參數(shù)資料
型號: ICS843204AGIT
英文描述: FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
中文描述: FEMTOCLOCKS⑩晶體至3.3的LVPECL頻率合成器
文件頁數(shù): 6/12頁
文件大小: 111K
代理商: ICS843204AGIT
843204AGI
www.icst.com/products/hiperclocks.html
REV. A JANUARY 6, 2006
6
Integrated
Circuit
Systems, Inc.
ICS843204I
F
EMTO
C
LOCKS
C
RYSTAL
-
TO
-
3.3V LVPECL F
REQUENCY
S
YNTHESIZER
PRELIMINARY
C
RYSTAL
I
NPUT
I
NTERFACE
The ICS843204I has been characterized with 18pF
parallel resonant crystals. The capacitor values shown in
Figure 2. C
RYSTAL
I
NPU
t I
NTERFACE
Figure 2
below were determined using an 18pF parallel
resonant crystal and were chosen to minimize the ppm error.
ICS843204I
C1
33p
X1
18pF Parallel Crystal
C2
27p
XTAL_OUT
XTAL_IN
A
PPLICATION
I
NFORMATION
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS843204I 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 sup-
ply 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
CCA
.
P
OWER
S
UPPLY
F
ILTERING
T
ECHNIQUES
F
IGURE
1. P
OWER
S
UPPLY
F
ILTERING
10
Ω
V
CCA
10
μ
F
.01
μ
F
3.3V
.01
μ
F
V
CC
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