Datasheet
Data Sheet AD9547
Rev. E | Page 19 of 104
–160
–150
–140
–130
–120
–
110
–100
–90
–80
–70
100
1k
10k
100k 1M
10M
100M
PHASE NOISE (dBc/Hz)
FREQUENC
Y
OFFSET (Hz)
INTEGRATED RMS JITTER (PHASE NOISE):
5kHz TO 20MHz: 361fs (–69.0dBc)
20kHz TO 80MHz: 441fs (–67.3dBc) (EXTRAPOLATED)
08300-069
Figure 7. Additive Phase Noise (Output Driver = LVPECL),
f
REF
= 19.44 MHz, f
O
= 155.52 MHz,
LBW = 1 kHz, f
SYSCL K
= 50 MHz, PLL On
–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):
12kHz TO 20MHz: 245fs (–65.0dBc)
20kHz TO 80MHz: 300fs (–64.3dBc)
08300-051
Figure 8. Additive Phase Noise (Output Driver = LVPECL),
f
REF
= 19.44 MHz, f
O
= 155.52 MHz,
LBW = 1 kHz, f
SYSCL K
= 50 MHz (Crystal), PLL On with
2× Frequency Multiplier, I
CP
= 375 µA, LF = External (350 kHz)
ROHDE & SCHWARZ
SMA100 (1GHz)
ROHDE & SCHWARZ
SMA100 (50MHz)
20MHz OCXO
–170
–160
–150
–140
–130
–120
–1
10
–100
–90
100
1k
10k
100k 1M 10M
PHASE NOISE (dBc/Hz)
FREQUENCY OFFSET (Hz)
08300-053
Figure 9. Phase Noise of SYSCLK Input Sources
–160
–150
–140
–130
–120
–110
–100
–90
–80
–70
100 1k 10k 100k 1M 10M 100M
PHASE NOISE (dBc/Hz)
FREQUENCY OFFSET (Hz)
ROHDE & SCHWARZ
SMA100 (1GHz)
ROHDE & SCHWARZ
SMA100 (50MHz)
50MHz CRYSTAL
08300-058
Figure 10. Additive Phase Noise Comparison of SYSCLK Input Options
(Output Driver = LVPECL),
f
REF
= 19.44 MHz, f
O
= 311.04 MHz, LBW = 1 kHz
100
1k
10k 100k 1M
10M
100M
PHASE NOISE (dBc/Hz)
FREQUENCY OFFSET (Hz)
–160
–150
–140
–130
–120
–110
–100
–90
–80
–70
INTEGRATED RMS JITTER (PHASE NOISE):
5kHz TO 20MHz: 336fs (–69.7dBc)
20kHz TO 80MHz: 425fs (–67.6dBc)
08300-052
Figure 11. Additive Phase Noise (Output Driver = LVPECL),
f
REF
= 8 kHz, f
O
= 155.52 MHz,
LBW = 100 Hz, f
SYSCL K
= 50 MHz (Crystal), PLL On
–70
–60
–50
–40
–30
–20
–10
0
10
10
100
1k
10k
100k
FREQUENCY OFFSET (Hz)
CLOSED-LOO
P GAIN (dB)
C
LOSED-LOOP PEAKING: 0.04dB
08300-047
Figure 12. Jitter Transfer Bandwidth, Output Driver = LVPECL,
f
REF
= 19.44 MHz, f
O
= 155.52 MHz,
LBW = 100 Hz (Phase Margin = 88°), f
SYSCL K
= 1 GHz, PLL Off