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參數(shù)資料
| 型號： | ICS843246I |
| 廠商： | Integrated Device Technology, Inc. |
| 英文描述： | FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER |
| 中文描述： | FEMTOCLOCKS⑩晶體至3.3的LVPECL頻率合成瓦/扇出緩沖器集成 |
| 文件頁數(shù)： | 8/17頁 |
| 文件大?。?/td> | 345K |
| 代理商： | ICS843246I |
IDT
/ ICS
3.3V LVPECL FREQUENCY SYNTHESIZER
8
ICS843246BGI REV. A AUGUST 2, 2007
ICS843246I
FEMTOCLOCKS CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/FANOUT BUFFER
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS843246I provides
separate power supplies to isolate any high switching
noise from the outputs to the internal PLL. V
CC
, V
CCA
and
V
CCO
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 iso-
lation is required.
Figure 1
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
1. 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
C
RYSTAL
I
NPUT
I
NTERFACE
The ICS843246I has been characterized with 18pF parallel
resonant crystals. The capacitor values shown in
Figure 2
F
IGURE
2. C
RYSTAL
I
NPU
t I
NTERFACE
below were determined using an 18pF parallel resonant
crystal and were chosen to minimize the ppm error.
C1
22p
X1
18pF Parallel Crystal
C2
22p
XTAL_OUT
XTAL_IN
I
NPUTS
:
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.
R
ECOMMENDATIONS
FOR
U
NUSED
I
NPUT
AND
O
UTPUT
P
INS
O
UTPUTS
:
LVPECL O
UTPUTS
All unused LVPECL 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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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ICS84324EM | 制造商:ICS 制造商全稱:ICS 功能描述:CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER WITH FANOUT BUFFER |
| ICS84324EMT | 制造商:ICS 制造商全稱:ICS 功能描述:CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER WITH FANOUT BUFFER |
| ICS84325 | 制造商:ICS 制造商全稱:ICS 功能描述:CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER WITH FANOUT BUFFER |
| ICS8432-51 | 制造商:ICS 制造商全稱:ICS 功能描述:700MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER |
| ICS843251-04 | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR |
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