AD9518-4 datasheet(17/64 Pages) AD

17 / 64 page

Data Sheet

AD9518-4

Rev. B | Page 17 of 64

2.1

0.9

1.1

1.3

1.5

1.7

1.9

1.45

1.55

1.65

1.75

1.50

1.60

1.70

1.80

FREQUENCY (GHz)

Figure 11. VCO Tuning Voltage vs. Frequency

(Note that VCO calibration centers the dc tuning voltage

for the PLL setup that is active during calibration.)

–110

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

CENTER 122.88MHz

SPAN 50MHz

5MHz/DIV

Figure 12. PFD/CP Spurs; 122.88 MHz; PFD = 15.36 MHz;

LBW = 135 kHz; ICP = 3 mA; fVCO = 1.475 GHz

–110

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

CENTER 122.88MHz

SPAN 1MHz

100kHz/DIV

Figure 13. Output Spectrum, LVPECL; 122.88 MHz; PFD = 15.36 MHz;

LBW = 135 kHz; ICP = 3 mA; fVCO = 1.475 GHz

1.0

0.6

0.2

–0.2

–0.6

–1.0

TIME (ns)

Figure 14. LVPECL Output (Differential) at 100 MHz

1.0

0.6

0.2

–0.2

–0.6

–1.0

TIME (ns)

Figure 15. LVPECL Output (Differential) at 1600 MHz

1600

800

1000

1200

1400

FREQUENCY (GHz)

Figure 16. LVPECL Differential Swing vs. Frequency,

Using a Differential Probe Across the Output Pair

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