LMC6492 Dual/LMC6494 Quad
CMOS Rail-to-Rail Input and Output Operational
Amplifier
General Description
The LMC6492/LMC6494 amplifiers were specifically devel-
oped for single supply applications that operate from -40C
to +125C. This feature is well-suited for automotive systems
because of the wide temperature range. A unique design to-
pology enables the LMC6492/LMC6494 common-mode volt-
age range to accommodate input signals beyond the rails.
This eliminates non-linear output errors due to input signals
exceeding a traditionally limited common-mode voltage
range. The LMC6492/LMC6494 signal range has a high
CMRR of 82 dB for excellent accuracy in non-inverting circuit
configurations.
The LMC6492/LMC6494 rail-to-rail input is complemented
by rail-to-rail output swing. This assures maximum dynamic
signal range which is particularly important in 5V systems.
Ultra-low input current of 150 fA and 120 dB open loop gain
provide high accuracy and direct interfacing with high imped-
ance sources.
Features
(Typical unless otherwise noted)
n
Rail-to-Rail input common-mode voltage range,
guaranteed over temperature
n
Rail-to-Rail output swing within 20 mV of supply rail,
100 k
load
n
Operates from 5V to 15V supply
n
Excellent CMRR and PSRR
82 dB
n
Ultra low input current
150 fA
n
High voltage gain (R
L
= 100 k
)
120 dB
n
Low supply current (
@
V
S
= 5V) 500 A/Amplifier
n
Low offset voltage drift
1.0 V/C
Applications
n
Automotive transducer amplifier
n
Pressure sensor
n
Oxygen sensor
n
Temperature sensor
n
Speed sensor
Connection Diagrams
8-Pin DIP/SO
DS012049-1
Top View
14-Pin DIP/SO
DS012049-2
Top View
October 1994
LMC6492
Dual/LMC6494
Quad
CMOS
Rail-to-Rail
Input
and
Output
Operational
Amplifier
1999 National Semiconductor Corporation
DS012049
www.national.com
Ordering Information
Package
Temperature Range
Transport
Media
NSC
Drawing
Extended -40C to +125C
8-Pin Small Outline
LMC6492AEM
Rails
M08A
LMC6492BEM
LMC6492AEMX
Tape and Reel
LMC6492BEMX
8-Pin Molded DIP
LMC6492AEN
Rails
N08A
LMC6492BEN
14-Pin Small Outline
LMC6494AEM
Rails
M14A
LMC6494BEM
LMC6494AEMX
Tape and Reel
LMC6494BEMX
14-Pin Molded DIP
LMC6494AEN
Rails
N14A
LMC6494BEN
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2
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
ESD Tolerance (Note 2)
2000V
Differential Input Voltage
Supply Voltage
Voltage at Input/Output Pin
(V
+
) + 0.3V, (V
-
) - 0.3V
Supply Voltage (V
+
- V
-
)
16V
Current at Input Pin
5 mA
Current at Output Pin (Note 3)
30 mA
Current at Power Supply Pin
40 mA
Lead Temp. (Soldering, 10 sec.)
260C
Storage Temperature Range
-65C to +150C
Junction Temperature (Note 4)
150C
Operating Conditions
(Note 1)
Supply Voltage
2.5V
V
+
15.5V
Junction Temperature Range
LMC6492AE, LMC6492BE
-40C
T
J
+125C
LMC6494AE, LMC6494BE
-40C
T
J
+125C
Thermal Resistance (
JA
)
N Package, 8-Pin Molded DIP
108C/W
M Package, 8-Pin Surface Mount
171C/W
N Package, 14-Pin Molded DIP
78C/W
M Package, 14-Pin Surface Mount
118C/W
DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25C, V
+
= 5V, V
-
= 0V, V
CM
= V
O
= V
+
/2 and R
L
>
1 M
. Bold-
face limits apply at the temperature extremes
LMC6492AE
LMC6492BE
Symbol
Parameter
Conditions
Typ
LMC6494AE
LMC6494BE
Units
(Note 5)
Limit
Limit
(Note 6)
(Note 6)
V
OS
Input Offset Voltage
0.11
3.0
6.0
mV
3.8
6.8
max
TCV
OS
Input Offset Voltage
1.0
V/C
Average Drift
I
B
Input Bias Current
(Note 11)
0.15
200
200
pA max
I
OS
Input Offset Current
(Note 11)
0.075
100
100
pA max
R
IN
Input Resistance
>
10
Tera
C
IN
Common-Mode
3
pF
Input Capacitance
CMRR
Common-Mode
0V
V
CM
15V
82
65
63
dB
min
Rejection Ratio
V
+
= 15V
60
58
0V
V
CM
5V
82
65
63
60
58
+PSRR
Positive Power Supply
5V
V
+
15V,
82
65
63
dB
Rejection Ratio
V
O
= 2.5V
60
58
min
-PSRR
Negative Power Supply
0V
V
-
-10V,
82
65
63
dB
Rejection Ratio
V
O
= 2.5V
60
58
min
V
CM
Input Common-Mode
V
+
= 5V and 15V
V
-
-0.3
-0.25
-0.25
V
Voltage Range
For CMRR
50 dB
0
0
max
V
+
+ 0.3
V
+
+ 0.25
V
+
+ 0.25
V
V
+
V
+
min
A
V
Large Signal Voltage Gain
R
L
= 2 k
:
Sourcing
300
V/mV
(Note 7)
Sinking
40
min
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3
DC Electrical Characteristics
(Continued)
Unless otherwise specified, all limits guaranteed for T
J
= 25C, V
+
= 5V, V
-
= 0V, V
CM
= V
O
= V
+
/2 and R
L
>
1 M
. Bold-
face limits apply at the temperature extremes
LMC6492AE
LMC6492BE
Symbol
Parameter
Conditions
Typ
LMC6494AE
LMC6494BE
Units
(Note 5)
Limit
Limit
(Note 6)
(Note 6)
V
O
Output Swing
V
+
= 5V
4.9
4.8
4.8
V
R
L
= 2 k
to V
+
/2
4.7
4.7
min
0.1
0.18
0.18
V
0.24
0.24
max
V
+
= 5V
4.7
4.5
4.5
V
R
L
= 600
to V
+
/2
4.24
4.24
min
0.3
0.5
0.5
V
0.65
0.65
max
V
+
= 15V
14.7
14.4
14.4
V
R
L
= 2 k
to V
+
/2
14.0
14.0
min
0.16
0.35
0.35
V
0.5
0.5
max
V
+
= 15V
14.1
13.4
13.4
V
R
L
= 600
to V
+
/2
13.0
13.0
min
0.5
1.0
1.0
V
1.5
1.5
max
I
SC
Output Short Circuit Current
Sourcing, V
O
= 0V
25
16
16
mA
min
10
10
V
+
= 5V
Sinking, V
O
= 5V
22
11
11
8
8
I
SC
Output Short Circuit Current
Sourcing, V
O
= 0V
30
28
28
20
20
V
+
= 15V
Sinking, V
O
= 5V
(Note 8)
30
30
30
22
22
I
S
Supply Current
LMC6492
1.0
1.75
1.75
mA
V
+
= +5V, V
O
= V
+
/2
2.1
2.1
max
LMC6492
1.3
1.95
1.95
mA
V
+
= +15V, V
O
= V
+
/2
2.3
2.3
max
LMC6494
2.0
3.5
3.5
mA
V
+
= +5V, V
O
= V
+
/2
4.2
4.2
max
LMC6494
2.6
3.9
3.9
mA
V
+
= +15V, V
O
= V
+
/2
4.6
4.6
max
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4
AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25C, V
+
= 5V, V
-
= 0V, V
CM
= V
O
= V
+
/2 and R
L
>
1 M
. Bold-
face limits apply at the temperature extremes
LMC6492AE
LMC6492BE
Symbol
Parameter
Conditions
Typ
LMC6494AE
LMC6494BE
Units
(Note 5)
Limit
Limit
(Note 6)
(Note 6)
SR
Slew Rate
(Note 9)
1.3
0.7
0.7
Vs min
0.5
0.5
GBW
Gain-Bandwidth Product
V
+
= 15V
1.5
MHz
m
Phase Margin
50
Deg
G
m
Gain Margin
15
dB
Amp-to-Amp Isolation
(Note 10)
150
dB
e
n
Input-Referred
F = 1 kHz
37
Voltage Noise
V
CM
= 1V
i
n
Input-Referred
F = 1 kHz
0.06
Current Noise
T.H.D.
Total Harmonic
Distortion
F = 1 kHz, A
V
= -2
0.01
%
R
L
= 10 k
, V
O
= -4.1 V
PP
F = 10 kHz, A
V
= -2
R
L
= 10 k
, V
O
= 8.5 V
PP
0.01
V
+
= 10V
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in-
tended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.
Note 2: Human body model, 1.5 k
in series with 100 pF.
Note 3: Applies to both single-supply and split-supply operation. Continuous short operation at elevated ambient temperature can result in exceeding the maximum
allowed junction temperature at 150C. Output currents in excess of
30 mA over long term may adversely affect reliability.
Note 4: The maximum power dissipation is a function of T
J(max)
,
JA
and T
A
. The maximum allowable power dissipation at any ambient temperature is P
D
= (T
J(max)
- T
A
)/
JA
. All numbers apply for packages soldered directly into a PC board.
Note 5: Typical Values represent the most likely parametric norm.
Note 6: All limits are guaranteed by testing or statistical analysis.
Note 7: V
+
= 15V, V
CM
= 7.5V and R
L
connected to 7.5V. For Sourcing tests, 7.5V
V
O
11.5V. For Sinking tests, 3.5V
V
O
7.5V.
Note 8: Do not short circuit output to V
+
, when V
+
is greater than 13V or reliability will be adversely affected.
Note 9: V
+
= 15V. Connected as voltage follower with 10V step input. Number specified is the slower of the positive and negative slew rates.
Note 10: Input referred, V
+
= 15V and R
L
= 100 k
connected to 7.5V. Each amp excited in turn with 1 kHz to produce V
O
= 12 V
PP
.
Note 11: Guaranteed limits are dictated by tester limits and not device performance. Actual performance is reflected in the typical value.
Typical Performance Characteristics
V
S
= +15V, Single Supply, T
A
= 25C unless otherwise
specified
Supply Current vs
Supply Voltage
DS012049-25
Input Current vs
Temperature
DS012049-26
Sourcing Current vs
Output Voltage
DS012049-27
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5
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