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| 型号： | 843004AGI-01T |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 170 MHz, OTHER CLOCK GENERATOR, PDSO24 |
| 封装： | 4.40 X 7.80 MM, 0.925 MM HEIGHT, MO-153, TSSOP-24 |
| 文件页数： | 19/19页 |
| 文件大小： | 1414K |
| 代理商： | 843004AGI-01T |
ICS843004AGI-01 REVISION B MARCH 24, 2011
9
2011Integrated Device Technology, Inc.
ICS843004I-01 Data Sheet
FEMTOCLOCK CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER
Application Information
Power Supply Filtering Technique
As in any high speed analog circuitry, the power supply pins are
vulnerable to random noise. To achieve optimum jitter performance,
power supply isolation is required. The ICS843004I-01 provides
separate power supplies to isolate any high switching noise from the
outputs to the internal PLL. VCC, VCCA and VCCO should be
individually connected to the power supply plane through vias, and
0.01F bypass capacitors should be used for each pin. Figure 1
illustrates this for a generic VCC pin and also shows that VCCA
requires that an additional 10
resistor along with a 10F bypass
capacitor be connected to the VCCA pin.
Figure 1. Power Supply Filtering
Recommendations for Unused Input and Output Pins
Inputs:
Crystal Inputs
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 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.
LVCMOS Control Pins
All control pins have internal pulldowns; additional resistance is not
required but can be added for additional protection. A 1k
resistor
can be used.
Outputs:
LVPECL Outputs
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.
Crystal Input Interface
The ICS843004I-01 has been characterized with 18pF parallel
resonant crystals. The capacitor values shown in Figure 2 below
were determined using a 25MHz, 18pF parallel resonant crystal and
were chosen to minimize the ppm error.
Figure 2. Crystal Input Interface
VCC
VCCA
3.3V or 2.5V
10
10F
.01F
XTAL_IN
XTAL_OUT
X1
18pF Parallel Crystal
C1
33pF
C2
27pF
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 843004AGI-02LF | 制造商:Integrated Device Technology Inc 功能描述:Frequency Synthesizer 制造商:Integrated Device Technology Inc 功能描述:24 E-TSSOP (GREEN) - Bulk |
| 843004AGI-02LFT | 制造商:Integrated Device Technology Inc 功能描述:PLL Frequency Synthesizer Single 24-Pin TSSOP T/R 制造商:Integrated Device Technology Inc 功能描述:24 E-TSSOP (GREEN) - Tape and Reel |
| 843004AGI-04 | 制造商:Integrated Device Technology Inc 功能描述:843004AGI-04 - Rail/Tube |
| 843004AGI-04LF | 功能描述:时钟合成器/抖动清除器 RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
| 843004AGI-04LFT | 功能描述:时钟合成器/抖动清除器 RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
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