LMC6042
CMOS Dual Micropower Operational Amplifier
General Description
Ultra-low power consumption and low input-leakage current
are the hallmarks of the LMC6042. Providing input currents
of only 2 fA typical, the LMC6042 can operate from a single
supply, has output swing extending to each supply rail, and
an input voltage range that includes ground.
The LMC6042 is ideal for use in systems requiring ultra-low
power consumption. In addition, the insensitivity to latch-up,
high output drive, and output swing to ground without requir-
ing
external
pull-down
resistors
make
it
ideal
for
single-supply battery-powered systems.
Other applications for the LMC6042 include bar code reader
amplifiers, magnetic and electric field detectors, and
hand-held electrometers.
This device is built with National's advanced Double-Poly
Silicon-Gate CMOS process.
See the LMC6041 for a single, and the LMC6044 for a quad
amplifier with these features.
Features
n
Low supply current:
10 A/Amp (typ)
n
Operates from 4.5V to 15V single supply
n
Ultra low input current:
2 fA (typ)
n
Rail-to-rail output swing
n
Input common-mode range includes ground
Applications
n
Battery monitoring and power conditioning
n
Photodiode and infrared detector preamplifier
n
Silicon based transducer systems
n
Hand-held analytic instruments
n
pH probe buffer amplifier
n
Fire and smoke detection systems
n
Charge amplifier for piezoelectric transducers
Connection Diagram
8-Pin DIP/SO
DS011137-1
Low-Power Two-Op-Amp Instrumental Amplifier
DS011137-13
August 2000
LMC6042
CMOS
Dual
Micropower
Operational
Amplifier
2000 National Semiconductor Corporation
DS011137
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.
Differential Input Voltage
Supply Voltage
Supply Voltage (V
+
- V
-
)
16V
Output Short Circuit to V
+
(Note 12)
Output Short Circuit to V
-
(Note 2)
Lead Temperature
(Soldering, 10 seconds)
260C
Current at Input Pin
5 mA
Current at Output Pin
18 mA
Current at Power Supply Pin
35 mA
Power Dissipation
(Note 3)
Storage Temperature Range
-65C to +150C
Junction Temperature (Note 3)
110C
ESD Tolerance (Note 4)
500V
Voltage at Input/Output Pin
(V
+
) + 0.3V, (V
-
) - 0.3V
Operating Ratings
Temperature Range
LMC6042AI, LMC6042I
-40C
T
J
+85C
Supply Voltage
4.5V
V
+
15.5V
Power Dissipation
(Note 10)
Thermal Resistance (
JA
), (Note 11)
8-Pin DIP
101C/W
8-Pin SO
165C/W
Electrical Characteristics
Unless otherwise spec ified, all limits guaranteed for T
A
= T
J
= 25C. Boldface limits apply at the temperature extremes. V
+
=
5V, V
-
= 0V, V
CM
= 1.5V, V
O
= V
+
/2 and R
L
>
1M unless otherwise specified.
Typical
LMC6042AI
LMC6042I
Units
Symbol
Parameter
Conditions
(Note 5)
Limit
Limit
(Limit)
(Note 6)
(Note 6)
V
OS
Input Offset Voltage
1
3
6
mV
3.3
6.3
Max
TCV
OS
Input Offset Voltage
1.3
V/C
Average Drift
I
B
Input Bias Current
0.002
4
4
pA (Max)
I
OS
Input Offset Current
0.001
2
2
pA (Max)
R
IN
Input Resistance
>
10
Tera
CMRR
Common Mode
0V
V
CM
12.0V
75
68
62
dB
Rejection Ratio
V
+
= 15V
66
60
Min
+PSRR
Positive Power Supply
5V
V
+
15V
75
68
62
dB
Rejection Ratio
V
O
= 2.5V
66
60
Min
-PSRR
Negative Power Supply
0V
V
-
-10V
94
84
74
dB
Rejection Ratio
V
O
= 2.5V
83
73
Min
CMR
Input Common-Mode
V
+
= 5V and 15V
-0.4
-0.1
-0.1
V
Voltage Range
For CMRR
50 dB
0
0
Max
V
+
-1.9V
V
+
- 2.3V
V
+
- 2.3V
V
V
+
- 2.5V
V
+
- 2.4V
Min
A
V
Large Signal
R
L
= 100 k
(Note 7)
Sourcing
1000
400
300
V/mV
Voltage Gain
300
200
Min
Sinking
500
180
90
V/mV
120
70
Min
R
L
= 25 k
(Note 7)
Sourcing
1000
200
100
V/mV
160
80
Min
Sinking
250
100
50
V/mV
60
40
Min
LMC6042
www.national.com
2
Electrical Characteristics
(Continued)
Unless otherwise spec ified, all limits guaranteed for T
A
= T
J
= 25C. Boldface limits apply at the temperature extremes. V
+
=
5V, V
-
= 0V, V
CM
= 1.5V, V
O
= V
+
/2 and R
L
>
1M unless otherwise specified.
Typical
LMC6042AI
LMC6042I
Units
Symbol
Parameter
Conditions
(Note 5)
Limit
Limit
(Limit)
(Note 6)
(Note 6)
V
O
Output Swing
V
+
= 5V
4.987
4.970
4.940
V
R
L
= 100 k
to V
+
/2
4.950
4.910
Min
0.004
0.030
0.060
V
0.050
0.090
Max
V
+
= 5V
4.980
4.920
4.870
V
R
L
= 25 k
to V
+
/2
4.870
4.820
Min
0.010
0.080
0.130
V
0.130
0.180
Max
V
+
= 15V
14.970
14.920
14.880
V
R
L
= 100 k
to V
+
/2
14.880
14.820
Min
0.007
0.030
0.060
V
0.050
0.090
Max
V
+
= 15V
14.950
14.900
14.850
V
R
L
= 25 k
to V
+
/2
14.850
14.800
Min
0.022
0.100
0.150
V
0.150
0.200
Max
I
SC
Output Current
Sourcing, V
O
= 0V
22
16
13
mA
V
+
= 5V
10
8
Min
Sinking, V
O
= 5V
21
16
13
mA
8
8
Min
I
SC
Output Current
Sourcing, V
O
= 0V
40
15
15
mA
V
+
= 15V
10
10
Min
Sinking, V
O
= 13V
39
24
21
mA
(Note 12)
8
8
Min
I
S
Supply Current
Both Amplifiers
20
34
45
A
V
O
= 1.5V
39
50
Max
Both Amplifiers
26
44
56
A
V
+
= 15V
51
65
Max
AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
A
= T
J
= 25C. Boldface limits apply at the temperature extremes. V
+
=
5V, V
-
= 0V, V
CM
= 1.5V, V
O
= V
+
/2 and R
L
>
1M unless otherwise specified.
Typ
LMC6042AI
LMC6042I
Units
Symbol
Parameter
Conditions
(Note 5)
Limit
Limit
(Limit)
(Note 6)
(Note 6)
SR
Slew Rate
(Note 8)
0.02
0.015
0.010
V/s
0.010
0.007
Min
GBW
Gain-Bandwidth Product
100
kHz
m
Phase Margin
60
Deg
Amp-to-Amp Isolation
(Note 9)
115
dB
e
n
Input-Referred
Voltage Noise
f = 1 kHz
83
i
n
Input-Referred
Current Noise
f = 1 kHz
0.0002
LMC6042
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3
AC Electrical Characteristics
(Continued)
Unless otherwise specified, all limits guaranteed for T
A
= T
J
= 25C. Boldface limits apply at the temperature extremes. V
+
=
5V, V
-
= 0V, V
CM
= 1.5V, V
O
= V
+
/2 and R
L
>
1M unless otherwise specified.
Typ
LMC6042AI
LMC6042I
Units
Symbol
Parameter
Conditions
(Note 5)
Limit
Limit
(Limit)
(Note 6)
(Note 6)
T.H.D.
Total Harmonic Distortion
f = 1 kHz, A
V
= -5
R
L
= 100 k
, V
O
= 2 V
PP
0.01
%
5V Supply
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Conditions indicate conditions for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The
guaranteed specifications apply only for the test conditions listed.
Note 2: Applies to both single-supply operation. Continuous short circuit operation at elevated ambient temperature can result in exceeding the maximum allowed
junction temperature of 110C. Output currents in excess of
30 mA over long term may adversely affect reliability.
Note 3: 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
.
Note 4: Human body model, 1.5 k
in series with 100 pF.
Note 5: Typical values represent the most likely parametric norm.
Note 6: All limits are guaranteed at room temperature (standard type face) or at operating temperature extremes (bold face type).
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, 2.5V
V
O
7.5V.
Note 8: V
+
= 15V. Connected as Voltage Follower with 10V step input. Number specified is the slower of the positive and negative slew rates.
Note 9: Input referred V
+
= 15V and R
L
= 100 k
connected to V
+
/2. Each amp excited in turn with 100 Hz to produce V
O
= 12 V
PP
.
Note 10: For operating at elevated temperatures the device must be derated based on the thermal resistance
JA
with P
D
= (T
J
- T
A
)/
JA
.
Note 11: All numbers apply for packages soldered directly into a PC board.
Note 12: Do not connect output to V
+
when V
+
is greater than 13V or reliability may be adversely affected.
Typical Performance Characteristics
V
S
=
7.5V, T
A
= 25C unless otherwise specified
Supply Current vs
Supply Voltage
DS011137-19
Offset Voltage vs
Temperature of Five
Representative Units
DS011137-20
Input Bias Current
vs Temperature
DS011137-21
Input Bias Current
vs Input Common-Mode
Voltage
DS011137-22
Input Bias Current
Voltage Range
vs Temperature
DS011137-23
Output Characteristics
Current Sinking
DS011137-24
LMC6042
www.national.com
4
Typical Performance Characteristics
V
S
=
7.5V, T
A
= 25C unless otherwise specified (Continued)
Output Characteristics
Current Sourcing
DS011137-25
Input Voltage Noise
vs Frequency
DS011137-26
Crosstalk Rejection
vs Frequency
DS011137-27
CMRR vs Frequency
DS011137-28
CMRR vs Temperature
DS011137-29
Power Supply Rejection
Ratio vs Frequency
DS011137-30
Open-Loop Voltage
Gain vs Temperature
DS011137-31
Open-Loop
Frequency Response
DS011137-32
Gain and Phase
Responses vs
Load Capacitance
DS011137-33
LMC6042
www.national.com
5
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