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TP5089 Datasheet

  • TP5089

  • TP5089 DTMF (TOUCH-TONE) Generator

  • 122.76KB

  • 6頁

  • NSC

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TP5089 DTMF(TOUCH-TONE) Generator
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
Y
Y
Y
Y
Y
Y
Y
Y
3 5V鈥?0V 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
Block Diagram
TL H 5057 鈥?1
FIGURE 1
C
1995 National Semiconductor Corporation
TL H 5057
RRD-B30M115 Printed in U S A

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