The M-980-02 is a general-purpose call progress tone detector operating from 2.8 to 5.5 VDC power supply range. It covers the common call progress frequency from 315 to 640 Hz featuring an inexpensive ...
The M-980-02 is an integrated circuit tone detector for general purpose use in automatic following of switched telephone calls. The circuit uses low-power CMOS techniques to provide for this function.
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