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參數(shù)資料
| 型號： | LMP2014SDX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運算放大器 |
| 英文描述： | High Precision, Rail-to-Rail Output Operational Amplifier |
| 中文描述： | QUAD OP-AMP, 3 MHz BAND WIDTH, DSO14 |
| 封裝： | LLP-14 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 688K |
| 代理商： | LMP2014SDX |
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 50C) 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 = 2 Hz
This example will result in about 2.2 mV
(1.9 LSB) of
output noise contribution due to the op amp alone, com-
pared to about 594 μV
(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
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 anADC amplifier (
Figure 7
and
Figure
8
).
20071522
FIGURE 8.
L
www.national.com
13
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