clc436 National Semiconductor Corporation, clc436 Datasheet - Page 4

• Manufacturer Part Number: clc436
• Description: 200mhz, ?15v, Low-power Voltage Feedback Op Amp
• Manufacturer: National Semiconductor Corporation

Description
The CLC436 is a unity gain stable voltage feedback
amplifier. The voltage feedback topology allows for
capacitors and nonlinear devices in the feedback path.
The matched input bias currents track well over
temperature. This allows the DC offset to be minimized
by matching the impedance seen by both inputs.
The low cost, low power, conventional topology, and
high output current make the CLC436 an excellent
choice for applications such as:
Gain
The non-inverting and inverting gain equations for the
CLC436 are as follows:
Where R
setting resistor. Figure 1 shows the general non-
inverting gain configuration including the recommended
bypass capacitors.
http://www.national.com
Figure 1: Recommended Non-Inverting Gain Circuit
CLC436 Typical Performance Characteristics
1.0
0.8
0.6
0.4
0.2
V
0
in
Power Derating Curves
0
•
•
•
•
Non-inverting Gain:
Inverting Gain:
Low Power Cable Drivers
Active Filters
Buffers
NTSC and PAL Video Systems
20
f
Ambient Temperature ( C)
is the feedback resistor and R
40
R
in
60
80
R
g
100
CLC436
+
-
+V
-V
120
cc
cc
R
R
AJP
AJE
g
f
6.8 F
0.1 F
0.1 F
6.8 F
140 160 180
1
R
f
R
R
g
f
3.0
2.5
2.0
1.5
1.0
0.5
0
R
CLC436 OPERATION
-40
L
I
BI
g
, I
OS
is the gain
-20
, V
V
o
IO
vs. Temperature
Temperature ( C)
0
20
4
Output Drive Performance
The CLC436 can source over 120mA of output current.
It can easily drive 9V
shown in Figure 1 demonstrates the output current
capability of the CLC436.
below, a 3V
used to obtain the result shown in Figure 2.
The high output drive capability of the CLC436 is
suitable for driving capacitive loads. When driving a
capacitive load or coaxial cable, include a series
resistance R
Capacitive Load plot in the typical performance
section to determine the recommended resistance for
various capacitive loads.
Single Supply Operation
The CLC436 can be operated from a single supply
using the topology shown in Figure 3. R
a voltage divider that sets the non-inverting input
DC voltage. The coupling capacitor C1 isolates the
DC bias point from the previous stage. The DC gain
of this circuit is 1 and the high frequency gain is set by
40
R
Figure 2: Large Signal Pulse Response into 50
(V
f
cc
and R
I
V
60
I
= ±15V, A
OS
BI
•
•
IO
-1
-2
-3
-4
-5
5
4
3
2
1
0
R
R
g
f
g
80
.
g
= 499
= 249.5
1.2
1.0
0.8
0.6
0.4
0.2
0
pp
s
v
to improve stability. Refer to the R
= +2, R
input signal and ±15V supplies, were
p
180
160
140
120
100
80
Time (100ns/div)
-10
I
f
BI
pp
= 499
& I
•
•
OS
into a 50
Common Mode Input Voltage
vs. Common Mode Input Voltage
W,
R
R
-5
L
in
R
The circuit values listed
= 50
= 50
L
= 1k
0
V
V
W
out
in
load. The circuit
= 3V
; unless specified)
= 9V
pp
pp
1
5
and R
100
80
60
40
20
0
-20
-40
-60
-80
-100
I
I
OS
BI
2
10
form
s
2.5
2.0
1.5
1.0
0.5
0
W
vs