(PDF) TP5089N Datasheet - TP5089 DTMF (TOUCH-TONE) Generator

Número de pieza	TP5089N
Descripción	TP5089 DTMF (TOUCH-TONE) Generator
Fabricantes	National Semiconductor
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No Preview Available ! December 1991 TP5089 DTMF (TOUCH-TONE) Generator General Description The TP5089 is a low threshold voltage field-implanted met- al gate CMOS integrated circuit It interfaces directly to a standard telephone keypad and generates all dual tone mul- ti-frequency pairs required in tone-dialing systems The tone synthesizers are locked to an on-chip reference oscillator using an inexpensive 3 579545 MHz crystal for high tone accuracy The crystal and an output load resistor are the only external components required for tone generation A MUTE OUT logic signal which changes state when any key is depressed is also provided Features Y 3 5V – 10V operation when generating tones Y 2V operation of keyscan and MUTE logic Y Static sensing of key closures or logic inputs Y On-chip 3 579545 MHz crystal-controlled oscillator Y Output amplitudes proportional to supply voltage Y High group pre-emphasis Y Low harmonic distortion Y Open emitter-follower low-impedance output Y SINGLE TONE INHIBIT pin Block Diagram FIGURE 1 C1995 National Semiconductor Corporation TL H 5057 TL H 5057 – 1 RRD-B30M115 Printed in U S A 1 page 5 5 Page

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PDF TP5089N Data sheet ( Hoja de datos )