HopeRF\'s RF01 is a single chip, low power, multi-channel FSK receiver designed for use in applications requiring FCC or ETSI conformance for unlicensed use in the bands at 315, 433, 868 and 915 MHz. Used in conjunction with RF02A or RF02B, HopeRF\'s FSK transmitter, the RF01 is a flexible, low cost and highly integrated solution that does not require production alignments. All required RF functions are integrated. Only an external crystal and bypass filtering are needed for operation.