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LS256D Datasheet(PDF) 1 Page - STMicroelectronics |
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LS256D Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 8 page LS256 November 1996 TONE GENERATOR INTERFACE TELEPHONE SPEECH CIRCUIT WITH MULTIFREQUENCY . PRESENTS THE PROPER DC PATH FOR THE LINE CURRENT . HANDLES THE VOICE SIGNAL, PERFORM- ING THE 2/4 WIRES INTERFACE AND CHANGING THE GAIN ON BOTH SENDING AND RECEIVING AMPLIFIERS TO COMPEN- SATE FOR LINE ATTENUATION BY SENSING THELINE LENGTH THROUGH THE LINE CUR- RENT . ACTS AS LINEAR INTERFACE FOR MF, SUP- PLYING A STABILIZEDTO THE DIGITAL CHIP AND DELIVERING TO THE LINE THE MF TONE GENERATED BY THE DIALER DESCRIPTION The LS256 is a monolithic integrated circuit in 16- lead dual in-line and SO20 plastic packages to re- placethe hybridcircuit in telephoneset. It workswith the same type of transdurcers for both transmitter and receiver (typically piezoceramic capsules, but DIP16 ORDERING NUMBERS : LS256B LS256D the device can work also with dynamic ones). Many of its electrical characteristics can be controlled by means of external components to meet different specifications. In addition to the speech operation, the LS256 acts as an interface for the MF tone signal. PIN CONNECTIONS (to p view) DIP16 SO20 N.C. MIC. INPUT +LINE MUTING BIAS ADJ. DC. REGULATOR SHUNT REG. BYPASS LINE CURRENT SENSING GAIN CONTROL -LINE INPUT-(REC.AMP.) INPUT+(REC.AMP.) RECEIVER OUTPUT RECEIVER OUTPUT MF INPUT V DD MIC. INPUT N.C. 1 3 2 4 5 6 7 8 9 18 17 16 15 14 12 13 11 19 10 20 N.C. N.C. D96TL274 SO20 1/8 |
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