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SGS Thomson

L3926A Datasheet Preview

L3926A Datasheet

(L39x6A) Speech and 14 Memory Dialer

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L3916A
L3926A - L3936A
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SPEECH AND 14 MEMORY DIALER WITH LED DRIVER
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
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:
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:
L3916AN
L3916AD
L3926AN
L3926AD
L3936AN
L3936AD
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.




SGS Thomson

L3926A Datasheet Preview

L3926A Datasheet

(L39x6A) Speech and 14 Memory Dialer

No Preview Available !

L3916A - L3926A - L3936A
BLOCK DIAGRAM
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DESCRIPTION (continued)
When mated with a tone ringer, a complete tele-
phone can be produced with just two ICs.
The DC line interface circuit develops its own line
voltage across the device and it is adjustable by
external resistor to suit different country’s specifi-
cation.
The speech network provides the two to four
wires interface, electronic switching between dial-
ing and speech and automatic gain control on
transmit and receive.
The dialing network buffers up to 32 digits into the
LND memory that can be later redialed with a sin-
gle key input. Additionally, another 13 memories
(including 3 emergency memories) of 18 digits
memory is available. Users can store all 13 sig-
nalling keys and access several unique functions
with single key entries. These functions include:
Pause/Last Number Dialed (LND), Softswitch,
Flash.
2/15
The FLASH key simulates a timed hook flash to
transfer calls or to activate other special features
provided by the PABX or central office.
The PAUSE key stores a timed pause in the num-
ber sequence. Redial is then delayed until an out-
side line can be accessed or some other activity
occurs before normal signaling resumes.
A LND key input automatically redials the last
number dialed.
FUNCTION PIN DESCRIPTION
C1, C2, C3, C4, R5, R4, R3, R2, R1
Keyboards inputs. Pins 1, 2, 3, 4, 24, 25, 26, 27,
28. The one chip phone interfaces with either the
standard 2-of-9 with negative common or the sin-
gle-contact (Form A) keyboard.


Part Number L3926A
Description (L39x6A) Speech and 14 Memory Dialer
Maker SGS Thomson
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