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參數(shù)資料
| 型號： | ICS8422004-01I |
| 英文描述： | FEMTOCLOCKS⑩ CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
| 中文描述： | FEMTOCLOCKS⑩晶體對LVHSTL頻率合成器 |
| 文件頁數(shù)： | 8/13頁 |
| 文件大小： | 195K |
| 代理商： | ICS8422004-01I |
8422004AGI-01
www.icst.com/products/hiperclocks.html
REV. B NOVEMBER 14, 2005
8
Integrated
Circuit
Systems, Inc.
ICS8422004I-01
F
EMTO
C
LOCKS
C
RYSTAL
-
TO
-
LVHSTL F
REQUENCY
S
YNTHESIZER
PRELIMINARY
C
RYSTAL
I
NPUT
I
NTERFACE
The ICS8422004I-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.
ICS8422004I-01
A
PPLICATION
I
NFORMATION
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS8422004I-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
I
NPUTS
:
C
RYSTAL
I
NPUT
:
For applications not requiring the use of the crystal oscillator
input, both XTAL_IN and XTAL_OUT can be left floating.
Though not required, but for additional protection, a 1k
Ω
resistor can be tied from XTAL_IN to ground.
TEST_CLK I
NPUT
:
For applications not requiring the use of the test clock, it can
be left floating. Though not required, but for additional
protection, a 1k
Ω
resistor can be tied from the TEST_CLK to
ground.
R
ECOMMENDATIONS
FOR
U
NUSED
I
NPUT
AND
O
UTPUT
P
INS
LVCMOS C
ONTROL
P
INS
:
All control pins have internal pull-ups or pull-downs;
additional resistance is not required but can be added for
additional protection. A 1k
Ω
resistor can be used.
O
UTPUTS
:
LVHSTL O
UTPUT
All unused LVHSTL outputs can be left floating. We
recommend that there is no trace attached. Both sides of the
differential output pair should either be left floating or
terminated.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICS8422004AGI | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS? LVCMOS/CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
| ICS8422004AGI-01 | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
| ICS8422004AGI-01LF | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
| ICS8422004AGI-01LFT | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
| ICS8422004AGI-01T | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
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