The MC12149 is intended for applications requiring high frequency
signal generation up to 1300MHz. An external tank circuit is used to
determine the desired frequency of operation. The VCO is realized using
an emitter–coupled pair topology. The MC12149 can be used with an
integrated PLL IC such as the MC12202 1.1GHz Frequency Synthesizer
to realize a complete PLL sub–system. The device is specified to operate
over a voltage supply range of 2.7V to 5.5V. It has a typical current
consumption of 15mA at 3V which makes it attractive for battery operated
handheld systems.