AD9914SLASHPCBZ datasheet(14/45 Pages) AD

14 / 45 page

AD9914

Data Sheet

Rev. F | Page 14 of 45

100

10k

100k

10M

100M

FREQUENCY OFFSET (Hz)

–70

–90

–80

–100

–110

–120

–130

–140

–150

–160

–170

1396MHz

NORMALIZED

REF CLK SOURCE

Figure 16. Absolute Phase Noise Curves of Normalized REF CLK Source to

DDS Output at 1396 MHz (SYSCLK = 3.5 GHz)

–60

–90

–80

–70

–100

–110

–120

–130

–140

–150

–160

–170

–180

100

10k

100k

10M

100M

FREQUENCY OFFSET (Hz)

427MHz

1396MHz

696MHz

171MHz

Figure 17. Residual Phase Noise Curves

0.5

0.4

0.3

0.2

0.1

500

1000

4000

3500

3000

2500

2000

1500

SYSTEM CLOCK (MHz)

3.3V ANALOG

3.3V DIGITAL

1.8V ANALOG

1.8V DIGITAL

Figure 18. Power Supply Current vs. SYSCLK

100

10k

100k

10M

100M

FREQUENCY OFFSET (Hz)

–90

–80

–100

–110

–120

–130

–140

–150

–160

–170

978MHz

305MHz

497MHz

122MHz

Figure 19. Absolute Phase Noise Curves of DDS Output Using Internal PLL at

2.5 GHz Operation

100

10k

100k

10M

100M

FREQUENCY OFFSET (Hz)

1396MHz ABSOLUTE

1396MHz RESIDUAL

–60

–90

–80

–70

–100

–110

–120

–130

–140

–150

–160

Figure 20. Residual PN vs. Absolute PN Measurement Curves at 1396 MHz

–60

–90

–80

–70

–100

–110

–120

–130

–140

–150

–160

–170

–180

100

10k

100k

10M

100M

FREQUENCY OFFSET (Hz)

1396MHz ABSOLUTE

1396MHz RESIDUAL

Figure 21. Residual Phase Noise vs. Normalized Absolute REF CLK Source

Phase Noise at 1396 MHz

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