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參數(shù)資料
| 型號(hào)： | LMV793MF |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 88 MHz, Low Noise, 1.8V CMOS Input, Decompensated Operational Amplifiers |
| 中文描述： | OP-AMP, 1650 uV OFFSET-MAX, 88 MHz BAND WIDTH, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 12/22頁 |
| 文件大?。?/td> | 543K |
| 代理商： | LMV793MF |
Application Information
ADVANTAGES OF THE LMV793/LMV794
Wide Bandwidth at Low Supply Current
The LMV793/LMV794 are high performance op amps that
provide a GBW of 88 MHz with a gain of 10 while drawing a
low supply current of 1.15 mA. This makes them ideal for pro-
viding wideband amplification in data acquisition applications.
With the proper external compensation the LMV793/LMV794
can be operated at gains of ±1 and still maintain much faster
slew rates than comparable unity gain stable amplifiers. The
increase in bandwidth and slew rate is obtained without any
additional power consumption over the LMV796.
Low Input Referred Noise and Low Input Bias Current
The LMV793/LMV794 have a very low input referred voltage
noise density (5.8 nV/
at 1 kHz). A CMOS input stage en-
sures a small input bias current (100 fA) and low input referred
current noise (0.01 pA/
). This is very helpful in maintain-
ing signal integrity, and makes the LMV793/LMV794 ideal for
audio and sensor based applications.
Low Supply Voltage
The LMV793 and LMV794 have performance guaranteed at
2.5V and 5V supply. These parts are guaranteed to be oper-
ational at all supply voltages between 2.0V and 5.5V, for
ambient temperatures ranging from 40°C to 125°C, thus uti-
lizing the entire battery lifetime. The LMV793/LMV794 are
also guaranteed to be operational at 1.8V supply voltage, for
temperatures between 0°C and 125°C optimizing their usage
in low-voltage applications.
RRO and Ground Sensing
Rail-to-rail output swing provides the maximum possible dy-
namic range. This is particularly important when operating at
low supply voltages. An innovative positive feedback scheme
is used to boost the current drive capability of the output
stage. This allows the LMV793/LMV794 to source more than
40 mA of current at 1.8V supply. This also limits the perfor-
mance of these parts as comparators, and hence the usage
of the LMV793 and the LMV794 in an open-loop configuration
is not recommended. The input common-mode range in-
cludes the negative supply rail which allows direct sensing at
ground in single supply operation.
Small Size
The small footprint of the LMV793 and the LMV794 package
saves space on printed circuit boards, and enables the design
of smaller electronic products, such as cellular phones,
pagers, or other portable systems. Long traces between the
signal source and the op amp make the signal path more
susceptible to noise pick up.
The physically smaller LMV793/LMV794 packages, allow the
op amp to be placed closer to the signal source, thus reducing
noise pickup and maintaining signal integrity.
USING THE DECOMPENSATED LMV793
Advantages of Decompensated Op Amps
A unity gain stable op amp, which is fully compensated, is
designed to operate with good stability down to gains of ±1.
The large amount of compensation does provide an op amp
that is relatively easy to use; however, a decompensated op
amp is designed to maximize the bandwidth and slew rate
without any additional power consumption. This can be very
advantageous.
The LMV793/LMV794 require a gain of ±10 to be stable.
However, with an external compensation network (a simple
RC network) these parts can be stable with gains of ±1 and
still maintain the higher slew rate. Looking at the Bode plots
for the LMV793 and its closest equivalent unity gain stable op
amp, the LMV796, one can clearly see the increased band-
width of the LMV793. Both plots are taken with a parallel
combination of 20 pF and 10 k
for the output load.
20216322
FIGURE 1. LMV793 A
VOL
vs. Frequency
20216323
FIGURE 2. LMV796 A
VOL
vs. Frequency
Figure 1
shows the much larger 88 MHz bandwidth of the
LMV793 as compared to the 17 MHz bandwidth of the
LMV796 shown in
Figure 2
. The decompensated LMV793
has five times the bandwidth of the LMV796.
What is a Decompensated Op Amp
The differences between the unity gain stable op amp and the
decompensated op amp are shown in
Figure 3
. This Bode plot
assumes an ideal two pole system. The dominant pole of the
decompensated op amp is at a higher frequency, f
1
, as com-
pared to the unity-gain stable op amp which is at f
as shown
in
Figure 3
. This is done in order to increase the speed capa-
bility of the op amp while maintaining the same power dissi-
pation of the unity gain stable op amp. The LMV793/LMV794
have a dominant pole at 8.6 Hz. The unity gain stable
LMV796/LMV797 have their dominant pole at 1.6 Hz.
www.national.com
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相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LMV793MFX | 88 MHz, Low Noise, 1.8V CMOS Input, Decompensated Operational Amplifiers |
| LMV794 | 88 MHz, Low Noise, 1.8V CMOS Input, Decompensated Operational Amplifiers |
| LMV794MA | 88 MHz, Low Noise, 1.8V CMOS Input, Decompensated Operational Amplifiers |
| LMV794MAX | 88 MHz, Low Noise, 1.8V CMOS Input, Decompensated Operational Amplifiers |
| LMV794MM | 88 MHz, Low Noise, 1.8V CMOS Input, Decompensated Operational Amplifiers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMV793MF/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 |
| LMV793MFX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:88 MHz, Low Noise, 1.8V CMOS Input, Decompensated Operational Amplifiers |
| LMV793MFX/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 |
| LMV794 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:88 MHz, Low Noise, 1.8V CMOS Input, Decompensated Operational Amplifiers |
| LMV794MA | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:88 MHz, Low Noise, 1.8V CMOS Input, Decompensated Operational Amplifiers |
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