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參數(shù)資料
| 型號： | LM7301IMX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | Low Power, 4 MHz GBW, Rail-to-Rail Input-Output Operational Amplifier in TinyPak⑩ Package |
| 中文描述： | OP-AMP, 8000 uV OFFSET-MAX, 4 MHz BAND WIDTH, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大小： | 263K |
| 代理商： | LM7301IMX |
Applications Information
(Continued)
POWER DISSIPATION
Although the LM7301 has internal output current limiting,
shorting the output to ground when operating on a +30V
power supply will cause the opamp to dissipate about
350 mW. This is a worst-case example. In the SO-8 pack-
age, this will cause a temperature rise of 58C. In the
SOT23-5 package, the higher thermal resistance will cause
a calculated rise of 113C. This can raise the junction tem-
perature to above the absolute maximum temperature of
150C.
Operating from split supplies greatly reduces the power dis-
sipated when the output is shorted. Operating on
±
15V sup-
plies can only cause a temperature rise of 29C in the SO-8
and 57C in the SOT23-5 package, assuming the short is to
ground.
SPICE Macromodel
A SPICE macromodel for this and many other National
Semiconductor operational amplifiers is available, at no
charge, from the NSC Customer Support Center at
800-272-9959 or on the World Wide Web at http://
www.national.com/models.
WIDE SUPPLY RANGE
The
high
common-mode rejection ratio (CMRR) provide precision per-
formance when operated on battery or other unregulated
supplies. This advantage is further enhanced by the very
wide supply range (2.2V–30V, guaranteed) offered by the
LM7301. In situations where highly variable or unregulated
supplies are present, the excellent PSRR and wide supply
range of the LM7301 benefit the system designer with con-
tinued precision performance, even in such adverse supply
conditions.
power-supply
rejection
ratio
(PSRR)
and
SPECIFIC ADVANTAGES OF SOT23-5 (TinyPak)
The obvious advantage of the SOT23-5, TinyPak, is that it
can save board space, a critical aspect of any portable or
miniaturized system design. The need to decrease overall
system size is inherent in any handheld, portable, or light-
weight system application.
Furthermore, the low profile can help in height limited de-
signs, such as consumer hand-held remote controls,
sub-notebook computers, and PCMCIA cards.
An additional advantage of the tiny package is that it allows
better system performance due to ease of package place-
ment. Because the tiny package is so small, it can fit on the
board right where the opamp needs to be placed for optimal
performance, unconstrained by the usual space limitations.
This optimal placement of the tiny package allows for many
system enhancements, not easily achieved with the con-
straints of a larger package. For example, problems such as
system noise due to undesired pickup of digital signals can
be easily reduced or mitigated. This pick-up problem is often
caused by long wires in the board layout going to or from an
opamp. By placing the tiny package closer to the signal
source and allowing the LM7301 output to drive the long
wire, the signal becomes less sensitive to such pick-up. An
overall reduction of system noise results.
Often times system designers try to save space by using
dual or quad opamps in their board layouts. This causes a
complicated board layout due to the requirement of routing
several signals to and from the same place on the board. Us-
ing the tiny opamp eliminates this problem.
Additional space savings parts are available in tiny packages
from National Semiconductor, including low power amplifi-
ers, precision voltage references, and voltage regulators.
LOW DISTORTION, HIGH OUTPUT
DRIVE CAPABILITY
The LM7301 offers superior low-distortion performance, with
a total-harmonic-distortion-plus-noise of 0.06% at f = 10
kHz. The advantage offered by the LM7301 is its low distor-
tion levels, even at high output current and low load resis-
tance.
Typical Applications
HANDHELD REMOTE CONTROLS
The LM7301 offers outstanding specifications for applica-
tions requiring good speed/power trade-off. In applications
such as remote control operation, where high bandwidth and
low power consumption are needed. The LM7301 perfor-
mance can easily meet these requirements.
OPTICAL LINE ISOLATION FOR MODEMS
The combination of the low distortion and good load driving
capabilities of the LM7301 make it an excellent choice for
driving opto-coupler circuits to achieve line isolation for mo-
dems. This technique prevents telephone line noise from
coupling onto the modem signal. Superior isolation is
achieved by coupling the signal optically from the computer
modem to the telephone lines; however, this also requires a
low distortion at relatively high currents. Due to its low distor-
tion at high output drive currents, the LM7301 fulfills this
need, in this and in other telecom applications.
DS012842-20
FIGURE 5.
DS012842-21
FIGURE 6.
www.national.com
8
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM7301IMX/E2000008 | 制造商:Texas Instruments 功能描述: |
| LM7301IMX/E7002184 | 制造商:Texas Instruments 功能描述: |
| LM7301IMX/NOPB | 功能描述:運算放大器 - 運放 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 |
| LM7301M/NOPB | 制造商:Texas Instruments 功能描述: |
| LM730Z | 制造商:SEOUL 制造商全稱:Seoul Semiconductor 功能描述:GREEN OVAL LAMP LED |
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