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參數(shù)資料
| 型號： | LMV797MMX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | 17 MHz, Low Noise, CMOS Input, 1.8V Operational Amplifiers |
| 中文描述： | DUAL OP-AMP, 1350 uV OFFSET-MAX, 14 MHz BAND WIDTH, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數(shù)： | 17/19頁 |
| 文件大?。?/td> | 1152K |
| 代理商： | LMV797MMX |
Application Information
(Continued)
the other can be used for amplifying the output voltage to
further enhance the transimpedance gain. The wide band-
width of the op amps (17 MHz) ensures that they are capable
of providing high gain for a wide range of frequencies. The
low input referred noise (5.8 nV/
deliver an output with a high SNR (signal to noise ratio). The
small 8-pin MSOP footprint saves space on printed circuit
boards and allows ease of design in portable products.
The circuit shown in
Figure 13
, has the first op amp acting as
a transimpedance amplifier with a gain of 47000, while the
second stage provides a voltage gain of 10. This provides a
total transimpedance gain of 470000 with a 3 dB bandwidth
of about 1.5 MHz, for a total input capacitance of 50 pF. The
frequency response for the circuit is shown in
Figure 14
) allows the amplifier to
SENSOR INTERFACES
The low input bias current and low input referred noise of the
LMV796 and LMV797 make them ideal for sensor interfaces.
These circuits are required to sense voltages of the order of
a few μV and currents amounting to less than a nA hence,
the op amp needs to have low voltage noise and low input
bias current. Typical applications include infra-red (IR) ther-
mometry, thermocouple amplifiers and pH electrode buffers.
Figure 15
is an example of a typical circuit used for measur-
ing IR radiation intensity, often used for estimating the tem-
perature of an object from a distance. The IR sensor gener-
ates a voltage proportional to I, which is the intensity of the
IR radiation falling on it. As shown in
Figure 15
, K is the
constant of proportionality relating the voltage across the IR
sensor (V
IN
) to the radiation intensity, I. The resistances R
A
and R
B
are selected to provide a high gain to amplify this
voltage, while C
F
is added to filter out the high frequency
noise.
20183586
FIGURE 13. 1.5 MHz Transimpedance Amplifier, with
A
TI
= 470000
20183579
FIGURE 14. 1.5 MHz Transimpedance Amplifier
Frequency Response
20183572
FIGURE 15. IR Radiation Sensor
L
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMV797MMX/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(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 |
| LMV8172 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Vertical Deflection Output Amplifier |
| LMV820AILT | 功能描述:運算放大器 - 運放 Low Power OP AMP 400uA 5V 50nA 5.5MHz 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(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 |
| LMV820ILT | 功能描述:運算放大器 - 運放 Low Power OP AMP 400uA 5V 50nA 5.5MHz 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(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 |
| LMV821 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Voltage, Low Power, R-to-R Output, 5 MHz Op Amps |
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