AD9554 datasheet(23/116 Pages) AD

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Data Sheet

AD9554

Rev. D | Page 23 of 116

–0.8

–0.7

–0.6

–0.5

–0.4

–0.3

–0.2

–0.1

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

TIME (ns)

Figure 15. Output Waveform, 21 mA Mode (400 MHz)

with 100 Ω Termination at Load

–0.6

–0.5

–0.4

–0.3

–0.2

–0.1

0.1

0.2

0.3

0.4

0.5

0.6

TIME (ns)

Figure 16. Output Waveform, 14 mA LVDS-Compatible Mode (400 MHz)

with 100 Ω Termination at Load

–1.6

–1.4

–1.2

–1.0

–0.8

–0.6

–0.4

–0.2

1.4

1.2

1.0

0.8

0.6

0.4

0.2

1.6

025

TIME (ns)

NO TERMINATION

100Ω TERMINATION

Figure 17. Output Waveform, 21 mA Mode (100 MHz)

–1.2

–1.0

–0.8

–0.6

–0.4

–0.2

1.0

0.8

0.6

0.4

0.2

1.2

025

TIME (ns)

NO TERMINATION

100Ω TERMINATION

Figure 18. Output Waveform, 14 mA Mode (100 MHz)

–30

–27

–24

–21

–18

–15

–12

–9

–6

–3

100

10k

100k

OFFSET FREQUENCY (Hz)

LOOP BW = 100Hz

LOOP BW = 2kHz

LOOP BW = 4kHz

Figure 19. Closed-Loop Transfer Function for 100 Hz, 2 kHz, and 4 kHz Loop

Bandwidth Settings; High Phase Margin Loop Filter Setting;

Figure Compliant with Telcordia GR-253 Jitter Transfer Test for

Loop Bandwidths <2 kHz (Note that the bandwidth register setting is the

point where the open-loop gain = 0 dB.)

–30

–27

–24

–21

–18

–15

–12

–9

–6

–3

100

OFFSET FREQUENCY (Hz)

10k

100k

LOOP BW = 100Hz

PEAKING: 1.3dB. –3dB: 112Hz

LOOP BW = 2kHz

PEAKING: 1.1dB. –3dB: 2.4kHz

LOOP BW = 4kHz.

PEAKING: 1.1dB. –3dB: 5.3kHz

Figure 20. Closed-Loop Transfer Function for 100 Hz, 2 kHz, and 4 kHz Loop

Bandwidth Settings; Normal Phase Margin Loop Filter Setting (Note that the

bandwidth register setting is the point where the open-loop gain = 0 dB.)

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