MT88L85

MT88L85 3V Integrated DTMF Transceiver with Power-Down and Adaptive Micro Interface Features Complete DTMF transmitter/receiver Low voltage operation (2.7-3.6V) Adaptive micro interface enables compatibility with Intel and Motorola processors DTMF transmitter/receiver power-down via register control or power-down pin Adjustable guard time Automatic tone burst mode Call progress tone detection to -30dBm DS5032 ISSUE 3 January 1999 Ordering Information MT88L85AE 24 Pin Plastic DIP (300 mil) MT88L85AN 24 Pin SSOP MT88L85AP 28 Pin PLCC -40°C to +85°C 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. 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. Applications Credit card systems Paging systems Repeater systems/mobile radio Interconnect dialers Pay phones Remote monitor/Control systems TONE ∑ w IN+ INGS OSC1 OSC2 + - w Dial Tone Filter .D w D/A Converters t a S a Row and Column Counters e h t e U 4 .c m o The MT88L85 utilizes an adaptive micro interface, which allows the device to be co...