GENERAL DESCRIPTION
All RF and IF tuning is accomplished automatically within the IC which eliminates manual tuning production costs and results in a highly reliable, extremely low-cost solution for high-volume wireless applications. The MICRF004 provides two fundamental modes of operation, fixed and sweep. In fixed mode, the device functions as a conventional superheterodyne receiver with an internal local oscillator operating at a single frequency based on an external reference crystal or clock. Fixed mode is for use with accurately-controlled transmitters utilizing crystal or SAW (surface acoustic wave) resonators. In sweep mode, the MICRF004 sweeps the internal local oscillator at rates greater than the baseband data rate. This effectively broadens the RF bandwidth of the receiver to a value equivalent to conventional superregenerative receivers. This allows the MICRF004 to operate with less expensive LC transmitters without additional components or tuning, even though the receiver topology is still superheterodyne.
Micrel
