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MT8889C Datasheet(PDF) 1 Page - Mitel Networks Corporation |
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MT8889C Datasheet(HTML) 1 Page - Mitel Networks Corporation |
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1 / 18 page  4-107 ® Features • Central office quality DTMF transmitter/ receiver • Low power consumption • High speed adaptive micro interface • Adjustable guard time • Automatic tone burst mode • Call progress tone detection to -30dBm Applications • Credit card systems • Paging systems • Repeater systems/mobile radio • Interconnect dialers • Personal computers Description The MT8889C is a monolithic DTMF transceiver with call progress filter. It is fabricated in CMOS technology offering low power consumption and high reliability. The receiver section is based upon the industry standard MT8870 DTMF receiver while 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. The MT8889C utilizes an adaptive micro interface, which allows the device to be connected to a number of popular microcontrollers with minimal external logic. The MT8889C-1 is functionally identical to the MT8889C except the receiver is enhanced to accept lower level signals, and also has a specified low signal rejection level. Ordering Information MT8889CE/CE-1 20 Pin Plastic DIP MT8889CC/CC-1 20 Pin Ceramic DIP MT8889CS/CS-1 20 Pin SOIC MT8889CN/CN-1 24 Pin SSOP -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 DS/RD CS R/W/WR 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 MT8889C/MT8889C-1 Integrated DTMF Transceiver with Adaptive Micro Interface |
Número de pieza similar - MT8889C |
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Descripción similar - MT8889C |
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