Low Power Voltage Controlled Oscillator Buffer

The MC12149 is intended for applications requiring high frequency signal generation up to 1300 MHz. 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 1.1 GHz Frequency Synthesizer to realize a complete PLL sub–system. The device is specified to operate over a voltage supply range of 2.7 to 5.5 V. It has a typical current consumption of 15 mA at 3.0 V which makes it attractive for battery operated handheld systems.

NOTE: The MC12149 is NOT suitable as a crystal oscillator.

• Operates Up to 1.3 GHz

• Space–Efficient 8–Pin SOIC or SSOP Package

• Low Power 15 mA Typical @ 3.0 V Operation

• Supply Voltage of 2.7 to 5.5 V

• Typical 900 MHz Performance

– Phase Noise –105 dBc/Hz @ 100 kHz Offset

– Tuning Voltage Sensitivity of 20 MHz/V

• Output Amplitude Adjustment Capability

• Two High Drive Outputs With a Typical Range from –8.0 to –2.0 dBm

• One Low–Drive Output for Interfacing to a Prescaler