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參數(shù)資料
| 型號(hào)： | LMV7239M7X |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 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(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 320K |
| 代理商： | LMV7239M7X |
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 |
|---|---|
| LMV7239M7X/NOPB | 功能描述:校驗(yàn)器 IC RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類(lèi)型: 通道數(shù)量: 輸出類(lèi)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 |
| 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(lèi)型:通用 元件數(shù):1 輸出類(lèi)型:開(kāi)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(lèi)型:表面貼裝 供應(yīng)商器件封裝:SOT-23-5 標(biāo)準(zhǔn)包裝:1 |
| LMV7239QM7 | 制造商:TI 制造商全稱(chēng):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(yàn)器 IC 45nsec Lo Pwr-Vtg R-R Input Comparator RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類(lèi)型: 通道數(shù)量: 輸出類(lèi)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 |
| LMV7239QM7X | 制造商:TI 制造商全稱(chēng):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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