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參數(shù)資料
| 型號： | CLC453 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 198K |
| 代理商： | CLC453 |
http://www.national.com
10
I
R
t
- Optional resistor for inverting gain configura-
tions (Select R
t
to yield desired input impedance
= R
g
|| R
t
)
I
C
1
, C
2
- 0.1
μ
F ceramic capacitors
I
C
3
, C
4
- 6.8
μ
F tantalum capacitors
Components not used:
I
C
5
, C
6
, C
7
, C
8
I
R
1
thru R
8
The evaluation boards are designed to accommodate
dual supplies. The boards can be modified to provide
single supply operation. For best performance; 1) do
not connect the unused supply, 2) ground the unused
supply pin.
SPICE Models
SPICE models provide a means to evaluate amplifier
designs. Free SPICE models are available for
Comlinear’s monolithic amplifiers that:
I
Support Berkeley SPICE 2G and its many derivatives
I
Reproduce typical DC, AC, Transient, and Noise
performance
I
Support room temperature simulations
The
readme
file that accompanies the diskette lists
released models, and provides a list of modeled parame-
ters. The application note OA-18, Simulation SPICE
Models for Comlinear’s Op Amps, contains schematics
and a reproduction of the readme file.
Single Supply Cable Driver
The typical application shown on the front page shows
the CLC450 driving 10m of 75
coaxial cable. The
CLC450 is set for a gain of +2V/V to compensate for the
divide-by-two voltage drop at V
o
.
Single Supply Lowpass Filter
Figures 9 and 10 illustrate a lowpass filter and design
equations. The circuit operates from a single supply of
+5V. The voltage divider biases the non-inverting input to
2.5V. And the input is AC coupled to prevent the need for
level shifting the input signal at the source. Use the
design equations to determine R
1
, R
2
, C
1
, and C
2
based
on the desired Q and corner frequency.
Figure 9: Lowpass Filter Topology
Figure 10: Design Equations
This example illustrates a lowpass filter with Q = 0.707
and corner frequency f
c
= 10MHz. A Q of 0.707 was cho-
sen to achieve a maximally flat, Butterworth response.
Figure 11 indicates the filter response.
Figure 11: Lowpass Response
Twisted Pair Driver
The high output current and low distortion, of the
CLC450, make it well suited for driving transformers.
Figure 12 illustrates a typical twisted pair driver utilizing
the CLC450 and a transformer. The transformer
provides the signal and its inversion for the twisted pair.
Figure 12: Twisted Pair Driver
To match the line’s characteristic impedance (Z
o
) set:
I
R
L
= Z
o
I
R
m
= R
eq
Application Circuits
+
CLC450
-
450 Fi 9
R
f
1k
0.1
μ
F
C
1
V
o
V
in
R
g
0.1
μ
F
5k
4
7
6
0.1
μ
F
5k
R
1
158
3
2
+5V
0.1
μ
F
100
1.698k
R
2
158
C
2
100pF
Gain
K
1
R
R
Corner frequency
1
R R C C
Q
1
R C
R C
R C
R C
(1 K)
R C
R C
For R
R
R and C
C
C
1
RC
Q
1
(3 K)
f
g
c
2
2
1
2
1
2
c
=
= +
=
=
=
+
+
=
=
=
=
=
=
ω
ω
M
Frequency (Hz)
-21
-15
-9
-3
3
1M
10M
100M
+
CLC450
-
+
V
o
-
R
m
R
f
R
g
V
in
R
t
R
L
Z
o
UTP
I
L
R
eq
I:n
V = A
v
V
in
6
3
2
A
1
R
R
v
f
g
= +
V
n
v in
=
V
-n
4
A V
=
V
1n
2
A V
o
=
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