- 您现在的位置：买卖IC网 > PDF目录378403 > AN-5058 (Fairchild Semiconductor Corporation) Family Frequently Asked Questions (FAQs) PDF资料下载
参数资料
| 型号： | AN-5058 |
| 厂商： | Fairchild Semiconductor Corporation |
| 英文描述： | Family Frequently Asked Questions (FAQs) |
| 中文描述： | 家庭常见问题（FAQs） |
| 文件页数： | 3/5页 |
| 文件大小： | 103K |
| 代理商： | AN-5058 |
AN-5058
APPLICATION NOTE
2005 Fairchild Semiconductor Corporation
Rev. 1.0.1 3/22/07
www.fairchildsemi.com
3
Implementation
What distance can a μSerDes drive
The distance that can be driven depends on the data rates
involved, acceptable bit error rate, and the transmission
medium. The maximum distance in ANSI/TIA/EIA-644-A,
the LVDS standard, is 10 meters. This distance is entirely
application dependent.
Should special transmission mediums be used
The μSerDes can be used with any typical differential
transmission medium, including flex circuits, PC board,
and cables.
What impedance should the transmission
cable/flex be
The transmission line should be 100
Ω
differential.
Is a termination resistor needed at the inputs to
the deserializer
No. The 100
Ω
termination resistor is integrated into the
deserializer, so an external resistor is not necessary for
either clock or data lines.
Do trace lengths need to be matched
Yes. Trace lengths need to be matched like any bus
architecture. However, since the serializer and deserializer
have a flow-through design (traces do not need to cross to
connect devices), the effort to achieve this is minimal.
Are there PCB layout guidelines available
Yes. This can be downloaded from the Fairchild website or
may be obtained from
interface@fairchildsemi.com
What is the typical common-mode voltage of the
μSerDes
Typical common-mode voltage is approximately 700mV.
Are there actual Gerber files available to download
to simplify or as an example of design
Yes, please contact Fairchild Interface Group at
interface@fairchildsemi.com
.
Is there a special power-down sequence between
serializer and deserializer
There is no required power-down sequence.
Is there a special power-up sequence between
supplies for either a serializer or deserializer
There is no required power-up sequence for either serializer
or deserializer.
Are there special settings or switches for the PLL
(S1, S2) on the FIN24 serializer
No. The PLL has a very wide range of operation.
When is CTL technology better than single-
ended, current-mode technology
In applications where a transmission line must be AC
coupled or when DC line balancing is necessary, single-
ended, current-mode technology is usually inadequate.
LVDS is superior because DC bias can be restored on the
deserializer side of the solution by using only resistors. In
addition, differential technologies offer better EMI than
single-ended technologies.
How much is EMI reduced using a μSerDes
μSerDes provides ultra-low EMI as compared to legacy
single-ended technologies. The actual amount of EMI
reduction varies per application; however, Fairchild’s EMI
lab has documented cases of greater than -106.1dB
reduction over legacy single-ended technologies.
Is there special grounding scheme required for
μSerDes
No special ground wire is required. The ground wire can be
subject to interference, as with single-ended, current-mode
technologies.
How low is the power in power-down mode
The μSerDes device is specified to use less than 10μA in
power-down mode.
Are EMI filters necessary on the serial link
Many applications no longer require EMI filters. If
additional filtering is required, Fairchild suggests
implementing a shielded flex of ribbon cable for the
following reasons:
Saves space on the PCB.
Makes a solid ground between board assemblies
(no ground bounce).
Sideband signals in flex, not through μSerDes, can
radiate; shielding helps reduce this phenomenon.
ESD/EMI arrays are expensive.
相关PDF资料 |
PDF描述 |
|---|---|
| AN-5061 | Layout Guidelines |
| AN-53 | Implementing an RC5051 DC-DC Converter on Pentium II Motherboards |
| AN-6003 | Shoot-through in Synchronous Buck Converters |
| AN-6006 | LJT 19C 19#20 PIN WALL RECP |
| AN-60 | Application Note 60 (TMC22x5y input data ranges) |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AN-5059 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:LVDS Technology Solves Typical EMI Problems Associated |
| AN505C10-8 | 制造商:AN# - MILITARY 功能描述: |
| AN505C2-9 | 制造商:AN# - MILITARY 功能描述: |
| AN505C2R3 | 制造商:AN# - MILITARY 功能描述: |
| AN505C2R6 | 制造商:AN# - MILITARY 功能描述: |
发布紧急采购，3分钟左右您将得到回复。