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M-8870-01SM Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers

Part No. M-8870-01SM
Description  DTMF Receiver
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Maker  ETC2 [List of Unclassifed Manufacturers]
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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, re-
mote 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 technol-
ogy, the M-8870 offers low power consumption (35 mW max)
and precise data handling. Its filter section uses switched ca-
pacitor 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 in-
clude a low-cost 3.579545 MHz color burst crystal, a timing re-
sistor, and a timing capacitor.
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).
Page 1
Teltone Corporation, 22121-20th Avenue SE, Bothell, WA 98021-4408 U.S.A
Phone: 800-426-3926 or 425-487-1515 Fax: 425-487-2288
40-406-00011, Rev. E
E-mail: info@teltone.com Internet: www.teltone.com
Figure 2 Block Diagram
Figure 1 Pin Connections




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