Datasheet

Data Sheet AD9520-4
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 = 1.8 GHz; Output = 1.8 GHz
1 kHz Offset −54 dBc/Hz
10 kHz Offset −84 dBc/Hz
100 kHz Offset −108 dBc/Hz
1 MHz Offset −128 dBc/Hz
10 MHz Offset −143 dBc/Hz
40 MHz Offset −148 dBc/Hz
VCO = 1.625 GHz; Output = 1.625 GHz
1 kHz Offset −58 dBc/Hz
10 kHz Offset
−87
dBc/Hz
100 kHz Offset −111 dBc/Hz
1 MHz Offset −130 dBc/Hz
10 MHz Offset −144 dBc/Hz
40 MHz Offset −148 dBc/Hz
VCO = 1.45 GHz; Output = 1.45 GHz
1 kHz Offset −62 dBc/Hz
10 kHz Offset −91 dBc/Hz
100 kHz Offset −115 dBc/Hz
1 MHz Offset −133 dBc/Hz
10 MHz Offset −143 dBc/Hz
40 MHz Offset −148 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 = 1.475 GHz; LVPECL = 245.76 MHz; PLL LBW = 39 kHz 109 fs rms Integration BW = 200 kHz to 10 MHz
269 fs rms Integration BW = 12 kHz to 20 MHz
VCO = 1.475 GHz; LVPECL = 122.88 MHz; PLL LBW = 39 kHz 114 fs rms Integration BW = 200 kHz to 10 MHz
263 fs rms Integration BW = 12 kHz to 20 MHz
VCO = 1.475 GHz; LVPECL = 61.44 MHz; PLL LBW = 39 kHz 146 fs rms Integration BW = 200 kHz to 10 MHz
291 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 = 10.0 MHz; R divider = 20
VCO = 1.555 GHz; LVPECL = 155.52 MHz; PLL LBW = 1.8 kHz
440
fs rms
Integration BW = 12 kHz to 20 MHz
VCO = 1.474 GHz; LVPECL = 122.88 MHz; PLL LBW = 1.9 kHz 360 fs rms Integration BW = 12 kHz to 20 MHz