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TP5089N bảng dữ liệu(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện TP5089N
Giải thích chi tiết về linh kiện  TP5089 DTMF (TOUCH-TONE) Generator
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TLH5057
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 3579545 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
35V – 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 3579545 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
TLH5057 – 1
FIGURE 1
C1995 National Semiconductor Corporation
RRD-B30M115Printed in U S A


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