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参数资料
| 型号： | ICS8427BK-02T |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 700 MHz, OTHER CLOCK GENERATOR, QCC32 |
| 封装： | 5 X 5 MM, 0.75 MM HEIGHT, MO-220, VFQFN-32 |
| 文件页数： | 3/19页 |
| 文件大小： | 280K |
| 代理商： | ICS8427BK-02T |
8427BY-02
www.icst.com/products/hiperclocks.html
REV. A MARCH 4, 2005
11
PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS8427-02
700MHZ, LOW JITTER
LVCMOS/CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER
APPLICATION INFORMATION
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS8427-02 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 3 illustrates how
a 10
Ω resistor along with a 10μF and a .01μF bypass
capacitor should be connected to each V
DDA pin.
POWER SUPPLY FILTERING TECHNIQUES
FIGURE 3. POWER SUPPLY FILTERING
10
Ω
V
DDA
10
μF
.01
μF
2.5V
.01
μF
V
DD
CRYSTAL INPUT INTERFACE
The ICS8427-02 has been characterized with 18pF parallel
resonant crystals. The capacitor values, C1 and C2, shown in
Figure 4 below were determined using a 16.66MHz, 18pF paral-
Figure 4. CRYSTAL INPUt INTERFACE
lel resonant crystal and were chosen to minimize the ppm error.
The optimum C1 and C2 values can be slightly adjusted for
different board layouts.
C1
22p
X1
18pF Parallel Crystal
C2
22p
XTAL_OUT
XTAL_IN
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICS8427DK-02 | 制造商:ICS 制造商全称:ICS 功能描述:500MHZ, LOW JITTER LVCMOS/CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
| ICS8427DK-02LF | 制造商:ICS 制造商全称:ICS 功能描述:500MHZ, LOW JITTER LVCMOS/CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
| ICS8427DK-02LFT | 制造商:ICS 制造商全称:ICS 功能描述:500MHZ, LOW JITTER LVCMOS/CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
| ICS8427DK-02T | 制造商:ICS 制造商全称:ICS 功能描述:500MHZ, LOW JITTER LVCMOS/CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
| ICS8427DY-02 | 制造商:ICS 制造商全称:ICS 功能描述:500MHZ, LOW JITTER LVCMOS/CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
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