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參數資料
| 型號： | ICS8421002I-01 |
| 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： | 8/13頁 |
| 文件大?。?/td> | 200K |
| 代理商： | ICS8421002I-01 |
8421002AGI-01
www.icst.com/products/hiperclocks.html
REV. A FEBRUARY 6, 2006
8
Integrated
Circuit
Systems, Inc.
ICS8421002I-01
F
EMTO
C
LOCKS
C
RYSTAL
-
TO
-
HSTL F
REQUENCY
S
YNTHESIZER
C
RYSTAL
I
NPUT
I
NTERFACE
The ICS8421002I-01 has been characterized with 18pF par-
allel resonant crystals. The capacitor values shown in
Figure
Figure 2. C
RYSTAL
I
NPU
t I
NTERFACE
2
below were determined using a 25MHz 18pF parallel reso-
nant crystal and were chosen to minimize the ppm error.
ICS8421002I-01
A
PPLICATION
I
NFORMATION
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS8421002I-01 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
C1
22p
X1
18pF Parallel Crystal
C2
22p
XTAL_OUT
XTAL_IN
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