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PDF LMP2011 Data sheet ( Hoja de datos )
| Número de pieza | LMP2011 | |
| Descripción | High Precision / Rail-to-Rail Output Operational Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LMP2011 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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PRELIMINARY
October 2004
LMP2011 Single/ LMP2012 Dual/ LMP2014 Quad
High Precision, Rail-to-Rail Output Operational Amplifier
General Description
The LMP201X is a new precision amplifier family that offers
unprecedented accuracy and stability at an affordable price
and is offered in miniature packages. 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 tradi-
tional amplifiers. The combination of the LMP201X charac-
teristics makes it a good choice for transducer amplifiers,
high gain configurations, ADC buffer amplifiers, DAC I-V
conversion, and any other 2.7V-5V application requiring pre-
cision 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 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
60 µV
35nV/
130 dB
120 dB
130 dB
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
8-Pin MSOP
Top View
20071502
14-Pin TSSOP
Top View
20071542
Top View
14-Pin LLP
20071538
Top View
20071539
© 2004 National Semiconductor Corporation DS200715
Top View
20071541
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
20071524
Offset Voltage vs. Common Mode
20071525
Offset Voltage vs. Common Mode
20071535
Voltage Noise vs. Frequency
20071534
Input Bias Current vs. Common Mode
20071504
5
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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.
20071517
FIGURE 3.
20071504
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 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 1
kΩ can provide some protection against very large transients
or overloads, and will not increase the offset significantly.
20071518
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
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 (AV = 100) while keeping the worst case output shift
due to VOS 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.
11 www.national.com
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LMP2011.PDF ] | |
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