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参数资料
| 型号： | ICS8422002AGIT |
| 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, PDSO20 |
| 封装： | 6.50 X 4.40 MM, 0.92 MM HEIGHT, MO-153, TSSOP-20 |
| 文件页数： | 12/13页 |
| 文件大小： | 315K |
| 代理商： | ICS8422002AGIT |
8422002AGI
8
REV. B JANUARY 11, 2008
ICS8422002I
FEMTOCLOCKS CRYSTAL-TO-
LVHSTL FREQUENCY SYNTHESIZER
PRELIMINARY
CRYSTAL INPUT INTERFACE
The ICS8422002I has been characterized with 18pF paral-
lel resonant crystals. The capacitor values shown in
Figure
Figure 2. CRYSTAL INPUt INTERFACE
2 below were determined using a 26.5625MHz 18pF paral-
lel resonant crystal and were chosen to minimize the ppm
error.
ICS8422002I
APPLICATION INFORMATION
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS8422002I provides
separate power supplies to isolate any high switching
noise from the outputs to the internal PLL. V
DD, VDDA, and
V
DDO 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
resistor along with a 10F and a .01F bypass
capacitor should be connected to each V
DDA.
POWER SUPPLY FILTERING TECHNIQUES
FIGURE 1. POWER SUPPLY FILTERING
10
V
DDA
10
F
.01
F
3.3V or 2.5V
.01
F
V
DD
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
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
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
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.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICS8422002I | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
| ICS8422002I-01 | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
| ICS8422004-01I | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
| ICS8422004AGI | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS? LVCMOS/CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
| ICS8422004AGI-01 | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
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