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TP5089N bảng dữ liệu(PDF) 1 Page - National Semiconductor (TI) |
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TP5089N bảng dữ liệu(HTML) 1 Page - National Semiconductor (TI) |
1 / 6 page 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 |
Số phần tương tự - TP5089N |
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Mô tả tương tự - TP5089N |
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