ICS844008I-15 Datasheet, PDF (4/12 Pages) Integrated Circuit Systems – FEMTOCLOCKS™ CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844008I-15
FEMTOCLOCKS™ CRYSTAL-TO-
LVDS FREQUENCY SYNTHESIZER
TABLE 5. CRYSTAL CHARACTERISTICS
Parameter
Test Conditions
Minimum Typical Maximum
Mode of Oscillation
Fundamental
Frequency
22.4
25
27.2
Parts per Million (ppm); NOTE 1
100
Equivalent Series Resistance (ESR)
50
Shunt Capacitance
7
Drive Level
100
NOTE: Characterized using an18pF parallel resonant crystal.
NOTE 1: When used with recommended 50ppm crystal and external trim caps adjusted for user PC board.
Units
MHz
ppm
Ω
pF
µW
TABLE 6. AC CHARACTERISTICS, V_DD = 3.3V±5%, TA = -40°C TO 85°C
Symbol Parameter
Test Conditions
Minimum Typical
FSEL = 0
125
f_OUT
Output Frequency
FSEL = 1
100
tsk(o) Output Skew; NOTE 1, 2
TBD
tjit(cc) Cycle-to-Cycle Jitter
25
tjit(Ø)
RMS Phase Jitter (Random);
NOTE 3
125MHz, (1.875MHz - 20MHz)
100MHz, (1.875MHz - 20MHz)
0.42
0.46
t_R / t_F
odc
Output Rise/Fall Time
Output Duty Cycle
20% to 80%
200
330
48
50
Minimum and Maximum values are design target specs.
NOTE 1: Defined as skew between outputs at the same supply voltages and with equal load conditions.
Measured at V_DD/2.
NOTE 2: This parameter is defined in accordance with JEDEC Standard 65.
NOTE 3: Please refer to the Phase Noise Plot.
Maximum
50
50
1
1
650
52
Units
MHz
MHz
ps
ps
ps
ps
ps
%
844008AYI-15
www.icst.com/products/hiperclocks.html
4
REV. A FEBRUARY 2, 2006