LM6132AIMX National Semiconductor, LM6132AIMX Datasheet - Page 12

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LM6132AIMX

Manufacturer Part Number
LM6132AIMX
Description
IC,Operational Amplifier,DUAL,BIPOLAR,SOP,8PIN,PLASTIC
Manufacturer
National Semiconductor
Datasheets

Specifications of LM6132AIMX

Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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LM6132/34 Application Information
Figure 6 shows a method for compensating for load capaci-
tance (C
(Continued)
O
) effects by adding both an isolation resistor R
FIGURE 3.
FIGURE 4.
FIGURE 5.
01234943
01234945
01234942
O
at
12
the output and a feedback capacitor C
output and the inverting input pin. Feedback capacitor C
compensates for the pole introduced by R
mizing ringing in the output waveform while the feedback
resistor R
R
of R
Typical Applications
3 OP AMP INSTRUMENTATION AMP WITH
RAIL-TO-RAIL INPUT AND OUTPUT
Using the LM6134, a 3 op amp instrumentation amplifier with
rail-to-rail inputs and rail to rail output can be made. These
features make these instrumentation amplifiers ideal for
single supply systems.
Some manufacturers use a precision voltage divider array of
5 resistors to divide the common-mode voltage to get an
input range of rail-to-rail or greater. The problem with this
method is that it also divides the signal, so to even get unity
gain, the amplifier must be run at high closed loop gains.
This raises the noise and drift by the internal gain factor and
lowers the input impedance. Any mismatch in these preci-
sion resistors reduces the CMR as well. Using the LM6134,
all of these problems are eliminated.
In this example, amplifiers A and B act as buffers to the
differential stage (Figure 7). These buffers assure that the
input impedance is over 100 MΩ and they eliminate the
requirement for precision matched resistors in the input
stage. They also assure that the difference amp is driven
from a voltage source. This is necessary to maintain the
CMR set by the matching of R1–R2 with R3–R4.
O
. Depending on the size of the load capacitance, the value
O
is typically chosen to be between 100Ω to 1 kΩ.
F
compensates for dc inaccuracies introduced by
FIGURE 6.
FIGURE 7.
F
directly between the
O
and C
01234937
O
01234944
, mini-
F

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