LMC6001-MIL [TI]

超低输入电流放大器;
LMC6001-MIL
型号: LMC6001-MIL
厂家: TEXAS INSTRUMENTS    TEXAS INSTRUMENTS
描述:

超低输入电流放大器

放大器
文件: 总18页 (文件大小:555K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
Support &  
Community  
Product  
Folder  
Order  
Now  
Tools &  
Software  
Technical  
Documents  
LMC6001-MIL  
SNOSD60 JUNE 2017  
LMC6001-MIL Ultra, Ultra-Low Input Current Amplifier  
To avoid long turnon settling times common in other  
low input current op amps, the LMC6001A is tested  
three times in the first minute of operation. Even units  
that meet the 25-fA limit are rejected if they drift.  
1 Features  
1
(Maximum Limit, 25°C Unless Otherwise Noted)  
Input Current (100% Tested): 25 fA  
Input Current Over Temperature: 2 pA  
Low Power: 750 µA  
Because of the ultra-low input current noise of 0.13  
fA/Hz, the LMC6001-MIL can provide almost  
noiseless amplification of high resistance signal  
sources. Adding only 1 dB at 100 kΩ, 0.1 dB at 1 MΩ  
and 0.01 dB or less from 10 MΩ to 2,000 MΩ, the  
LMC6001-MIL is an almost noiseless amplifier.  
Low VOS: 350 µV  
Low Noise: 22 nV/Hz at 1 kHz Typical  
2 Applications  
The LMC6001-MIL is ideally suited for electrometer  
applications requiring ultra-low input leakage such as  
sensitive photodetection transimpedance amplifiers  
and sensor amplifiers. Because input referred noise is  
only 22 nV/Hz, the LMC6001-MIL can achieve  
higher signal to noise ratio than JFET input type  
electrometer amplifiers. Other applications of the  
LMC6001-MIL include long interval integrators, ultra-  
high input impedance instrumentation amplifiers, and  
sensitive electrical-field measurement circuits.  
Electrometer Amplifiers  
Photodiode Preamplifiers  
Ion Detectors  
A.T.E. Leakage Testing  
3 Description  
Featuring 100% tested input currents of 25 fA  
maximum, low operating power, and ESD protection  
of 2000 V, the LMC6001-MIL device achieves a new  
industry benchmark for low input current operational  
amplifiers. By tightly controlling the molding  
compound, Texas Instruments is able to offer this  
ultra-low input current in a lower cost molded  
package.  
Device Information(1)  
PART NUMBER  
PACKAGE  
PDIP (8)  
TO-99 (8)  
BODY SIZE (NOM)  
9.81 mm × 6.35 mm  
9.08 mm × 9.08 mm  
LMC6001-MIL  
(1) For all available packages, see the orderable addendum at  
the end of the data sheet.  
Simplified Schematic  
R2  
R1  
œ
VIN  
LMC6001  
VOUT  
+
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,  
intellectual property matters and other important disclaimers. PRODUCTION DATA.  
 
 
 
 
LMC6001-MIL  
SNOSD60 JUNE 2017  
www.ti.com  
Table of Contents  
1
2
3
4
5
Features.................................................................. 1  
7
Applications and Implementation ...................... 10  
7.1 Application Information............................................ 10  
7.2 Typical Application .................................................. 11  
7.3 System Example ..................................................... 13  
Power Supply Recommendations...................... 14  
Layout ................................................................... 14  
9.1 Layout Guidelines ................................................... 14  
9.2 Layout Example ...................................................... 15  
Applications ........................................................... 1  
Description ............................................................. 1  
Pin Configuration and Functions......................... 3  
Specifications......................................................... 3  
5.1 Absolute Maximum Ratings ...................................... 3  
5.2 ESD Ratings.............................................................. 4  
5.3 Recommended Operating Conditions....................... 4  
5.4 Thermal Information.................................................. 4  
5.5 DC Electrical Characteristics for LMC6001AI ........... 4  
5.6 Dissipation Ratings ................................................... 5  
5.7 Typical Characteristics.............................................. 6  
Detailed Description .............................................. 9  
6.1 Overview ................................................................... 9  
6.2 Functional Block Diagram ......................................... 9  
6.3 Feature Description................................................... 9  
6.4 Device Functional Modes.......................................... 9  
8
9
10 Device and Documentation Support ................. 16  
10.1 Documentation Support ........................................ 16  
10.2 Related Links ........................................................ 16  
10.3 Community Resources.......................................... 16  
10.4 Trademarks........................................................... 16  
10.5 Electrostatic Discharge Caution............................ 16  
10.6 Glossary................................................................ 16  
6
11 Mechanical, Packaging, and Orderable  
Information ........................................................... 16  
2
Submit Documentation Feedback  
Copyright © 2017, Texas Instruments Incorporated  
Product Folder Links: LMC6001-MIL  
LMC6001-MIL  
www.ti.com  
SNOSD60 JUNE 2017  
4 Pin Configuration and Functions  
P Package  
8-Pin PDIP  
Top View  
LMC Package  
8-Pin TO-99  
Top View  
Pin Functions  
PIN  
I/O  
DESCRIPTION  
NAME  
CAN  
+IN  
PDIP NO.  
TO-99 NO.  
8
3
I
No internal connection; connected to the external casing.  
Noninverting Input  
3
–IN  
2
2
I
Inverting Input  
NC  
1, 5, 8  
1, 5  
6
O
No connection  
OUTPUT  
V+  
6
7
4
Output  
7
Positive (higher) power supply  
Negative (lower) power supply  
V–  
4
5 Specifications  
5.1 Absolute Maximum Ratings  
Over operating free-air temperature range (unless otherwise noted)(1)(2)  
MIN  
MAX  
Unit  
Differential Input Voltage  
Voltage at Input/Output Pin  
Supply Voltage (V+ V)  
Output Short Circuit to V+  
Output Short Circuit to V−  
Lead Temperature (Soldering, 10 Sec.)  
Junction Temperature  
±Supply Voltage  
(V+) + 0.3  
(V) 0.3  
V
V
0.3  
+16  
(3)(4)  
(3)  
See  
See  
260  
150  
±10  
±30  
40  
°C  
°C  
Current at Input Pin  
mA  
mA  
mA  
°C  
Current at Output Pin  
Current at Power Supply Pin  
Storage Temperature, Tstg  
65  
150  
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings  
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended  
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.  
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments 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 150°C. Output currents in excess of ±30 mA over long term may adversely  
affect reliability.  
(4) Do not connect the output to V+, when V+ is greater than 13 V or reliability will be adversely affected.  
Copyright © 2017, Texas Instruments Incorporated  
Submit Documentation Feedback  
3
Product Folder Links: LMC6001-MIL  
LMC6001-MIL  
SNOSD60 JUNE 2017  
www.ti.com  
5.2 ESD Ratings  
VALUE  
UNIT  
V(ESD)  
Electrostatic discharge  
Human body model (HBM), per ANSI/ESDA/JEDEC JS-001(1)(2)  
±2000  
V
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.  
(2) Human body model, 1.5 kΩ in series with 100 pF.  
5.3 Recommended Operating Conditions  
Over operating free-air temperature range (unless otherwise noted).  
MIN  
MAX  
15.5  
85  
UNIT  
V
VSS  
TJ  
Supply input voltage  
4.5  
Operating junction temperature  
–40  
°C  
5.4 Thermal Information  
LMC6001-MIL  
THERMAL METRIC(1)  
P (PDIP)  
LMC (TO-99)  
UNIT  
8 PINS  
100  
8 PINS  
145  
RθJA  
Junction-to-ambient thermal resistance  
Junction-to-case (top) thermal resistance  
°C/W  
°C/W  
RθJC(top)  
45  
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application  
report, SPRA953.  
5.5 DC Electrical Characteristics for LMC6001AI  
Limits are ensured for TJ = 25°C unless otherwise specified. Unless otherwise specified, V+ = 5 V, V= 0 V, VCM = 1.5 V, and  
RL > 1 M.  
LMC6001AI  
PARAMETER  
TEST CONDITIONS  
UNIT  
MIN(1)  
TYP(2)  
MAX(1)  
25  
10  
Either Input, VCM = 0 V,  
IB  
Input Current  
VS = ±5 V  
At the temperature extremes  
2000  
fA  
5
Input Offset  
Current  
IOS  
At the temperature extremes  
1000  
0.7  
1
At the temperature extremes  
VS = ±5 V, VCM = 0 V  
Input Offset  
Voltage  
VOS  
mV  
10  
At the temperature extremes  
1.35  
Input Offset  
Voltage Drift  
TCVOS  
RIN  
2.5  
µV/°C  
Input  
Resistance  
TΩ  
>1  
83  
Common Mode 0 V VCM 7.5 V  
Rejection Ratio V+ = 10 V  
Positive Power  
Supply  
Rejection Ratio  
75  
72  
73  
CMRR  
At the temperature extremes  
At the temperature extremes  
83  
94  
+PSRR  
5 V V+ 15 V  
dB  
70  
80  
77  
Negative  
Power Supply  
Rejection Ratio  
PSRR  
0 V V≥ −10 V  
At the temperature extremes  
400  
300  
180  
100  
1400  
350  
Sourcing, RL = 2 kΩ(3)  
Sinking, RL = 2 kΩ(3)  
Large Signal  
Voltage Gain  
AV  
V/mV  
At the temperature extremes  
(1) All limits are specified by testing or statistical analysis.  
(2) Typical values represent the most likely parametric norm.  
(3) V+ = 15 V, VCM = 7.5 V and RL connected to 7.5 V. For Sourcing tests, 7.5 V VO 11.5 V. For Sinking tests, 2.5 V VO 7.5 V.  
4
Submit Documentation Feedback  
Copyright © 2017, Texas Instruments Incorporated  
Product Folder Links: LMC6001-MIL  
 
 
LMC6001-MIL  
www.ti.com  
SNOSD60 JUNE 2017  
DC Electrical Characteristics for LMC6001AI (continued)  
Limits are ensured for TJ = 25°C unless otherwise specified. Unless otherwise specified, V+ = 5 V, V= 0 V, VCM = 1.5 V, and  
RL > 1 M.  
LMC6001AI  
PARAMETER  
TEST CONDITIONS  
UNIT  
MIN(1)  
TYP(2)  
MAX(1)  
–0.4  
–0.1  
VCM Low  
At the temperature  
extremes  
0
Input Common- V+ = 5 V and 15 V For  
Mode Voltage CMRR 60 dB  
VCM  
V
V+ 2.3  
V+ 2.5  
V+ 1.9  
0.1  
VCM High  
VO Low  
At the temperature  
extremes  
0.14  
0.17  
At the temperature  
extremes  
V+ = 15 V, RL = 2 kΩ to  
2.5 V  
4.8  
4.87  
VO High  
VO Low  
VO High  
At the temperature  
extremes  
4.73  
VO  
Output Swing  
V
0.26  
0.35  
0.45  
At the temperature  
extremes  
V+ = 15 V, RL = 2 kΩ to  
7.5 V  
14.5  
14.63  
At the temperature  
extremes  
14.34  
Sourcing, V+ = 5 V,  
VO = 0 V  
16  
10  
16  
13  
28  
22  
28  
22  
22  
21  
At the temperature extremes  
At the temperature extremes  
At the temperature extremes  
At the temperature extremes  
At the temperature extremes  
At the temperature extremes  
Sinking, V+ = 5 V,  
VO = 5 V  
IO  
Output Current  
mA  
Sourcing, V+ = 15 V,  
VO = 0 V  
30  
Sinking, V+ = 15 V,  
VO = 13 V(4)  
34  
450  
550  
750  
900  
850  
950  
V+ = 5 V, VO = 1.5 V  
V+ = 15 V, VO = 7.5 V  
IS  
Supply Current  
µA  
(4) Do not connect the output to V + , when V + is greater than 13 V or reliability will be adversely affected.  
5.6 Dissipation Ratings  
MIN  
MAX  
UNIT  
(1)  
Power Dissipation  
See  
(1) For operating at elevated temperatures the device must be derated based on the thermal resistance θJA with PD = (TJ TA)/θJA  
.
Copyright © 2017, Texas Instruments Incorporated  
Submit Documentation Feedback  
5
Product Folder Links: LMC6001-MIL  
LMC6001-MIL  
SNOSD60 JUNE 2017  
www.ti.com  
5.7 Typical Characteristics  
VS = ±7.5 V, TA = 25°C, unless otherwise specified  
100 pA  
10 pA  
1 pA  
100 fA  
10 fA  
1 fA  
0
25  
50  
75  
100  
125  
TEMPERATURE (°C)  
VS = ±5 V  
Figure 2. Input Current vs. VCM  
Figure 1. Input Current vs. Temperature  
Figure 3. Supply Current vs. Supply Voltage  
Figure 4. Input Voltage vs. Output Voltage  
Figure 6. Power Supply Rejection Ratio vs. Frequency  
Figure 5. Common-Mode Rejection Ratio vs. Frequency  
6
Submit Documentation Feedback  
Copyright © 2017, Texas Instruments Incorporated  
Product Folder Links: LMC6001-MIL  
 
LMC6001-MIL  
www.ti.com  
SNOSD60 JUNE 2017  
Typical Characteristics (continued)  
VS = ±7.5 V, TA = 25°C, unless otherwise specified  
Figure 7. Input Voltage Noise vs. Frequency  
Figure 8. Noise Figure vs. Source Resistance  
Figure 9. Output Characteristics Sourcing Current  
Figure 10. Output Characteristics Sinking Current  
RL = 500 kω  
Figure 11. Gain and Phase Response vs. Temperature  
Figure 12. Gain and Phase Response vs. Capacitive Load  
(55°C to +125°C)  
Copyright © 2017, Texas Instruments Incorporated  
Submit Documentation Feedback  
7
Product Folder Links: LMC6001-MIL  
LMC6001-MIL  
SNOSD60 JUNE 2017  
www.ti.com  
Typical Characteristics (continued)  
VS = ±7.5 V, TA = 25°C, unless otherwise specified  
Figure 14. Inverting Small Signal Pulse Response  
Figure 13. Open-Loop Frequency Response  
Figure 15. Inverting Large Signal Pulse Response  
Figure 17. Noninverting Large Signal Pulse Response  
Figure 16. Noninverting Small Signal Pulse Response  
Figure 18. Stability vs. Capacitive Load  
8
Submit Documentation Feedback  
Copyright © 2017, Texas Instruments Incorporated  
Product Folder Links: LMC6001-MIL  
LMC6001-MIL  
www.ti.com  
SNOSD60 JUNE 2017  
6 Detailed Description  
6.1 Overview  
LMC6001-MIL has an extremely low input current of 25 fA. In addition, its ultra-low input current noise of 0.13  
fA/Hz allows almost noiseless amplification of high-resistance signal sources. LMC6001-MIL is ideally suited for  
electrometer applications requiring ultra-low input leakage current such as sensitive photodetection  
transimpedance amplifiers and sensor amplifiers.  
6.2 Functional Block Diagram  
6.3 Feature Description  
6.3.1 Amplifier Topology  
The LMC6001-MIL 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 op amps. These features make the LMC6001-MIL both easier to design with,  
and provide higher speed than products typically found in this low-power class.  
6.3.2 Latch-up Prevention  
CMOS devices tend to be susceptible to latch-up due to their internal parasitic SCR effects. The (I/O) input and  
output pins look similar to the gate of the SCR. There is a minimum current required to trigger the SCR gate  
lead. The LMC6001-MIL is designed to withstand 100-mA surge current on the I/O pins. Some resistive method  
should be used to isolate any capacitance from supplying excess current to the I/O pins. In addition, like an SCR,  
there is a minimum holding current for any latch-up mode. Limiting current to the supply pins will also inhibit  
latch-up susceptibility.  
6.4 Device Functional Modes  
The LMC6001-MIL has a single functional mode and operates according to the conditions listed in  
Recommended Operating Conditions.  
Copyright © 2017, Texas Instruments Incorporated  
Submit Documentation Feedback  
9
Product Folder Links: LMC6001-MIL  
LMC6001-MIL  
SNOSD60 JUNE 2017  
www.ti.com  
7 Applications and Implementation  
NOTE  
Information in the following applications sections is not part of the TI component  
specification, and TI does not warrant its accuracy or completeness. TI’s customers are  
responsible for determining suitability of components for their purposes. Customers should  
validate and test their design implementation to confirm system functionality.  
7.1 Application Information  
7.1.1 Compensating for Input Capacitance  
It is quite common to use large values of feedback resistance for amplifiers with ultra-low input current, like the  
LMC6001.  
Although the LMC6001 is highly stable over a wide range of operating conditions, certain precautions must be  
met to achieve the desired pulse response when a large feedback resistor is used. Large feedback resistors with  
even small values of input capacitance, due to transducers, photodiodes, and printed-circuit-board parasitics,  
reduce phase margins.  
When high input impedances are demanded, TI suggests guarding the LMC6001. Guarding input lines will not  
only reduce leakage, but lowers stray input capacitance as well. See Printed-Circuit-Board Layout For High-  
Impedance Work.  
The effect of input capacitance can be compensated for by adding a capacitor, Cf, around the feedback resistors  
(as in Figure 19) such that:  
(1)  
or  
R1 CIN R2 Cf  
(2)  
Because 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 (SNOSBZ3) and LMC662 (SNOSC51) for a more detailed  
discussion on compensating for input capacitance.  
Figure 19. Cancelling the Effect of Input Capacitance  
7.1.2 Capacitive Load Tolerance  
All rail-to-rail output swing operational amplifiers have voltage gain in the output stage. A compensation capacitor  
is normally included in this integrator stage. The frequency location of the dominant pole is affected by the  
resistive load on the amplifier. Capacitive load driving capability can be optimized by using an appropriate  
resistive load in parallel with the capacitive load. See Typical Characteristics.  
Direct capacitive loading will reduce the phase margin of many op amps. A pole in the feedback loop is created  
by the combination of the output impedance of the op amp and the capacitive load. This pole induces phase lag  
at the unity-gain crossover frequency of the amplifier resulting in either an oscillatory or underdamped pulse  
response. With a few external components, op amps can easily indirectly drive capacitive loads, as shown in  
Figure 20.  
10  
Submit Documentation Feedback  
Copyright © 2017, Texas Instruments Incorporated  
Product Folder Links: LMC6001-MIL  
 
LMC6001-MIL  
www.ti.com  
SNOSD60 JUNE 2017  
Application Information (continued)  
Figure 20. LMC6001 Noninverting Gain of 10 Amplifier, Compensated to Handle Capacitive Loads  
In the circuit of Figure 20, R1 and C1 serve to counteract the loss of phase margin by feeding the high frequency  
component of the output signal back to the inverting input of the amplifier, thereby preserving phase margin in  
the overall feedback loop.  
Capacitive load driving capability is enhanced by using a pullup resistor to V+ (Figure 21). Typically a pullup  
resistor conducting 500 µA or more will significantly improve capacitive load responses. The value of the pullup  
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 pullup resistor. See DC Electrical  
Characteristics for LMC6001AI.  
Figure 21. Compensating for Large Capacitive Loads with a Pullup Resistor  
7.2 Typical Application  
The extremely high input resistance, and low power consumption, of the LMC6001 make it ideal for applications  
that require battery-powered instrumentation amplifiers. Examples of these types of applications are hand-held  
pH probes, analytic medical instruments, electrostatic field detectors and gas chromotographs.  
R2  
R1  
œ
VIN  
LMC6001  
VOUT  
+
Figure 22. Typical Application Schematic, LMC6001  
Copyright © 2017, Texas Instruments Incorporated  
Submit Documentation Feedback  
11  
Product Folder Links: LMC6001-MIL  
 
 
LMC6001-MIL  
SNOSD60 JUNE 2017  
www.ti.com  
Typical Application (continued)  
7.2.1 Two Op Amp, Temperature Compensated Ph Probe Amplifier  
The signal from a pH probe has a typical resistance between 10 MΩ and 1000 MΩ. Because of this high value, it  
is very important that the amplifier input currents be as small as possible. The LMC6001 with less than 25-fA  
input current is an ideal choice for this application.  
The LMC6001 amplifies the probe output providing a scaled voltage of ±100 mV/pH from a pH of 7. The second  
op amp, a micropower LMC6041 provides phase inversion and offset so that the output is directly proportional to  
pH, over the full range of the probe. The pH reading can now be directly displayed on a low-cost, low-power  
digital panel meter. Total current consumption will be about 1 mA for the whole system.  
The micropower dual-operational amplifier, LMC6042, would optimize power consumption but not offer these  
advantages:  
1. The LMC6001A ensures a 25-fA limit on input current at 25°C.  
2. The input ESD protection diodes in the LMC6042 are only rated at 500 V while the LMC6001 has much more  
robust protection that is rated at 2000 V.  
(1)  
R1 100 k + 3500 ppm/°C  
R2 68.1 k  
R3, 8 5 k  
R4, 9 100 k  
R5 36.5 k  
R6 619 k  
R7 97.6 k  
D1 LM4040D1Z-2.5  
C1 2.2 µF  
(2) µΩ style 137 or similar  
Figure 23. Ph Probe Amplifier  
7.2.1.1 Design Requirements  
The theoretical output of the standard Ag/AgCl pH probe is 59.16 mV/pH at 25°C with 0 V out at a pH of 7.00.  
This output is proportional to absolute temperature. To compensate for this, a temperature-compensating  
resistor, R1, is placed in the feedback loop. This cancels the temperature dependence of the probe. This resistor  
must be mounted where it will be at the same temperature as the liquid being measured.  
7.2.1.2 Detailed Design Procedure  
The set-up and calibration is simple with no interactions to cause problems.  
12  
Submit Documentation Feedback  
Copyright © 2017, Texas Instruments Incorporated  
Product Folder Links: LMC6001-MIL  
LMC6001-MIL  
www.ti.com  
SNOSD60 JUNE 2017  
Typical Application (continued)  
1. Disconnect the pH probe and with R3 set to about mid-range and the noninverting input of the LMC6001  
grounded, adjust R8 until the output is 700 mV.  
2. Apply 414.1 mV to the noninverting input of the LMC6001. Adjust R3 for and output of 1400 mV. This  
completes the calibration. As real pH probes may not perform exactly to theory, minor gain and offset  
adjustments should be made by trimming while measuring a precision buffer solution.  
7.2.1.3 Application Curve  
VS = ±5 V  
Figure 24. Input Current vs. VCM  
7.3 System Example  
7.3.1 Ultra-Low Input Current Instrumentation Amplifier  
Figure 25 shows an instrumentation amplifier that features high-differential and common-mode input resistance  
(>1014Ω), 0.01% gain accuracy at AV = 1000, excellent CMRR with 1-MΩ imbalance in source resistance. Input  
current is less than 20 fA and offset drift is less than 2.5 µV/°C. R2 provides a simple means of adjusting gain  
over a wide range without degrading CMRR. R7 is an initial trim used to maximize CMRR without using super  
precision matched resistors. For good CMRR over temperature, low-drift resistors should be used.  
If R1 = R5, R3 = R6, and R4 = R7; then  
AV 100 for circuit shown (R2 = 9.85k).  
Figure 25. Instrumentation Amplifier  
Copyright © 2017, Texas Instruments Incorporated  
Submit Documentation Feedback  
13  
Product Folder Links: LMC6001-MIL  
 
LMC6001-MIL  
SNOSD60 JUNE 2017  
www.ti.com  
8 Power Supply Recommendations  
See the Recommended Operating Conditions for the minimum and maximum values for the supply input voltage  
and operating junction temperature.  
9 Layout  
9.1 Layout Guidelines  
9.1.1 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 PCB. When one wishes to take advantage of the ultra-low bias current of the LMC6001,  
typically less than 10 fA, 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 PCB, 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 inputs of the  
LMC6001 and the terminals of capacitors, diodes, conductors, resistors, relay terminals, and so forth, connected  
to the inputs of the op amp, as in Figure 30. To have a significant effect, guard rings must be placed on both the  
top and bottom of the PCB. This PC foil must then be connected to a voltage which is at the same voltage as the  
amplifier inputs, because no leakage current can flow between two points at the same potential. For example, a  
PCB trace-to-pad resistance of 10 TΩ, which is normally considered a very large resistance, could leak 5 pA if  
the trace were a 5-V bus adjacent to the pad of the input.  
This would cause a 500 times degradation from the LMC6001's actual performance. If a guard ring is used and  
held within 1 mV of the inputs, then the same resistance of 10 TΩ will only cause 10 fA of leakage current. Even  
this small amount of leakage will degrade the extremely low input current performance of the LMC6001. See  
Figure 28 for typical connections of guard rings for standard op amp configurations.  
Figure 26. Inverting Amplifier  
Figure 27. Noninverting Amplifier  
Figure 28. Typical Connections of Guard Rings  
14  
Submit Documentation Feedback  
Copyright © 2017, Texas Instruments Incorporated  
Product Folder Links: LMC6001-MIL  
 
LMC6001-MIL  
www.ti.com  
SNOSD60 JUNE 2017  
Layout Guidelines (continued)  
The designer should be aware that when it is inappropriate to lay out a PCB for the sake of just a few circuits,  
there is another technique which is even better than a guard ring on a PCB: Do not insert the input pin of the  
amplifier 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 PCB construction, but the advantages  
are sometimes well worth the effort of using point-to-point up-in-the-air wiring. See Figure 29.  
(Input pins are lifted out of PCB and soldered directly to components. All other pins connected to PCB).  
Figure 29. Air Wiring  
Another potential source of leakage that might be overlooked is the device package. When the LMC6001 is  
manufactured, the device is always handled with conductive finger cots. This is to assure that salts and skin oils  
do not cause leakage paths on the surface of the package. We recommend that these same precautions be  
adhered to, during all phases of inspection, test and assembly.  
9.2 Layout Example  
Figure 30. Examples of Guard  
Ring in PCB Layout  
Copyright © 2017, Texas Instruments Incorporated  
Submit Documentation Feedback  
15  
Product Folder Links: LMC6001-MIL  
 
LMC6001-MIL  
SNOSD60 JUNE 2017  
www.ti.com  
10 Device and Documentation Support  
10.1 Documentation Support  
10.1.1 Related Documentation  
For related documentation, see the following:  
LMC660 CMOS Quad Operational Amplifier, SNOSBZ3  
LMC662 CMOS Dual Operational Amplifier, SNOSC51  
10.2 Related Links  
Table 1 lists quick access links. Categories include technical documents, support and community resources,  
tools and software, and quick access to sample or buy.  
Table 1. Related Links  
TECHNICAL  
DOCUMENTS  
TOOLS &  
SOFTWARE  
SUPPORT &  
COMMUNITY  
PARTS  
PRODUCT FOLDER  
SAMPLE & BUY  
LMC6001-MIL  
Click here  
Click here  
Click here  
Click here  
Click here  
10.3 Community Resources  
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective  
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of  
Use.  
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration  
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help  
solve problems with fellow engineers.  
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and  
contact information for technical support.  
10.4 Trademarks  
E2E is a trademark of Texas Instruments.  
All other trademarks are the property of their respective owners.  
10.5 Electrostatic Discharge Caution  
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.  
10.6 Glossary  
SLYZ022 TI Glossary.  
This glossary lists and explains terms, acronyms, and definitions.  
11 Mechanical, Packaging, and Orderable Information  
The following pages include mechanical packaging and orderable information. This information is the most  
current data available for the designated devices. This data is subject to change without notice and revision of  
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.  
16  
Submit Documentation Feedback  
Copyright © 2017, Texas Instruments Incorporated  
Product Folder Links: LMC6001-MIL  
 
PACKAGE OPTION ADDENDUM  
www.ti.com  
10-Dec-2020  
PACKAGING INFORMATION  
Orderable Device  
Status Package Type Package Pins Package  
Eco Plan  
Lead finish/  
Ball material  
MSL Peak Temp  
Op Temp (°C)  
Device Marking  
Samples  
Drawing  
Qty  
(1)  
(2)  
(3)  
(4/5)  
(6)  
LMC6001A MDC  
ACTIVE  
DIESALE  
Y
0
270  
RoHS & Green  
Call TI  
Level-1-NA-UNLIM  
-40 to 85  
(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.  
(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 1  
IMPORTANT NOTICE AND DISCLAIMER  
TI PROVIDES TECHNICAL AND RELIABILITY DATA (INCLUDING DATASHEETS), DESIGN RESOURCES (INCLUDING REFERENCE  
DESIGNS), APPLICATION OR OTHER DESIGN ADVICE, WEB TOOLS, SAFETY INFORMATION, AND OTHER RESOURCES “AS IS”  
AND WITH ALL FAULTS, AND DISCLAIMS ALL WARRANTIES, EXPRESS AND IMPLIED, INCLUDING WITHOUT LIMITATION ANY  
IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD  
PARTY INTELLECTUAL PROPERTY RIGHTS.  
These resources are intended for skilled developers designing with TI products. You are solely responsible for (1) selecting the appropriate  
TI products for your application, (2) designing, validating and testing your application, and (3) ensuring your application meets applicable  
standards, and any other safety, security, or other requirements. These resources are subject to change without notice. TI grants you  
permission to use these resources only for development of an application that uses the TI products described in the resource. Other  
reproduction and display of these resources is prohibited. No license is granted to any other TI intellectual property right or to any third  
party intellectual property right. TI disclaims responsibility for, and you will fully indemnify TI and its representatives against, any claims,  
damages, costs, losses, and liabilities arising out of your use of these resources.  
TI’s products are provided subject to TI’s Terms of Sale (www.ti.com/legal/termsofsale.html) or other applicable terms available either on  
ti.com or provided in conjunction with such TI products. TI’s provision of these resources does not expand or otherwise alter TI’s applicable  
warranties or warranty disclaimers for TI products.  
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265  
Copyright © 2020, Texas Instruments Incorporated  

相关型号:

LMC6001A MDC

超低输入电流放大器 | Y | 0 | -40 to 85
TI

LMC6001AIH

Ultra Ultra-Low Input Current Amplifier
NSC

LMC6001AIN

Ultra Ultra-Low Input Current Amplifier
NSC

LMC6001AIN/NOPB

IC OP-AMP, 700 uV OFFSET-MAX, 1.3 MHz BAND WIDTH, PDIP8, PLASTIC, DIP-8, Operational Amplifier
NSC

LMC6001AIN/NOPB

超低输入电流放大器 | P | 8 | -40 to 85
TI

LMC6001AMWC

暂无描述
NSC

LMC6001BIH

Ultra Ultra-Low Input Current Amplifier
NSC

LMC6001BIN

Ultra Ultra-Low Input Current Amplifier
NSC

LMC6001BIN/NOPB

IC OP-AMP, 1350 uV OFFSET-MAX, 1.3 MHz BAND WIDTH, PDIP8, PLASTIC, DIP-8, Operational Amplifier
NSC

LMC6001BIN/NOPB

超低输入电流放大器 | P | 8 | -40 to 85
TI

LMC6001CIN

Ultra Ultra-Low Input Current Amplifier
NSC

LMC6001CMDC

暂无描述
NSC