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MT8870DE
ISO2 MT8870D/MT8870D-1 -CMOS Integrated DTMF Receiver Data Sheet Features October 2006 • 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 Ordering Information MT8870DE MT8870DS MT8870DN MT8870DSR MT8870DNR MT8870DN1 MT8870DE1 MT8870DS1 MT8870DNR1 MT8870DSR1 MT8870DE1-1 MT8870DS1-1 MT8870DSR1-1 Applications 18 Pin PDIP 18 Pin SOIC 20 Pin SSOP 18 Pin SOIC 20 Pin SSOP 20 Pin SSOP* 18 Pin PDIP* 18 Pin SOIC* 20 Pin SSOP* 18 Pin SOIC* 18 Pin PDIP* 18 Pin SOIC* 18 Pin SOIC* *Pb Free Matte Tin Tubes Tubes Tubes Tape & Tape & Tubes Tubes Tubes Tape & Tape & Tubes Tubes Tape & Reel Reel Reel Reel Reel -40°C to +85°C • 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 VDD PWDN 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 tone-pairs into a 4-bit code. VSS VRef Bias Circuit Q1 High Group Filter Dial Tone Filter IN - INH VRef Buffer Chip Chip Power Bias IN + Description Digital Detection Algorithm Code Converter and Latch Q2 Zero Crossing Detectors Q3 Low Group Filter GS Q4 to all Chip Clocks OSC1 St GT OSC2 St/GT Steering Logic ESt STD Figure 1 - Functional Block Diagram 1 Zarlink Semiconductor Inc. Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc. Copyright 1997-2006, Zarlink Semiconductor Inc. All Rights Reserved. TOE
MICRON
Micron Technology
U.S.A
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