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參數(shù)資料
| 型號： | LMV7239M7X |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 比較器 |
| 英文描述： | 45ns, Ultra Low Power, Low Voltage, Rail-to-Rail Input Comparator with Open-Drain/Push-Pull Output |
| 中文描述： | COMPARATOR, 8000 uV OFFSET-MAX, 68 ns RESPONSE TIME, PDSO5 |
| 封裝： | SC-70, 5 PIN |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 320K |
| 代理商： | LMV7239M7X |
Application Section
(Continued)
Zero-Crossing Detector
The inverting input is connected to ground and the non-
inverting input is connected to 100mVp-p signal. As the
signal at the non-inverting input crosses 0V, the compara-
tor’s output changes state.
Threshold Detector
Instead of tying the inverting input to 0V, the inverting input
can be tied to a reference voltage. The non-inverting input is
connected to the input. As the input passes the V
REF
thresh-
old, the comparator’s output changes state.
Crystal Oscillator
A simple crystal oscillator using the LMV7239 is shown
below. Resistors R1 and R2 set the bias point at the com-
parator’s non-inverting input. Resistors R3, R4 and C1 sets
the inverting input node at an appropriate DC average level
based on the output. The crystal’s path provides resonant
positive feedback and stable oscillation occurs. The output
duty cycle for this circuit is roughly 50%, but it is affected by
resistor tolerances and to a lesser extent by the comparator
offset.
IR Receiver
The LMV7239 is an ideal candidate to be used as an infrared
receiver. The infrared photo diode creates a current relative
to the amount of infrared light present. The current creates a
voltage across R
. When this voltage level cross the voltage
applied by the voltage divider to the inverting input, the
output transitions.
10135918
FIGURE 3. Zero-Crossing Detector
10135921
FIGURE 4. Threshold Detector
10135922
FIGURE 5. Crystal Oscillator
10135923
FIGURE 6. IR Receiver
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 |
|---|---|
| LMV7239M7X/NOPB | 功能描述:校驗器 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 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| LMV7239QDBVRQ1 | 功能描述:Comparator General Purpose Open Drain, Push-Pull SOT-23-5 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 類型:通用 元件數(shù):1 輸出類型:開漏極，推挽式 電壓 - 電源，單/雙（±）:2.7 V ~ 5.5 V 電壓 - 輸入失調(diào)（最大值）:8mV @ 5V 電流 - 輸入偏置（最大值）:600nA 電流 - 輸出（典型值）:- 電流 - 靜態(tài)（最大值）:95μA CMRR，PSRR（典型值）:67dB CMRR，85dB PSRR 傳播延遲（最大值）:75ns 滯后:- 工作溫度:-40°C ~ 125°C 封裝/外殼:SC-74A，SOT-753 安裝類型:表面貼裝 供應商器件封裝:SOT-23-5 標準包裝:1 |
| LMV7239QM7 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LMV7235/LMV7239/LMV7239Q 75 nsec, Ultra Low Power, Low Voltage, Rail-to-Rail Input Comparator with Open-Drain/Push-Pull Output |
| LMV7239QM7/NOPB | 功能描述:校驗器 IC 45nsec Lo Pwr-Vtg R-R Input Comparator 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 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| LMV7239QM7X | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LMV7235/LMV7239/LMV7239Q 75 nsec, Ultra Low Power, Low Voltage, Rail-to-Rail Input Comparator with Open-Drain/Push-Pull Output |
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