AD9854 Analog Devices, AD9854 Datasheet - Page 11

• Manufacturer Part Number: AD9854
• Description: CMOS 300 MHz Quadrature Complete-DDS
• Manufacturer: Analog Devices

Figure 20. Supply Current vs. Output Frequency; Variation
Is Minimal as a Percentage and Heavily Dependent on
Tuning Word
REV. 0
Figure 19. SFDR vs. DAC Current, 59.1 A
EXTCLK
a. Residual Phase Noise, 300 MHz Direct Clocking
–110
–115
–120
–125
–130
–135
–140
–145
–150
–155
620
615
610
605
600
595
590
55
54
53
52
51
50
49
48
100
0
0
Figure 18. Residual Phase Noise (5.2 MHz A
20
5
40
1k
DAC CURRENT – mA
FREQUENCY – MHz
FREQUENCY – Hz
80MHz
10
5MHz
60
80
15
10k
100
20
OUT
120
, 300 MHz
100k
140
25
OUT
–11–
), REFCLK Multiplier Disabled, EXTCLK = 300 MHz
b. Residual Phase Noise, 300 MHz (10 REFCLK Multiplier
Enabled)
Figure 21. Typical Comparator Output Jitter, 40 MHz
A
–110
–115
–120
–125
–130
–135
–140
–145
–150
–155
OUT
100
500ps/DIV
CH1
, 300 MHz EXTCLK/REFCLK Multiplier Disabled
Figure 22. Comparator Rise/Fall Times
500mV
RISE TIME
1.04ns
232mV/DIV
1k
FREQUENCY – Hz
5MHz
80MHz
–33ps
M 500ps CH1
10k
50
0ps
INPUT
980mV
AD9854
[10.6ps RMS]
JITTER
100k
+33ps
REF1 RISE
1.174ns
C1 FALL
1.286ns