LS342 Description
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.