參數(shù)資料
型號(hào): Am7969
廠商: Advanced Micro Devices, Inc.
英文描述: TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface)
中文描述: TAXIchip集成電路(透明異步Xmitter,接收器接口)
文件頁數(shù): 74/127頁
文件大?。?/td> 730K
代理商: AM7969
AMD
70
TAXIchip Integrated Circuits Technical Manual
S ample V alues
Using RG-58A/U, 50
coaxial cable, a successful TAXI link was established using the
following component values:
R1 = 68
R2 = 200
RE = 300
C
= 0.1
μ
F
5.7 Interfac ing to T wisted-Pair Cable
Another low cost alternative twisted pair cable. Twisted pair cable is generally more
lossy than coaxial cable making it suitable only for short distances. To reduce the
possibility of noise being induced along the line, the shielded twisted-pair cable is
recommended.
Using the TAXlchip set with shielded-twisted-pair as the serial medium is very similar to
using it with coaxial cable. The recommended configuration is shown in Figure 5-11,
where each of the components that make up the interface serve the same purpose as in
the AC-coupled TAXl-fiber optic interface shown in Figure 5-9.
Note that with shielded-twisted-pair, only one cable is required to form the link. The
twisted-pair conductors carry the differential pseudo-ECL signals and the shield is
grounded at the Receiver.
Figure 5-11
S hielded-T wisted Pair Cable Interfac e
12330E-18
R1
RE
L, Z0
C
C
RE
+5 V
R2
R1
+
+
+5 V
R2
R1R2
R1+ R2
= Z0/2
5R2
R1+ R2
= 3.7 V
= ECL Signal Swing
186
RE
7.2 (Z0)
C = Largest RF Capacitor Available
TAXI
TX
TAXI
RX
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