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M-8870

器件名称: M-8870
功能描述: DTMF Receiver
文件大小: 255.2KB    共8页
生产厂商: ETC
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简  介:M-8870 DTMF Receiver Low power consumption Adjustable acquisition and release times Central office quality and performance Power-down and inhibit modes (-02 only) Inexpensive 3.58 MHz time base Single 5 volt power supply Dial tone suppression Applications include: telephone switch equipment, remote data entry, paging systems, personal computers, credit card systems The M-8870 is a full DTMF Receiver that integrates both bandsplit filter and decoder functions into a single 18-pin DIP or SOIC package. Manufactured using CMOS process technology, the M-8870 offers low power consumption (35 mW max) and precise data handling. Its filter section uses switched capacitor technology for both the high and low group filters and for dial tone rejection. Its decoder uses digital counting techniques to detect and decode all 16 DTMF tone pairs into a 4-bit code. External component count is minimized by provision of an on-chip differential input amplifier, clock generator, and latched tri-state interface bus. Minimal external components required include a low-cost 3.579545 MHz color burst crystal, a timing resistor, and a timing capacitor. Figure 1 Pin Connections The M-8870-02 provides a “power-down” option which, when enabled, drops consumption to less than 0.5 mW. The M-8870-02 can also inhibit the decoding of fourth column digits (see Table 5). Figure 2 Block Diagram Teltone Corporation, 22121-20th Avenue SE, Bothell, WA 98021-4408 U.S.A 40-406-00011, Rev. E Phone: 800-426-39……
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