Datasheet

AD9558 Data Sheet
Rev. B | Page 20 of 104
TYPICAL PERFORMANCE CHARACTERISTICS
f
R
= input reference clock frequency; f
OUT
= output clock frequency; f
SYS
= SYSCLK input frequency; f
S
= internal system clock frequency;
LF = SYSCLK PLL internal loop filter used. AVDD, AVDD3, and DVDD at nominal supply voltage; f
S
= 786.432 MHz, unless otherwise noted.
–160
–150
–140
–130
–120
–1
10
–100
–90
–80
–70
–60
1k100
10k
100k 1M
10M
100M
PHASE NOISE (dBc/Hz)
FREQUENCY OFFSET (Hz)
INTEGRATED RMS JITTER (12kHz TO 20MHz): 296fs
09758-003
Figure 3. Absolute Phase Noise (Output Driver = HSTL),
f
R
= 19.44 MHz, f
OUT
= 622.08 MHz,
DPLL Loop BW = 50 Hz, f
SYS
= 49.152 MHz Crystal
–160
–150
–140
–130
–120
–1
10
–100
–90
–80
–70
–60
1k
100
10k
100k 1M
10M
100M
PHASE NOISE (dBc/Hz)
FREQUENCY
OFFSET (Hz)
INTEGRATED RMS JITTER (12kHz TO 20MHz): 320fs
09758-004
Figure 4. Absolute Phase Noise (Output Driver = HSTL),
f
R
= 19.44 MHz, f
OUT
= 644.53125 MHz,
DPLL Loop BW = 50 Hz, f
SYS
= 49.152 MHz Crystal
–160
–150
–140
–130
–120
–110
–100
–90
–80
–70
–60
1k100
10k
100k 1M
10M
100M
PHASE NOISE (dBc/Hz)
FREQUENCY OFFSET (Hz)
INTEGRATED RMS JITTER (12kHz TO 20MHz): 285fs
09758-005
Figure 5. Absolute Phase Noise (Output Driver = HSTL),
f
R
= 19.44 MHz, f
OUT
= 693.482991 MHz,
DPLL Loop BW = 50 Hz, f
SYS
= 49.152 MHz Crystal
–160
–150
–140
–130
–120
–110
–100
–90
–80
–70
1k100
10k
100k 1M
10M
100M
PHASE NOISE (dBc/Hz)
FREQUENC
Y OFFSET (Hz)
INTEGRATED RMS JITTER (12kHz TO 20MHz): 301fs
09758-006
Figure 6. Absolute Phase Noise (Output Driver = HSTL),
f
R
= 19.44 MHz, f
OUT
= 174.703 MHz,
DPLL Loop BW = 1 kHz, f
SYS
= 49.152 MHz Crystal