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LS342 Datasheet Preview

LS342 Datasheet

MULTIFREQUENCY TO TELEPHONE LINE INTERFACE CIRCUIT

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LINEAR INTEGRATED CIRCUIT
MULTIFREQUENCY TO TELEPHONE LINE INTERFACE CIRCUIT
The LS342 is a monolithic integrated circuit in dual in-line minidip plastic package. It interfaces the
multifrequency tone diallers M751 and M761/761A to the line in telephone sets, performing the follow·
ing functions:
Adjustment of the DC current/voltage characteristic and AC input line impedance by means of an
external resistor (Rd.
Sending to the line of the multifrequency signal.
Adjustment of the signal level by means of an external resistor (R T ).
Stabilized supply voltage to the tone dialler.
ABSOLUTE MAXIMUM RATINGS
VL
IL
IL
Ptot
Top
Tstg , Tj
Maximum line voltage (pulse duration';;; 10 ms)
Maximum forward current
Maximum reverse current
Total power dissipation at Tamb = 70°C
Operating temperature
Storage and junction temperature
ORDERING NUMBER: LS342D
MECHANICAL DATA
~~;.5 .
.... .
7
22
'155
-150
800
-40 to 70
-55 to 150
V
mA
mA
mW
°C
°C
Dimensions in mm
303 6/82




SGS

LS342 Datasheet Preview

LS342 Datasheet

MULTIFREQUENCY TO TELEPHONE LINE INTERFACE CIRCUIT

No Preview Available !

CONNECTION DIAGRAM
(top view)
MULTIFREQUENCY INPUT 1
REGULATOR AC BYPASS 2
3
4
BLOCK DIAGRAM
~ SIGNAL LEVEL
8 ADJUSTMENT
~7 BIAS
~6 + VLAND MF OUTPUT
5~ ACIDC CHARACT.ADJUSt
5- 40731 2
DESCRIPTION
The L5342 interface the M751 and M761/761A tone diallers with the telephone line. Power is only
applied to the system when the handset is lifted and a key pressed. At this time 51 is also switched (see
fig. 2) disconnecting the speech circuit from the line and connecting the dialling circuit.
In the dialling condition the L5342 performs 3 functions:
1) D.C. and A.C. line termination
2) Tone dialler power supply
3) Amplification and transmission of tone pairs.
In the initial stage of switch-on the supply voltage VDD is regulated at ~ 4 volt. This overdrives the
M751/761/761A internal oscillator causing a rapid start-up and therefore rapid generation of output
tones.
When the system reaches its normal operating point the supply voltage VDD is stabilized at 2.5V ± 4%.
THERMAL DATA
Rthi-amb Thermal resistance junction-ambient
max 100 °C/W
304


Part Number LS342
Description MULTIFREQUENCY TO TELEPHONE LINE INTERFACE CIRCUIT
Maker SGS
Total Page 4 Pages
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