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參數(shù)資料
| 型號： | LMV951MK |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | 1V, 2.7 MHz, Rail-to-Rail Input and Output Amplifier with Shutdown Option |
| 中文描述： | OP-AMP, 3000 uV OFFSET-MAX, 2.7 MHz BAND WIDTH, PDSO6 |
| 封裝： | SOT-23, 6 PIN |
| 文件頁數(shù)： | 14/17頁 |
| 文件大?。?/td> | 1147K |
| 代理商： | LMV951MK |
Application Information
CIRCUIT DESCRIPTION AND ADVANTAGE OF THE
LMV951
The LMV951 utilizes an internal voltage generator which
allows for rail to rail input and output operation from 1 to 3V
supplies. An internal switching frequency between 10 MHz
and 15 MHz is used for generating the internal voltages.
The bipolar input stage provides rail to rail input operation
with no input bias current phase reversal and a constant
input offset voltage over the entire input common mode
range.
The CMOS output stage provides a gain that is virtually
independent of resistive loads and an output drive current in
excess of 35 mA at 1V. A further benefit of the output stage
is that the LMV951 is stable in positive unity gain at capaci-
tive loads in excess of 1000 pF.
Battery Operated Systems
The maximum operating voltage is 3V and the operating
characteristics are guaranteed down to 1V which makes the
LMV951 an excellent choice for battery operated systems
using one or two NiCd or NiMH cells. The LMV951 is also
functional at 0.9V making it an appropriate choice for a
single cell alkaline battery.
Shutdown Capability
While in shutdown mode, the LMV951 typically consumes
less than 50 nA of supply current making it ideal for power
conscious applications. Full functionality is restored within 3
μs of enable.
Small Size
The small footprint of the LMV951 package is ideal for high
density board systems. By using the small 6-Pin SOT23
package, the amplifier can be placed closer to the signal
source, reducing noise pickup and increasing signal integrity.
Power Supply Bypassing
As in any high performance IC, proper power supply bypass-
ing is necessary for optimizing the performance of the
LMV951. The internal voltage generator needs proper by-
passing for optimum operation. A surface mount ceramic .01
μF capacitor must be located as close as possible to the V
+
and V
pins (pins 2 and 6). This capacitor needs to have low
ESR and a self resonant frequency above 15 MHz. A small
tantalum or electrolytic capacitor with a value between 1 μF
and 10 μF also needs to be located close to the LMV951.
DRIVING CAPACITIVE LOAD
The unity gain follower is the most sensitive op amp configu-
ration to capacitive loading; the LMV951 can drive up to
10,000 pF in this configuration without oscillation. If the
application requires a phase margin greater than those
shown in the datasheet graphs, a snubber network is rec-
ommended. The snubber offers the advantage of reducing
the output signal ringing while maintaining the output swing
which ensures a wider dynamic range; this is especially
important at lower supply voltages.
The chart below gives recommended values for some com-
mon values of large capacitors. For these values R
L
= 2 k
;
C
L
R
S
330
270
220
C
S
500 pF
680 pF
1000 pF
6800 pF
8200 pF
.015 μF
20123156
FIGURE 1. Snubber Network to Improve Phase Margin
20123160
FIGURE 2. 1000 pF and no Snubber
20123161
FIGURE 3. 1000 pF with Snubber
L
www.national.com
14
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMV951MK/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 |
| LMV951MK/NOPB | 制造商:Texas Instruments 功能描述:IC, OP-AMP, 2.8MHZ, 1.4V/ us, SOT-23-6 |
| LMV951MKX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:1V, 2.7 MHz, Rail-to-Rail Input and Output Amplifier with Shutdown Option |
| LMV951MKX/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 |
| LMV981 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1.8-V OPERATIONAL AMPLIFIERS WITH RAIL-TO-RAIL AND OUTPUT AND SHUTDOWN |
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