Datasheet
Data Sheet AD9548
Rev. E | Page 19 of 112
–160
–150
–140
–130
–120
–110
–100
–90
–80
–70
100 1k 10k 100k 1M 10M 100M
PHASE NOISE (dBc/Hz)
FREQUENCY OFFSET (Hz)
INTEGRATED RMS JITTER (PHASE NOISE):
5kHz TO 20MHz: 361fs (–69.0dBc)
20kHz TO 80MHz: 441fs (–67.3dBc) (EXTRAPOLATED)
08022-069
Figure 7. Additive Phase Noise (Output Driver = LVPECL),
f
R
= 19.44 MHz, f
O
= 155.52 MHz,
LBW = 1 kHz, f
SYS
= 50 MHz, PLL On
–160
–150
–140
–130
–120
–110
–100
–90
–80
–70
10
100 1k 10k 100k 1M
10M
100M
PHASE NOISE (dBc/Hz)
FREQUENCY OFFSET (Hz)
INTEGRATED RMS JITTER (PHASE NOISE):
5kHz TO 10MHz: 717fs (–65.1dBc)
12kHz TO 20MHz: 725fs (–65.0dBc)
20kHz TO 80MHz: 790fs (–64.3dBc)
08022-044
Figure 8. Additive Phase Noise (Output Driver = LVPECL),
f
R
= 1 Hz, f
O
= 122.88 MHz,
LBW = 0.05 Hz, f
SYS
= 20 MHz (OCXO), PLL On
100
1k
10k
100k
1M
10M
100M
PHASE NOISE (dBc/Hz)
FREQUENCY
OFFSET (Hz)
–160
–150
–140
–130
–120
–1
10
–100
–90
–80
–70
INTEGRATED RMS JITTER (PHASE NOISE):
5kHz TO 20MHz: 336fs (–69.7dBc)
20kHz TO 80MHz: 425fs (–67.6dBc) (EXTRAPOLATED)
08022-052
Figure 9. Additive Phase Noise (Output Driver = LVPECL),
f
R
= 8 kHz, f
O
= 155.52 MHz,
LBW = 100 Hz, f
SYS
= 50 MHz (Crystal), PLL On
–160
–150
–140
–130
–120
–110
–100
–90
–80
–70
100
1k
10k 100k 1M
10M
100M
PHASE NOISE (dBc/Hz)
FREQUENCY (Hz)
ROHDE & SCHWARZ
SMA100 (1GHz)
ROHDE & SCHWARZ
SMA100 (50MHz)
50MHz CRYSTAL
08022-058
Figure 10. Additive Phase Noise Comparison of SYSCLK Input Options
(Output Driver = LVPECL),
f
R
= 19.44 MHz, f
O
= 311.04 MHz, LBW = 1 kHz
–160
–150
–140
–130
–120
–1
10
–100
–90
–80
–70
100
1k
10k
100k
1M 10M 100M
PHASE NOISE (dBc/Hz)
FREQUENCY OFFSET (Hz)
INTEGRATED RMS JITTER (PHASE NOISE):
5kHz TO 20MHz: 356fs (–69.2dBc)
20kHz TO 80MHz: 435fs (–67.4dBc) (EXTRAPOLATED)
08022-054
Figure 11. Additive Phase Noise (Output Driver = LVPECL),
f
R
= 1 Hz, f
O
= 155.52 MHz,
LBW = 0.05 Hz, f
SYS
= 50 MHz, PLL On
–160
–150
–140
–130
–120
–1
10
–100
–90
–80
–70
100
1k
10k 100k 1M
10M
100M
PHASE NOISE (dBc/Hz)
FREQUENCY OFFSET (Hz)
INTEGRATED RMS JITTER (PHASE NOISE):
5kHz TO 20MHz: 245fs (–72.4dBc)
20kHz TO 80MHz: 300fs (–64.3dBc) (EXTRAPOLATED)
08022-051
Figure 12. Additive Phase Noise (Output Driver = LVPECL) ,
f
R
= 19.44 MHz, f
O
= 155.52 MHz,
LBW = 1 kHz, f
SYS
= 50 MHz (Crystal), PLL On with
2x Frequency Multiplier, I
CP
= 375 μA, LF = External (350 kHz)