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.

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