Si4421 Universal ISM Band FSK Transceiver DESCRIPTION Silicon Labs’ Si4421 is a single chip, low power, multi-channel FSK transceiver designed for use in applications requiring FCC or ETSI conformance for unlicensed use in the 433, 868 and 915 MHz bands.
The Si4421 transceiver is a part of Silicon Labs’ EZRadioTM product line, which produces a flexible, low cost, and highly integrated solution that does not require production alignments.
The chip is a complete analog RF and baseband transceiver including a multi-band PLL synthesizer with PA, LNA, I/Q down converter mixers, baseband filters and amplifiers, and an I/Q demodulator.
All required RF functions are integrated.
Only an external crys...

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