參數(shù)資料
型號： Am7968-175DMC
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)： 72/127頁
文件大?。?/td> 730K
代理商： AM7968-175DMC
AMD
68
TAXIchip Integrated Circuits Technical Manual
5.5.2 AC-Coupled T AX l-Fiber Optic T ransc eiver Interfac e
Some applications will require the TAXIchip set to optical transceiver interconnection to
be AC-coupled. AC coupling should be used in the following situations: a) when the
TAXIchip set and optical components are driven by a common power supply but the
supply pins are decoupled using the scheme recommended in Chapter 6, and b) when
the TAXIchip set and optical components operate on different power supplies.
AC coupling via capacitors along with the necessary design equations is shown in
Figure 5-9. In this configuration, RE is the ECL output pull-down resistor, C provides the
AC coupling, the connection is made with a transmission line (coax, twisted pair,
microstrip) of length L and characteristic impedance, Z0, and R1 and R2 provide a
matched line termination and voltage bias to the midpoint of the optical component’s
logic swing (V
bb
).
The configuration shown in Figure 5-9 is recommended for any line length, L, which
separates the TAXIchip set and the optical module. Although the matched line termina-
tion is not necessary for L<3
″
, the V
bb
bias voltage is always needed for AC-coupled
links. Therefore, even for line lengths where matched line terminations are not neces-
sary (less than 3
″
), the resistors R1 and R2 can be chosen to give a matched load
without any added complexity.
Figure 5-9
AC-Coupled T AX l-Fiber Optic al Interfac e
12330E-16
TAXI
TX
+
–
ODL
TX
+
–
R2
R2
L, Z0
+5 V
R1
R1
C
C
V
EE
V
bb
RE
RE
V
CC
TAXI
RX
+
–
ODL
RX
+
–
RE
RE
L, Z0
+5 V
C
C
V
EE
R4
R4
V
CC
R3
R3
R1R2
R1+ R2
= Z0
5R4
R3+ R4
= 3.7 V
R3R4
R3+ R4
=
= ECL Signal Swing
V
bb
=Signal Swing
=
V
IH
+
V
IL
2
= V
EE
+
(V
CC
–
V
EE
) R2
R1 + R2
186 < RE < 7.2 (Z0)
C = Largest RF Capacitor Available
Optical Fiber
5.6 Interfac ing to Coaxial Cable
In many applications, system cost can be reduced by using coaxial cable as the serial
media. Unlike optical fiber, which requires optical components between the fiber and the
TAXIchip set, coaxial cable can be connected directly to the TAXI SEROUT pins, giving
lower system costs.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM7968-175JC 制造商:Rochester Electronics LLC 功能描述:
AM7968-175JC-G 制造商:Rochester Electronics LLC 功能描述:- Bulk
AM7968-175LKC 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface)
AM7968-175LMC 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface)
AM7968-175PC 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Transmitter
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