Analog Devices AD9854 User Manual

AD9854
Rev. E | Page 14 of 52
Figure 16 and Figure 17 show the narrow-band performance of the AD9854 when operating with a 200 MHz reference clock with the
REFCLK multiplier bypassed vs. a 20 MHz reference clock and the REFCLK multiplier enabled at 10×.
0
CENTER 39.1MHz
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
5kHz/ SPAN 50kHz
00636-016
Figure 16. Narrow-Band SFDR, 39.1 MHz, 50 kHz BW,
200 MHz REFCLK with REFCLK Multiplier Bypassed
0
CENTER 39.1MHz
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
5kHz/ SPAN 50kHz
00636-017
Figure 17. Narrow-Band SFDR, 39.1 MHz, 50 kHz BW,
20 MHz REFCLK with REFCLK Multiplier = 10×
–
100
–110
–150
–120
–130
–140
–160
–170
PHASE NOISE (dBc/Hz)
A
OUT
= 80MHz
A
OUT
=5MHz
FREQUENCY (Hz)
10 1M100 100k10k1k
00636-018
Figure 18. Residual Phase Noise,
300 MHz REFCLK with REFCLK Multiplier Bypassed
FREQUENCY (Hz)
–
90
–100
–140
–110
–120
–130
–150
–160
10 1M100 100k10k1k
PHASE NOISE (dBc/Hz)
A
OUT
=80MHz
A
OUT
=5MHz
00636-019
Figure 19. Residual Phase Noise,
30 MHz REFCLK with REFCLK Multiplier = 10×
DAC CURRENT (mA)
55
0 5 10 15 20 25
SFDR (dBc)
54
53
52
51
50
49
48
00636-020
Figure 20. SFDR vs. DAC Current, 59.1 A
OUT
,
300 MHz REFCLK with REFCLK Multiplier Bypassed
FREQUENCY (MHz)
620
0
SUPPLY CURRENT (mA)
615
610
605
600
595
590
20 40 60 80 100 120 140
00636-021
Figure 21. Supply Current vs. Output Frequency (Variation Is Minimal,
Expressed as a Percentage, and Heavily Dependent on Tuning Word)

Analog Devices AD9854 Specifications

General

Brand	Analog Devices
Model	AD9854
Category	Synthesizer
Language	English