Description
The MT8888C 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
• Central office quality DTMF transmitter/receiver
• Low power consumption
• High speed Intel micro interface
• Adjustable guard time
• Automatic tone burst mode
• Call progress tone detection to -30dBm

Applications
• Credit card systems
• Paging systems
• Repeater systems/mobile radio
• Interconnect dialers
• Personal computers