LTC6948-4 Datasheet | Linear Technology

Features n LTC6948 Ultralow Noise 0.37GHz to 6.39GHz Fractional-N Synthesizer with Integrated VCO Description The LTC®6948 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), ultralow noise charge pump, fractional feedback divider, and VCO output divider. The fractional divider uses an advanced, 4th order Δ∑ modulator which provides exceptionally low spurious levels. This allows wide loop bandwidths, producing extremely low integrated phase noise values. The programmable VCO output divider, with a range of 1 through 6, extends the output frequency range. Output Frequency Options LTC6948-1 O_DIV = 1 O_DIV = 2 O_DIV = 3 O_DIV = 4 O_DIV = 5 O_DIV = 6 LTC6948-2 LTC6948-3 LTC6948-4 2.240 to 3.740 3.080 to 4.910 3.840 to 5.790 4.200 to 6.390 1.120 to 1.870 1.540 to 2.455 1.920 to 2.895 2.100 to 3.195 0.747 to 1.247 1.027 to 1.637 1.280 to 1.930 1.400 to 2.130 0.560 to 0.935 0.770 to 1.228 0.960 to 1.448 1.050 to 1.598 0.448 to 0.748 0.616 to 0.982 0.768 to 1.158 0.840 to 1.278 0.373 to 0.623 0.513 to 0.818 0.640 to 0.965 0.700 to 1.065 Low Noise Fractional-N PLL with Integrated VCO n No ∆-∑ Modulator Spurs n 18-Bit Fractional Denominator n - 226 d Bc/Hz Normalized In-Band Phase Noise Floor n - 274 d Bc/Hz Normalized In-Band 1/f Noise n - 157 d Bc/Hz Wideband Output Phase Noise Floor n Excellent Integer Boundary Spurious Performance n Output Divider (1 to 6, 50% Duty Cycle) n Output Buffer Muting n Reference Input Frequency Up to 425MHz n Fast Frequency Switching n Frac NWizard™ Software Design Tool Support Applications n n n n Wireless Basestations (LTE, Wi MAX, W-CDMA, PCS) Microwave Data Links Military and Secure Radio Test and Measurement L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Frac NWizard is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective...