參數(shù)資料
型號: ICS8421004AGI
英文描述: FEMTOCLOCKS⑩ CRYSTAL-TO-HSTL FREQUENCY SYNTHESIZER
中文描述: FEMTOCLOCKS⑩晶體對HSTL頻率合成器
文件頁數(shù): 8/13頁
文件大?。?/td> 194K
代理商: ICS8421004AGI
8421004AGI
www.icst.com/products/hiperclocks.html
REV. A MARCH 29, 2005
8
Integrated
Circuit
Systems, Inc.
ICS8421004I
F
EMTO
C
LOCKS
C
RYSTAL
-
TO
-
HSTL F
REQUENCY
S
YNTHESIZER
PRELIMINARY
A
PPLICATION
I
NFORMATION
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS8421004I 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 ICS8421004I 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.
ICS8421004I
C1
22p
X1
18pF Parallel Crystal
C2
22p
XTAL_OUT
XTAL_IN
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ICS8421004AGIT FEMTOCLOCKS⑩ CRYSTAL-TO-HSTL FREQUENCY SYNTHESIZER
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