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參數(shù)資料
| 型號(hào)： | CLC453ALC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Comlinear CLC453 Single Supply, Low-Power, High Output, Programmable Buffer |
| 中文描述： | BUFFER AMPLIFIER, UUC5 |
| 封裝： | DIE |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 330K |
| 代理商： | CLC453ALC |
11
http://www.national.com
Twisted Pair Driver
The high output current and low distortion, of the
CLC453, make it well suited for driving transformers.
Figure 13 illustrates a typical twisted pair driver utilizing
the CLC453 and a transformer. The transformer
provides the signal and its inversion for the twisted pair.
Figure 13: Twisted Pair Driver
To match the line’s characteristic impedance (Z
o
) set:
I
R
L
= Z
o
I
R
m
= R
eq
Where R
eq
is the transformed value of the load imped-
ance, (R
L
), and is approximated by:
Select the transformer so that it loads the line with a
value close to Z
o
, over the desired frequency range. The
output impedance, R
o
, of the CLC453 varies with
frequency and can also affect the return loss. The return
loss, shown below, takes into account an ideal
transformer and the value of R
o
.
The load current (I
L
) and voltage (V
o
) are related to the
CLC453’s maximum output voltage and current by:
From the above current relationship, it is obvious that an
amplifier with high output drive capability is required.
R
R
n
eq
L
2
=
Return Loss(dB)
20log
n
R
Z
10
2
o
o
≈
V
n V
I
I
n
o
max
L
max
≤
≤
+
V
o
-
R
m
R
L
Z
o
UTP
I
L
R
eq
1:n
V = A
v
V
in
V
n
v in
=
V
-n
4
A V
v in
=
V
1n
2
A V
v in
o
=
V
in
R
t
1
CLC453
7
6
8
5
3
4
2
1k
1k
0.1
μ
F
6.8
μ
F
+
V
EE
A
v
= 2
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