Datasheet

AD9516-1 Data Sheet
Rev. C | Page 20 of 80
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0.1 1 10010
PFD PHASE NOISE REFERRED TO PFD INPUT
(dBc/Hz)
PFD FREQUENCY (MHz)
06420-013
Figure 13. PFD Phase Noise Referred to PFD Input vs. PFD Frequency
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0 2.52.0
1.5 1.00.5
PLL FIGURE OF MERIT (dBc/Hz)
SLEW RATE (V/ns)
06420-136
Figure 14. PLL Figure of Merit (FOM) vs. Slew Rate at REFIN/
REFIN
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
2.3 2.4 2.5 2.6 2.7
VCO TUNING VOLTAGE (V)
FREQUENCY (GHz)
06420-138
Figure 15. VCO Tuning Voltage vs. Frequency
(Note that VCO calibration centers the dc tuning voltage
for the PLL setup that is active during calibration.)
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10
0
CENTER 122.88MHz SPAN 50MHz
5MHz/DIV
RELATIVE POWER (dB)
06420-137
Figure 16. PFD/CP Spurs; 122.88 MHz; PFD = 15.36 MHz;
LBW = 55 kHz; I
CP
= 4.8 mA; F
VCO
= 2.46 GHz
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10
0
CENTER 122.88MHz SPAN 1MHz100kHz/DIV
RELATIVE POWER (dB)
06420-135
Figure 17. Output Spectrum, LVPECL; 122.88 MHz; PFD = 15.36 MHz;
LBW = 55 kHz; I
CP
= 4.8 mA; F
VCO
= 2.46 GHz
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10
0
CENTER 122.88MHz SPAN 1MHz100kHz/DIV
RELATIVE POWER (dB)
06420-134
Figure 18. Output Spectrum, LVDS; 122.88 MHz; PFD = 15.36 MHz;
LBW = 55 kHz; I
CP
= 4.8 mA; F
VCO
= 2.46 GHz