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參數(shù)資料
| 型號： | 840002AL |
| 英文描述： | FEMTOCLOCKS⑩ CRYSTAL-TO LVCMOS/ |
| 中文描述： | FEMTOCLOCKS⑩晶體到的LVCMOS / |
| 文件頁數(shù)： | 9/13頁 |
| 文件大?。?/td> | 204K |
| 代理商： | 840002AL |
Integrated
Circuit
Systems, Inc.
840002AGI
www.icst.com/products/hiperclocks.html
REV. A MARCH 10, 2005
9
ICS840002I
F
EMTO
C
LOCKS
C
RYSTAL
-
TO
-
LVCMOS/LVTTL F
REQUENCY
S
YNTHESIZER
A
PPLICATION
I
NFORMATION
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS840002I provides
separate power supplies to isolate any high switching
noise from the outputs to the internal PLL. V
, V
, and V
should be individually connected to the power supply
plane through vias, and bypass capacitors should be
used for each pin. To achieve optimum jitter performance,
power supply isolation is required. Figure 1 illustrates how
a 10
Ω
resistor along with a 10μF and a .01
μ
F bypass
capacitor should be connected to each V
DDA
.
P
OWER
S
UPPLY
F
ILTERING
T
ECHNIQUES
F
IGURE
1. P
OWER
S
UPPLY
F
ILTERING
10
Ω
V
DDA
10
μ
F
.01
μ
F
3.3V or 2.5V
.01
μ
F
V
DD
C
RYSTAL
I
NPUT
I
NTERFACE
The ICS840002I has been characterized with 18pF parallel
resonant crystals. The capacitor values shown in Figure 2
Figure 2. C
RYSTAL
I
NPU
t I
NTERFACE
below were determined using a 26.5625MHz 18pF parallel
resonant crystal and were chosen to minimize the ppm error.
ICS840002I
C1
22p
X1
18pF Parallel Crystal
C2
22p
XTAL_OUT
XTAL_IN
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