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PDF TP5089 Data sheet ( Hoja de datos )
| Número de pieza | TP5089 | |
| Descripción | TP5089 DTMF (TOUCH-TONE) Generator | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TP5089 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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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  
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5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet TP5089.PDF ] | |
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