clc423 National Semiconductor Corporation, clc423 Datasheet - Page 4

• Manufacturer Part Number: clc423
• Description: Comlinear Clc423 94mhz, Single Supply Voltage Feedback Op Amp
• Manufacturer: National Semiconductor Corporation

Description
The CLC423 is a voltage feedback amplifier designed for
single supply operation. The CLC423 is a single version
of the CLC427 with the following features:
Single Supply Operation (V
The CLC423 is designed to operate from 0 and 5V
supplies. The specifications given in the Electrical
Characteristics table are measured with a common
mode voltage (V
which the inputs are applied and the output voltages are
specified.
Operating from a single +5V supply, the CMIR of the
CLC423 is typically 0V to +3.7V. The typical output range
with R
For DC coupled single supply operation, it is recom-
mended that input signal levels remain above ground.
For input signals that drop below ground, AC coupling
and level shifting the signal are possible remedies.
For input signals that remain above ground, no
adjustments need to be made. The non-inverting and
inverting configurations for both input conditions are
illustrated in the following 2 sections.
DC Coupled Single Supply Operation
Figures 1 and 2 show the recommended non-inverting
and inverting configurations for purely positive input
signals.
http://www.national.com
V
L
in
Operates from a single +5V supply
Maintains near rail-to-rail performance
Includes the negative rail (0V) in the Common
Mode Input Range (CMIR)
Offers low -74/-94dBc 2nd and 3rd harmonic
distortion
Provides BW > 20MHz and 1MHz distortion
< -50dBc at V
= 150
Figure 1: Non-inverting Configuration
R
is +0.35V to +4.5V.
cm
t
) of 2.5V. V
o
R
= 4V
3
2
g
CLC423
-
+
+5V
pp
CC
4
7
cm
= +5V, V
6.8 F
0.1 F
+
R
V
V
is the voltage around
6
f
in
o
1
CLC423 OPERATIONS
EE
R
R
g
f
= GND)
V
o
4
AC Coupled Single Supply Operation
Figures 3 and 4 show possible non-inverting and
inverting configurations for input signals that go below
ground. The input is AC coupled to prevent the need
for level shifting the input signal at the source. The
resistive voltage divider biases the non-inverting input to
V
Figure 3: AC Coupled Non-inverting Configuration
CC
low frequency cutoff
low frequency cutoff
V
V
o
o
Figure 4: AC Coupled Inverting Configuration
÷ 2 = 2.5V.
V
V
V
V
in
in
in
in
V
1
in
Figure 2: Inverting Configuration
C
R
R
c
R
R
g
f
R
g
f
t
2.5V
R
2.5
2.5V
R
C
2.5
R
b
g
g
c
2 R C
2 R C
V
V
in
o
3
2
1
1
g c
in c
CLC423
R
R
R
R
+
-
+5V
R
R
, where: R
g
f
7
4
R
6.8 F
0.1 F
C
3
2
Select R to yield
desired R
3
2
+
R
g
6
CLC423
f
CLC423
-
-
+
+
+5V
+5V
in
4
4
7
7
R
t
2
in
6.8 F
0.1 F
6.8 F
0.1 F
+
+
R
R
6
R || R
6
f
f
V
t
o
R C
R
g
g
R
source
RC
V
V
o
o
c