參數(shù)資料
型號: LTC488IS
廠商: LINEAR TECHNOLOGY CORP
元件分類: 通用總線功能
英文描述: Quad RS485 Line Receiver
中文描述: QUAD LINE RECEIVER, PDSO16
封裝: PLASTIC, SOL-16
文件頁數(shù): 7/12頁
文件大?。?/td> 228K
代理商: LTC488IS
7
LTC488/LTC489
U
S
A
O
PPLICATI
U
U
Figure 5. Typical Connection
120
120
3
RX
2
1
488/9 F05
DX
1
3
SHIELD
RX
EN
DX
1/4 LTC486
12
SHIELD
4
12
3
2
DX
DX
1/4 LTC486
1
EN
1/4 LTC488 OR
1/4 LTC489
RX
3
1
2
4
RX
1/4 LTC488 OR
1/4 LTC489
EN
EN
FREQUENCY (MHz)
0.1
0.1
L
1
10
1
10
100
488/9 F06
Figure 7. Cable Length vs Data Rate
DATA RATE (bps)
10k
10
C
100
1k
10k
100k
1M
10M
488/9 F07
2.5M
Figure 6. Attenuation vs Frequency for Belden 9841
When using low loss cables, Figure 7 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 (> 100kbps), 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,
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
相關(guān)PDF資料
PDF描述
LTC489 Quad RS485 Line Receiver
LTC489C Quad RS485 Line Receiver
LTC489I Quad RS485 Line Receiver
LTC491IN Differential Driver and Receiver Pair
LTC491 Differential Driver and Receiver Pair
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