参数资料
| 型号： | EL4543IUZ-T7 |
| 厂商： | Intersil |
| 文件页数： | 4/18页 |
| 文件大小： | 0K |
| 描述： | IC DRVR TWISTED TRPL DIFF 24QSOP |
| 标准包装： | 1,000 |
| 应用： | 驱动器 |
| 输出类型： | 差分 |
| 电路数： | 3 |
| -3db带宽： | 350MHz |
| 转换速率： | 1000 V/µs |
| 电流 - 电源： | 14.5mA |
| 电流 - 输出 / 通道： | 60mA |
| 电压 - 电源，单路/双路(±)： | 5 V ~ 12 V，±2.5 V ~ 6 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-QSOP |
| 包装： | 带卷 (TR) |
12
FN7325.11
September 13, 2007
Extract Common Mode Sync and Decode HSYNC
and VSYNC
HSYNC and VSYNC can be regenerated from the Common
Mode sync output voltages. The relationships between
HSYNC, VSYNC and the 3 common mode levels are given by
Table 1. The common mode levels are easily separated from
the differential outputs of the EL4543 using this simple
resistor network at the cable receiver input of each
differential channel; see Figure 39.
Twisted Pair Termination
The schematic in Figure 39 illustrates a termination scheme for
50
Ω series termination and a 100Ω twisted pair cable. Note
RCM is the common mode termination to allow measurement
of VCM and should not be too small since it loads the EL4543; a
little over a 100
Ω is recommended for RCM.
Video Transmission
The EL4543 is a twisted pair differential line driver directed at
the transmission of Video Signals through cables up to 100
feet; however, as signal losses increase with transmission line
length the EL4543 will need additional support to equalize
video signals along longer twisted pair transmission lines. A
full solution to accomplish this is the SXGA Video
Transmission System presented in the EL4543 Data Sheet.
Note the inclusion of the EL9110 for signal equalization of up
to 1000ft of CAT5 cable and common mode extraction; see
Data Sheet for additional information on the EL9110.
Long Distance Video Transmission
The SXGA Video Transmission System makes it possible to
transmit Red, Green and Blue (RGB) video plus sync up to
1000 feet through CAT5 cable. The input to the SXGA Video
Transmission System is the output of a video source
transmitting RGB video signals plus sync. The signals are
received initially by the EL4543; which converts the single
ended input RGB signals to three fully differential waveforms
with sync encoded on the discrete common modes of each
color channel and then drives the signals through a length of
CAT5 cable. The signal is received by the EL9110, which
can provide 6-pole equalization for both high and low
frequency signal transmission line losses. Then the EL9110
converts the differential RGB video signals back into single
ended format while extracting the common mode component
for decoding. The single ended RGB signal is taken directly
from the output of the El9110 and is ready for the output
device. The Common Mode Decoder Circuit receives the
common mode signals directly from each of the three
EL9110's common mode output pin, decodes and transmits
HSYNC and VSYNC to the output device.
Sync Transmission
The EL4543 encodes HSYNC and VSYNC signals onto the
common mode output of the differential video signals; Red,
Green and Blue respectively. Data Sheet Figure 8 clearly
illustrates that the sum of the common mode voltages results
in a fixed DC level with no AC content; thus eliminating EMI
interference.
Output Drive Protection
The EL4543 has internal short circuit protection set typically
at 60mA. if the output is shorted for extended periods of time
the increased power dissipation will eventually destroy the
part. To realize maximum reliability the output current should
never exceed 60mA. The 50
Ω series back load matching
resistor provides additional protection.
Supply Voltage
While the EL4543 can be operated on ±5V split rails, single
supply 0V to 5V is the most common usage. It is very
important to note that the input logic thresholds are relative
to the negative supply pin, and therefore single supply,
ground referenced logic will not work when driving the
EL4543 on split rails. The amplifiers have an input common
mode range from 0V to 2.3V with a 0V to 5V supply,
increasing with supply voltage (see Figure 7). The common
mode output DC level range is a linear function of the power
supply (see Figures 16, 17, 18, and 19). The common mode
input switching threshold as well as the Enable/Disable input
is a linear function of the supply voltage (see Figures 8 and
11). In the event that the EL4543 is to be used with ±5V split
rails then the input sync signals need to be voltage offset
before they are input to the EL4543. The circuit configuration
depicted in Figure 40 provides for the proper level shift.
-
+
VREF
-
+
TWISTED
PAIR
ZO=100Ω
50
Ω
50
Ω
50
Ω
50
Ω
120
Ω
VCM
(RCM: SHOULD BE >100
Ω)
(FOR LOADING
CONSIDERATIONS)
TYPICAL EL4543 TERMINATION DRIVER
FIGURE 39. TWISTED PAIR TERMINATION EL4543
EL4543
HSYN Pin
2.70k
4.30k
KST2907A
-5V
Horizontal Sync in
2.70k
4.30k
KST2907A
-5V
Vertical Sync in
EL4543
VSYN Pin
FIGURE 40. LEVEL SHIFTING SYNC SIGNALS FOR USE
WITH ±5V SPLIT RAILS
EL4543
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EL4544 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Triple 16x5 Differential Crosspoint Switch Capable of Operation in Single-Ended or Differential Input Modes |
| EL4544_07 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Triple 16x5 Differential Crosspoint Switch Capable of Operation in Single-Ended or Differential Input Modes |
| EL4544_0712 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Triple 16x5 Differential Crosspoint Switch Capable of Operation in Single-Ended or Differential Input Modes |
| EL4544IGZ | 功能描述:模拟和数字交叉点 IC EL4544IGZ TRPL 16X5 DIFF TO SNGL-ENDED C RoHS:否 制造商:Micrel 配置:2 x 2 封装 / 箱体:MLF-16 数据速率:10.7 Gbps 输入电平:CML, LVDS, LVPECL 输出电平:CML 电源电压-最大:3.6 V 电源电压-最小:2.375 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 产品:Digital Crosspoint 封装:Tube |
| EL4581 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Sync Separator, 50% Slice, S-H, Filter |
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