Datasheet
Data Sheet AD9520-0
Rev. A | Page 11 of 80
CLOCK OUTPUT ABSOLUTE PHASE NOISE (INTERNAL VCO USED)
Table 7.
Parameter Min Typ Max Unit Test Conditions/Comments
LVPECL ABSOLUTE PHASE NOISE
Internal VCO; direct-to-LVPECL output
and for loop bandwidths < 1 kHz
VCO = 2.95 GHz; Output = 2.95 GHz
1 kHz Offset −46 dBc/Hz
10 kHz Offset −78 dBc/Hz
100 kHz Offset −104 dBc/Hz
1 MHz Offset −123 dBc/Hz
10 MHz Offset −139 dBc/Hz
40 MHz Offset −145 dBc/Hz
VCO = 2.75 GHz; Output = 2.75 GHz
1 kHz Offset −49 dBc/Hz
10 kHz Offset
−80
dBc/Hz
100 kHz Offset −106 dBc/Hz
1 MHz Offset −125 dBc/Hz
10 MHz Offset −140 dBc/Hz
40 MHz Offset −146 dBc/Hz
VCO = 2.55 GHz; Output = 2.55 GHz
1 kHz Offset −51 dBc/Hz
10 kHz Offset −82 dBc/Hz
100 kHz Offset −108 dBc/Hz
1 MHz Offset −127 dBc/Hz
10 MHz Offset −140 dBc/Hz
40 MHz Offset −146 dBc/Hz
CLOCK OUTPUT ABSOLUTE TIME JITTER (CLOCK GENERATION USING INTERNAL VCO)
Table 8.
Parameter Min Typ Max Unit Test Conditions/Comments
LVPECL OUTPUT ABSOLUTE TIME JITTER Application example based on a typical
setup where the reference source is
clean, so a wider PLL loop bandwidth is
used; reference = 15.36 MHz; R divider = 1
VCO = 2.949 GHz; LVPECL = 245.76 MHz; PLL LBW = 63 kHz 176 fs rms Integration BW = 200 kHz to 10 MHz
351 fs rms Integration BW = 12 kHz to 20 MHz
VCO = 2.703 GHz; LVPECL = 122.88 MHz; PLL LBW = 63 kHz 158 fs rms Integration BW = 200 kHz to 10 MHz
324 fs rms Integration BW = 12 kHz to 20 MHz
VCO = 2.703 GHz; LVPECL = 61.44 MHz; PLL LBW = 63 kHz 177 fs rms Integration BW = 200 kHz to 10 MHz
330 fs rms Integration BW = 12 kHz to 20 MHz
CLOCK OUTPUT ABSOLUTE TIME JITTER (CLOCK CLEANUP USING INTERNAL VCO)
Table 9.
Parameter Min Typ Max Unit Test Conditions/Comments
LVPECL OUTPUT ABSOLUTE TIME JITTER Application example based on a typical
setup where the reference source is jittery,
so a narrower PLL loop bandwidth is used;
reference = 19.44 MHz; R divider = 162
VCO = 2.799 GHz; LVPECL = 155.52 MHz; PLL LBW = 1.8 kHz
652
fs rms
Integration BW = 12 kHz to 20 MHz
VCO = 2.703 GHz; LVPECL = 122.88 MHz; PLL LBW = 2.1 kHz 607 fs rms Integration BW = 12 kHz to 20 MHz