LMC 6041
LMC 6041
1FEATURES DESCRIPTION
•
2 Low Supply Current: 14 μA (Typ) Ultra-low power consumption and low input-leakage
current are the hallmarks of the LMC6041. Providing
• Operates from 4.5V to 15.5V Single Supply input currents of only 2 fA typical, the LMC6041 can
• Ultra Low Input Current: 2 fA (Typ) operate from a single supply, has output swing
• Rail-to-Rail Output Swing extending to each supply rail, and an input voltage
range that includes ground.
• Input Common-Mode Range Includes Ground
The LMC6041 is ideal for use in systems requiring
APPLICATIONS ultra-low power consumption. In addition, the
insensitivity to latch-up, high output drive, and output
• Battery Monitoring and Power Conditioning swing to ground without requiring external pull-down
• Photodiode and Infrared Detector Preamplifier resistors make it ideal for single-supply battery-
• Silicon Based Transducer Systems powered systems.
• Hand-Held Analytic Instruments Other applications for the LMC6041 include bar code
• pH Probe Buffer Amplifier reader amplifiers, magnetic and electric field
detectors, and hand-held electrometers.
• Fire and Smoke Detection Systems
• Charge Amplifier for Piezoelectric Transducers This device is built with TI's advanced Double-Poly
Silicon-Gate CMOS process.
See the LMC6042 for a dual, and the LMC6044 for a
quad amplifier with these features.
Connection Diagrams
Top View
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2 All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Copyright © 1994–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
LMC6041
SNOS610E – DECEMBER 1994 – REVISED MARCH 2013 www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
(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 ensure specific performance limits. For ensured specifications and test
conditions, see the Electrical Characteristics. The ensured specifications apply only for the test conditions listed.
(2) If Military/Aerospace specified devices are required, please contact the TI Sales Office/ Distributors for availability and specifications.
(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 110°C. Output currents in excess of ±30 mA over long term may adversely
affect reliability.
(4) Do not connect output to V+ when V+ is greater than 13V or reliability may be adversely affected.
(5) Human body model, 1.5 kΩ in series with 100 pF.
(6) The maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any ambient
temperature is PD = (TJ(max) − TA)/θJA.
Operating Ratings
Temperature Range LMC6041AI, LMC6041I −40°C ≤ TJ ≤ +85°C
Supply Voltage 4.5V ≤ V+ ≤ 15.5V
Power Dissipation See (1)
(2)
Thermal Resistance (θJA) 8-Pin PDIP package 101°C/W
8-Pin SOIC package 165°C/W
(1) For operating at elevated temperatures the device must be derated based on the thermal resistance θJA with PD = (TJ − TA)/θJA.
(2) All numbers apply for packages soldered directly into a PC board.
Electrical Characteristics
Unless otherwise specified, all limits ensured for TA = TJ = 25°C. Boldface limits apply at the temperature extremes. V+ = 5V,
V− = 0V, VCM = 1.5V, VO = V+/2, and RL > 1M unless otherwise specified.
LMC6041AI LMC6041I Units
Parameter Test Conditions Typical (1)
Limit (2) Limit (2) (Limit)
VOS Input Offset Voltage 1 3 6 mV
3.3 6.3 max
TCVOS Input Offset Voltage
1.3 μV/°C
Average Drift
IB Input Bias Current 0.002 pA
4 4
max
IOS Input Offset Current 0.001 pA
2 2
max
RIN Input Resistance >10 TeraΩ
CMRR Common Mode Rejection 0V ≤ VCM ≤ 12.0V 75 68 62 dB
Ratio V+ = 15V
66 60 min
+PSRR Positive Power Supply 5V ≤ V+ ≤ 15V 75 68 62 dB
Rejection Ratio VO = 2.5V
66 60 min
−PSRR Negative Power Supply 0V ≤ V− ≤ −10V 94 84 74 dB
Rejection Ratio VO = 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
AV Large Signal Voltage Gain RL = 100 kΩ (3) Sourcing 1000 400 300 V/mV
300 200 min
Sinking 500 180 90 V/mV
120 70 min
RL = 25 kΩ (3) Sourcing 1000 200 100 V/mV
160 80 min
Sinking 250 100 50 V/mV
60 40 min
VO Output Swing V+ = 5V 4.987 4.970 4.940 V
RL = 100 kΩ 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
RL = 25 kΩ 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
RL = 100 kΩ 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
RL = 25 kΩ to V+/2
14.850 14.800 min
0.022 0.100 0.150 V
0.150 0.200 max
(4) Do not connect output to V+ when V+ is greater than 13V or reliability may be adversely affected.
AC Electrical Characteristics
Unless otherwise specified, all limits ensured for TA = TJ = 25°C. Boldface limits apply at the temperature extremes. V+ = 5V,
V− = 0V, VCM = 1.5V, VO = V+/2, and RL > 1M unless otherwise specified.
LMC6041AI LMC6041I Units
Parameter Test Conditions Typ (1)
Limit (2)
Limit (2) (Limit)
SR Slew Rate See (3) 0.02 0.015 0.010 V/μs
0.010 0.007 min
GBW Gain-Bandwidth Product 75 kHz
φm Phase Margin 60 Deg
en Input-Referred Voltage Noise F = 1 kHz 83 nV/√Hz
in Input-Referred Current Noise F = 1 kHz 0.0002 pA/√Hz
THD Total Harmonic Distortion F = 1 kHz, AV = −5 0.01 %
RL = 100 kΩ, VO = 2 Vpp
±5V Supply
Figure 3. Figure 4.
Figure 5. Figure 6.
Figure 7. Figure 8.
Stability
Inverting Small Signal vs
Pulse Response Capacitive Load (AV = +1)
Figure 27.
APPLICATIONS HINTS
AMPLIFIER TOPOLOGY
The LMC6041 incorporates a novel op-amp design topology that enables it to maintain rail-to-rail output swing
even when driving a large load. Instead of relying on a push-pull unity gain output buffer stage, the output stage
is taken directly from the internal integrator, which provides both low output impedance and large gain. Special
feed-forward compensation design techniques are incorporated to maintain stability over a wider range of
operating conditions than traditional micropower op-amps. These features make the LMC6041 both easier to
design with, and provide higher speed than products typically found in this ultra-low power class.
The effect of input capacitance can be compensated for by adding a capacitor. Adding a capacitor, Cf, around
the feedback resistor (as in Figure 28 ) such that:
(1)
or
R1 CIN ≤ R2 Cf (2)
Since it is often difficult to know the exact value of CIN, Cf can be experimentally adjusted so that the desired
pulse response is achieved. Refer to the LMC660 and the LMC662 for a more detailed discussion on
compensating for input capacitance.
Figure 29. LMC6041 Noninverting Gain of 10 Amplifier, Compensated to Handle Capacitive Loads
In the circuit of Figure 29, R1 and C1 serve to counteract the loss of phase margin by feeding the high frequency
component of the output signal back to the amplifier's inverting input, thereby preserving phase margin in the
overall feedback loop.
Capacitive load driving capability is enhanced by using a pull up resistor to V+ (Figure 30 ). Typically a pull up
resistor conducting 10 μA or more will significantly improve capacitive load responses. The value of the pull up
resistor must be determined based on the current sinking capability of the amplifier with respect to the desired
output swing. Open loop gain of the amplifier can also be affected by the pull up resistor (see Electrical
Characteristics).
PRINTED-CIRCUIT-BOARD LAYOUT
FOR HIGH-IMPEDANCE WORK
It is generally recognized that any circuit which must operate with less than 1000 pA of leakage current requires
special layout of the PC board. When one wishes to take advantage of the ultra-low bias current of the
LMC6041, typically less than 2fA, it is essential to have an excellent layout. Fortunately, the techniques of
obtaining low leakages are quite simple. First, the user must not ignore the surface leakage of the PC board,
even though it may sometimes appear acceptably low, because under conditions of high humidity or dust or
contamination, the surface leakage will be appreciable.
To minimize the effect of any surface leakage, lay out a ring of foil completely surrounding the LMC6041's inputs
and the terminals of capacitors, diodes, conductors, resistors, relay terminals, etc. connected to the op-amp's
inputs, as in Figure 31. To have a significant effect, guard rings should be placed on both the top and bottom of
the PC board. This PC foil must then be connected to a voltage which is at the same voltage as the amplifer
inputs, since no leakage current can flow between two points at the same potential. For example, a PC board
trace-to-pad resistance of 1012Ω, which is normally considered a very large resistance, could leak 5 pA if the
trace were a 5V bus adjacent to the pad of the input. This would cause a 100 times degradation from the
LMC6041's actual performance. However, if a guard ring is held within 5 mV of the inputs, then even a
resistance of 1011Ω would cause only 0.05 pA of leakage current. See Figure 34 for typical connections of guard
rings for standard op-amp configurations.
Non-Inverting Amplifier
The designer should be aware that when it is inappropriate to lay out a PC board for the sake of just a few
circuits, there is another technique which is even better than a guard ring on a PC board: Don't insert the
amplifier's input pin into the board at all, but bend it up in the air and use only air as an insulator. Air is an
excellent insulator. In this case you may have to forego some of the advantages of PC board construction, but
the advantages are sometimes well worth the effort of using point-to-point up-in-the-air wiring. See Figure 35.
(Input pins are lifted out of PC board and soldered directly to components. All other pins connected to PC board.)
The circuit in Figure 36 is recommended for applications where the common-mode input range is relatively low
and the differential gain will be in the range of 10 to 1000. This two op-amp instrumentation amplifier features an
independent adjustment of the gain and common-mode rejection trim, and a total quiescent supply current of less
than 28 μA. To maintain ultra-high input impedance, it is advisable to use ground rings and consider PC board
layout an important part of the overall system design (see Printed-Circuit-Board Layout for High Impedance
Work). Referring to Figure 36, the input voltages are represented as a common-mode input VCM plus a
differential input VD.
Rejection of the common-mode component of the input is accomplished by making the ratio of R1/R2 equal to
R3/R4. So that where,
(3)
A suggested design guideline is to minimize the difference of value between R1 through R4. This will often result
in improved resistor tempco, amplifier gain, and CMRR over temperature. If RN = R1 = R2 = R3 = R4 then the
gain equation can be simplified:
(4)
Due to the “zero-in, zero-out” performance of the LMC6041, and output swing rail-rail, the dynamic range is only
limited to the input common-mode range of 0V to VS–2.3V, worst case at room temperature. This feature of the
LMC6041 makes it an ideal choice for low-power instrumentation systems.
A complete instrumentation amplifier designed for a gain of 100 is shown in Figure 37. Provisions have been
made for low sensitivity trimming of CMRR and gain.
REVISION HISTORY
www.ti.com 25-Jun-2022
PACKAGING INFORMATION
Orderable Device Status Package Type Package Pins Package Eco Plan Lead finish/ MSL Peak Temp Op Temp (°C) Device Marking Samples
(1) Drawing Qty (2) Ball material (3) (4/5)
(6)
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based
flame retardants must also meet the <=1000ppm threshold requirement.
(3)
MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4)
There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5)
Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com 25-Jun-2022
(6)
Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two
lines if the finish value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
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Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
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Pack Materials-Page 2
PACKAGE MATERIALS INFORMATION
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TUBE
Pack Materials-Page 3
PACKAGE OUTLINE
D0008A SCALE 2.800
SOIC - 1.75 mm max height
SMALL OUTLINE INTEGRATED CIRCUIT
SEATING PLANE
.228-.244 TYP
[5.80-6.19]
.004 [0.1] C
A PIN 1 ID AREA
6X .050
[1.27]
8
1
.189-.197 2X
[4.81-5.00] .150
NOTE 3 [3.81]
4X (0 -15 )
4
5
8X .012-.020
B .150-.157 [0.31-0.51]
.069 MAX
[3.81-3.98] .010 [0.25] C A B [1.75]
NOTE 4
.005-.010 TYP
[0.13-0.25]
4X (0 -15 )
SEE DETAIL A
.010
[0.25]
.004-.010
0 -8 [0.11-0.25]
.016-.050
[0.41-1.27] DETAIL A
(.041) TYPICAL
[1.04]
4214825/C 02/2019
NOTES:
1. Linear dimensions are in inches [millimeters]. Dimensions in parenthesis are for reference only. Controlling dimensions are in inches.
Dimensioning and tolerancing per ASME Y14.5M.
2. This drawing is subject to change without notice.
3. This dimension does not include mold flash, protrusions, or gate burrs. Mold flash, protrusions, or gate burrs shall not
exceed .006 [0.15] per side.
4. This dimension does not include interlead flash.
5. Reference JEDEC registration MS-012, variation AA.
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EXAMPLE BOARD LAYOUT
D0008A SOIC - 1.75 mm max height
SMALL OUTLINE INTEGRATED CIRCUIT
8X (.061 )
[1.55]
SYMM SEE
DETAILS
1
8
8X (.024)
[0.6] SYMM
(R.002 ) TYP
[0.05]
5
4
6X (.050 )
[1.27]
(.213)
[5.4]
EXPOSED
METAL EXPOSED
METAL
.0028 MAX .0028 MIN
[0.07] [0.07]
ALL AROUND ALL AROUND
4214825/C 02/2019
NOTES: (continued)
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EXAMPLE STENCIL DESIGN
D0008A SOIC - 1.75 mm max height
SMALL OUTLINE INTEGRATED CIRCUIT
8X (.061 )
[1.55] SYMM
1
8
8X (.024)
[0.6] SYMM
(R.002 ) TYP
5 [0.05]
4
6X (.050 )
[1.27]
(.213)
[5.4]
4214825/C 02/2019
NOTES: (continued)
8. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate
design recommendations.
9. Board assembly site may have different recommendations for stencil design.
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