Datasheet

AD9953
Rev. A | Page 11 of 32
Figure 16. Residual Phase Noise with F
OUT
= 159.5 MHz, F
CLK
= 400 MSPS
(Green), 4 × 100 MSPS (Red), and 20 × 20 MSPS (Blue)
CH1 200mVΩ
1
IT 4.0PS/PT 3.1nsM 200PS 20.0GS/S
A CH1 708mV
03374-0-031
t
1
= 3.156ns
t
2
= 3.04ns
Δ
t = –116.0PS
1/Δ
t = –8.621GHz
Figure 17. Residual Peak-to-Peak Jitter of DDS
and Comparator Operating Together at 160 MHz
Figure 18. Residual Phase Noise with F
OUT
= 9.5 MHz, F
CLK
= 400 MSPS (Green),
4 ×100 MSPS (Red), and 20 × 20 MSPS (Blue)
REF2 200mV 500ns IT 10.0PS/PT –100PSM 500PS 20.0GS/S
A CH1 708mV
R2
R1
03374-0-030
FALL (R1) = 396.4PS
RISE(R2) = 464.3PS
Figure 19. Comparator Rise and Fall Time at 160 MHz