參數(shù)資料
型號: ICS83905AG
英文描述: LOW SKEW, 1:6 CRYSTAL INTERFACE-TOLVCMOS / LVTTL FANOUT BUFFER
中文描述: 低偏移,1:6晶體界面,TOLVCMOS / LVTTL扇出緩沖器
文件頁數(shù): 10/14頁
文件大?。?/td> 362K
代理商: ICS83905AG
83905AM
http://www.icst.com/products/hiperclocks.html
REV. A JANUARY 20, 2005
10
Integrated
Circuit
Systems, Inc.
ICS83905
L
OW
S
KEW
, 1:6 C
RYSTAL
I
NTERFACE
-
TO
-
LVCMOS / LVTTL F
ANOUT
B
UFFER
PRELIMINARY
A
PPLICATION
I
NFORMATION
C
RYSTAL
I
NPUT
I
NTERFACE
, F
UNDAMENTAL
Figure 1Ashows an example of ICS83905 crystal interface with
parallel resonance crystal using fundamental frequency. The C1,
C2 and R1 values are suggested for the best frequency accu-
R1
100
X1
XTAL_IN
XTAL_OUT
C2
16p
C1
10p
XTAL_IN
XTAL_OUT
C1
10p
L1
X1
C2
16p
C3
C
RYSTAL
I
NPUT
I
NTERFACE
, 3
RD
O
VERTONE
Figure 1Bshows an example of ICS83905 crystal interface with
parallel resonance crystal using 3
rd
overtone frequency. The C1,
C2 values are suggested for the best frequency accuracy ppm.
racy ppm. The optimum C1 and C2 values can be adjusted to
improve the frequency accuracy for stray capacitance of differ-
ent board layout.
F
IGURE
1A. C
RYSTAL
O
SCILLATOR
I
NTERFACE
, (F
UNDAMENTAL
)
The optimum C1 and C2 values can be adjusted to improve the
frequency accuracy for stray capacitance of different board lay-
out. The C3 and L1 can be calculated from the given equation.
F
IGURE
1B. C
RYSTAL
O
SCILLATOR
I
NTERFACE
(3
RD
O
VERTONE
)
3
*
1
2
1
_
C
L
fund
F
π
=
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