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参数资料
| 型号： | ICS8422004AGI |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 226.66 MHz, OTHER CLOCK GENERATOR, PDSO24 |
| 封装： | 4.40 X 7.80 MM, 0.92 MM HEIGHT, MO-153, TSSOP-24 |
| 文件页数： | 13/14页 |
| 文件大小： | 411K |
| 代理商： | ICS8422004AGI |
8422004AGI
www.icst.com/products/hiperclocks.html
REV. B NOVEMBER 14, 2005
8
Integrated
Circuit
Systems, Inc.
ICS8422004I
FEMTOCLOCKSLVCMOS/CRYSTAL-TO-
LVHSTL FREQUENCY SYNTHESIZER
PRELIMINARY
APPLICATION INFORMATION
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS8422004I 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.
POWER SUPPLY FILTERING TECHNIQUES
FIGURE 1. POWER SUPPLY FILTERING
10
Ω
V
DDA
10
μF
.01
μF
3.3V or 2.5V
.01
μF
V
DD
CRYSTAL INPUT INTERFACE
The ICS8422004I has been characterized with 18pF parallel
resonant crystals. The capacitor values shown in Figure 2
Figure 2. CRYSTAL INPUt INTERFACE
below were determined using a 26.5625MHz 18pF parallel
resonant crystal and were chosen to minimize the ppm error.
ICS8422004I
C1
22p
X1
18pF Parallel Crystal
C2
22p
XTAL_OUT
XTAL_IN
INPUTS:
CRYSTAL INPUT:
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 INPUT:
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.
RECOMMENDATIONS FOR UNUSED INPUT AND OUTPUT PINS
LVCMOS CONTROL PINS:
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.
OUTPUTS:
LVHSTL OUTPUT
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.
ICS8422004I
FEMTOCLOCKS LVCMOS/CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER
TSD
IDT / ICS FEMTOCLOCKS LVCMOS/CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER
ICS8422004I
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICS8422004AGI-01 | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
| ICS8422004AGI-01LF | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
| ICS8422004AGI-01LFT | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
| ICS8422004AGI-01T | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
| ICS8422004AGILF | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS⑩ LVCMOS/CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
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