Ultralow Noise Fractional-N Synthesizer OUT DIV REF DIV VCO FRAC-N DIV MOD Phase Noise (dBc/Hz) Agilent E5052A Signal Source Analyzer –20 –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 –130 –140 –150 –160 –170 –180 Carrier 6.206 GHz –3.50 dBm RMS Noise: 6.77721 mrad 388.306 mdeg RMS Jitter: 173.952 fsec 1K 10K 100K 1M 10M Offset Frequency (Hz) -Based Synthesizer Achieves Integer-N Spurious Performance Our new ultralow noise fractional-N PLL synthesizers deliver best-in-class phase noise performance, and also provide exceptionally low spurious levels due to an advanced modulator. With modulator spurious levels in the noise, designers can confidently architect a frequency plan without unexpected spurious frequencies in the output spectrum. Predictable spurious performance ensures peace of mind when designing with our fractional-N PLLs. Features •Low –226dBc/Hz Normalized In-Band Phase Noise Floor • –274dBc/Hz Normalized In-Band 1/f Noise • –157dBc/Hz Wideband Output Phase Noise Floor • Programmable 1 to 6 Output Divider • 28-Lead (4mm x 5mm) QFN Package PLL Family Part No. Features LTC 6945 Integer-N, PLL ® Freq. Range (GHz) Info & Free Samples www.linear.com/product/LTC6948 1-800-4-LINEAR 0.350 to 6.0 LTC6946 Integer-N, PLL + VCO 0.373 to 6.39 LTC6947 Frac-N, PLL 0.350 to 6.0 LTC6948 Frac-N, PLL + VCO 0.373 to 6.39 Get the www.linear.com/fracnwizard , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and FracNWizard is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.