LM392/LM2924 Low Power Operational Amplifier/Voltage Comparator
April 1998
LM392/LM2924
Low Power Operational Amplifier/Voltage Comparator
General Description
The LM392 series consists of 2 independent building block
circuits. One is a high gain, internally frequency compen-
sated operational amplifier, and the other is a precision volt-
age comparator. Both the operational amplifier and the volt-
age comparator have been specifically designed to operate
from a single power supply over a wide range of voltages.
Both circuits have input stages which will common-mode in-
put down to ground when operating from a single power sup-
ply. Operation from split power supplies is also possible and
the low power supply current is independent of the magni-
tude of the supply voltage.
Application areas include transducer amplifier with pulse
shaper, DC gain block with level detector, VCO, as well as all
conventional operational amplifier or voltage comparator cir-
cuits. Both circuits can be operated directly from the stan-
dard 5 V
DC
power supply voltage used in digital systems,
and the output of the comparator will interface directly with
either TTL or CMOS logic. In addition, the low power drain
makes the LM392 extremely useful in the design of portable
equipment.
n
Power drain suitable for battery operation
n
Pin-out is the same as both the LM358 dual op amp and
the LM393 dual comparator
Features
n
Wide power supply voltage range
Single supply: 3V to 32V
Dual supply:
±
1.5V to
±
16V
n
Low supply current drain — essentially independent of
supply voltage: 600 µA
n
Low input biasing current: 50 nA
n
Low input offset voltage: 2 mV
n
Low input offset current: 5 nA
n
Input common-mode voltage range includes ground
n
Differential input voltage range equal to the power
supply voltage
n
n
n
n
ADDITIONAL OP AMP FEATURES
Internally frequency compensated for unity gain
Large DC voltage gain: 100 dB
Wide bandwidth (unity gain): 1 MHz
Large output voltage swing: 0V to V
+
− 1.5V
Advantages
n
Eliminates need for dual power supplies
n
An internally compensated op amp and a precision
comparator in the same package
n
Allows sensing at or near ground
ADDITIONAL COMPARATOR FEATURES
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Low output saturation voltage: 250 mV at 4 mA
n
Output voltage compatible with all types of logic systems
Connection Diagram
(Amplifier A = Comparator)
(Amplifier B = Operational Amplifier)
Dual-In-Line Package
DS007793-1
(Top View)
Order Number LM392M or LM2924M
See NS Package Number M08A
Order Number LM392N or LM2924N
See NS Package Number N08E
© 1999 National Semiconductor Corporation
DS007793
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
