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參數(shù)資料
| 型號： | LMV7239 |
| 廠商： | National Semiconductor Corporation |
| 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： | 45ns，超低功耗，低電壓軌至軌輸入輸出比較器Open-Drain/Push-Pull |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 320K |
| 代理商： | LMV7239 |
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
10
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LMV7239M5 | 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 |
| LMV7239M5 | 制造商:Texas Instruments 功能描述:COMPARATOR RAIL/RAIL IP POWERWISE |
| LMV7239M5/NOPB | 功能描述:校驗器 IC Comp-45Ns 65Ua RRIO 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 |
| LMV7239M5/NOPB | 制造商:Texas Instruments 功能描述:Voltage Comparator IC |
| LMV7239M5NOPB | 制造商:Texas Instruments 功能描述:IC,VOLT COMPARATOR,SINGLE,TSOP,6PIN,PLASTIC,LEAD FREE |
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