PL607041 Datasheet, PDF (5/11 Pages) Micrel Semiconductor – ClockWorks® PCIe Quad Outputs Ultra-Low Jitter, HCSL Frequency Synthesizer

Micrel, Inc.
Crystal Characteristics
Parameter
Mode of Oscillation
Frequency
Equivalent Series Resistance
(ESR)
Shunt Capacitor, C0
Correlation Drive Level
Condition
15pF load capacitance
PL607041
Min.
Typ.
Max.
Fundamental, Parallel Resonant
25
50
1
7
10
100
Units
MHz
Ω
pF
µW
AC Electrical Characteristics^{(6, 7)}
VDD = VDDO1/2 = 3.3V ±5% or 2.5V ±5%
VDD = 3.3V ±5%, VDDO1/2 = 3.3V ±5% or 2.5V ±5%
TA = –40°C to +85°C. RL = 50Ω to VSS
Symbol Parameter
Condition
Min. Typ. Max. Units
FOUT
Output Frequency
25
100
125
MHz
200
FREF
FIN
Crystal Input Frequency
Reference Input Frequency
25
MHz
25
MHz
FIN
TR/TF
ODC
FIN Signal Amplitude
HCSL Output Rise/Fall Time
Output Duty Cycle
Internally AC-coupled
20% - 80%
0.9
VDD
VPP
150 300
450
ps
48
50
52
%
TSKEW
TLOCK
Tjit(Ø)
Output-to-Output Skew
PLL Lock Time
RMS Phase Jitter⁽⁸⁾
Cycle-to-Cycle Jitter
Note 7
100MHz
Integration Range (1.5MHz – 10MHz)
45
ps
20
ms
320
fs
30
ps,
peak
Notes:
6. All phase noise measurements were taken with an Agilent 5052B phase noise system.
7. Defined as skew between outputs at the same supply voltage and with equal load conditions; measured at the output differential crossing points.
8. Measured using 25MHz crystal as the input reference source. If using an external reference input, use a low phase noise source. With an external
reference, the phase noise will follow the input source phase noise up to about 1MHz.
Spread Spectrum Characteristics
Parameter
Modulation Rate⁽⁹⁾
Condition
Min.
Typ.
31.6
Max.
Units
kHz
Modulation Magnitude⁽¹⁰⁾
Setting is -0.25%
Setting is -0.50%
-0.073 to -0.265 0 to -0.250 +0.031 to -0.375
%
-0.136 to -0.383 0 to -0.500 +0.078 to -0.589
%
Notes:
9. The modulation rate is created from the crystal frequency, divided by 792.
10. The typical modulation makes the output frequency sweep between the target frequency (0%) and the down-spread value (-0.25% or -0.5%). There
is process variation on the modulation magnitude and the smallest and largest possible modulation magnitude sweep ranges are listed in the table.
April 1, 2014
5
Revision 1.2
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