參數(shù)資料
型號(hào)： ICS843004I-04
英文描述： FEMTOCLOCKS-TM CRYSTAL/LVCMOS-TO- 3.3V LVPECL FREQUENCY SYNTHESIZER
中文描述： FEMTOCLOCKS -商標(biāo)CRYSTAL/LVCMOS-TO- 3.3 LVPECL的頻率合成器
文件頁(yè)數(shù)： 7/14頁(yè)
文件大小： 186K
代理商： ICS843004I-04
843004AGI-04
www.icst.com/products/hiperclocks.html
REV. A FEBRUARY 15, 2006
7
Integrated
Circuit
Systems, Inc.
ICS843004I-04
F
EMTO
C
LOCKS
C
RYSTAL
/LVCMOS-
TO
-
3.3V LVPECL F
REQUENCY
S
YNTHESIZER
LVCMOS
TO
XTAL I
NTERFACE
The XTAL_IN input can accept a single-ended LVCMOS
signal through an AC couple capacitor. A general interface
diagram is shown in
Figure 3.
The XTAL_OUT pin can
be left floating. The input edge rate can be as slow as
10ns. For LVCMOS inputs, it is recommended that the
amplitude be reduced from full swing to half swing in order
to prevent signal interference with the power rail and to
reduce noise. This configuration requires that the output
F
IGURE
3. G
ENERAL
D
IAGRAM
FOR
LVCMOS D
RIVER
TO
XTAL I
NPUT
I
NTERFACE
impedance of the driver (Ro) plus the series resistance
(Rs) equals the transmission line impedance. In addition,
matched termination at the crystal input will attenuate the
signal in half. This can be done in one of two ways. First,
R1 and R2 in parallel should equal the transmission line
impedance. For most 50
Ω
applications, R1 and R2 can be
100
Ω
. This can also be accomplished by removing R1 and
making R2 50
Ω
.
R2
Zo = 50
VDD
Ro
Zo = Ro + Rs
R1
VDD
XTAL_IN
XTAL_OUT
.1uf
Rs
I
NPUTS
:
C
RYSTAL
I
NPUT
:
For applications not requiring the use of the crystal oscillator
input, both XTAL_IN and XTAL_OUT can be left floating.
Though not required, but for additional protection, a 1k
Ω
resistor can be tied from XTAL_IN to ground.
CLK I
NPUT
:
For applications not requiring the use of a clock input, it can
be left floating. Though not required, but for additional
protection, a 1k
Ω
resistor can be tied from the CLK input to
ground.
LVCMOS C
ONTROL
P
INS
:
All control pins have internal pull-ups or pull-downs; additional
resistance is not required but can be added for additional
protection. A 1k
Ω
resistor can be used.
R
ECOMMENDATIONS
FOR
U
NUSED
I
NPUT
AND
O
UTPUT
P
INS
O
UTPUTS
:
LVPECL O
UTPUT
All unused LVPECL outputs can be left floating. We
recommend that there is no trace attached. Both sides of the
differential output pair should either be left floating or
terminated.
相關(guān)PDF資料
PDF描述
ICS843004AGI FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER
ICS843004AGILF FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER
ICS843004AGILFT FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER
ICS843004AGIT FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER
ICS843004I FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER
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參數(shù)描述
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