TP5089中文资料DTMF (TOUCH-TONE) Generator数据手册TI规格书

描述 Description

General Description
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 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.

特性 Features

■ 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 distortion
■ Open emitter-follower low-impedance output
■ SINGLE TONE INHIBIT pin