® ISO2-CMOS MT88L70 3 Volt Integrated DTMF Receiver Features • • • • • • • • • 2.
7 - 3.
6 volt operation Complete DTMF receiver Low power consumption Internal gain setting amplifier Adjustable guard time Central office quality Power-down mode Inhibit mode ISSUE 2 May 1995 Functionally compatible with Mitel’s MT8870D Applications • • • • • • Paging systems Repeater systems/mobile radio Credit card systems Remote control Personal computers Telephone answering machine PWDN IN + IN GS m o .
c U 4 t e e h S a t a .
D w w w Description VDD VSS VRef INH Bias Circuit VRef Buffer Chip Chip Power Bias High Group Filter Digital Detection Algorithm Code Converter and Latch Dial Tone Filter Zer...

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