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| 型號(hào)： | LMV821M7X/NOPB |
| 廠(chǎng)商： | National Semiconductor |
| 文件頁(yè)數(shù)： | 6/38頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC OP AMP RRO 5MHZ SC-70-5 |
| 標(biāo)準(zhǔn)包裝： | 3,000 |
| 放大器類(lèi)型： | 通用 |
| 電路數(shù)： | 1 |
| 輸出類(lèi)型： | 滿(mǎn)擺幅 |
| 轉(zhuǎn)換速率： | 2 V/µs |
| 增益帶寬積： | 5.6MHz |
| 電流 - 輸入偏壓： | 100nA |
| 電壓 - 輸入偏移： | 3500µV |
| 電流 - 電源： | 300µA |
| 電流 - 輸出 / 通道： | 45mA |
| 電壓 - 電源，單路/雙路(±)： | 2.5 V ~ 5.5 V，±1.25 V ~ 2.75 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 6-TSSOP（5 引線(xiàn)），SC-88A，SOT-353 |
| 供應(yīng)商設(shè)備封裝： | SC-70-5 |
| 包裝： | 帶卷 (TR) |
| 其它名稱(chēng)： | *LMV821M7X *LMV821M7X/NOPB LMV821M7X LMV821M7X-ND LMV821M7X/NOPBTR |
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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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMV821-N | 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:LMV821-N/LMV822-N/LMV822-N-Q1/LMV824/LMV824-N-Q1 Single/Dual/Quad Low Voltage |
| LMV821-Q1 | 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:LOW-VOLTAGE RAIL-TO-RAIL OUTPUT OPERATIONAL AMPLIFIERS |
| LMV821QDBVRQ1 | 功能描述:運(yùn)算放大器 - 運(yùn)放 Auto Cat Sgl Low Vltg Low Pwr RRO 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 |
| LMV821SQ3T2G | 功能描述:運(yùn)算放大器 - 運(yùn)放 LOW VOLTAGE SINGLE OP AMP 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 |
| LMV822 | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Low Voltage, Low Power, R-to-R Output, 5 MHz Op Amps |
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