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| 型號(hào)： | ECL |
| 英文描述： | ECL Output Termination Techniques (91k) |
| 中文描述： | ECL輸出終端技術(shù)（91k） |
| 文件頁(yè)數(shù)： | 3/6頁(yè) |
| 文件大?。?/td> | 91K |
| 代理商： | ECL |
3
www.semtech.com
HIGH-PER.ORMANCE PRODUCTS
Revision 1/January 9, 2002
AN1003
Series Termination: Pull-down resistor to VEE
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o
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m
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v
a
d
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p
t
u
O
C
IRT ()
0
59
6
28
.
99
.
2
18
.
5
2
5
79
9
39
.
76
.
88
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59
.
45
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Table 4
Series Termination
Using series damping or series termination technique
may control overshoot and ringing on longer transmis-
sion lines. Series damping is accomplished by insert-
ing a small resistor Rs in series with the output of the
gate as shown in figure 3. In this case the value of R
T
is such that it can drive 5-15mA of current. It is manda-
tory that R
S
added to the output impedance must be
equal to Zo. Signal transmitted from point A is
reflectedat point B. But due to the presence of R
S
(R
S
+R
OUT
=Zo), this signal is not seen at B. The advan-
tage of this method is that the power does not increase
as much as in the parallel termination method even
when multiple lines are connected to A. Series Termi-
nation scheme does not require an extra power supply
for termination. It is cost effective, easy to implement,
absorbs any reflections returning to source, and is ideal
for Back-plane designs, or any designs with impedance
discontinuities.
The driven inputs must be near the end of the line to
avoid receiving a 2-step signal.
Table 4 depicts aver-
age current consumption and power dissipation for dif-
ferent transmission line impedance values using se-
ries termination scheme.
Some recommended values for
R
T
at different supply volt-
ages are:
R
T
= 150
for Vcc = 3.3V
R
T
= 270
for Vcc = 5.0V
Rs = 43
for Zo = 50 and Vcc = 3.0V to 5.5V
Typical ECL/PECL Device
Transmission Line
Zo = 50
Figure 3
RT
RS
A
B
RT
RS
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