FEMTOCLOCK™ CRYSTAL/LVCMOS-TO-3.3V, 2.5V LVPECL
FREQUENCY SYNTHESIZER
7 Rev B 11/16/15
843001I-22 DATA SHEET
Table 5. Crystal Characteristics
NOTE: Characterized using an 18pF parallel resonant crystal.
Table 6. Input Frequency Characteristics, V
CC
= V
CCO_LVCMOS
= V
CCO_LVPECL
3.3V ± 10%, V
EE
= 0V,T
A
= -40°C to 85°C
AC Electrical Characteristics
Table 7A. AC Characteristics, V
CC
= V
CCO_LVCMOS
= V
CCO_LVPECL
= 3.3V ± 10%, V
EE
= 0V, T
A
= -40°C to 85°C
NOTE: Electrical parameters are guaranteed over the specified ambient operating temperature range, which is established when the device is
mounted in a test socket with maintained transverse airflow greater than 500 lfpm. The device will meet specifications after thermal equilibrium
has been reached under these conditions.
NOTE 1: Phase jitter measured using a crystal interface.
Parameter Test Conditions Minimum Typical Maximum Units
Mode of Oscillation Fundamental
Frequency 14 35.55 MHz
Equivalent Series Resistance (ESR) 50
Shunt Capacitance 7pF
Drive Level 1mW
Symbol Parameter Test Conditions Minimum Typical Maximum Units
f
IN
Input Frequency
CLK SEL1 = 1, SEL0 = 0 14 35.55 MHz
CLK SEL1 = 1, SEL0 = 0 DC 250 MHz
Symbol Parameter Test Conditions Minimum Typical Maximum Units
f
OUT
Output Frequency 49 640 MHz
tjit(Ø)
RMS Phase Jitter, (Random);
NOTE 1
125MHz,
(1.875MHz – 20MHz)
0.50 ps
f
VCO
PLL VCO Lock Range 490 640 MHz
t
R
/ t
F
Output
Rise/Fall Time
Q/nQ 20% to 80% 200 500 ps
REF_OUT 20% to 80% 200 700 ps
odc Output Duty Cycle
Q/nQ 45 55 %
REF_OUT ƒ 250MHz 44 56 %
