LTC488CS 데이터 시트보기 (PDF) - Linear Technology
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LTC488CS Datasheet PDF : 12 Pages
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APPLICATI S I FOR ATIO
LTC488/LTC489
EN
4
3
1 DX
DX
1/4 LTC486
120Ω
SHIELD
SHIELD
12
EN
1
2
3
1/4 LTC488 OR
1/4 LTC489
2
RX
EN
12
DX
4
1/4 LTC486
EN
1
3
DX
RX
Figure 5. Typical Connection
2
120Ω
RX
1/4 LTC488 OR
3
RX
1/4 LTC489
1
488/9 F05
10
10k
1k
1
100
0.1
0.1
1
10
FREQUENCY (MHz)
100
488/9 F06
Figure 6. Attenuation vs Frequency for Belden 9841
10
10k
100k
1M 2.5M 10M
DATA RATE (bps)
488/9 F07
Figure 7. Cable Length vs Data Rate
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
7
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