AD9557 Datasheet, PDF (23/92 Pages) Analog Devices – Dual Input Multiservice

Data Sheet
3.4
3.0
2.6
2.2
1.8
1.4
1.0
0.6
2pF LOAD
10pF LOAD
0.2
–0.2
–1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
TIME (ns)
Figure 25. Output Waveform,
3.3 V CMOS (100 MHz, Strong Mode)
1.9
1.7
1.5
1.3
1.1
0.9
0.7
0.5
0.3
2pF LOAD
10pF LOAD
0.1
–0.1
–1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
TIME (ns)
Figure 26. Output Waveform, 1.8 V CMOS (100 MHz)
3.2
2pF LOAD
10pF LOAD
2.8
2.4
2.0
1.6
1.2
0.8
0.4
0
–5 5 15 25 35 45 55 65 75 85 95
TIME (ns)
Figure 27. Output Waveform, 3.3 V CMOS (20 MHz, Weak Mode)
AD9557
3
0
–3
–6
–9
–12
–15
–18
–21
–24
–27
–30
10
LOOP BW = 100Hz;
HIGH PHASE MARGIN;
PEAKING: 0.06dB; –3dB: 69Hz
LOOP BW = 2kHz;
HIGH PHASE MARGIN;
PEAKING: 0.097dB; –3dB: 1.23kHz
LOOP BW = 5kHz;
HIGH PHASE MARGIN;
PEAKING: 0.14dB; –3dB: 4.27kHz
100
1k
10k
FREQUENCY OFFSET (Hz)
100k
Figure 28. Closed-Loop Transfer Function for 100 Hz, 2 kHz, and 5 kHz Loop
Bandwidth Settings; High Phase Margin Loop Filter Setting
(This is compliant with Telcordia GR-253 jitter transfer test for loop
bandwidths < 2 kHz.)
3
0
–3
–6
–9
–12
–15
–18
–21
–24
–27
–30
10
LOOP BW = 100Hz;
NORMAL PHASE MARGIN;
PEAKING: 0.09dB; –3dB: 117Hz
LOOP BW = 2kHz;
NORMAL PHASE MARGIN;
PEAKING: 1.6dB; –3dB: 2.69kHz
100
1k
10k
FREQUENCY OFFSET (Hz)
100k
Figure 29. Closed-Loop Transfer Function for 100 Hz and 2 kHz Loop
Bandwidth Settings; Normal Phase Margin Loop Filter Setting
Rev. A | Page 23 of 92