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MT88L89AS Datasheet(PDF) 1 Page - Mitel Networks Corporation |
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MT88L89AS Datasheet(HTML) 1 Page - Mitel Networks Corporation |
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1 / 20 page  4-125 ® Features • Central office quality DTMF transmitter/ receiver • Low voltage operation (2.7-3.6V) • Adjustable guard time • Automatic tone burst mode • Call progress tone detection to -30dBm • Adaptive micro interface enables compatibility with existing MT8880/MT8888 designs • DTMF transmitter/receiver power down via register control Applications • Credit card systems • Paging systems • Repeater systems/mobile radio • Interconnect dialers • Personal computers Description The MT88L89 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 MT88L89 utilizes an adaptive micro interface, which allows the device to be connected to a number of popular microcontrollers with minimal external logic. The MT88L89 provides enhanced power down features. The transmitter and receiver may independently be powered down via register control. Ordering Information MT88L89AE 20 Pin Plastic DIP MT88L89AC 20 Pin Ceramic DIP MT88L89AS 20 Pin SOIC MT88L89AN 24 Pin SSOP MT88L89AP 28 Pin PLCC -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 1 May 1995 MT88L89 3V Integrated DTMF Transceiver with Adaptive Micro Interface Advance Information |
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Similar Description - MT88L89AS |
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