'DTMF' related articles 2

  1. 2008/05/15 M-8870 - DTMF Receiver
  2. 2007/01/09 MT8870D - Integrated DTMF Receiver

M-8870 - DTMF Receiver

ETC 2008/05/15 09:19

 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.
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.

* 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


TAG DTMF, Receiver

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• Complete DTMF Receiver
• Low power consumption
• Internal gain setting amplifier
• Adjustable guard time
• Central office quality
• Power-down mode
• Inhibit mode
• Backward compatible with MT8870C/MT8870C-1

• Receiver system for British Telecom (BT) or CEPT Spec (MT8870D-1)
• Paging systems
• Repeater systems/mobile radio
• Credit card systems
• Remote control
• Personal computers
• Telephone answering machine

The MT8870D/MT8870D-1 is a complete DTMF receiver integrating both the bandsplit filter and digital decoder functions. The filter section uses switched capacitor techniques for high and low group filters; the decoder uses digital counting techniques to detect and decode all 16 DTMF tonepairs into a 4-bit code. External component count is minimized by on chip provision of a differential input amplifier, clock oscillator and latched three-state bus interface.

MT8870DE MT8870DC MT8870DS MT8870DN MT8870DT MT8870DN-1 MT8870DT-1
TAG DTMF, Receiver

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