DESCRIPTION
The LTC®6945 is a high performance, low noise, 6GHz phase locked loop (PLL), including a reference divider, phase frequency detector (PFD) with phase-lock indicator, charge pump, integer feedback divider and VCO output divider.
The part features a buffered, programmable VCO output divider with a range of 1 through 6. The differential, low noise output buffer has user-programmable output power ranging from –6dBm to 3dBm, and may be muted through either a digital input pin or software.

FEATURES
■ Low Noise Integer-N PLL
■ 350MHz to 6GHz VCO Input Range
■ –226dBc/Hz Normalized In-Band Phase Noise Floor
■ –274dBc/Hz Normalized In-Band 1/f Noise
■ –157dBc/Hz Wideband Output Phase Noise Floor
■ Excellent Spurious Performance
■ Output Divider (1 to 6, 50% Duty Cycle)
■ Low Noise Reference Buffer
■ Output Buffer Muting
■ Charge Pump Supply from 3.15V to 5.25V
■ Charge Pump Current from 250μA to 11.2mA
■ Configurable Status Output
■ SPI Compatible Serial Port Control
■ PLLWizard™ Software Design Tool Support

APPLICATIONS
■ Wireless Base Stations (LTE, WiMAX, W-CDMA, PCS)
■ Broadband Wireless Access
■ Microwave Data Links
■ Military and Secure Radio
■ Test and Measurement