XR-2567

XR·2567 Dual Monolithic Tone Decoder GENERAL DESCRIPTION The XR-2567 is a dual monolithic tone decoder of the 567-type that is ideally suited for tone or frequency decoding in multiple-tone communication systems. Each decoder of the XR-2567 can be used independently or both sections can be interconnected for dual operation. The matching and temperature tracking characteristics between decoders on this monolithic chip are superior to those available from two separate tone decoder packages. The XR-2567 operates over a frequency range of 0.01 Hz to 500 kHz. Supply voltages can vary from 4.5V to 12V, with internal voltage regulation provided for supplies between 7V and 12V. Each decoder consists of a phase-locked loop (PLL), a quadrature AM detector, a voltage comparator, and a logic compatible output that can sink more than 100 mA of load current. The center frequency of each decoder is set by an external resistor and capacitor which determine the freerunning frequency of each PLL. ...