參數(shù)資料
型號: ICS8402AYIT
英文描述: 350MHZ, CRYSTAL-TO-LVCMOS / LVTTL FREQUENCY SYNTHESIZER
中文描述: 350MHz頻段,水晶到的LVCMOS / LVTTL頻率合成器
文件頁數(shù): 10/13頁
文件大小: 174K
代理商: ICS8402AYIT
8402AYI
www.icst.com/products/hiperclocks.html
REV. A DECEMBER 23, 2004
10
Integrated
Circuit
Systems, Inc.
ICS8402I
350MH
Z
, C
RYSTAL
-
TO
-LVCMOS / LVTTL
F
REQUENCY
S
YNTHESIZER
Figure 3. C
RYSTAL
I
NPU
t I
NTERFACE
A
PPLICATION
I
NFORMATION
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS8402I provides sepa-
rate 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 2 illustrates how
a 10
resistor along with a 10
μ
F and a .01
μ
F bypass
capacitor should be connected to each V
DDA
pin.
F
IGURE
2. P
OWER
S
UPPLY
F
ILTERING
10
V
DDA
10
μ
F
.01
μ
F
3.3V
.01
μ
F
V
DD
P
OWER
S
UPPLY
F
ILTERING
T
ECHNIQUES
ICS84332
XTAL_IN
XTAL_OUT
X1
18pF Parallel Crystal
C2
22p
C1
22p
C
RYSTAL
I
NPUT
I
NTERFACE
The ICS8402I has been characterized with 18pF parallel
resonant crystals. The capacitor values, C1 and C2,
shown in Figure 3 below were determined using a 25MHz,
18pF parallel resonant crystal and were chosen to mini-
mize the ppm error. The optimum C1 and C2 values can
be slightly adjusted for different board layouts.
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