- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄16414 > DP83848C-MAU-EK (National Semiconductor)BOARD EVALUATION DP83848C PDF資料下載
參數(shù)資料
| 型號： | DP83848C-MAU-EK |
| 廠商： | National Semiconductor |
| 文件頁數(shù)： | 22/86頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION DP83848C |
| 標準包裝： | 1 |
| 主要目的： | 接口，以太網(wǎng) |
| 已用 IC / 零件： | DP83848C |
| 已供物品： | 板 |
| 相關(guān)產(chǎn)品： | DP83848CVVX/NOPBTR-ND - TXRX ETHERNET PHYTER 48-LQFP DP83848CVV-ND - IC TXRX ETHERNET PHYTER 48-LQFP |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁當前第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁
www.national.com
28
DP
83
84
8C
4.2.2.1 Digital Adaptive Equalization and Gain Control
When transmitting data at high speeds over copper twisted
pair cable, frequency dependent attenuation becomes a
concern. In high-speed twisted pair signalling, the fre-
quency content of the transmitted signal can vary greatly
during normal operation based primarily on the random-
ness of the scrambled data stream. This variation in signal
attenuation caused by frequency variations must be com-
pensated to ensure the integrity of the transmission.
In order to ensure quality transmission when employing
MLT-3 encoding, the compensation must be able to adapt
to various cable lengths and cable types depending on the
installed environment. The selection of long cable lengths
for a given implementation, requires significant compensa-
tion which will over-compensate for shorter, less attenuat-
ing lengths. Conversely, the selection of short or
intermediate cable lengths requiring less compensation will
cause serious under-compensation for longer length
cables. The compensation or equalization must be adap-
tive to ensure proper conditioning of the received signal
independent of the cable length.
The DP83848C utilizes an extremely robust equalization
scheme referred as ‘Digital Adaptive Equalization.’
The Digital Equalizer removes ISI (inter symbol interfer-
ence) from the receive data stream by continuously adapt-
ing to provide a filter with the inverse frequency response
of the channel. Equalization is combined with an adaptive
gain control stage. This enables the receive 'eye pattern' to
be opened sufficiently to allow very reliable data recovery.
The curves given in Figure 8 illustrate attenuation at certain
frequencies for given cable lengths. This is derived from
the worst case frequency vs. attenuation figures as speci-
fied in the EIA/TIA Bulletin TSB-36. These curves indicate
the significant variations in signal attenuation that must be
compensated for by the receive adaptive equalization cir-
cuit.
Figure 8. EIA/TIA Attenuation vs. Frequency for 0, 50,
100, 130 & 150 meters of CAT 5 cable
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 2-5492591-0 | CA 50/125UMRIS SCDUP/2.5BAY 20M1 |
| 6278899-1 | CA,62.5,MTRJ-SC |
| L-07W18NKV4T | WIREWOUND INDUCTOR 18NH 0402 |
| ECM24DRSN | CONN EDGECARD 48POS DIP .156 SLD |
| 1-6828318-2 | C/A,2.0MM,RISER,XG,AQUA,LC-SC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DP83848C-POE-EK | 功能描述:以太網(wǎng)開發(fā)工具 DP83848 POE CARD COMM TEMP RoHS:否 制造商:Micrel 產(chǎn)品:Evaluation Boards 類型:Ethernet Transceivers 工具用于評估:KSZ8873RLL 接口類型:RMII 工作電源電壓: |
| DP83848CVV | 制造商:Texas Instruments 功能描述:IC, 10/100 ETHERNET PHY, SMD, LQFP48 |
| DP83848CVV/NOPB | 功能描述:以太網(wǎng) IC PHYTER COMMERCIAL TEMP SGL PORT RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
| DP83848CVV/NOPB | 制造商:Texas Instruments 功能描述:Ethernet Transceiver |
| DP83848CVVX | 制造商:Texas Instruments 功能描述:PHY 1-CH 10Mbps/100Mbps 48-Pin LQFP T/R |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。