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參數(shù)資料
| 型號(hào)： | LMV7291MGX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 比較器 |
| 英文描述： | Single 1.8V Low Power Comparator with Rail-to-Rail Input |
| 中文描述： | COMPARATOR, 6000 uV OFFSET-MAX, PDSO5 |
| 封裝： | SC-70, 5 PIN |
| 文件頁數(shù)： | 13/14頁 |
| 文件大小： | 400K |
| 代理商： | LMV7291MGX |
Typical Applications
(Continued)
SQUARE WAVE GENERATOR
A typical application for a comparator is as a square wave
oscillator. The circuit below generates a square wave whose
period is set by the RC time constant of the capacitor C
and
resistor R
. The maximum frequency is limited by the large
signal propagation delay of the comparator, and by the ca-
pacitive loading at the output, which limits the output slew
rate.
To analyze the circuit, consider it when the output is high.
That implies that the inverted input (V
C
) is lower than the
non-inverting input (V
A
). This causes the C
1
to get charged
through R
4,
and the voltage V
C
increases till it is equal to the
non-inverting input. The value of V
A
at this point is
If R
1
= R
2
= R
3
then V
A1
= 2V
CC
/3
At this point the comparator switches pulling down the output
to the negative rail. The value of V
A
at this point is
If R
1
= R
2
= R
3
then V
A2
= V
CC
/3
The capacitor C
1
now discharges through R
4
, and the volt-
age V
C
decreases till it is equal to V
A2
, at which point the
comparator switches again, bringing it back to the initial
stage. The time period is equal to twice the time it takes to
discharge C
1
from 2V
CC
/3 to V
CC
/3, which is given by
R
4
C
1
.ln2. Hence the formula for the frequency is:
F = 1/(2.R
4
.C
1
.ln2)
20080055
FIGURE 6. Negative Peak Detector
20080056
20080057
FIGURE 7. Squarewave Oscillator
L
www.national.com
13
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMV7291MGX/NOPB | 功能描述:校驗(yàn)器 IC RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時(shí)間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| LMV751 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Noise, Low Vos, Single Op Amp |
| LMV751M5 | 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 |
| LMV751M5/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 Ultra Low Noise Sgl 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 |
| LMV751M5/NOPB | 制造商:Texas Instruments 功能描述:Operational Amplifier (Op-Amp) IC |
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