LM392
LM392 Low Power Operational Amplifier/Voltage Comparator
Literature Number: SNOSBT5C
LM392
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
voltage comparator. Both the operational amplifier and the
voltage comparator have been specifically designed to op-
erate 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 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.
Advantages
nEliminates need for dual power supplies
nAn internally compensated op amp and a precision
comparator in the same package
nAllows sensing at or near ground
nPower drain suitable for battery operation
nPin-out is the same as both the LM358 dual op amp and
the LM393 dual comparator
Features
nWide power supply voltage range
Single supply: 3V to 32V
Dual supply: ±1.5V to ±16V
nLow supply current drain — essentially independent of
supply voltage: 600 µA
nLow input biasing current: 50 nA
nLow input offset voltage: 2 mV
nLow input offset current: 5 nA
nInput common-mode voltage range includes ground
nDifferential input voltage range equal to the power
supply voltage
ADDITIONAL OP AMP FEATURES
nInternally frequency compensated for unity gain
nLarge DC voltage gain: 100 dB
nWide bandwidth (unity gain): 1 MHz
nLarge output voltage swing: 0V to V
+
− 1.5V
ADDITIONAL COMPARATOR FEATURES
nLow output saturation voltage: 250 mV at 4 mA
nOutput voltage compatible with all types of logic systems
Connection Diagram
(Amplifier A = Comparator)
(Amplifier B = Operational Amplifier)
Dual-In-Line Package
00779301
(Top View)
Order Number LM392M or LM392MX
See NS Package Number M08A
Order Number LM392N
See NS Package Number N08E
August 2000
LM392 Low Power Operational Amplifier/Voltage Comparator
© 2004 National Semiconductor Corporation DS007793 www.national.com
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
LM392
Supply Voltage, V
+
32V or ±16V
Differential Input Voltage 32V
Input Voltage −0.3V to +32V
Power Dissipation (Note 2)
Molded DIP (LM392N) 820 mW
Small Outline Package (LM392M) 530 mW
Output Short-Circuit to Ground (Note 3) Continuous
Input Current (V
IN
<−0.3 V
DC
) (Note 4) 50 mA
Operating Temperature Range 0˚C to +70˚C
Storage Temperature Range −65˚C to +150˚C
Lead Temperature (Soldering, 10 seconds) 260˚C
ESD rating to be determined.
Soldering Information
Dual-in-Line Package
Soldering (10 seconds) 260˚C
Small Outline Package
Vapor Phase (60 seconds) 215˚C
Infrared (15 seconds) 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
+
=5V
DC
; specifications apply to both amplifiers unless otherwise stated) (Note 5)
Parameter Conditions LM392 Units
Min Typ Max
Input Offset Voltage T
A
= 25˚C, (Note 6) ±2±5mV
Input Bias Current IN(+) or IN(−), T
A
=25˚C, (Note 7) , V
CM
=
0V
50 250 nA
Input Offset Current IN(+) − IN(−), T
A
= 25˚C ±5±50 nA
Input Common-Mode Voltage Range V
+
=30V
DC
,T
A
= 25˚C, (Note 8) 0 V
+
−1.5 V
Supply Current R
L
=∞,V
+
=30V 1 2 mA
Supply Current R
L
=∞,V
+
= 5 V 0.5 1 mA
Amplifier-to-Amplifier Coupling f = 1 kHz to 20 kHz, T
A
= 25˚C, Input
Referred, (Note 9)
−100 dB
Input Offset Voltage (Note 6) ±7mV
Input Bias Current IN(+) or IN(−) 400 nA
Input Offset Current IN(+) − IN(−) 150 nA
Input Common-Mode Voltage Range V
+
=30V
DC
, (Note 8) 0 V
+
−2 V
Differential Input Voltage Keep All V
IN
’
s
≥0V
DC
(or V
−
, if used ) (Note
10)
32 V
LM392
www.national.com 2
Electrical Characteristics (Continued)
(V
+
=5V
DC
; specifications apply to both amplifiers unless otherwise stated) (Note 5)
Parameter Conditions LM392 Units
Min Typ Max
OP AMP ONLY
Large Signal Voltage Gain V
+
=15V
DC
,V
o
swing=1V
DC
to 11 V
DC
,
R
L
=2kΩ,T
A
= 25˚C
25 100 V/mV
Output Voltage Swing R
L
=2kΩ,T
A
= 25˚C 0 V
+
−1.5 V
Common-Mode Rejection Ratio DC, T
A
= 25˚C, V
CM
=0,V
DC
to V
+
−1.5 V
DC
65 70 dB
Power Supply Rejection Ratio DC, T
A
= 25˚C 65 100 dB
Output Current Source V
IN(+)
=1V
DC
,V
IN(−)
=0V
DC
,
V
+
=15V
DC
,V
o
=2V
DC
,T
A
= 25˚C 20 40 mA
Output Current Sink V
IN(−)
=1V
DC
,V
IN(+)
=0V
DC
,
V
+
=15V
DC
,V
o
=2V
DC
,T
A
= 25˚C
10 20 mA
V
IN(−)
=1V
DC
,V
IN(+)
=0V
DC
,
V
+
=15V
DC
,V
o
=200 mV, T
A
= 25˚C
12 50 µA
Input Offset Voltage Drift R
S
=0Ω7 µV/˚C
Input Offset Current Drift R
S
=0Ω10 pA
DC
/˚C
COMPARATOR ONLY
Voltage Gain R
L
≥15 kΩ,V
+
=15V
DC
,T
A
= 25˚C 50 200 V/mV
Large Signal Response Time V
IN
= TTL Logic Swing, V
REF
= 1.4 V
DC
V
RL
=5V
DC
,R
L
= 5.1 kΩ,T
A
= 25˚C
300 ns
Response Time V
RL
=5V
DC
,R
L
= 5.1 kΩ,T
A
= 25˚C 1.3 µs
Output Sink Current V
IN(−)
=1 V
DC
,V
IN(+)
=0V
DC
,
V
O
≥1.5 V
DC
,T
A
= 25˚C
616 mA
Saturation Voltage V
IN(−)
≥1V
DC
,V
IN(+)
=0,
I
SINK
≤4 mA, T
A
= 25˚C
250 400 mV
V
IN(−)
≥1V
DC
,V
IN(+)
=0,
I
SINK
≤4mA
700 mV
Output Leakage Current V
IN(−)
=0,V
IN(+)
≥1V
DC
,
V
o
=5V
DC
,T
A
= 25˚C
0.1 nA
V
IN(−)
=0,V
IN(+)
≥1V
DC
,
V
o
=30V
DC
1.0 µA
Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits.
Note 2: For operating at temperatures above 25˚C, the LM392 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 amplifiers — use external
resistors, where possible, to allow the amplifier to saturate or to reduce the power which is dissipated in the integrated circuit.
Note 3: Short circuits from the output to V+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+. At values of supply voltage in excess of 15V,
continuous short circuits can exceed the power dissipation ratings and cause eventual destruction.
Note 4: 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+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 −0.3V (at 25˚C).
Note 5: These specifications apply for V+= 5V, unless otherwise stated. For the LM392, temperature specifications are limited to 0˚C ≤TA≤+70˚C.
Note 6: At output switch point, VO.1.4V, RS=0Ωwith V+from 5V to 30V; and over the full input common-mode range (0V to V+− 1.5V).
Note 7: 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 outputso
no loading change exists on the input lines.
Note 8: 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+− 1.5V, but either or both inputs can go to 32V without damage.
Note 9: 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 coupling increases at higher frequencies.
Note 10: 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 −0.3V (or 0.3V below the magnitude of the negative power supply, if used) on either amplifier.
Note 11: The response time specified is for a 100 mV input step with 5 mV overdrive. For larger overdrive signals 300 ns can be obtained.
LM392
www.national.com3
Schematic Diagram
00779302
Application Hints
Please refer to the application hints section of the LM193
and the LM158 datasheets.
LM392
www.national.com 4
Physical Dimensions inches (millimeters)
unless otherwise noted
S.O. Package (M)
Order Number LM392M or LM392MX
NS Package Number M08A
Molded Dual-In-Line Package (N)
Order Number LM392N
NS Package Number N08E
LM392
www.national.com5
Notes
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LM392 Low Power Operational Amplifier/Voltage Comparator
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
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