TP5089 Datasheet (National Semiconductor) - TP5089 DTMF (TOUCH-TONE) Generator

TP5089, TP5089 DTMF (TOUCH-TONE) Generator

The TP5089 is a low threshold voltage field-implanted metal gate CMOS integrated circuit It interfaces directly to a standard telephone keypad and generates all dual tone multi-frequency pairs required in tone-dialing systems The tone synthesizers are locked to an on-chip reference oscillator using

TP5089 Features

* Y Y Y Y Y Y Y Y Y 3 5V

* 10V operation when generating tones 2V operation of keyscan and MUTE logic Static sensing of key closures or logic inputs On-chip 3 579545 MHz crystal-controlled oscillator Output amplitudes proportional to supply voltage High group pre-emphasis Low harmonic distort