one chip telephone circuit.
D Adjustable dc slope characteristic D Adjustable automatic line length receiving and sending gain control (not used in DTMF) with the possibility of fixed gain (PABX) D .
Test pin Ground Not connected Line length AGC adjustment Bias adjustment Electronic self input DC characteristic slope .
TELEFUNKEN microelectronic’s one chip telephone circuit, U 3750 BM, is BICMOS integrated circuit that performs all the speech and line interface functions required in an electronic telephone set, the tone ringer, the pulse and DTMF dialling with redi.
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