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MT8840AS Datasheet(PDF) 1 Page - Mitel Networks Corporation |
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MT8840AS Datasheet(HTML) 1 Page - Mitel Networks Corporation |
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1 / 8 page  5-3 ® MT8840 Data Over Voice Modem Features • Performs ASK (amplitude shift keyed) modulation and demodulation • 32 kHz carrier frequency • Up to 2 kbit/s full duplex data transfer rate • On-chip oscillator • On-chip tone caller for alerting functions • Adjustable tone caller frequencies • Selectable self-loop test mode • 5V/2.5mA power supply •ISO2-CMOS and switched capacitor technologies •18 Pin DIP Applications • Simultaneous data and voice communication in PABXs • 2 kbit/s data modem • "Smart" telephone sets Description The MT8840 is a carrier over voice modem which allows simultaneous transfer of voice and data over a single pair of wires. Data is transferred on an amplitude shift keyed (ASK) 32 kHz carrier. On-chip filters remove voice frequency signals from the received composite voice and data signal prior to demodulation. The modulating signal is a bit stream with a typical data rate of 2 kbit/s. In addition, the device contains a two tone warbler which functions as a telephone ringer. The device is fabricated in MITEL’s double-poly ISO2-CMOS technology utilizing switched-capacitor techniques. Ordering Information MT8840AE 18 Pin Plastic DIP MT8840AS 18 Pin SOIC 0°C to +85°C Figure 1 - Functional Block Diagram OSC1 OSC2 CK32 ETC MTC FATC TxDI RxDO DET CRx VDD VSS VRef LOOP TCO TxO RxE RxI Timing and Control Tone Caller Modulator TX Bandpass Filter TX Post- Filter RX Pre- Filter R O U T I N AGC G RX Bandpass Filter Demodulator ISSUE 4 November 1990 ISO2-CMOS |
Similar Part No. - MT8840AS |
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Similar Description - MT8840AS |
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