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PDF LMV2011 Data sheet ( Hoja de datos )
| Número de pieza | LMV2011 | |
| Descripción | High Precision / Rail-to-Rail Output Operational Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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April 2004
LMV2011
High Precision, Rail-to-Rail Output Operational Amplifier
General Description
The LMV2011 is a new precision amplifier that offers unprec-
edented accuracy and stability at an affordable price and is
offered in miniature (SOT23-5) package and in 8 lead SOIC
package. This device utilizes patented techniques to mea-
sure 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 LMV2011 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 LMV2011 are rail-to-rail output, a
low supply current of 930µA, and wide gain-bandwidth prod-
uct of 3MHz. These extremely versatile features found in the
LMV2011 provide high performance and ease of use.
Features
(For Vs = 5V, Typical unless otherwise noted)
n Low Guaranteed Vos over temperature
n Low Noise with no 1/f
n High CMRR
n High PSRR
n High AVOL
n Wide gain-bandwidth product
n High slew rate
n Low supply current
n Rail-to-rail output
n No external capacitors required
35µV
35nV/
130dB
120dB
130dB
3MHz
4V/µs
930µA
30mV
Applications
n Precision Instrumentation Amplifiers
n Thermocouple Amplifiers
n Strain Gauge Bridge Amplifier
Connection Diagrams
5-Pin SOT23
8-Pin SOIC
Top View
Ordering Information
Package
5-Pin SOT23
8-Pin SOIC
Part Number
LMV2011MF
LMV2011MFX
LMV2011MA
LMV2011MAX
20051502
Package Marking
A84A
LMV2011MA
Top View
20051538
Transport Media
1k Units Tape and Reel
3k Units Tape and Reel
95 Units/Rail
2.5k Units Tape and Reel
NSC Drawing
MF05A
M08A
© 2004 National Semiconductor Corporation DS200515
www.national.com
1 page  
Typical Performance Characteristics
TA=25C, VS= 5V unless otherwise specified.
Supply Current vs. Supply Voltage
Offset Voltage vs. Supply Voltage
20051524
Offset Voltage vs. Common Mode
20051525
Offset Voltage vs. Common Mode
20051535
Voltage Noise vs. Frequency
20051534
Input Bias Current vs. Common Mode
20051504
5
20051503
www.national.com
5 Page 
Application Information (Continued)
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.
FIGURE 2.
20051517
FIGURE 3.
20051504
INPUT CURRENTS
The LMV2011’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, 0.5nA typi-
cal, and are both positive except when the VCM 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 1kΩ
can provide some protection against very large transients or
overloads, and will not increase the offset significantly.
20051518
FIGURE 4.
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
LMV2011 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 300MHz of overall
GBW (AV = 100) while keeping the worst case output shift
due to VOS less than 4mV. The LMV2011 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.
11 www.national.com
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet LMV2011.PDF ] | |
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