Datasheet

AD9548 Data Sheet
Rev. E | Page 20 of 112
ROHDE & SCHWARZ
SMA100 (1GHz)
ROHDE & SCHWARZ
SMA100 (50MHz)
20MHz OCXO
–170
–160
–150
–140
–130
–120
–110
–100
–90
100 1k 10k 100k 1M 10M
PHASE NOISE (dBc/Hz)
FREQUENCY OFFSET (Hz)
08022-053
Figure 13. Phase Noise of SYSCLK Input Sources
LVDS
0
0.2
0.4
0.6
0.8
1.0
0 100 200 300 400 500 600 700
AMPLITUDE (V)
FREQUENCY (MHz)
LVPECL
08022-049
Figure 14. Amplitude vs. Toggle Rate,
LVPECL and LVDS
10pF LOAD
20pF LOAD
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0
100 200
300
400
500
AMPLITUDE (V)
FREQUENCY (MHz)
08022-055
Figure 15. Amplitude vs. Toggle Rate,
3.3 V CMOS (Strong Mode)
–70
–60
–50
–40
–30
–20
–10
0
10
10
100
1k
10k
100k
FREQUENCY OFFSET (Hz)
CLOSED-LOOP GAIN (dB)
08022-047
CLOSED-LOOP PEAKING: 0.04dB
Figure 16. Jitter Transfer Bandwidth, Output Driver = LVPECL,
f
R
= 19.44 MHz, f
O
= 155.52 MHz,
LBW = 100 Hz (Phase Margin = 88°), f
SYS
= 1 GHz, PLL Off
AMPLITUDE (V)
FREQUENCY (MHz)
08022-062
0.5
1.0
1.5
2.0
0
50
100
150 250
200
5pF LOAD
10pF LOAD
20pF LOAD
Figure 17. Amplitude vs. Toggle Rate,
1.8 V CMOS
10pF LOAD
5pF LOAD
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0 10 20 30 40 50
AMPLITUDE (V)
FREQUENCY (MHz)
08022-063
Figure 18. Amplitude vs. Toggle Rate,
3.3 V CMOS (Weak Mode)