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MT8870

Part Number	MT8870
Manufacturer	Mitel Networks Corporation
Description	ISO2-CMOS Integrated DTMF Receiver
Published	Apr 8, 2005
Detailed Description	® ISO2-CMOS MT8870D/MT8870D-1 Integrated DTMF Receiver Features • • • • • • • • Complete DTMF Receiver Low power cons...
Datasheet	MT8870 PDF File

Overview

® ISO2-CMOS MT8870D/MT8870D-1 Integrated DTMF Receiver Features • • • • • • • • 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 ISSUE 3 May1995 Ordering Information MT8870DE/DE-1 18 Pin Plastic DIP MT8870DC/DC-1 18 Pin Ceramic DIP MT8870DS/DS-1 18 Pin SOIC MT8870DN/DN-1 20 Pin SSOP MT8870DT/DT-1 20 Pin TSSOP -40 °C to +85 °C Description 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.
Applications • • • • • • • 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 VSS VRef INH PWDN Bias Circuit VRef Buffer Q1 Chip Chip Power Bias IN + IN GS Dial Tone Filter High Group Filter Zero Crossing Detectors Low Group Filter Digital Detection Algorithm Code Converter and Latch Q2 Q3 Q4 to all Chip Clocks St GT Steering Logic OSC1 OSC2 St/GT ESt STD TOE Figure 1 - Functional Block Diagram 4-11 MT8870D/MT8870D-1 IN+ INGS VRef INH PWDN OSC1 OSC2 VSS 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 ISO2-CMOS VDD St/GT ESt StD Q4 Q3 Q2 Q1 TOE IN+ INGS VRef INH PWDN NC OSC1 OSC2 VSS 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VDD St/GT ESt StD NC Q4 Q3 Q2 Q1 TOE 18 PIN CERDIP/PLASTIC DIP/SOIC 20 PIN SSOP/TSSOP Figure 2 - Pin Connections Pin Description Pin # 18 1 2 3 4 5 6 7 8 9 10 20 1 2 3 4 5 6 8 9 10 11 Name IN+ INGS VRef INH PWDN OSC1 OSC2 VSS TOE ...

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