參數(shù)資料
型號: ICS8430I-71B
英文描述: 700MHZ, LOW JITTER, CRYSTAL INTERFACE / LVCMOS-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
中文描述: 700MHz的,低抖動,晶體界面/的LVCMOS至3.3的LVPECL頻率合成器
文件頁數(shù): 8/16頁
文件大?。?/td> 168K
代理商: ICS8430I-71B
8430BYI-71
www.icst.com/products/hiperclocks.html
REV. A FEBRUARY 17, 2006
8
Integrated
Circuit
Systems, Inc.
ICS8430BI-71
700MH
Z
, L
OW
J
ITTER
, C
RYSTAL
I
NTERFACE
/
LVCMOS-
TO
-3.3V LVPECL F
REQUENCY
S
YNTHESIZER
PRELIMINARY
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS8430BI-71 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 2
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
CCA
pin.
P
OWER
S
UPPLY
F
ILTERING
T
ECHNIQUES
F
IGURE
2. P
OWER
S
UPPLY
F
ILTERING
10
Ω
V
CCA
10
μ
F
.01
μ
F
3.3V
.01
μ
F
V
CC
A
PPLICATION
I
NFORMATION
Figure 3. C
RYSTAL
I
NPU
t I
NTERFACE
C
RYSTAL
I
NPUT
I
NTERFACE
A crystal can be characterized for either series or parallel mode
operation. The ICS8430BI-71 has a built-in crystal oscillator circuit.
This interface can accept either a series or parallel crystal without
additional components and generate frequencies with accuracy
suitable for most applications. Additional accuracy can be
achieved by adding two small capacitors C1 and C2 as shown in
Figure 3
.
C1
18p
X1
18pF Parallel Crystal
C2
22p
XTAL_OUT
XTAL_IN
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