RC2211

The RC2211 is a monolithic phase-locked loop (PLL) system especially designed for data communications. RC2211 is particularly well-suited for FSK modem applications, and operates over a wide frequency range of 0.01 Hz to 300 kHz. RC2211 can accommodate analog signals between 2 mV and 3V, and can interface with conventional DTL, TTL and ECL logic families. The circuit consists of a basic PLL for tracking an input signal frequency within the passband, a quadrature phase detector which provides carrier detection, and an FSK voltage comparator which provides FSK demodulation. External components are used to indepen- dently set carrier frequency, bandwidth and output delay.