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LTC6948 Datasheet(PDF) 1 Page - Analog Devices |
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LTC6948 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 38 page  LTC6948 1 6948fa For more information www.linear.com/LTC6948 Typical applicaTion FeaTures DescripTion Ultralow Noise 0.37GHz to 6.39GHz Fractional-N Synthesizer with Integrated VCO 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 LTC6948-2 LTC6948-3 LTC6948-4 O_DIV = 1 2.240 to 3.740 3.080 to 4.910 3.840 to 5.790 4.200 to 6.390 O_DIV = 2 1.120 to 1.870 1.540 to 2.455 1.920 to 2.895 2.100 to 3.195 O_DIV = 3 0.747 to 1.247 1.027 to 1.637 1.280 to 1.930 1.400 to 2.130 O_DIV = 4 0.560 to 0.935 0.770 to 1.228 0.960 to 1.448 1.050 to 1.598 O_DIV = 5 0.448 to 0.748 0.616 to 0.982 0.768 to 1.158 0.840 to 1.278 O_DIV = 6 0.373 to 0.623 0.513 to 0.818 0.640 to 0.965 0.700 to 1.065 6.3GHz Wideband Receiver applicaTions n Low Noise Fractional-N PLL with Integrated VCO n No ∆-∑ Modulator Spurs n 18-Bit Fractional Denominator n –226 dBc/Hz Normalized In-Band Phase Noise Floor n –274 dBc/Hz Normalized In-Band 1/f Noise n –157 dBc/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 FracNWizard™ Software Design Tool Support n Wireless Basestations (LTE, WiMAX, W-CDMA, PCS) n Microwave Data Links n Military and Secure Radio n Test and Measurement L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and FracNWizard is a trademark of Analog Devices, Inc. All other trademarks are the property of their respective owners. UNUSED OUTPUT AVAILABLE FOR OTHER USE 50 0.1µF R = 2, fPFD = 50MHz N = 84 TO 127.8 LBW = 186kHz O = 1 0.01µF 1µF 0.01µF 5V 3.3V 0.1µF 68nH 68nH 0.01µF 3.3V 76.8 100pF 100pF 1.6nF 3.3V fLO = 4200MHz TO 6390MHz IN 190.7Hz STEPS LTC6948-4 STAT TUNE CS SDI VD+ LDO SCLK TB GND REF+ SDO CMC CMB CMA GND BVCO 0.1µF 100MHz 51.1 1µF 3.3V 1µF 0.1µF 3.3V 1µF 2.2µF 15 1µF 6948 TA01a SPI BUS 10µH RF INPUT SIGNAL IF OUTPUT IF LO RF 76.8 56nF 2.4nF LTC6948-4 Phase Noise, fRF = 6236MHz OFFSET FREQUENCY (Hz) –140 –130 –110 –90 100 10k 100k 10M 40M 6946 TA01b –150 1k 1M –100 –120 –160 RMS NOISE = 0.412° RMS JITTER = 183fs fPFD = 50MHz LOOP BW = 186kHz INTN = 0 CPLE = 1 |
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