MT88L70 Datasheet PDF - Zarlink

●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 Zarlink’s MT8870D

●Applications

●• Paging systems

●• Repeater systems/mobile radio

●• Credit card systems

●• Remote control

●• Personal computers

●• Telephone answering machine