LMP2011 Single/ LMP2012 Dual
High Precision, Rail-to-Rail Output Operational Amplifier
General Description
The LMP201x series are the first members of National’s new
LMP
TM
precision amplifier family. The LMP201X series of-
fers unprecedented accuracy and stability in space-saving
miniature packaging while also being offered at an affordable
price. This device utilizes patented techniques to measure
and continually correct the input offset error voltage. The
result is an amplifier which is ultra stable over time and
temperature. It has excellent CMRR and PSRR ratings, and
does not exhibit the familiar 1/f voltage and current noise
increase that plagues traditional amplifiers. The combination
of the LMP201X characteristics makes it a good choice for
transducer amplifiers, high gain configurations, ADC buffer
amplifiers, DAC I-V conversion, and any other 2.7V-5V ap-
plication requiring precision and long term stability.
Other useful benefits of the LMP201X are rail-to-rail output,
a low supply current of 930 µA, and wide gain-bandwidth
product of 3 MHz. These extremely versatile features found
in the LMP201X provide high performance and ease of use.
Features
(For V
S
= 5V, Typical unless otherwise noted)
nLow guaranteed V
OS
over temperature 60 µV
nLow noise with no 1/f 35nV/
nHigh CMRR 130 dB
nHigh PSRR 120 dB
nHigh A
VOL
130 dB
nWide gain-bandwidth product 3MHz
nHigh slew rate 4V/µs
nLow supply current 930µA
nRail-to-rail output 30mV
nNo external capacitors required
Applications
nPrecision instrumentation amplifiers
nThermocouple amplifiers
nStrain gauge bridge amplifier
Connection Diagrams
5-Pin SOT23 8-Pin SOIC
20071502
Top View 20071542
Top View
8-Pin MSOP
20071538
Top View
February 2006
LMP2011 Single/ LMP2012 Dual Quad High Precision, Rail-to-Rail Output Operational Amplifier
© 2006 National Semiconductor Corporation DS200715 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
Human Body Model 2000V
Machine Model 200V
Supply Voltage 5.8V
Common-Mode Input
Voltage −0.3 ≤V
CM
≤V
CC
+0.3V
Lead Temperature
(soldering 10 sec.) +300˚C
Differential Input Voltage ±Supply Voltage
Current at Input Pin 30 mA
Current at Output Pin 30 mA
Current at Power Supply Pin 50 mA
Operating Ratings (Note 1)
Supply Voltage 2.7V to 5.25V
Storage Temperature Range −65˚C to 150˚C
Operating Temperature Range −40˚C to 125˚C
2.7V DC Electrical Characteristics Unless otherwise specified, all limits guaranteed for T
J
= 25˚C,
V
+
= 2.7V, V
-
= 0V, V
CM
= 1.35V, V
O
= 1.35V and R
L
>1MΩ.Boldface limits apply at the temperature extremes.
Symbol Parameter Conditions
Min
(Note 3)
Typ
(Note 2)
Max
(Note 3) Units
V
OS
Input Offset Voltage
(LMP2011 only)
0.8 25
60 µV
Input Offset Voltage
(LMP2012 only)
0.8 36
60
Offset Calibration Time 0.5 10
12
ms
TCV
OS
Input Offset Voltage 0.015 µV/˚C
Long-Term Offset Drift 0.006 µV/month
Lifetime V
OS
Drift 2.5 µV
I
IN
Input Current -3 pA
I
OS
Input Offset Current 6 pA
R
IND
Input Differential Resistance 9 MΩ
CMRR Common Mode Rejection
Ratio
−0.3 ≤V
CM
≤0.9V
0≤V
CM
≤0.9V
95
90
130 dB
PSRR Power Supply Rejection Ratio 95
90
120 dB
A
VOL
Open Loop Voltage Gain R
L
=10kΩ95
90
130
dB
R
L
=2kΩ90
85
124
V
O
Output Swing
(LMP2011 only)
R
L
=10kΩto 1.35V
V
IN
(diff) = ±0.5V
2.665
2.655
2.68
V
0.033 0.060
0.075
R
L
=2kΩto 1.35V
V
IN
(diff) = ±0.5V
2.630
2.615
2.65
V
0.061 0.085
0.105
Output Swing
(LMP2012 only)
R
L
=10kΩto 1.35V
V
IN
(diff) = ±0.5V
2.64
2.63
2.68
V
0.033 0.060
0.075
R
L
=2kΩto 1.35V
V
IN
(diff) = ±0.5V
2.615
2.6
2.65
V
0.061 0.085
0.105
LMP2011 Single/ LMP2012 Dual
www.national.com 2
2.7V DC Electrical Characteristics Unless otherwise specified, all limits guaranteed for T
J
= 25˚C,
V+= 2.7V, V-= 0V, V
CM
= 1.35V, V
O
= 1.35V and R
L
>1MΩ.Boldface limits apply at the temperature
extremes. (Continued)
Symbol Parameter Conditions
Min
(Note 3)
Typ
(Note 2)
Max
(Note 3) Units
I
O
Output Current Sourcing, V
O
=0V
V
IN
(diff) = ±0.5V
5
3
12
mA
Sinking, V
O
=5V
V
IN
(diff) = ±0.5V
5
3
18
I
S
Supply Current per Channel 0.919 1.20
1.50
mA
2.7V AC Electrical Characteristics T
J
= 25˚C, V
+
= 2.7V, V
-
= 0V, V
CM
= 1.35V, V
O
= 1.35V, and R
L
>1MΩ.Boldface limits apply at the temperature extremes.
Symbol Parameter Conditions
Min
(Note 3)
Typ
(Note 2)
Max
(Note 3) Units
GBW Gain-Bandwidth Product 3 MHz
SR Slew Rate 4 V/µs
θ
m
Phase Margin 60 Deg
G
m
Gain Margin −14 dB
e
n
Input-Referred Voltage Noise 35 nV/
i
n
Input-Referred Current Noise pA/
e
n
p-p Input-Referred Voltage Noise R
S
= 100Ω,DCto10Hz 850 nV
pp
t
rec
Input Overload Recovery Time 50 ms
5V DC Electrical Characteristics Unless otherwise specified, all limits guaranteed for T
J
= 25˚C, V
+
=
5V, V
-
= 0V, V
CM
= 2.5V, V
O
= 2.5V and R
L
>1MΩ.Boldface limits apply at the temperature extremes.
Symbol Parameter Conditions
Min
(Note 3)
Typ
(Note 2)
Max
(Note 3) Units
V
OS
Input Offset Voltage
(LMP2011 only)
0.12 25
60 µV
Input Offset Voltage
(LMP2012 only)
0.12 36
60
Offset Calibration Time 0.5 10
12
ms
TCV
OS
Input Offset Voltage 0.015 µV/˚C
Long-Term Offset Drift 0.006 µV/month
Lifetime V
OS
Drift 2.5 µV
I
IN
Input Current -3 pA
I
OS
Input Offset Current 6 pA
R
IND
Input Differential Resistance 9 MΩ
CMRR Common Mode Rejection
Ratio
−0.3 ≤V
CM
≤3.2
0≤V
CM
≤3.2
100
90
130 dB
PSRR Power Supply Rejection Ratio 95
90
120 dB
A
VOL
Open Loop Voltage Gain R
L
=10kΩ105
100
130
dB
R
L
=2kΩ95
90
132
LMP2011 Single/ LMP2012 Dual
www.national.com3
5V DC Electrical Characteristics Unless otherwise specified, all limits guaranteed for T
J
= 25˚C, V
+
=
5V, V
-
= 0V, V
CM
= 2.5V, V
O
= 2.5V and R
L
>1MΩ.Boldface limits apply at the temperature extremes. (Continued)
Symbol Parameter Conditions
Min
(Note 3)
Typ
(Note 2)
Max
(Note 3) Units
V
O
Output Swing
(LMP2011 only)
R
L
=10kΩto 2.5V
V
IN
(diff) = ±0.5V
4.96
4.95
4.978
V
0.040 0.070
0.085
R
L
=2kΩto 2.5V
V
IN
(diff) = ±0.5V
4.895
4.875
4.919
V
0.091 0.115
0.140
Output Swing
(LMP2012 only)
R
L
=10kΩto 2.5V
V
IN
(diff) = ±0.5V
4.92
4.91
4.978
V
0.040 0.080
0.095
R
L
=2kΩto 2.5V
V
IN
(diff) = ±0.5V
4.875
4.855
4.919
V
0.0.91 0.125
0.150
I
O
Output Current Sourcing, V
O
=0V
V
IN
(diff) = ±0.5V
8
6
15
mA
Sinking, V
O
=5V
V
IN
(diff) = ±0.5V
8
6
17
I
S
Supply Current per Channel 0.930 1.20
1.50
mA
5V AC Electrical Characteristics T
J
= 25˚C, V
+
= 5V, V
-
= 0V, V
CM
= 2.5V, V
O
= 2.5V, and R
L
>
1MΩ.Boldface limits apply at the temperature extremes.
Symbol Parameter Conditions
Min
(Note 3)
Typ
(Note 2)
Max
(Note 3) Units
GBW Gain-Bandwidth Product 3 MHz
SR Slew Rate 4 V/µs
θ
m
Phase Margin 60 deg
G
m
Gain Margin −15 dB
e
n
Input-Referred Voltage Noise 35 nV/
i
n
Input-Referred Current Noise pA/
e
n
p-p Input-Referred Voltage Noise R
S
= 100Ω,DCto10Hz 850 nV
pp
t
rec
Input Overload Recovery Time 50 ms
LMP2011 Single/ LMP2012 Dual
www.national.com 4
Note 1: Absolute Maximum Ratings indicate limits beyond which damage may occur. Operating Ratings indicate conditions for which the device is intended to be
functional, but specific performance is not guaranteed. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: Typical values represent the most likely parametric norm.
Note 3: Limits are 100% production tested at 25˚C. Limits over the operating temperature range are guaranteed through correlations using statistical quality control
(SQC) method.
Ordering Information
Package Part Number Temperature
Range
Package Marking Transport Media NSC Drawing
5-Pin SOT23 LMP2011MF
−40˚C to 125˚C
AN1A 1k Units Tape and Reel MF05A
LMP2011MFX 3k Units Tape and Reel
8-Pin MSOP LMP2012MM AP1A 1k Units Tape and Reel MUA08A
LMP2012MMX 3.5k Units Tape and Reel
8-Pin SOIC
LMP2011MA LMP2011MA 95 Units/Rail
M08A
LMP2011MAX 2.5k Units Tape and Reel
LMP2012MA LMP2012MA 95 Units/Rail
LMP2012MAX 2.5k Units Tape and Reel
LMP2011 Single/ LMP2012 Dual
www.national.com5
Typical Performance Characteristics
T
A
=25C, V
S
= 5V unless otherwise specified.
Supply Current vs. Supply Voltage Offset Voltage vs. Supply Voltage
20071555 20071556
Offset Voltage vs. Common Mode Offset Voltage vs. Common Mode
20071557 20071558
Voltage Noise vs. Frequency Input Bias Current vs. Common Mode
20071504 20071503
LMP2011 Single/ LMP2012 Dual
www.national.com 6
Typical Performance Characteristics (Continued)
PSRR vs. Frequency PSRR vs. Frequency
20071507 20071506
Output Sourcing @2.7V Output Sourcing @5V
20071559 20071560
Output Sinking @2.7V Output Sinking @5V
20071561 20071562
LMP2011 Single/ LMP2012 Dual
www.national.com7
Typical Performance Characteristics (Continued)
Max Output Swing vs. Supply Voltage Max Output Swing vs. Supply Voltage
20071563 20071564
Min Output Swing vs. Supply Voltage Min Output Swing vs. Supply Voltage
20071565 20071566
CMRR vs. Frequency Open Loop Gain and Phase vs. Supply Voltage
20071505 20071508
LMP2011 Single/ LMP2012 Dual
www.national.com 8
Typical Performance Characteristics (Continued)
Open Loop Gain and Phase vs. R
L
@2.7V Open Loop Gain and Phase vs. R
L
@5V
20071509 20071510
Open Loop Gain and Phase vs. C
L
@2.7V Open Loop Gain and Phase vs. C
L
@5V
20071511 20071512
Open Loop Gain and Phase vs. Temperature @2.7V Open Loop Gain and Phase vs. Temperature @5V
20071536 20071537
LMP2011 Single/ LMP2012 Dual
www.national.com9
Typical Performance Characteristics (Continued)
THD+N vs. AMPL THD+N vs. Frequency
20071514 20071513
0.1 Hz − 10 Hz Noise vs. Time
20071515
LMP2011 Single/ LMP2012 Dual
www.national.com 10
Application Information
THE BENEFITS OF LMP201X
NO 1/f NOISE
Using patented methods, the LMP201X eliminates the 1/f
noise present in other amplifiers. That noise, which in-
creases as frequency decreases, is a major source of mea-
surement error in all DC-coupled measurements. Low-
frequency noise appears as a constantly-changing signal in
series with any measurement being made. As a result, even
when the measurement is made rapidly, this constantly-
changing noise signal will corrupt the result. The value of this
noise signal can be surprisingly large. For example: If a
conventional amplifier has a flat-band noise level of 10nV/
and a noise corner of 10 Hz, the RMS noise at 0.001
Hz is 1µV/ . This is equivalent to a 0.50 µV peak-to-
peak error, in the frequency range 0.001 Hz to 1.0 Hz. In a
circuit with a gain of 1000, this produces a 0.50 mV peak-
to-peak output error. This number of 0.001 Hz might appear
unreasonably low, but when a data acquisition system is
operating for 17 minutes, it has been on long enough to
include this error. In this same time, the LMP201X will only
have a 0.21 mV output error. This is smaller by 2.4 x. Keep
in mind that this 1/f error gets even larger at lower frequen-
cies. At the extreme, many people try to reduce this error by
integrating or taking several samples of the same signal.
This is also doomed to failure because the 1/f nature of this
noise means that taking longer samples just moves the
measurement into lower frequencies where the noise level is
even higher.
The LMP201X eliminates this source of error. The noise
level is constant with frequency so that reducing the band-
width reduces the errors caused by noise.
Another source of error that is rarely mentioned is the error
voltage caused by the inadvertent thermocouples created
when the common "Kovar type" IC package lead materials
are soldered to a copper printed circuit board. These steel-
based leadframe materials can produce over 35 µV/˚C when
soldered onto a copper trace. This can result in thermo-
couple noise that is equal to the LMP201X noise when there
is a temperature difference of only 0.0014˚C between the
lead and the board!
For this reason, the lead-frame of the LMP201X is made of
copper. This results in equal and opposite junctions which
cancel this effect. The extremely small size of the SOT-23
package results in the leads being very close together. This
further reduces the probability of temperature differences
and hence decreases thermal noise.
OVERLOAD RECOVERY
The LMP201X recovers from input overload much faster
than most chopper-stabilized op amps. Recovery from driv-
ing the amplifier to 2X the full scale output, only requires
about 40 ms. Many chopper-stabilized amplifiers will take
from 250 ms to several seconds to recover from this same
overload. This is because large capacitors are used to store
the unadjusted offset voltage.
The wide bandwidth of the LMP201X enhances performance
when it is used as an amplifier to drive loads that inject
transients back into the output. ADCs (Analog-to-Digital Con-
verters) and multiplexers are examples of this type of load.
To simulate this type of load, a pulse generator producing a
1V peak square wave was connected to the output through a
10 pF capacitor. (Figure 1) The typical time for the output to
recover to 1% of the applied pulse is 80 ns. To recover to
0.1% requires 860ns. This rapid recovery is due to the wide
bandwidth of the output stage and large total GBW.
NO EXTERNAL CAPACITORS REQUIRED
The LMP201X does not need external capacitors. This elimi-
nates the problems caused by capacitor leakage and dielec-
tric absorption, which can cause delays of several seconds
from turn-on until the amplifier’s error has settled.
MORE BENEFITS
The LMP201X offers the benefits mentioned above and
more. It has a rail-to-rail output and consumes only 950 µA of
supply current while providing excellent DC and AC electrical
performance. In DC performance, the LMP201X achieves
130 dB of CMRR, 120 dB of PSRR and 130 dB of open loop
gain. In AC performance, the LMP201X provides 3 MHz of
gain-bandwidth product and 4 V/µs of slew rate.
HOW THE LMP201X WORKS
The LMP201X uses new, patented techniques to achieve the
high DC accuracy traditionally associated with chopper-
stabilized amplifiers without the major drawbacks produced
by chopping. The LMP201X continuously monitors the input
offset and corrects this error. The conventional chopping
process produces many mixing products, both sums and
differences, between the chopping frequency and the incom-
ing signal frequency. This mixing causes large amounts of
distortion, particularly when the signal frequency approaches
the chopping frequency. Even without an incoming signal,
the chopper harmonics mix with each other to produce even
more trash. If this sounds unlikely or difficult to understand,
look at the plot (Figure 2), of the output of a typical (MAX432)
chopper-stabilized op amp. This is the output when there is
no incoming signal, just the amplifier in a gain of -10 with the
input grounded. The chopper is operating at about 150 Hz;
the rest is mixing products. Add an input signal and the noise
gets much worse. Compare this plot with Figure 3 of the
LMP201X. This data was taken under the exact same con-
ditions. The auto-zero action is visible at about 30 kHz but
note the absence of mixing products at other frequencies. As
a result, the LMP201X has very low distortion of 0.02% and
very low mixing products.
20071516
FIGURE 1.
LMP2011 Single/ LMP2012 Dual
www.national.com11
Application Information (Continued)
INPUT CURRENTS
The LMP201X’s input currents are different than standard
bipolar or CMOS input currents in that it appears as a current
flowing in one input and out the other. Under most operating
conditions, these currents are in the picoamp level and will
have little or no effect in most circuits. These currents tend to
increase slightly when the common-mode voltage is near the
minus supply. (See the typical curves.) At high temperatures
such as 85˚C, the input currents become larger, 0.5 nA
typical, and are both positive except when the V
CM
is near
V
−
. If operation is expected at low common-mode voltages
and high temperature, do not add resistance in series with
the inputs to balance the impedances. Doing this can cause
an increase in offset voltage. A small resistance such as 1
kΩcan provide some protection against very large transients
or overloads, and will not increase the offset significantly.
PRECISION STRAIN-GAUGE AMPLIFIER
This Strain-Gauge amplifier (Figure 4) provides high gain
(1006 or ~60 dB) with very low offset and drift. Using the
resistors’ tolerances as shown, the worst case CMRR will be
greater than 108 dB. The CMRR is directly related to the
resistor mismatch. The rejection of common-mode error, at
the output, is independent of the differential gain, which is
set by R3. The CMRR is further improved, if the resistor ratio
matching is improved, by specifying tighter-tolerance resis-
tors, or by trimming.
Extending Supply Voltages and Output Swing by Using
a Composite Amplifier Configuration:
In cases where substantially higher output swing is required
with higher supply voltages, arrangements like the ones
shown in Figure 5 and Figure 6 could be used. These
configurations utilize the excellent DC performance of the
LMP201X while at the same time allow the superior voltage
and frequency capabilities of the LM6171 to set the dynamic
performance of the overall amplifier. For example, it is pos-
sible to achieve ±12V output swing with 300 MHz of overall
GBW (A
V
= 100) while keeping the worst case output shift
due to V
OS
less than 4 mV. The LMP201X output voltage is
kept at about mid-point of its overall supply voltage, and its
input common mode voltage range allows the V- terminal to
be grounded in one case (Figure 5, inverting operation) and
tied to a small non-critical negative bias in another (Figure 6,
non-inverting operation). Higher closed-loop gains are also
possible with a corresponding reduction in realizable band-
width. Table 1 shows some other closed loop gain possibili-
ties along with the measured performance in each case.
20071517
FIGURE 2.
20071504
FIGURE 3.
20071518
FIGURE 4.
LMP2011 Single/ LMP2012 Dual
www.national.com 12
Application Information (Continued)
TABLE 1. Composite Amplifier Measured Performance
AV R1
Ω
R2
Ω
C2
pF
BW
MHz
SR
(V/µs)
en p-p
(mV
PP
)
50 200 10k 8 3.3 178 37
100 100 10k 10 2.5 174 70
100 1k 100k 0.67 3.1 170 70
500 200 100k 1.75 1.4 96 250
1000 100 100k 2.2 0.98 64 400
In terms of the measured output peak-to-peak noise, the
following relationship holds between output noise voltage, e
n
p-p, for different closed-loop gain, A
V
, settings, where −3 dB
Bandwidth is BW:
It should be kept in mind that in order to minimize the output
noise voltage for a given closed-loop gain setting, one could
minimize the overall bandwidth. As can be seen from Equa-
tion 1 above, the output noise has a square-root relationship
to the Bandwidth.
In the case of the inverting configuration, it is also possible to
increase the input impedance of the overall amplifier, by
raising the value of R1, without having to increase the feed-
back resistor, R2, to impractical values, by utilizing a "Tee"
network as feedback. See the LMC6442 data sheet (Appli-
cation Notes section) for more details on this.
20071519
FIGURE 5.
20071520
FIGURE 6.
20071521
FIGURE 7.
LMP2011 Single/ LMP2012 Dual
www.national.com13
Application Information (Continued)
LMP201X AS ADC INPUT AMPLIFIER
The LMP201X is a great choice for an amplifier stage imme-
diately before the input of an ADC (Analog-to-Digital Con-
verter), whether AC or DC coupled. See Figure 7 and Figure
8. This is because of the following important characteristics:
A) Very low offset voltage and offset voltage drift over time
and temperature allow a high closed-loop gain setting
without introducing any short-term or long-term errors.
For example, when set to a closed-loop gain of 100 as
the analog input amplifier for a 12-bit A/D converter, the
overall conversion error over full operation temperature
and 30 years life of the part (operating at 50˚C) would be
less than 5 LSBs.
B) Fast large-signal settling time to 0.01% of final value (1.4
µs) allows 12 bit accuracy at 100 KH
Z
or more sampling
rate.
C) No flicker (1/f) noise means unsurpassed data accuracy
over any measurement period of time, no matter how
long. Consider the following op amp performance, based
on a typical low-noise, high-performance commercially-
available device, for comparison:
Op amp flatband noise = 8nV/
1/f corner frequency = 100 Hz
A
V
= 2000
Measurement time = 100 sec
Bandwidth=2Hz
This example will result in about 2.2 mV
PP
(1.9 LSB) of
output noise contribution due to the op amp alone, com-
pared to about 594 µV
PP
(less than 0.5 LSB) when that
op amp is replaced with the LMP201X which has no 1/f
contribution. If the measurement time is increased from
100 seconds to 1 hour, the improvement realized by
using the LMP201X would be a factor of about 4.8 times
(2.86 mV
PP
compared to 596 µV when LMP201X is
used) mainly because the LMP201X accuracy is not
compromised by increasing the observation time.
D) Copper leadframe construction minimizes any thermo-
couple effects which would degrade low level/high gain
data conversion application accuracy (see discussion
under "The Benefits of the LMP201X" section above).
E) Rail-to-Rail output swing maximizes the ADC dynamic
range in 5-Volt single-supply converter applications. Be-
low are some typical block diagrams showing the
LMP201X used as an ADC amplifier (Figure 7 and Figure
8).
20071522
FIGURE 8.
LMP2011 Single/ LMP2012 Dual
www.national.com 14
Physical Dimensions inches (millimeters) unless otherwise noted
5-Pin SOT23
NS Package Number MF0A5
8-Pin MSOP
NS Package Number MUA08A
LMP2011 Single/ LMP2012 Dual
www.national.com15
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
8-Pin SOIC
NS Package Number M08A
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
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Email: ap.support@nsc.com
National Semiconductor
Japan Customer Support Center
Fax: 81-3-5639-7507
Email: jpn.feedback@nsc.com
Tel: 81-3-5639-7560
www.national.com
LMP2011 Single/ LMP2012 Dual Quad High Precision, Rail-to-Rail Output Operational Amplifier
