LM392.pdf
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July 1992
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 compensat-
ed operational amplifier, and the other is a precision voltage
comparator. Both the operational amplifier and the voltage
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 input
down to ground when operating from a single power supply.
Operation from split power supplies is also possible and the
low power supply current is independent of the magnitude
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
circuits. 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.
Features
Y
Wide power supply voltage range
Single supply 3V to 32V
Dual supply
g
1.5V to
g
16V
Y
Low supply current drainÐessentially independent of
supply voltage
600
m
A
Y
Low input biasing current
50 nA
Y
Low input offset voltage
2 mV
Y
Low input offset current
5 nA
Y
Input common-mode voltage range includes ground
Y
Differential input voltage range equal to the power sup-
ply voltage
ADDITIONAL OP AMP FEATURES
Y
Internally frequency compensated for unity gain
Y
Large DC voltage gain
100 dB
Y
Wide bandwidth (unity gain)
1 MHz
Y
Large output voltage swing
0V to V
a
b
1.5V
ADDITIONAL COMPARATOR FEATURES
Y
Low output saturation voltage 250 mV at 4 mA
Y
Output voltage compatible with all types of logic sys-
tems
Advantages
Y
Eliminates need for dual power supplies
Y
An internally compensated op amp and a precision
comparator in the same package
Y
Allows sensing at or near ground
Y
Power drain suitable for battery operation
Y
Pin-out is the same as both the LM358 dual op amp
and the LM393 dual comparator
Connection Diagram
(Top View)
(Amplifier A
e
Comparator)
(Amplifier B
e
Operational Amplifier)
Dual-In-Line Package
TL/H/7793±1
Order Number LM392M or LM2924M
See NS Package Number M08A
Order Number LM392N or LM2924N
See NS Package Number N08E
C
1995 National Semiconductor Corporation
TL/H/7793
RRD-B30M115/Printed in U. S. A.
Absolute Maximum Ratings
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
LM392
LM2924
Supply Voltage, V
a
32V or
g
16V
26V or
g
13V
Differential Input Voltage
32V
26V
Input Voltage
b
0.3V to
a
32V
b
0.3V to
a
26V
Power Dissipation (Note 1)
Molded DIP (LM392N, LM2924N)
820 mW
820 mW
Small Outline Package (LM392M, LM2924M)
530 mW
530 mW
Output Short-Circuit to Ground (Note 2)
Continuous
Continuous
Input Current (V
IN
k
b
0.3 V
DC
) (Note 3)
50 mA
50 mA
Operating Temperature Range
0
§
Cto
a
70
§
C
b
40
§
Cto
a
85
§
C
Storage Temperature Range
b
65
§
Cto
a
150
§
C
b
65
§
Cto
a
150
§
C
Lead Temperature (Soldering, 10 seconds)
260
§
C
260
§
C
ESD rating to be determined.
Soldering Information
Dual-in-Line Package
Soldering (10 seconds)
260
§
C
260
§
C
Small Outline Package
Vapor Phase (60 seconds) 215
§
C 215
§
C
Infrared (15 seconds) 220
§
C 220
§
C
See AN-450 ``Surface Mounting Methods and Their Effect on Product Reliability'' for other methods of soldering
surface mount devices.
Electrical Characteristics
(V
a
e
5V
DC
; specifications apply to both amplifiers unless otherwise stated)
(Note 4)
Parameter
Conditions
LM392
LM2924
Units
Min Typ Max Min Typ Max
Input Offset Voltage
T
A
e
25
§
C, (Note 5)
g
2
g
5
g
2
g
7 mV
Input Bias Current
IN(
a
)orIN(
b
), T
A
e
25
§
C,
50
250
50
250
nA
(Note 6), V
CM
e
0V
Input Offset Current
IN(
a
)
b
IN(
b
), T
A
e
25
§
C
g
5
g
50
g
5
g
50
nA
Input Common-Mode Voltage V
a
e
30 V
DC
,T
A
e
25
§
C,
Range
(Note 7) (LM2924,
0
V
a
b
1.5 0
V
a
b
1.5 V
V
a
e
26 V
DC
)
Supply Current
R
L
e
%
,V
a
e
30V,
1
2
1
2 mA
Supply Current
R
L
e
%
,V
a
e
5V
0.5
1
0.5
1 mA
Amplifier-to-Amplifier Coupling f
e
1 kHz to 20 kHz,
T
A
e
25
§
C, Input Referred,
b
100
b
100
dB
(Note 8)
Input Offset Voltage
(Note 5)
g
7
g
10 mV
Input Bias Current
IN(
a
)orIN(
b
)
400
500
nA
Input Offset Current
IN(
a
)
b
IN(
b
)
150
200
nA
Input Common-Mode Voltage V
a
e
30 V
DC
, (Note 7)
(LM2924, V
a
e
26 V
DC
)
0
V
a
b
2 0
a
2 V
Differential Input Voltage
(or V
b
, if Used), (Note 9)
32
26
V
OP AMP ONLY
Large Signal Voltage Gain
V
a
e
15 V
DC
,V
o
swing
e
1V
DC
to 11 V
DC
,
25 100
25 100
V/mV
R
L
e
2k
X
,T
A
e
25
§
C
2
(LM2924, V
a
e
26V)
Range
Keep All V
IN
's
t
0V
DC
Electrical Characteristics
(V
a
e
5V
DC
; specifications apply to both amplifiers unless otherwise stated)
(Note 4) (Continued)
Parameter
Conditions
LM392
LM2924
Units
Min Typ Max Min Typ Max
OP AMP ONLY
Output Voltage Swing
R
L
e
2k
X
,T
A
e
25
§
C,
0
V
a
b
1.5 0
V
a
b
1.5
(LM2924, R
L
t
10 k
X
)
V
Common-Mode Rejection
DC, T
A
e
25
§
C, V
CM
e
65 70
50 70
dB
Ratio 0 V
DC
to V
a
b
1.5 V
DC
Power Supply Rejection Ratio DC, T
A
e
25
§
C
65 100
50 100
dB
Output Current Source
V
IN(
a
)
e
1V
DC
,
V
IN(
b
)
e
0V
DC
,
V
a
e
15 V
DC
,V
o
e
2V
DC
,T
A
e
25
§
C
20 40
20 40
mA
Output Current Sink
V
IN(
b
)
e
1V
DC
,
V
IN(
a
)
e
0V
DC
,
V
a
e
15 V
DC
,V
o
e
2V
DC
,T
A
e
25
§
C
V
IN(
b
)
e
1V
DC
,
V
IN(
a
)
e
0V
DC
,
10 20
10 20
mA
V
a
e
15 V
DC
,V
o
e
200 mV, T
A
e
25
§
C
12 50
12 50
m
A
Input Offset Voltage Drift
R
S
e
0
X
7
7
m
V/
§
C
Input Offset Current Drift
R
S
e
0
X
10
10
pA
DC
/
§
C
COMPARATOR ONLY
Voltage Gain
R
L
t
15 k
X
,V
a
e
15 V
DC
,
50 200
25 100
V/mV
T
A
e
25
§
C
Large Signal Response Time V
IN
e
TTL Logic Swing,
V
REF
e
1.4 V
DC
V
RL
e
5V
DC
,R
L
e
5.1 k
X
,
T
A
e
25
§
C
300
300
ns
Response Time
V
RL
e
5V
DC
,R
L
e
5.1 k
X
,
1.3
1.5
m
s
T
A
e
25
§
C, (Note 10)
Output Sink Current
V
IN(
b
)
e
1V
DC
,
V
IN(
a
)
e
0V
DC
,
6 16
6 16
mA
V
o
t
1.5 V
DC
,T
A
e
25
§
C
Saturation Voltage
V
IN(
b
)
t
1V
DC
,
V
IN(
a
)
e
0,
250
400
400
mV
I
SINK
s
4 mA, T
A
e
25
§
C
V
IN(
b
)
t
1V
DC
,
V
IN(
a
)
e
0,
700
700
mV
I
SINK
s
4mA
Output Leakage Current
V
IN(
b
)
e
0,
V
IN(
a
)
t
1V
DC
,
0.1
0.1
nA
V
o
e
5V
DC
,T
A
e
25
§
C
V
IN(
b
)
e
0,
V
IN(
a
)
t
1V
DC
,
1.0
1.0
m
A
V
o
e
30 V
DC
Note 1: For operating at temperatures above 25
§
C, the LM392 and the LM2924 must be derated based on a 125
§
C maximum junction temperature and a thermal
resistance of 122
§
C/W which applies for the device soldered in a printed circuit board, operating in still air ambient. The dissipation is the total of both amplifiersÐ
use external resistors, where possible, to allow the amplifier to saturate or to reduce the power which is dissipated in the integrated circuit.
Note 2: Short circuits from the output to V
a
can cause excessive heating and eventual destruction. When considering short circuits to ground, the maximum output
current is approximately 40 mA for the op amp and 30 mA for the comparator independent of the magnitude of V
a
. At values of supply voltage in excess of 15V,
continuous short circuits can exceed the power dissipation ratings and cause eventual destruction.
Note 3: This input current will only exist when the voltage at any of the input leads is driven negative. It is due to the collector-base junction of the input PNP
transistors becoming forward biased and thereby acting as input diode clamps. In addition to this diode action, there is also lateral NPN parasitic transistor action
on the IC chip. This transistor action can cause the output voltages of the amplifiers to go to the V
a
voltage level (or to ground for a large overdrive) for the time
duration that an input is driven negative. This is not destructive and normal output states will re-establish when the input voltage, which was negative, again returns
to a value greater than
b
0.3V (at 25
§
C).
3
Note 4: These specifications apply for V
a
e
5V, unless otherwise stated. For the LM392, temperature specifications are limited to 0
§
C
s
T
A
s a
70
§
C and
the LM2924 temperature specifications are limited to
b
40
§
C
s
T
A
s
a
85
§
C.
Note 5: At output switch point, V
O
j
1.4V, R
S
e
0
X
with V
a
from 5V to 30V; and over the full input common-mode range (0V to V
a
b
1.5V).
Note 6: The direction of the input current is out of the IC due to the PNP input stage. This current is essentially constant, independent of the state of the output
so no loading change exists on the input lines.
Note 7: The input common-mode voltage or either input signal voltage should not be allowed to go negative by more than 0.3V. The upper end of the
common-mode voltage range is V
a
b
1.5V, but either or both inputs can go to 32V without damage (26V for LM2924).
Note 8: Due to proximity of external components, insure that coupling is not originating via the stray capacitance between these external parts. This typically
can be detected as this type of capacitive increases at higher frequencies.
Note 9: Positive excursions of input voltage may exceed the power supply level. As long as the other input voltage remains within the common-mode range,
the comparator will provide a proper output state. The input voltage to the op amp should not exceed the power supply level. The input voltage state must not
be less than
b
0.3V (or 0.3V below the magnitude of the negative power supply, if used) on either amplifier.
Note 10: The response time specified is for a 100 mV input step with 5 mV overdrive. For larger overdrive signals 300 ns can be obtained.
Schematic Diagram
TL/H/7793±2
Application Hints
Please refer to the application hints section of the LM193 and the LM158 datasheets.
4
Physical Dimensions
inches (millimeters)
S.O. Package (M)
Order Number LM392M or LM2924M
NS Package Number M08A
5
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