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MT8880 Datasheet(PDF) 1 Page - Mitel Networks Corporation |
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MT8880 Datasheet(HTML) 1 Page - Mitel Networks Corporation |
1 / 18 page 4-33 ® MT8880C/MT8880C-1 Integrated DTMF Transceiver Features • Complete DTMF transmitter/receiver • Central office quality • Low power consumption • Microprocessor port • Adjustable guard time • Automatic tone burst mode • Call progress mode Applications • Credit card systems • Paging systems • Repeater systems/mobile radio • Interconnect dialers • Personal computers Description The MT8880C/C-1 is a monolithic DTMF transceiver with call progress filter. It is fabricated in Mitel’s ISO2-CMOS technology, which provides low power dissipation and high reliability. The DTMF receiver is based upon the industry standard MT8870 monolithic DTMF receiver; the transmitter utilizes a switched capacitor D/A converter for low distortion, high accuracy DTMF signalling. Internal counters provide a burst mode such that tone bursts can be transmitted with precise timing. A call progress filter can be selected allowing a microprocessor to analyze call progress tones. A standard microprocessor bus is provided and is directly compatible with 6800 series microprocessors. The MT8880C-1 is functionally identical to the MT8880C except for the performance of the receiver section, which is enhanced to accept and reject lower signal levels. Ordering Information MT8880CE/CE-1 20 Pin Plastic DIP MT8880CC/CC-1 20 Pin Ceramic DIP MT8880CS/CS-1 20 Pin SOIC MT8880CN/CN-1 24 Pin SSOP MT8880CP/CP-1 28 Pin Plastic LCC -40°C to +85°C Figure 1 - Functional Block Diagram TONE IN+ IN- GS OSC1 OSC2 VDD VRef VSS ESt St/GT D0 D1 D2 D3 IRQ/CP Φ2 CS R/W RS0 ∑ D/A Converters Row and Column Counters Transmit Data Register Data Bus Buffer Tone Burst Gating Cct. + - Oscillator Circuit Bias Circuit Control Logic Digital Algorithm and Code Converter Control Logic Steering Logic Status Register Control Register A Control Register B Receive Data Register Interrupt Logic I/O Control Low Group Filter High Group Filter Dial Tone Filter ISSUE 2 May 1995 ISO2-CMOS |
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