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參數(shù)資料
| 型號： | ICS842023I |
| 英文描述： | FEMTOCLOCKS⑩ CRYSTAL-TO- HSTL CLOCK GENERATOR |
| 中文描述： | FEMTOCLOCKS⑩晶體對HSTL時鐘發(fā)生器 |
| 文件頁數(shù)： | 6/9頁 |
| 文件大小： | 153K |
| 代理商： | ICS842023I |
842023AGI
www.icst.com/products/hiperclocks.html
REV. B JUNE 14, 2005
6
Integrated
Circuit
Systems, Inc.
ICS842023I
F
EMTO
C
LOCKS
C
RYSTAL
-
TO
- HSTL
C
LOCK
G
ENERATOR
PRELIMINARY
A
PPLICATION
I
NFORMATION
Figure 2. C
RYSTAL
I
NPU
t I
NTERFACE
C
RYSTAL
I
NPUT
I
NTERFACE
The ICS842023I has been characterized with 18pF parallel
resonant crystals. The capacitor values, C1 and C2, shown in
Figure 2 below were determined using a 25MHz, 18pF parallel
resonant crystal and were chosen to minimize the ppm error.
The optimum C1 and C2 values can be slightly adjusted for dif-
ferent board layouts.
P
OWER
S
UPPLY
F
ILTERING
T
ECHNIQUES
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS842023I provides
separate power supplies to isolate any high switching
noise from the outputs to the internal PLL. 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 10
μ
F and a .01
μ
F bypass
capacitor should be connected to each V
DDA
pin.
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
ICS842023I
XTAL_IN
XTAL_OUT
X1
18pF Parallel Crystal
C2
22p
C1
22p
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| ICS842031AGI-01 | FEMTOCLOCKS⑩ CRYSTAL-TO- HSTL CLOCK GENERATOR |
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| ICS842031I-01 | FEMTOCLOCKS⑩ CRYSTAL-TO- HSTL CLOCK GENERATOR |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICS842031AGI-01 | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO- HSTL CLOCK GENERATOR |
| ICS842031AGI-01T | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO- HSTL CLOCK GENERATOR |
| ICS842031I-01 | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO- HSTL CLOCK GENERATOR |
| ICS8421002AGI | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS? CRYSTAL-TO-HSTL FREQUENCY SYNTHESIZER |
| ICS8421002AGI-01 | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS? CRYSTAL-TO-HSTL FREQUENCY SYNTHESIZER |
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