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參數(shù)資料
| 型號： | LMV7239M5 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 比較器 |
| 英文描述： | DIODE ZENER SINGLE 200mW 11Vz 20mA-Izt 0.05 2uA-Ir 8.4 SOT-323 3K/REEL |
| 中文描述： | COMPARATOR, 8000 uV OFFSET-MAX, 68 ns RESPONSE TIME, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 320K |
| 代理商： | LMV7239M5 |
Application Section
(Continued)
Non-Inverting Comparator with Hysteresis
A non inverting comparator with hysteresis requires a two
resistor network, and a voltage reference (V
) at the in-
verting input. When V
is low, the output is also low. For the
output to switch from low to high, V
IN
must rise up to V
IN1
where V
IN1
is calculated by.
V
IN1
= R1*(V
REF
/R2) + V
REF
When V
is high, the output is also high, to make the
comparator switch back to it’s low state, V
must equal V
before V
A
will again equal V
REF
. V
IN
can be calculated by
V
IN2
= (V
REF
(R1+ R2) - V
CC
R1)/R2
The hysteresis of this circuit is the difference between V
IN1
and V
IN2
.
Delta V
IN
= V
CC
R1/R2
Circuit Layout and Bypassing
The LMV7235/39 require high speed layout. Follow these
layout guidelines:
1. Use printed circuit board with a good, unbroken low-
inductance ground plane.
2. Place a decoupling capacitor (0.1μF ceramic surface
mount capacitor) as close as possible to V
CC
pin.
3. On the inputs and the output, keep lead lengths as short
as possible to avoid unwanted parasitic feedback around the
comparator. Keep inputs away from output.
4. Solder the device directly to the printed circuit board rather
than using a socket.
5. For slow moving input signals, take care to prevent para-
sitic feedback. A small capacitor (1000pF or less) placed
between the inputs can help eliminate oscillations in the
transition region. This capacitor causes some degradation to
t
PD
when the source impedance is low.
6. The topside ground plane runs between the output and
inputs.
7. Ground trace from the ground pin runs under the device
up to the bypass capacitor, shielding the inputs from the
outputs.
10135919
FIGURE 1.
10135924
10135920
FIGURE 2. Non-Inverting Comparator with Hysteresis
L
www.national.com
9
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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(yīng)時間: 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 |
| 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 |
| LMV7239M5-NOPB | 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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