Datasheet

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AD9525 Data Sheet

Rev. A | Page 8 of 48

CLOCK OUTPUT ABSOLUTE TIME JITTER (CLOCK GENERATION USING EXTERNAL 122.88 MHZ VCXO)

Table 11.

Parameter Min Typ Max Unit Test Conditions/Comments

LVPECL OUTPUT ABSOLUTE TIME JITTER

Application example based on a typical setup using

an external 122.88 MHz VCXO (Crystek CVHD-950);

reference = 122.88 MHz; R divider = 1; LBW = 40 Hz

FOUT = 122.88 MHz 107 fs rms Integration BW = 1 kHz to 40 MHz

69 fs rms Integration BW = 12 kHz to 20 MHz

FOUT = 61.44 MHz 108 fs rms Integration BW = 1 kHz to 20 MHz

107

fs rms

Integration BW = 12 kHz to 20 MHz

CLOCK OUTPUT ABSOLUTE TIME JITTER (CLOCK GENERATION USING EXTERNAL 1475 MHZ VCO)

Table 12.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

LVPECL OUTPUT ABSOLUTE TIME JITTER

Application example based on a typical setup using

an external 1475 MHz VCO (Bowei Model MVCO-1475);

reference = 122.88 MHz; R divider = 1; PLL LBW = 18 kHz

FOUT = 1474.56 MHz 99 fs rms Integration BW = 1 kHz to 100 MHz

77 fs rms Integration BW = 10 kHz to 100 MHz

74 fs rms Integration BW = 10 kHz to 40 MHz

68 fs rms Integration BW = 12 kHz to 20 MHz

Reference Sideband Spurs

−93

dBc

±122.88 MHz

FOUT = 245.76 MHz 104 fs rms Integration BW = 1 kHz to 100 MHz

87 fs rms Integration BW = 10 kHz to 100 MHz

75 fs rms Integration BW = 12 kHz to 20 MHz

Reference Sideband Spurs −98 dBc ±122.88 MHz

Table 13.

Parameter Min Typ Max Unit Test Conditions/Comments

LVPECL OUTPUT ABSOLUTE TIME JITTER

Application example based on a typical setup using

an external 1475 MHz VCO (Z-Communications CRO1474-LF);

reference = 122.88 MHz; R divider = 1; PLL LBW = 8 kHz

FOUT = 1474.56 MHz 72 fs rms Integration BW = 1 kHz to 100 MHz

40 fs rms Integration BW = 10 kHz to 100 MHz

33 fs rms Integration BW = 10 kHz to 40 MHz

fs rms

Integration BW = 12 kHz to 20 MHz

Reference Sideband Spurs −94 dBc ±122.88 MHz

FOUT = 245.76 MHz 83 fs rms Integration BW = 1 kHz to 100 MHz

61 fs rms Integration BW = 10 kHz to 40 MHz

46 fs rms Integration BW = 12 kHz to 20 MHz

Reference Sideband Spurs −93 dBc ±122.88 MHz