Datasheet

AD9954
Rev. B | Page 12 of 40
f (Hz)
L(f) (dBc/Hz)
10
–170
–160
–150
–140
–130
–120
–110
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
1k100 100k 1M10k 10M
03374-028
Figure 17. Residual Phase Noise with f
OUT
= 159.5 MHz,
f
CLK
= 400 MSPS; PLL Bypassed (Green), PLL Set to 4× (Red), and
PLL Set to 20× (Blue)
10
–170
–160
–150
–140
–130
–120
–110
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
1k100 100k10k 1M
03374-029
f (Hz)
L(f) (dBc/Hz)
Figure 18. Residual Phase Noise with f
OUT
= 9.5 MHz, f
CLK
= 400 MSPS;
PLL Bypassed (Green), PLL Set to 4× (Red), and PLL Set to 20× (Blue)
REF2 200mV 500ns
R2
R1
IT 10.0PS/PT –100PSM 500PS 20.0GS/S
A CH1 708mV
03374-030
FALL (R1) = 396.4PS
RISE(R2) = 464.3PS
Figure 19. Comparator Rise and Fall Time at 160 MHz