Ultralow Noise Fractional-N Synthesizer

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
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