Datasheet

AD9516-3 Data Sheet
Rev. C | Page 20 of 80
–140
–145
–150
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0.1 1 10010
PFD PHASE NOISE REFERRED TO PFD INPUT
(dBc/Hz)
PFD FREQUENCY (MHz)
06422-013
Figure 13. PFD Phase Noise Referred to PFD Input vs. PFD Frequency
–210
–224
–222
–220
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0 2.52.0
1.5 1.00.5
PLL FIGURE OF MERIT (dBc/Hz)
SLEW RATE (V/ns)
06422-136
Figure 14. PLL Figure of Merit (FOM) vs. Slew Rate at REFIN/
REFIN
1.9
1.7
1.5
1.3
1.1
0.9
1.7 1.8 1.9 2.0 2.1 2.2 2.3
VCO TUNING VOLTAGE (V)
VCO FREQUENCY (GHz)
06422-138
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.)
–110
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–90
–80
–70
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–50
–40
–30
–20
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10
0
CENTER 122.88MHz SPAN 50MHz5MHz/DIV
RELATIVE POWER (dB)
06422-137
Figure 16. PFD/CP Spurs; 122.88 MHz; PFD = 15.36 MHz;
LBW = 127 kHz; I
CP
= 3.0 mA; F
VCO
= 2.21 GHz
–110
–100
–90
–80
–70
–60
–50
–40
–30
–20
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10
0
CENTER 122.88MHz SPAN 1MHz100kHz/DIV
RELATIVE POWER (dB)
06422-135
Figure 17. Output Spectrum, LVPECL; 122.88 MHz; PFD = 15.36 MHz;
LBW = 127 kHz; I
CP
= 3.0 mA; F
VCO
= 2.21 GHz
–110
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
10
0
CENTER 122.88MHz
SPAN 1MHz100kHz/DIV
RELATIVE POWER (dB)
06422-134
Figure 18. Output Spectrum, LVDS; 122.88 MHz; PFD = 15.36 MHz;
LBW = 127 kHz; I
CP
= 3.0 mA; F
VCO
= 2.21 GHz