LMC6484
CMOS Quad Rail-to-Rail Input and Output Operational
Amplifier
General Description
The LMC6484 provides a common-mode range that extends
to both supply rails. This rail-to-rail performance combined
with excellent accuracy, due to a high CMRR, makes it
unique among rail-to-rail input amplifiers.
It is ideal for systems, such as data acquisition, that require
a large input signal range. The LMC6484 is also an excellent
upgrade for circuits using limited common-mode range am-
plifiers such as the TLC274 and TLC279.
Maximum dynamic signal range is assured in low voltage
and single supply systems by the LMC6484's rail-to-rail out-
put swing. The LMC6484's rail-to-rail output swing is guaran-
teed for loads down to 600
.
Guaranteed low voltage characteristics and low power dissi-
pation make the LMC6484 especially well-suited for
battery-operated systems.
See the LMC6482 data sheet for a Dual CMOS operational
amplifier with these same features.
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
Guaranteed 3V, 5V and 15V Performance
n
Excellent CMRR and PSRR:
82 dB
n
Ultra Low Input Current:
20 fA
n
High Voltage Gain (R
L
= 500 k
):
130 dB
n
Specified for 2 k
and 600
loads
Applications
n
Data Acquisition Systems
n
Transducer Amplifiers
n
Hand-held Analytic Instruments
n
Medical Instrumentation
n
Active Filter, Peak Detector, Sample and Hold, pH
Meter, Current Source
n
Improved Replacement for TLC274, TLC279
3V Single Supply Buffer Circuit
Rail-to-Rail Input
DS011714-1
DS011714-2
Rail-to-Rail Output
DS011714-3
August 2000
LMC6484
CMOS
Quad
Rail-to-Rail
Input
and
Output
Operational
Amplifier
2000 National Semiconductor Corporation
DS011714
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.
ESD Tolerance (Note 2)
2.0 kV
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 (Note 12)
5 mA
Current at Output Pin
(Notes 3, 8)
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 Ratings
(Note 1)
Supply Voltage
3.0V
V
+
15.5V
Junction Temperature Range
LMC6484AM
-55C
T
J
+125C
LMC6484AI, LMC6484I
-40C
T
J
+85C
Thermal Resistance (
JA
)
N Package, 14-Pin Molded DIP
70C/W
M Package, 14-Pin
Surface Mount
110C/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
>
1M. Boldface
limits apply at the temperature extremes.
Typ
LMC6484AI
LMC6484I
LMC6484M
Symbol
Parameter
Conditions
(Note 5)
Limit
Limit
Limit
Units
(Note 6)
(Note 6)
(Note 6)
V
OS
Input Offset Voltage
0.110
0.750
3.0
3.0
mV
1.35
3.7
3.8
max
TCV
OS
Input Offset Voltage
1.0
V/C
Average Drift
I
B
Input Current
(Note 13)
0.02
4.0
4.0
100
pA max
I
OS
Input Offset Current
(Note 13)
0.01
2.0
2.0
50
pA max
C
IN
Common-Mode
3
pF
Input Capacitance
R
IN
Input Resistance
>
10
Tera
CMRR
Common Mode
0V
V
CM
15.0V,
82
70
65
65
dB
min
Rejection Ratio
V
+
= 15V
67
62
60
0V
V
CM
5.0V
82
70
65
65
V
+
= 5V
67
62
60
+PSRR
Positive Power Supply
5V
V
+
15V,
82
70
65
65
dB
Rejection Ratio
V
-
= 0V, V
O
= 2.5V
67
62
60
min
-PSRR
Negative Power Supply
-5V
V
-
-15V,
82
70
65
65
dB
Rejection Ratio
V
+
= 0V, V
O
= -2.5V
67
62
60
min
V
CM
Input Common-Mode
V
+
= 5V and 15V
V
-
- 0.3
-0.25
-0.25
-0.25
V
Voltage Range
For CMRR
50 dB
0
0
0
max
V
+
+ 0.3
V
+
+ 0.25
V
+
+ 0.25
V
+
+ 0.25
V
V
+
V
+
V
+
min
A
V
Large Signal
R
L
= 2k
Sourcing
666
140
120
120
V/mV
Voltage Gain
(Notes 7, 13)
84
72
60
min
Sinking
75
35
35
35
V/mV
20
20
18
min
R
L
= 600
Sourcing
300
80
50
50
V/mV
(Notes 7, 13)
48
30
25
min
Sinking
35
20
15
15
V/mV
13
10
8
min
LMC6484
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2
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
>
1M. Boldface
limits apply at the temperature extremes.
Typ
LMC6484AI
LMC6484I
LMC6484M
Symbol
Parameter
Conditions
(Note 5)
Limit
Limit
Limit
Units
(Note 6)
(Note 6)
(Note 6)
V
O
Output Swing
V
+
= 5V
4.9
4.8
4.8
4.8
V
R
L
= 2 k
to V
+
/2
4.7
4.7
4.7
min
0.1
0.18
0.18
0.18
V
0.24
0.24
0.24
max
V
+
= 5V
4.7
4.5
4.5
4.5
V
R
L
= 600
to V
+
/2
4.24
4.24
4.24
min
0.3
0.5
0.5
0.5
V
0.65
0.65
0.65
max
V
+
= 15V
14.7
14.4
14.4
14.4
V
R
L
= 2 k
to V
+
/2
14.2
14.2
14.2
min
0.16
0.32
0.32
0.32
V
0.45
0.45
0.45
max
V
+
= 15V
14.1
13.4
13.4
13.4
V
R
L
= 600
to V
+
/2
13.0
13.0
13.0
min
0.5
1.0
1.0
1.0
V
1.3
1.3
1.3
max
I
SC
Output Short Circuit
Sourcing, V
O
= 0V
20
16
16
16
mA
Current
12
12
10
min
V+ = 5V
Sinking, V
O
= 5V
15
11
11
11
mA
9.5
9.5
8.0
min
I
SC
Output Short Circuit
Sourcing, V
O
= 0V
30
28
28
28
mA
Current
22
22
20
min
V
+
= 15V
Sinking, V
O
= 12V
30
30
30
30
mA
(Note 8)
24
24
22
min
I
S
Supply Current
All Four Amplifiers
2.0
2.8
2.8
2.8
mA
V
+
= +5V, V
O
= V
+
/2
3.6
3.6
3.8
max
All Four Amplifiers
2.6
3.0
3.0
3.0
mA
V
+
= +15V, V
O
= V
+
/2
3.8
3.8
4.0
max
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
>
1M. Boldface
limits apply at the temperature extremes.
Typ
LMC6484A
LMC6484I
LMC6484M
Symbol
Parameter
Conditions
(Note 5)
Limit
Limit
Limit
Units
(Note 6)
(Note 6)
(Note 6)
SR
Slew Rate
(Note 9)
1.3
1.0
0.9
0.9
V/s
0.7
0.63
0.54
min
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
0.03
Current Noise
LMC6484
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3
AC 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
>
1M. Boldface
limits apply at the temperature extremes.
Typ
LMC6484A
LMC6484I
LMC6484M
Symbol
Parameter
Conditions
(Note 5)
Limit
Limit
Limit
Units
(Note 6)
(Note 6)
(Note 6)
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
DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25C, V
+
= 3V, V
-
= 0V, V
CM
= V
O
= V
+
/2 and R
L
>
1M
Typ
LMC6484AI
LMC6484I
LMC6484M
Symbol
Parameter
Conditions
(Note 5)
Limit
Limit
Limit
Units
(Note 6)
(Note 6)
(Note 6)
V
OS
Input Offset Voltage
0.9
2.0
3.0
3.0
mV
2.7
3.7
3.8
max
TCV
OS
Input Offset Voltage
2.0
V/C
Average Drift
I
B
Input Bias Current
0.02
pA
I
OS
Input Offset Current
0.01
pA
CMRR
Common Mode
0V
V
CM
3V
74
64
60
60
dB
Rejection Ratio
min
PSRR
Power Supply
3V
V
+
15V, V
-
= 0V
80
68
60
60
dB
Rejection Ratio
min
V
CM
Input Common-Mode
For CMRR
50 dB
V
-
- 0.25
0
0
0
V
Voltage Range
max
V
+
+ 0.25
V
+
V
+
V
+
V
min
V
O
Output Swing
R
L
= 2 k
to V
+
/2
2.8
V
0.2
V
R
L
= 600
to V
+
/2
2.7
2.5
2.5
2.5
V
min
0.37
0.6
0.6
0.6
V
max
I
S
Supply Current
All Four Amplifiers
1.65
2.5
2.5
2.5
mA
3.0
3.0
3.2
max
AC Electrical Characteristics
Unless otherwise specified, V
+
= 3V, V
-
= 0V, V
CM
= V
O
= V
+
/2 and R
L
>
1M
Typ
LMC6484AI
LMC6484I
LMC6484M
Symbol
Parameter
Conditions
(Note 5)
Limit
Limit
Limit
Units
(Note 6)
(Note 6)
(Note 6)
SR
Slew Rate
(Note 11)
0.9
V/s
GBW
Gain-Bandwidth Product
1.0
MHz
T.H.D.
Total Harmonic Distortion
f = 10 kHz, A
V
= -2
0.01
%
R
L
= 10 k
, V
O
= 2 V
PP
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. All pins rated per method 3015.6 of MIL-STD-883. This is a class 2 device rating.
LMC6484
www.national.com
4
AC Electrical Characteristics
(Continued)
Note 3: Applies to both single supply and split-supply operation. Continuous short circuit operation at elevated ambient temperature can result in exceeding the maxi-
mum allowed junction temperature of 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 either the positive or 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: Connected as Voltage Follower with 2V step input. Number specified is the slower of either the positive or negative slew rates.
Note 12: Limiting input pin current is only necessary for input voltages that exceed absolute maximum input voltage ratings.
Note 13: Guaranteed limits are dictated by tester limitations and not device performance. Actual performance is reflected in the typical value.
Note 14: For guaranteed Military Temperature Range parameters see RETSMC6484X.
Typical Performance Characteristics
V
S
= +15V, Single Supply, T
A
= 25C unless otherwise
specified
Supply Current vs
Supply Voltage
DS011714-39
Input Current vs
Temperature
DS011714-40
Sourcing Current vs
Output Voltage
DS011714-41
Sourcing Current vs
Output Voltage
DS011714-42
Sourcing Current vs
Output Voltage
DS011714-43
Sinking Current vs
Output Voltage
DS011714-44
LMC6484
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