AD9912ASLASHPCBZ datasheet(13/40 Pages) AD

13 / 40 page

AD9912

Rev. F | Page 13 of 40

100

10k

100k

10M

100M

FREQUENCY OFFSET (Hz)

–100

–110

–120

–130

–140

–150

800MHz

600MHz

RMS JITTER (100Hz TO 100MHz):

600MHz:

800MHz:

585fs

406fs

Figure 15. Absolute Phase Noise Using HSTL Driver,

SYSCLK = 1 GHz Wenzel Oscillator (SYSCLK PLL Bypassed),

HSTL Output Doubler Enabled

100

10k

100k

10M

100M

FREQUENCY OFFSET (Hz)

–110

–120

–130

–140

–150

–160

150MHz

50MHz

10MHz

RMS JITTER (100Hz TO 20MHz):

150MHz:

50MHz:

308fs

737fs

Figure 16. Absolute Phase Noise Using CMOS Driver at 3.3 V,

SYSCLK = 1 GHz Wenzel Oscillator (SYSCLK PLL Bypassed)

DDS Run at 200 MSPS for 10 MHz Plot

100

10k

100k

10M

100M

FREQUENCY OFFSET (Hz)

–110

–120

–130

–140

–150

–160

50MHz

10MHz

RMS JITTER (100Hz TO 20MHz):

50MHz:

790fs

Figure 17. Absolute Phase Noise Using CMOS Driver at 1.8 V,

SYSCLK = 1 GHz Wenzel Oscillator (SYSCLK PLL Bypassed)

250

375

500

625

750

875

1000

SYSTEM CLOCK FREQUENCY (MHz)

800

700

600

500

400

300

200

100

TOTAL

3.3V

1.8V

Figure 18. Power Dissipation vs. System Clock Frequency

(SYSCLK PLL Bypassed), fOUT = fSYSCLK/5, HSTL Driver On, CMOS Driver On,

SpurKiller Off

100

200

300

400

OUTPUT FREQUENCY (MHz)

800

700

600

500

400

300

200

100

TOTAL

3.3V

1.8V

Figure 19. Power Dissipation vs. Output Frequency

SYSCLK = 1 GHz (SYSCLK PLL Bypassed), HSTL Driver On,

CMOS Driver On, SpurKiller Off

100

200

300

400

500

FREQUENCY (MHz)

–20

–30

–40

–10

–50

–60

–70

–80

–90

–100

CARRIER:

SFDR W/O SPURKILLER:

SFDR WITH SPURKILLER:

FREQUENCY SPAN:

RESOLUTION BW:

VIDEO BW:

399MHz

–63.7dBc

–69.3dBc

500MHz

3kHz

30kHz

THESE TWO SPURS

ELIMINATED WITH

SPURKILLER

Figure 20. SFDR Comparison With and Without SpurKiller,

SYSCLK = 1 GHz, fOUT = 400 MHz

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