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参数资料
| 型号： | LMV2011MF |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 运算放大器 |
| 英文描述： | High Precision, Rail-to-Rail Output Operational Amplifier |
| 中文描述： | OP-AMP, 35 uV OFFSET-MAX, 3 MHz BAND WIDTH, PDSO5 |
| 封装： | SOT-23, 5-PIN |
| 文件页数： | 13/15页 |
| 文件大小： | 582K |
| 代理商： | LMV2011MF |
Application Information
(Continued)
LMV2011 AS ADC INPUT AMPLIFIER
The LMV2011 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
(1.4μs) allows 12 bit accuracy at 100KH
Z
or more sam-
pling rate.
C) No flicker (1/f) noise means unsurpassed data accuracy
over any measurement period of time, no matter how
long. Consider the following opamp performance, based
on a typical low-noise, high-performance commercially-
available device, for comparison:
Opamp flatband noise = 8nV/
1/f corner frequency = 100Hz
A
V
= 2000
Measurement time = 100 sec
Bandwidth = 2Hz
This example will result in about 2.2 mV
(1.9 LSB) of
output noise contribution due to the opamp alone, com-
pared to about 594μV
(less than 0.5 LSB) when that
opamp is replaced with the LMV2011 which has no 1/f
contribution. If the measurement time is increased from
100 seconds to 1 hour, the improvement realized by
using the LMV2011 would be a factor of about 4.8 times
(2.86mV
compared to 596μV when LMV2011 is used)
mainly because the LMV2011 accuracy is not compro-
mised 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 LMV2011" 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
LMV2011 used as an ADC amplifier (
Figure 7
and
Figure
8
).
20051522
FIGURE 8.
L
www.national.com
13
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相关代理商/技术参数 |
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|---|---|
| LMV2011MF/HFLF | 制造商:Texas Instruments 功能描述:AMPLIFIER -NON VMI |
| LMV2011MF/NOPB | 功能描述:运算放大器 - 运放 Sgl High Prec Rro Op amp RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| LMV2011MFX | 功能描述:运算放大器 - 运放 RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| LMV2011MFX/NOPB | 功能描述:运算放大器 - 运放 RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| LM-V210400 | 制造商:Spectrah Dynamics 功能描述:CLOSE FRAME LCD MONITOR, ALUMINUM, 10.4", VGA, RGB,400NITS, - Bulk |
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