The FX828D2 by CML Microcircuits is a highly integrated 2-channel transceiver for narrowband FSK and MSK applications. It features two IF channels with integrated audio and data demodulation, integrated PLL frequency synthesizer, mixer and low-IF filter, and integrated RF amplifier. It provides high rejection of image responses through a combination of Low-IF and IF filter. The FX828D2 also has various optional features including selectable filter bandwidths and IF Tracking Circuits. The device is housed in a 4x4 mm QFN package and is used for a variety of communication applications, such as marine communications and remote data nodes.