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參數(shù)資料
| 型號(hào)： | LMV854 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 8 MHz Low Power CMOS, EMI Hardened Operational Amplifiers |
| 中文描述： | 8 MHz低功耗CMOS，運(yùn)算放大器的EMI硬化 |
| 文件頁數(shù)： | 14/22頁 |
| 文件大?。?/td> | 994K |
| 代理商： | LMV854 |
Application Information
INTRODUCTION
The LMV851/LMV852/LMV854 are operational amplifiers
with very good specifications, such as low offset, low noise
and a rail-to-rail output. These specifications make the
LMV851/LMV852/LMV854 great choices to use in areas such
as medical and instrumentation. The low supply current is
perfect for battery powered equipment. The small packages,
SC-70 package for the LMV851, the MSOP package for the
dual LMV852 and the TSSOP package for the quad LMV854,
make any of these parts a perfect choice for portable elec-
tronics. Additionally, the EMI hardening makes the LMV851/
LMV852 or LMV854 a must for almost all op amp applications.
Most applications are exposed to Radio Frequency (RF) sig-
nals such as the signals transmitted by mobile phones or
wireless computer peripherals. The LMV851/LMV852/
LMV854 will effectively reduce disturbances caused by RF
signals to a level that will be hardly noticeable. This again
reduces the need for additional filtering and shielding. Using
this EMI resistant series of op amps will thus reduce the num-
ber of components and space needed for applications that are
affected by EMI, and will help applications, not yet identified
as possible EMI sensitive, to be more robust for EMI.
INPUT CHARACTERISTICS
The input common mode voltage range of the LMV851/
LMV852/LMV854 includes ground, and can even sense well
below ground. The CMRR level does not degrade for input
levels up to 1.2V below the supply voltage. For a supply volt-
age of 5V, the maximum voltage that should be applied to the
input for best CMRR performance is thus 3.8V.
When not configured as unity gain, this input limitation will
usually not degrade the effective signal range. The output is
rail-to-rail and therefore will introduce no limitations to the
signal range.
The typical offset is only 0.26 mV, and the TCV
OS
is
0.4 μ
V/°C, specifications close to precision op amps.
CMRR MEASUREMENT
The CMRR measurement results may need some clarifica-
tion. This is because different setups are used to measure the
AC CMRR and the DC CMRR.
The DC CMRR is derived from
Δ
V
versus
Δ
V
. This value
is stated in the tables, and is tested during production testing.
The AC CMRR is measured with the test circuit shown in
Figure 1
.
20202164
FIGURE 1. AC CMRR Measurement Setup
The configuration is largely the usually applied balanced con-
figuration. With potentiometer P1, the balance can be tuned
to compensate for the DC offset in the DUT. The main differ-
ence is the addition of the buffer. This buffer prevents the
open-loop output impedance of the DUT from affecting the
balance of the feedback network. Now the closed-loop output
impedance of the buffer is a part of the balance. But as the
closed-loop output impedance is much lower, and by careful
selection of the buffer also has a larger bandwidth, the total
effect is that the CMRR of the DUT can be measured much
more accurately. The differences are apparent in the larger
measured bandwidth of the AC CMRR.
One artifact from this test circuit is that the low frequency CM-
RR results appear higher than expected. This is because in
the AC CMRR test circuit the potentiometer is used to com-
pensate for the DC mismatches. So, mainly AC mismatch is
all that remains. Therefore, the obtained DC CMRR from this
AC CMRR test circuit tends to be higher than the actual DC
CMRR based on DC measurements.
The CMRR curve in
Figure 2
shows a combination of the AC
CMRR and the DC CMRR.
20202136
FIGURE 2. CMRR Curve
www.national.com
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| LMV854MTX | 8 MHz Low Power CMOS, EMI Hardened Operational Amplifiers |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMV854EVAL | 功能描述:放大器 IC 開發(fā)工具 LMV854 EVAL BOARD RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V |
| LMV854MT | 制造商:Texas Instruments 功能描述:OP Amp Quad GP R-R O/P 5.5V 14-Pin TSSOP Rail 制造商:Texas Instruments 功能描述:Op Amp, Quad 8 MHz, LMV854MT |
| LMV854MT/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV854MTX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:8 MHz Low Power CMOS, EMI Hardened Operational Amplifiers |
| LMV854MTX/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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