Datasheet

AD9577 Data Sheet
Rev. 0 | Page 6 of 44
PLL2 FRACTIONAL-N MODE CHARACTERISTICS
Table 3. Bleed = 1
Parameter Min Typ Max Unit Test Conditions/Comments
1
NOISE CHARACTERISTICS 25 MHz crystal used
Phase Noise (155.52 MHz LVPECL Output) Nb = 87, FRAC = 57, MOD = 625, Vx = 2, Dx = 7
@ 1 kHz −107 dBc/Hz
@ 10 kHz −115 dBc/Hz
@ 100 kHz −122 dBc/Hz
@ 1 MHz −146 dBc/Hz
@ 10 MHz −153 dBc/Hz
@ 30 MHz −152 dBc/Hz
Phase Noise (622.08 MHz LVPECL Output) Nb = 99, FRAC = 333, MOD = 625, Vx = 2, Dx = 2
@ 1 kHz −95 dBc/Hz
@ 10 kHz −103 dBc/Hz
@ 100 kHz −109 dBc/Hz
@ 1 MHz −133 dBc/Hz
@ 10 MHz −148 dBc/Hz
@ 30 MHz −150 dBc/Hz
Phase Noise (155.52 MHz LVDS Output) Nb = 87, FRAC = 57, MOD = 625, Vx = 2, Dx = 7
@ 1 kHz −107 dBc/Hz
@ 10 kHz −114 dBc/Hz
@ 100 kHz −122 dBc/Hz
@ 1 MHz −145 dBc/Hz
@ 10 MHz −154 dBc/Hz
@ 30 MHz −154 dBc/Hz
Phase Noise (622.08 MHz LVDS Output) Nb = 99, FRAC = 333, MOD = 625, Vx = 2, Dx = 2
@ 1 kHz −95 dBc/Hz
@ 10 kHz −103 dBc/Hz
@ 100 kHz −109 dBc/Hz
@ 1 MHz −132 dBc/Hz
@ 10 MHz −147 dBc/Hz
@ 30 MHz −149 dBc/Hz
Phase Noise (155.52 MHz CMOS Output) Nb = 87, FRAC = 57, MOD = 625, Vx = 2, Dx = 7
@ 1 kHz −107 dBc/Hz
@ 10 kHz −114 dBc/Hz
@ 100 kHz −122 dBc/Hz
@ 1 MHz −146 dBc/Hz
@ 10 MHz −154 dBc/Hz
@ 30 MHz −154 dBc/Hz
SPREAD SPECTRUM
Modulation Range +0.1 −0.5 % Downspread, triangle modulation profile
Modulation Frequency 31.25 kHz Programmable
Peak Power Reduction 10 dB
First harmonic of 100 MHz output, triangle modulation
profile, spectrum analyzer resolution bandwidth = 20 kHz
1
x indicates either 2 or 3 for any given test condition.