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| 型号： | AD9887AKSZ-140 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 46/52页 |
| 文件大小： | 0K |
| 描述： | IC INTRFACE ANALOG/DVI 160-MQFP |
| 标准包装： | 24 |
| 应用： | 图形卡，VGA 接口 |
| 接口： | 模拟和数字 |
| 电源电压： | 3.15 V ~ 3.45 V |
| 封装/外壳： | 160-BQFP |
| 供应商设备封装： | 160-MQFP（28x28） |
| 包装： | 托盘 |
| 安装类型： | 表面贴装 |
| 产品目录页面： | 788 (CN2011-ZH PDF) |
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AD9887A
Rev. B | Page 50 of 52
PLL
Place the PLL loop filter components as close as possible to the
FILT pin. Do not place any digital or other high frequency
traces near these components. Use the values suggested in the
Specifications section with 10% tolerances or less.
OUTPUTS—BOTH DATA AND CLOCKS
Try to minimize the trace length that the digital outputs must
drive. Longer traces have higher capacitance, requiring more
current and causing more internal digital noise. Shorter traces
reduce the possibility of reflections.
Adding a series resistor with a value of 22 Ω to 100 Ω can suppress
reflections, reduce EMI, and reduce the current spikes inside of
the AD9887A. However, if 50 Ω traces are used on the PCB, the
data outputs should not need these resistors. A 22 Ω resistor on
the DATACK output should provide good impedance matching
that further reduces reflections. If EMI or current spiking is a
concern, it is recommended to use a lower drive strength setting.
If series resistors are used, place them as close as possible to the
AD9887A pins, but try not to add vias or extra length to the
output trace.
If possible, limit the capacitance that each of the digital outputs
drives to less than 10 pF. This can be accomplished easily by
keeping traces short and connecting the outputs to only one
device. Loading the outputs with excessive capacitance increases
the current transients inside the AD9887A, creating digital
noise on the power supplies.
DIGITAL INPUTS
The digital inputs on the AD9887A are designed to work with
3.3 V signals.
Any noise in the HSYNC input trace produces jitter in the
system. Therefore, minimize the trace length and do not run
any digital or other high frequency traces near it.
VOLTAGE REFERENCE
The voltage reference should be bypassed with a 0.1 μF
capacitor. Place it as close as possible to the AD9887A pin.
Make the ground connection as short as possible.
REFOUT is easily connected to REFIN with a short trace.
Avoid making this trace longer than necessary.
When using an external reference, the REFOUT output,
although unused, still needs to be bypassed with a 0.1 μF
capacitor to avoid ringing.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD9887AKSZ-1401 | 制造商:AD 制造商全称:Analog Devices 功能描述:Dual Interface for Flat Panel Display |
| AD9887AKSZ-170 | 功能描述:IC INTRFACE ANALOG/DVI 160-MQFP RoHS:是 类别:集成电路 (IC) >> 接口 - 专用 系列:- 特色产品:NXP - I2C Interface 标准包装:1 系列:- 应用:2 通道 I²C 多路复用器 接口:I²C，SM 总线 电源电压:2.3 V ~ 5.5 V 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:剪切带 (CT) 安装类型:表面贴装 产品目录页面:825 (CN2011-ZH PDF) 其它名称:568-1854-1 |
| AD9887AKSZ-170 | 制造商:Analog Devices 功能描述:IC DUAL DISPLAY INTERFACE |
| AD9887AKSZ-1701 | 制造商:AD 制造商全称:Analog Devices 功能描述:Dual Interface for Flat Panel Display |
| AD9887APCB | 制造商:AD 制造商全称:Analog Devices 功能描述:Dual Interface for Flat Panel Displays |
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