Description
●The MT88L85 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.
●Features
●• External power down pin
●• Low voltage operation (2.7V - 3.6V)
●• 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
●• DTMF transmitter/receiver power down via register control
●Applications
●• Credit card systems
●• Paging systems
●• Repeater systems/mobile radio
●• Interconnect dialers
●• Personal computers