Ultralow Noise and Spurious 0.37GHz to 6.39GHz Integer-N Synthesizer with Integrated VCO

The LTC6946 is a high performance, low noise, 6.39GHz phase-locked loop (PLL) with a fully integrated VCO, including a reference divider, phase-frequency detector (PFD) with phase-lock indicator, ultralow noise charge pump, integer feedback divider, and VCO output divider. The charge pump contains selectable high and low voltage clamps useful for VCO monitoring.

The integrated low noise VCO uses no external components. It is internally calibrated to the correct output frequency with no external system support.

The part features a buffered, programmable VCO output divider with a range of 1 through 6, providing a wide frequency range.

Frequency Coverage Options

LTC6946-1

LTC6946-2

LTC6946-3

LTC6946-4

0 DIV = 1

2.240 to 3.740

3.080 to 4.910

3.840 to 5.790

4.200 to 6.390

0 DIV = 2

1.120 to 1.870

1.540 to 2.455

1.920 to 2.895

2.100 to 3.195

0 DIV = 3

0.747 to 1.247

1.027 to 1.637

1.280 to 1.930

1.400 to 2.130

0 DIV = 4

0.560 to 0.935

0.770 to 1.228

0.960 to 1.448

1.050 to 1.598

0 DIV = 5

0.448 to 0.748

0.616 to 0.982

0.768 to 1.158

0.840 to 1.278

0 DIV = 6

0.373 to 0.623

0.513 to 0.818

0.640 to 0.965

0.700 to 1.065

Applications

* Wireless Base Stations (LTE, WiMAX, W-CDMA, PCS)

* Broadband Wireless Access

* Military and Secure Radio

* Test and Measurement

* Low Noise Integer-N PLL with Integrated VCO

* –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)

* Output Buffer Muting