參數(shù)資料
型號(hào): ICS8427DY-02LFT
英文描述: 500MHZ, LOW JITTER LVCMOS/CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER
中文描述: 500MHz的低抖動(dòng)的LVCMOS /水晶到LVHSTL頻率合成器
文件頁(yè)數(shù): 12/21頁(yè)
文件大?。?/td> 258K
代理商: ICS8427DY-02LFT
8427DY-02
www.icst.com/products/hiperclocks.html
REV. A FEBRUARY 17, 2006
12
Integrated
Circuit
Systems, Inc.
ICS8427-02
500MH
Z
, L
OW
J
ITTER
LVCMOS/C
RYSTAL
-
TO
-LVHSTL F
REQUENCY
S
YNTHESIZER
A
PPLICATION
I
NFORMATION
C
RYSTAL
I
NPUT
I
NTERFACE
The ICS8427-02 has been characterized with 18pF parallel
resonant crystals. The capacitor values, C1 and C2, shown in
Figure 3
below were determined using a 16.66MHz, 18pF
Figure 3. C
RYSTAL
I
NPU
t I
NTERFACE
parallel resonant crystal and were chosen to minimize the
ppm error. The optimum C1 and C2 values can be slightly
adjusted for different board layouts.
C1
22p
X1
18pF Parallel Crystal
C2
22p
XTAL_OUT
XTAL_IN
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.
TEST_CLK I
NPUT
:
For applications not requiring the use of the test clock, it can
be left floating. Though not required, but for additional
protection, a 1k
Ω
resistor can be tied from the TEST_CLK 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
:
LVHSTL O
UTPUT
All unused LVHSTL 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.
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