参数资料
| 型号： | LMV821M5 |
| 厂商： | National Semiconductor |
| 文件页数： | 6/38页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP R-R LOW V LP SOT23-5 |
| RoHS指令信息： | LMV821M5 Material |
| 标准包装： | 1 |
| 放大器类型： | 通用 |
| 电路数： | 1 |
| 输出类型： | 满摆幅 |
| 转换速率： | 2 V/µs |
| 增益带宽积： | 5.6MHz |
| 电流 - 输入偏压： | 100nA |
| 电压 - 输入偏移： | 3500µV |
| 电流 - 电源： | 300µA |
| 电流 - 输出 / 通道： | 45mA |
| 电压 - 电源，单路/双路(±)： | 2.5 V ~ 5.5 V，±1.25 V ~ 2.75 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 标准包装 |
| 产品目录页面： | 1269 (CN2011-ZH PDF) |
| 其它名称： | LMV821M5DKR |
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SNOS032G – AUGUST 1999 – REVISED NOVEMBER 2013
APPLICATION NOTE
This application note is divided into two sections: design considerations and Application Circuits.
DESIGN CONSIDERATIONS
This section covers the following design considerations:
1. Frequency and Phase Response Considerations
2. Unity-Gain Pulse Response Considerations
3. Input Bias Current Considerations
FREQUENCY AND PHASE RESPONSE CONSIDERATIONS
The relationship between open-loop frequency response and open-loop phase response determines the closed-
loop stability performance (negative feedback). The open-loop phase response causes the feedback signal to
shift towards becoming positive feedback, thus becoming unstable. The further the output phase angle is from
the input phase angle, the more stable the negative feedback will operate. Phase Margin (
φm) specifies this
output-to-input phase relationship at the unity-gain crossover point. Zero degrees of phase-margin means that
the input and output are completely in phase with each other and will sustain oscillation at the unity-gain
frequency.
The AC tables show
φm for a no load condition. But φm changes with load. The Gain and Phase margin vs
Frequency plots in the curve section can be used to graphically determine the
φm for various loaded conditions.
To do this, examine the phase angle portion of the plot, find the phase margin point at the unity-gain frequency,
and determine how far this point is from zero degree of phase-margin. The larger the phase-margin, the more
stable the circuit operation.
The bandwidth is also affected by load. The graphs of Figure 32 and Figure 33 provide a quick look at how
various loads affect the
φm and the bandwidth of the LMV821/822/824 family. These graphs show capacitive
loads reducing both
φm and bandwidth, while resistive loads reduce the bandwidth but increase the φm. Notice
how a 600
resistor can be added in parallel with 220 picofarads capacitance, to increase the φm 20°(approx.),
but at the price of about a 100 kHz of bandwidth.
Overall, the LMV821/822/824 family provides good stability for loaded condition.
Figure 32. Phase Margin vs Common Mode Voltage for Various Loads
14
Copyright 1999–2013, Texas Instruments Incorporated
相关PDF资料 |
PDF描述 |
|---|---|
| 2-640388-3 | CONN HEADER 23POS VERT .156 TIN |
| 929836-01-27-RK | CONN HEADER 54POS DUAL .100 TIN |
| 9-146257-0-10 | CONN HEADR BRKWAY .100 20POS STR |
| 9-103329-0-32 | CONN HEADR BRKWAY .100 32POS R/A |
| 1-1318300-9 | CONN HEADER .156 VERT 9POS TIN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LMV821M5/NOPB | 功能描述:运算放大器 - 运放 Low Volt Sgl Op Amp RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| LMV821M5/NOPB | 制造商:Texas Instruments 功能描述:Operational Amplifier (Op-Amp) IC |
| LMV821M5NOPB | 制造商:Texas Instruments 功能描述: |
| LMV821M5X | 功能描述:运算放大器 - 运放 RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| LMV821M5X/NOPB | 功能描述:运算放大器 - 运放 RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
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