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參數(shù)資料
| 型號(hào)： | 0002A01L |
| 英文描述： | FEMTOCLOCKS⑩ CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER |
| 中文描述： | FEMTOCLOCKS⑩晶體到的LVCMOS / LVTTL頻率合成器 |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大?。?/td> | 199K |
| 代理商： | 0002A01L |
Integrated
Circuit
Systems, Inc.
840002AG-01
www.icst.com/products/hiperclocks.html
REV. B JANUARY 13, 2006
7
ICS840002-01
FEMTOCLOCKSCRYSTAL-TO-
LVCMOS/LVTTL FREQUENCY SYNTHESIZER
APPLICATION INFORMATION
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS840002-01 provides
separate power supplies to isolate any high switching
noise from the outputs to the internal PLL. V
DD, VDDA, and VDDO
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 10F and a .01μF bypass
capacitor should be connected to each V
DDA. The 10Ω re-
sistor can also be replaced by a ferrite bead.
POWER SUPPLY FILTERING TECHNIQUES
FIGURE 1. POWER SUPPLY FILTERING
10
Ω
V
DDA
10
μF
.01
μF
3.3V
.01
μF
V
DD
CRYSTAL INPUT INTERFACE
The ICS840002-01 has been characterized with 18pF paral-
lel resonant crystals. The capacitor values shown in Figure 2
Figure 2. CRYSTAL INPUt INTERFACE
below were determined using a 25MHz 18pF parallel reso-
nant crystal and were chosen to minimize the ppm error.
ICS84332
XTAL_IN
XTAL_OUT
X1
18pF Parallel Cry stal
C2
22p
C1
22p
ICS840002-01
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