LMC6572 Dual/LMC6574 Quad
Low Voltage (2.7V and 3V) Operational Amplifier
General Description
Low voltage operation and low power dissipation make the
LMC6574/2 ideal for battery-powered systems.
3V amplifier performance is backed by 2.7V guarantees to
ensure operation throughout battery lifetime. These guaran-
tees also enable analog circuits to operate from the same
3.3V supply used for digital logic.
Battery life is maximized because each amplifier dissipates
only micro-watts of power.
The LMC6574/2 does not sacrifice functionality for low volt-
age operation. The LMC6574/2 generates 120 dB of
open-loop gain just like a conventional amplifier, but the
LMC6574/2 can do this from a 2.7V supply.
These amplifiers are designed with features that optimize
low voltage operation. The output voltage swings rail-to-rail
to maximize signal-to-noise ratio and dynamic signal range.
The common-mode input voltage range extends from
800 mV below the positive supply to 100 mV below ground.
This device is built with National's advanced Double-Poly
Silicon-Gate CMOS process.
LMC6572 is also available in MSOP package which is al-
most half the size of a SO-8 device.
Features
(Typical unless otherwise noted)
n
Guaranteed 2.7V and 3V Performance
n
Rail-to-Rail Output Swing (within 5 mV of supply rail,
100 k
load)
n
Ultra-Low Supply Current:
40 A/Amplifier
n
Low Cost
n
Ultra-Low Input Current:
20 fA
n
High Voltage Gain
@
V
S
=2.7V, R
L
=100 k
:
120 dB
n
Specified for 100 k
and 5 k
loads
n
Available in MSOP Package
Applications
n
Transducer Amplifier
n
Portable or Remote Equipment
n
Battery-Operated Instruments
n
Data Acquisition Systems
n
Medical Instrumentation
n
Improved Replacement for TLV2322 and TLV2324
Connection Diagrams
8-Pin DIP/SO/MSOP
DS011934-1
Order Number LMC6572AIN, LMC6572BIN,
LMC6572AIM, LMC6572BIM or LMC6572BIMM
See NS Package Number N08E, M08A or MUA08A
14-Pin DIP/SO
DS011934-2
Order Number LMC6574AIN, LMC6574BIN,
LMC6574AIM or LMC6574BIM
See NS Package Number N14A or M14A
December 1996
LMC6572
Dual/LMC6574
Quad
Low
V
oltage
(2.7V
and
3V)
Operational
Amplifier
1999 National Semiconductor Corporation
DS011934
www.national.com
Ordering Information
Package
Temperature Range
NSC Drawing
Transport
Industrial, -40C to +85C
Media
8-Pin Molded DIP
LMC6572AIN, LMC6572BIN
N08E
Rail
8-Pin Small Outline
LMC6572AIM, LMC6572BIM
M08A
Rail
LMC6572AIMX, LMC6572BIMX
Tape and Reel
8-Pin Mini SO
LMC6572BIMM
MUA08A
Rail
LMC6572BIMMX
Tape and Reel
14-Pin Molded DIP
LMC6574AIN, LMC6574BIN
N14A
Rail
14-Pin Small Outline
LMC6574AIM, LMC6574BIM
M14A
Rail
LMC6574AIMX, LMC6574BIMX
Tape and Reel
www.national.com
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
-
)
12V
Current at Input Pin
5 mA
Current at Output Pin (Note 3)
10 mA
Current at Power Supply Pin
35 mA
Lead Temperature
(Soldering, 10 Seconds)
260C
Storage Temperature Range
-65C to +150C
Junction Temperature (Note 4)
150C
Operating Ratings
(Note 1)
Supply Voltage
2.7V
V
+
11V
Junction Temperature Range
LMC6572AI, LMC6572BI
-40C
T
J
+85C
LMC6574AI, LMC6574BI
-40C
T
J
+85C
Thermal Resistance (
JA
)
N Package, 8-Pin Molded DIP
115C/W
M Package, 8-Pin Surface Mount
193C/W
MSOP Package, 8-Pin Mini SO
217C/W
N Package, 14-Pin Molded DIP
81C/W
M Package, 14-Pin Surface Mount
126C/W
2.7V DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25C. V
+
= 2.7V, V
-
= 0V, V
CM
= V
O
= V
+
/2 and R
L
>
1M
. Bold-
face limits apply at the temperature extremes.
Symbol
Parameter
Conditions
Typ
(Note 5)
LMC6574AI
LMC6574BI
Units
LMC6572AI
LMC6572BI
Limit
Limit
(Note 6)
(Note 6)
V
OS
Input Offset Voltage
V
+
= 2.7V and 3V
0.5
3
7
mV
3.5
7.5
Max
TCV
OS
Input Offset Voltage
1.5
V/C
Average Drift
I
B
Input Current
0.02
pA
10
10
Max
I
OS
Input Offset Current
0.01
pA
6
6
Max
R
IN
Input Resistance
>
1
Tera
C
IN
Common-Mode
3
pF
Input Capacitance
CMRR
Common Mode
0V
V
CM
3.5V
75
63
60
dB
Rejection Ratio
V
+
= 5V
60
57
Min
+PSRR
Positive Power Supply
2.7V
V
+
5V,
75
67
60
dB
Rejection Ratio
V
-
= 0V
65
58
Min
-PSRR
Negative Power Supply
-2.7V
V
-
-5V,
83
75
67
dB
Rejection Ratio
V
+
= 0V
73
65
Min
V
CM
Input Common-Mode
V
+
= 2.7V and 3V
-0.1
-0.05
-0.05
V
Voltage Range
for CMRR
50 dB
0
0
Max
V
+
- 0.8
V
+
- 1.0
V
+
- 1.0
V
V
+
- 1.3
V
+
- 1.3
Min
A
V
Large Signal
R
L
= 100 k
Sourcing
1000
V/mV
Voltage Gain
(Note 7)
Sinking
500
V/mV
www.national.com
3
2.7V DC Electrical Characteristics
(Continued)
Unless otherwise specified, all limits guaranteed for T
J
= 25C. V
+
= 2.7V, V
-
= 0V, V
CM
= V
O
= V
+
/2 and R
L
>
1M
. Bold-
face limits apply at the temperature extremes.
Symbol
Parameter
Conditions
Typ
(Note 5)
LMC6574AI
LMC6574BI
Units
LMC6572AI
LMC6572BI
Limit
Limit
(Note 6)
(Note 6)
V
O
Output Swing
V
+
= 2.7V
2.695
2.68
2.65
V
R
L
= 100 k
to V
+
/2
2.66
2.62
Min
0.005
0.03
0.06
V
0.05
0.09
Max
V
+
= 2.7V
2.66
2.55
2.45
V
R
L
= 5 k
to V
+
/2
2.45
2.35
Min
0.04
0.15
0.25
V
0.25
0.35
Max
V
+
= 3V
2.995
2.98
2.95
V
R
L
= 100 k
to V
+
/2
2.96
2.93
Min
0.005
0.03
0.06
V
0.05
0.09
Max
V
+
= 3V
2.96
2.85
2.75
V
R
L
= 5 k
to V
+
/2
2.75
2.65
Min
0.04
0.15
0.25
V
0.25
0.35
Max
I
SC
Output Short
Sourcing, V
O
= 0V
6.0
4.0
3.0
mA
Circuit Current
3.0
2.0
Min
Sinking, V
O
= 2.7V
4.0
3.0
2.5
mA
2.0
1.5
Min
I
S
Supply Current
Quad Package
160
240
240
A
V
+
= +2.7V, V
O
= V
+
/2
280
280
Max
Quad Package
160
240
240
A
V
+
= +3V, V
O
= V
+
/2
280
280
Max
Dual Package
80
120
120
A
V
+
= +2.7V, V
O
= V
+
/2
140
140
Max
Dual Package
80
120
120
A
V
+
= +3V, V
O
= V
+
/2
140
140
Max
2.7V AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25C, V
+
= 2.7V, V
-
= 0V, V
CM
= V
O
= V
+
/2 and R
L
>
1 M
. Bold-
face limits apply at the temperature extremes.
Symbol
Parameter
Conditions
Typ
(Note 5)
LMC6574AI
LMC6574BI
Units
LMC6572AI
LMC6572BI
Limit
Limit
(Note 6)
(Note 6)
SR
Slew Rate
V
+
= 2.7V and 3V
90
30
30
V/ms
(Note 8)
10
10
Min
GBW
Gain-Bandwidth Product
V
+
= 3V
0.22
MHz
m
Phase Margin
60
Deg
G
m
Gain Margin
12
dB
Amp-to-Amp Isolation
(Note 9)
120
dB
e
n
Input-Referred
F = 1 kHz
45
nV/
Hz
Voltage Noise
V
CM
= 1V
i
n
Input-Referred
F = 1 kHz
0.002
pA/
Hz
www.national.com
4
2.7V AC Electrical Characteristics
(Continued)
Unless otherwise specified, all limits guaranteed for T
J
= 25C, V
+
= 2.7V, V
-
= 0V, V
CM
= V
O
= V
+
/2 and R
L
>
1 M
. Bold-
face limits apply at the temperature extremes.
Symbol
Parameter
Conditions
Typ
(Note 5)
LMC6574AI
LMC6574BI
Units
LMC6572AI
LMC6572BI
Limit
Limit
(Note 6)
(Note 6)
Current Noise
T.H.D.
Total Harmonic Distortion
F = 10 kHz, A
V
= -2
0.05
%
R
L
= 10 k
, V
O
= 1.0 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 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 circuit operation at elevated ambient temperature can result in exceeding the
maximum allowed junction temperature of 150C.
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
+
= 3V, V
CM
= 1.5V and R
L
connected to 1.5V. For Sourcing tests, 1.5V
V
O
2.5V. For Sinking tests, 0.5V
V
O
1.5V.
Note 8: Connected as Voltage Follower with 1.0V step input. Number specified is the slower of the positive and negative slew rates.
Note 9: Input referred, V
+
= 3V and R
L
= 100 k
connected to 1.5V. Each amp excited in turn with 1 KHz to produce V
O
= 2 V
PP
.
Typical Performance Characteristics
V
S
= +3V, T
A
= 25C, Unless otherwise specified
Supply Current vs
Supply Voltage (Dual Package)
DS011934-18
Input Current vs
Temperature
DS011934-19
Sourcing Current vs
Output Voltage
DS011934-20
Sinking Current vs
Output Voltage
DS011934-21
Output Voltage Swing vs
Supply Voltage
DS011934-22
Input Voltage Noise vs
Frequency
DS011934-23
www.national.com
5
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