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| 型号： | 844256BGT |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | XO, clock |
| 英文描述： | 622.08 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： | 17/17页 |
| 文件大小： | 390K |
| 代理商： | 844256BGT |
IDT / ICS LVDS FREQUENCY SYNTHESIZER W/FANOUT BUFFER
9
ICS844256BG REV. A NOVEMBER 7, 2008
ICS844256
FEMTOCLOCKS CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
FIGURE 1. POWER SUPPLY FILTERING
10
Ω
V
DDA
10
μF
.01
μF
3.3V
.01
μF
V
DD
APPLICATION INFORMATION
CRYSTAL INPUT INTERFACE
The ICS844256 has been characterized with 18pF parallel
resonant crystals. The capacitor values shown in
Figure 2
FIGURE 2. CRYSTAL INPUt INTERFACE
below were deter mined using an 18pF parallel resonant
crystal and were chosen to minimize the ppm error.
C1
18p
X1
18pF Parallel Crystal
C2
22p
XTAL_IN
XTAL_OUT
INPUTS:
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.
RECOMMENDATIONS FOR UNUSED INPUT AND OUTPUT PINS
OUTPUTS:
LVDS Outputs
All unused LVDS output pairs can be either left floating or
terminated with 100
Ω across. If they are left floating, we
recommend that there is no trace attached.
POWER SUPPLY FILTERING TECHNIQUES
As in any high speed analog circuitry, the power supply pins are
vulnerable to random noise. To achieve optimum jitter perfor-
mance, power supply isolation is required. The ICS844256 pro-
vides 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 0.01F bypass capacitors should be used for each pin.
Fig-
ure 1 illustrates this for a generic V
CC pin and also shows that
V
DDA requires that an additional10Ω resistor along with a 10F
bypass capacitor be connected to the V
DDA pin.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 844256CK-24LF | 制造商:Integrated Device Technology Inc 功能描述:LVDS 0.385V 32PIN VFQFN - Rail/Tube |
| 844256CK-24LFT | 制造商:Integrated Device Technology Inc 功能描述:PLL Frequency Synthesizer Single 32-Pin VFQFPN EP T/R 制造商:Integrated Device Technology Inc 功能描述:32 VFQFN (LEAD-FREE) - Tape and Reel |
| 844256DGILF | 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 |
| 844256DGILFT | 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 |
| 844256DGLF | 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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