Datasheet

LM124-N, LM224-N, LM2902-N, LM324-N
SNOSC16B –MAY 2004–REVISED SEPTEMBER 2004 www.ti.com
The bias network of the LM124 establishes a drain current which is independent of the magnitude of the power
supply voltage over the range of from 3 V
DC
to 30 V
DC
.
Output short circuits either to ground or to the positive power supply should be of short time duration. Units can
be destroyed, not as a result of the short circuit current causing metal fusing, but rather due to the large increase
in IC chip dissipation which will cause eventual failure due to excessive junction temperatures. Putting direct
short-circuits on more than one amplifier at a time will increase the total IC power dissipation to destructive
levels, if not properly protected with external dissipation limiting resistors in series with the output leads of the
amplifiers. The larger value of output source current which is available at 25°C provides a larger output current
capability at elevated temperatures (see typical performance characteristics) than a standard IC op amp.
The circuits presented in the section on typical applications emphasize operation on only a single power supply
voltage. If complementary power supplies are available, all of the standard op amp circuits can be used. In
general, introducing a pseudo-ground (a bias voltage reference of V
+
/2) will allow operation above and below this
value in single power supply systems. Many application circuits are shown which take advantage of the wide
input common-mode voltage range which includes ground. In most cases, input biasing is not required and input
voltages which range to ground can easily be accommodated.
TYPICAL SINGLE-SUPPLY APPLICATIONS
(V
+
= 5.0 V
DC
)
*R not needed due to temperature independent I
IN
Figure 2. Non-Inverting DC Gain (0V Input = 0V Output)
Where: V
0
= V
1
+ V
2
− V
3
− V
4
(V
1
+ V
2
) ≥ (V
3
+ V
4
) to keep V
O
> 0 V
DC
Figure 3. DC Summing Amplifier
(V
IN'S
≥ 0 V
DC
and V
O
≥ V
DC
)
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Product Folder Links: LM124-N LM224-N LM2902-N LM324-N