AD9958SLASHPCB datasheet(13/40 Pages) AD

13 / 40 page

AD9958

Rev. 0 | Page 13 of 40

–170

–160

–150

–140

–130

–120

–110

–100

100

10k

100k

10M

FREQUENCY OFFSET (Hz)

75.1MHz

100.3MHz

40.1MHz

15.1MHz

Figure 18. Residual Phase Noise (SSB) with fOUT = 15.1 MHz, 40.1MHz,

75.1 MHz, 100.3 MHz, fCLK = 500 MHz with REF_CLK Multiplier Bypassed

–70

–170

10M

FREQUENCY OFFSET (Hz)

–80

–90

–100

–110

–120

–130

–140

–150

–160

100

10k

100k

100.3MHz

75.1MHz

15.1MHz

40.1MHz

Figure 19. Residual Phase Noise (SSB) with fOUT = 15.1 MHz, 40.1MHz,

75.1 MHz, 100.3 MHz, fCLK = 500 MHz with REF_CLK Multiplier = 5x

–70

–170

10M

FREQUENCY OFFSET (Hz)

–80

–90

–100

–110

–120

–130

–140

–150

–160

100

10k

100k

100.3MHz

75.1MHz

15.1MHz

40.1MHz

Figure 20. Residual Phase Noise(SSB) with fOUT = 15.1 MHz, 40.1MHz,

75.1 MHz,100.3 MHz, fCLK = 500 MHz with REF_CLK Multiplier = 20×

–60

–85

25.3

200.3

FREQUENCY OF COUPLING SPUR (MHz)

–65

–70

–75

–80

50.3

75.3

100.3

125.3

150.3

175.3

SEPARATED DAC POWER PLANES

SINGLE DAC POWER PLANE

Figure 21. Channel Isolation at 500 MSPS Operation. Conditions are Channel

of Interest Fixed at 110.3 MHz, the Other Channels Are Frequency Swept.

600

500

REFERENCE CLOCK FREQUENCY (MHz)

500

400

300

200

100

450

400

350

300

250

200

150

100

2 CHANNELS ON

1 CHANNEL ON

Figure 22. Reference Clock Frequency vs. Power Dissipation vs. Channel(s)

Power On/Off

–45

–75

1.1

FOUT (MHz)

–50

–55

–60

–65

–70

15.1

40.1

75.1

100.3

200.3

SFDR AVERAGED

Figure 23. Averaged Channel SFDR vs. fOUT

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