Description
●The MT88L70 is a complete 3 Volt, DTMF receiver integrating both the bandsplit filter and digital decoder functions. The filter section uses switched capacitor techniques for high and low group filters; the decoder uses digital counting techniques to detect and decode all 16 DTMF tone pairs into a 4-bit code. External component count is minimized by on chip provision of a differential input amplifier, clock oscillator and latched three-state bus interface.
●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
●• Functionally compatible with Mitel’s MT8870D
●Applications
●• Paging systems
●• Repeater systems/mobile radio
●• Credit card systems
●• Remote control
●• Personal computers
●• Telephone answering machine
