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CLC453 Datasheet(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # CLC453
Description  Comlinear CLC453 Single Supply, Low-Power, High Output, Programmable Buffer
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

CLC453 Datasheet(HTML) 11 Page - National Semiconductor (TI)

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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 (Zo) set:
s
RL = Zo
s
Rm = Req
Where Req is the transformed value of the load imped-
ance, (RL), and is approximated by:
Select the transformer so that it loads the line with a
value close to Zo, over the desired frequency range. The
output impedance, Ro, 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 Ro.
The load current (IL) and voltage (Vo) 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
≤ ⋅
453 Fig13
+
Vo
-
Rm
RL
Zo
UTP
IL
Req
1:n
V = Av Vin
V
n
4
A V
v in
=
V
-n
4
A V
v in
=
V
1n
2
A V
o
v in
=
Vin
Rt
1
CLC453
7
6
8
5
3
4
2
1k
1k
0.1
µF
6.8
µF
+
VEE
Av = 2


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