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参数资料
| 型号： | LTC486IN |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 通用总线功能 |
| 英文描述： | Quad Low Power RS485 Driver |
| 中文描述： | LINE DRIVER, PDIP16 |
| 封装： | PLASTIC, DIP-16 |
| 文件页数： | 6/8页 |
| 文件大小： | 227K |
| 代理商： | LTC486IN |
LTC486
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When using low loss cables, Figure 8 can be used as a
guideline for choosing the maximum line length for a given
data rate. With lower quality PVC cables, the dielectric loss
factor can be 1000 times worse. PVC twisted pairs have
terrible losses at high data rates (>100kbs) and greatly
reduce the maximum cable length. At low data rates
however, they are acceptable and much more economical.
Cable Termination
The proper termination of the cable is very important. If the
cable is not terminated with its characteristic impedance,
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LTC486 TA07
120
DX
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SHIELD
120
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RX
SHIELD
3
DX
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4
2
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EN
4
1
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RX
RX
3
DX
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1/4 LTC488
1/4 LTC486
1/4 LTC488
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Losses in a transmission line are a complex combination
of DC conductor loss, AC losses (skin effect), leakage, and
AC losses in the dielectric. In good polyethylene cables
such as the Belden 9841, the conductor losses and dielec-
tric losses are of the same order of magnitude, with
relatively low overall loss (Figure 7).
FREQUENCY (MHz)
0.1
0.1
L
1
10
1
10
100
LTC486 TA08
Figure 7. Attenuation vs Frequency for Belden 9841
DATA RATE (bps)
10k
10
C
100
1k
10k
100k
1M
10M
LTC486 TA09
2.5M
distorted waveforms will result. In severe cases, distorted
(false) data and nulls will occur. A quick look at the output
of the driver will tell how well the cable is terminated. It is
best to look at a driver connected to the end of the cable,
since this eliminates the possibility of getting reflections
from two directions. Simply look at the driver output while
transmitting square wave data. If the cable is terminated
properly, the waveform will look like a square wave
(Figure 9).
If the cable is loaded excessively (e.g., 47
), the signal
initially sees the surge impedance of the cable and jumps
to an initial amplitude. The signal travels down the cable
and is reflected back out of phase because of the
mistermination. When the reflected signal returns to the
driver, the amplitude will be lowered. The width of the
pedestal is equal to twice the electrical length of the cable
(about 1.5ns/ft). If the cable is lightly loaded (e.g., 470
),
Figure 8. Cable Length vs Data Rate
Figure 6. Typical Connection
相关PDF资料 |
PDF描述 |
|---|---|
| LTC486IS | Quad Low Power RS485 Driver |
| M141331FAP | Thick Film Low Profile SIP Conformal Coated Resistor Networks |
| M141331FM1 | Thick Film Low Profile SIP Conformal Coated Resistor Networks |
| M141331FM2 | Thick Film Low Profile SIP Conformal Coated Resistor Networks |
| M141331GAP | Thick Film Low Profile SIP Conformal Coated Resistor Networks |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC486IN#PBF | 功能描述:IC DVR RS485 LOW PWR QUAD 16-DIP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
| LTC486ISW | 功能描述:IC DVR RS485 LOW PWR QUAD 16SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
| LTC486ISW#PBF | 功能描述:IC DVR RS485 LOW PWR QUAD 16SOIC RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
| LTC486ISW#PBF | 制造商:Linear Technology 功能描述:Differential Bus/Line Driver IC |
| LTC486ISW#TR | 功能描述:IC DRIVER RS485 QUAD LP 16SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
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