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參數資料
| 型號： | LMV821M7X |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運算放大器 |
| 英文描述： | Low Voltage, Low Power, R-to-R Output, 5 MHz Op Amps |
| 中文描述： | OP-AMP, 3500 uV OFFSET-MAX, 5 MHz BAND WIDTH, PDSO5 |
| 封裝： | SC-70, 5 PIN |
| 文件頁數： | 15/24頁 |
| 文件大小： | 1068K |
| 代理商： | LMV821M7X |
2.5 Tri-level Voltage Detector
The tri-level voltage detector of Figure 13 provides a type of
window comparator function. It detects three different input
voltage ranges: Min-range, Mid-range, and Max-range. The
output voltage (V
) is at V
for the Min-range. V
O
is
clamped at GND for the Mid-range. For the Max-range, V
is
at V
. Figure 14 shows a V
O
vs. V
I
oscilloscope photo per
the circuit of Figure 13
Its operation is as follows: V
I
deviating from GND, causes
the diode bridge to absorb I
IN
to maintain a clamped condi-
tion (V
= 0V). Eventually, I
reaches the bias limit of the di-
ode bridge. When this limit is reached, the clamping effect
stops and the op amp responds open loop. The design equa-
tion directly preceding Figure 14 shows how to determine
the clamping range. The equation solves for the input volt-
age band on each side GND. The mid-range is twice this
voltage band.
DS100128-89
DS100128-34
FIGURE 13. Tri-level Voltage Detector
OV
-VIN
+VIN
-
+
OV
|
v |
v |
DS100128-35
FIGURE 14. X, Y Oscilloscope Trace showing V
OUT
vs
V
IN
per the Circuit of
Figure 13
www.national.com
15
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LMV821M7X/NOPB | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV821M7XNOPB | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LMV821-N/LMV822-N/LMV822-N-Q1/LMV824/LMV824-N-Q1 Single/Dual/Quad Low Voltage |
| LMV821-N | 制造商:TI 制造商全稱: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:Texas Instruments 功能描述:LOW-VOLTAGE RAIL-TO-RAIL OUTPUT OPERATIONAL AMPLIFIERS |
| LMV821QDBVRQ1 | 功能描述:運算放大器 - 運放 Auto Cat Sgl Low Vltg Low Pwr RRO RoHS:否 制造商:STMicroelectronics 通道數量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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