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參數(shù)資料
| 型號： | 5962L0620601VZA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運算放大器 |
| 英文描述： | DUAL OP-AMP, 60 uV OFFSET-MAX, 3 MHz BAND WIDTH, CDSO10 |
| 封裝： | CERAMIC, SOIC-10 |
| 文件頁數(shù)： | 12/14頁 |
| 文件大?。?/td> | 365K |
| 代理商： | 5962L0620601VZA |
Application Information
THE BENEFITS OF LMP2012
NO 1/f NOISE
Using patented methods, the LMP2012 eliminates the 1/f
noise present in other amplifiers. That noise, which increases
as frequency decreases, is a major source of measurement
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 mea-
surement is made rapidly, this constantly-changing noise sig-
nal 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 1V/
. This is equiv-
alent to a 0.50 V peak-to-peak error, in the frequency range
0.001 Hz to 1.0 Hz. In a circuit with a gain of 1000, this pro-
duces 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
LMP2012 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 frequencies. 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 LMP2012 eliminates this source of error. The noise level
is constant with frequency so that reducing the bandwidth re-
duces the errors caused by noise.
OVERLOAD RECOVERY
The LMP2012 recovers from input overload much faster than
most chopper-stabilized op amps. Recovery from driving 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.
20182216
FIGURE 1.
The wide bandwidth of the LMP2012 enhances performance
when it is used as an amplifier to drive loads that inject tran-
sients back into the output. ADCs (Analog-to-Digital Convert-
ers) 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 re-
cover to 1% of the applied pulse is 80 ns. To recover to 0.1%
requires 860ns. This rapid recovery is due to the wide band-
width of the output stage and large total GBW.
NO EXTERNAL CAPACITORS REQUIRED
The LMP2012 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 LMP2012 offers the benefits mentioned above and more.
It has a rail-to-rail output and consumes only 950 A of supply
current while providing excellent DC and AC electrical per-
formance. In DC performance, the LMP2012 achieves 130 dB
of CMRR, 120 dB of PSRR and 130 dB of open loop gain. In
AC performance, the LMP2012 provides 3 MHz of gain-band-
width product and 4 V/s of slew rate.
HOW THE LMP2012 WORKS
The LMP2012 uses new, patented techniques to achieve the
high DC accuracy traditionally associated with chopper-sta-
bilized amplifiers without the major drawbacks produced by
chopping. The LMP2012 continuously monitors the input off-
set and corrects this error. The conventional chopping pro-
cess 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) chop-
per-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 LMP2012.
This data was taken under the exact same conditions. The
auto-zero action is visible at about 30 kHz but note the ab-
sence of mixing products at other frequencies. As a result, the
LMP2012 has very low distortion of 0.02% and very low mix-
ing products.
20182217
FIGURE 2.
7
www.national.com
LMP2012QML
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