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• Selec...
MT8840: 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 oscillator̶...
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Parameter | Symbol | Min | Max | Units | |
1 | Supply Voltage | VDD-VSS |
0.3 | +7.0 | V |
2 | Supply Voltage | VMax | VSS-0.3 | VDD+0.3 | V |
3 | Current On Any Pin | IMax | 20 | mA | |
4 | Storage temperature | TS | -65 | +150 | |
5 | Package power dissipation | PDiss |
850 |
mW |
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 of MT8840 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 MT8840 is fabricated in MITEL's double-poly ISO2-CMOS technology utilizing switched-capacitor techniques.