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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.
LS342 Datasheet
