L3934A
Figure 9:Typical Application Circuit.
10 R1
TIP
D14
TPA270
RING
1N4004 x 4
D1 D4
D2 D3
10M
R6
SW1A
150K
R2
HP5A94 Q1
100K
R3
10K
R5
3.3K
R4
HF393
Q3
10V
D15
4.7nF
C6
1.2K
R7
1N4140
22µF/16V
C23
220µF
16V
C1
0.47µF
25V
C10
5.6V
D10
PULSE
4.7K RMF GDTMF
4.7nF CMF
3.579MHz x1
OSC
CERAMIC RESONATOR
BUZZER
6
22
5
HOOK
SW2
10µF/50V
C3
100K R8
SW1B
MODE
/PT
HKS
GND
RXOUT
100K RGRX GRX
3.6K R9
IREF
7
8
9
10
11
13
100µF C5
1K
RAC
VCC
RGIN
14
12
100nF
C4
15
LED
D95TL175
VDD
23
4
3
2
1
28
27
26
25
24
C4
C3
C2
C1
R1
R2
R3
R4
R5
1 2 3 FLASH
4 5 6 PROG
7 8 9 P/LND
* 0 # HOLD
E1 E2 E3 MEM
MIC+
21
1.2K
R14
MIC-
20
GTX 56K
19
RGTX
REG
18
LN
17
4.7µF/25V
C7
1.2K
R15
ILINE 390R11
16
3.9K R12
130K R13
120
RS1
D12
LED
20470
R10 RS2
220nF
CS
12/15

12 Page





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