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參數(shù)資料
| 型號： | LMV7239M7 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 比較器 |
| 英文描述： | DIODE ZENER SINGLE 350mW 12Vz 20mA-Izt 0.05 1uA-Ir 9.1 SOT-23 3K/REEL |
| 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)： | 8/12頁 |
| 文件大?。?/td> | 320K |
| 代理商： | LMV7239M7 |
Typical Performance Characteristics
25C). (Continued)
(Unless otherwise specified, V
S
= 5V, C
L
= 10pF, T
A
=
Propagation Delay vs. Common Mode Voltage
Propagation Delay vs. Common Mode Voltage
10135916
10135917
Application Section
The LMV7235/LMV7239 are single supply comparators with
45ns of propagation delay and only 65μA of supply current.
The LMV7235/LMV7239 are rail-to-rail input and output. The
typical input common mode voltage range of 0.2V below
the ground to 0.2V above the supply. The LMV7235/39 use a
complimentary PNP and NPN input stage in which the PNP
stage senses common mode voltage near V
and the NPN
stage senses common mode voltage near V
+
. If either of the
input signals falls below the negative common mode limit,
the parasitic PN junction formed by the substrate and the
base of the PNP will turn on resulting in an increase of input
bias current.
If one of the input goes above the positive common mode
limit, the output will still maintain the correct logic level as
long as the other input stays within the common mode range.
However, the propagation delay will increase. When both
inputs are outside the common mode voltage range, current
saturation occurs in the input stage, and the output becomes
unpredictable.
The propagation delay does not increase significantly with
large differential input voltages. However, large differential
voltages greater than the supply voltage should be avoided
to prevent damage to the input stage.
The LMV7239 has a push-pull output. When the output
switches, there is a direct path between V
CC
and ground,
causing high output sinking or sourcing current during the
transition. After the transition, the output current decreases
and the supply current settles back to about 65μAat 5V, thus
conserving power consumption.
The LMV7235 has an open drain that requires a pull-up
resistor to a positive supply voltage for the output to switch
properly. When the internal output transistor is off, the output
voltage will be pulled up to the external positive voltage.
Comparator with Hysteresis
The basic comparator configuration may oscillate or produce
a noisy output if the applied differential input voltage is near
the comparator’s offset voltage. This usually happens when
the input signal is moving very slowly across the compara-
tor’s switching threshold. This problem can be prevented by
the addition of hysteresis or positive feedback.
Inverting Comparator with Hysteresis
The inverting comparator with hysteresis requires a three
resistor network that is referenced to the supply voltage V
of the comparator. When V
at the inverting input is less
than V
, the voltage at the non-inverting node of the com-
parator (V
IN
<
V
), the output voltage is high (for simplicity
assume V
switches as high as V
). The three network
resistors can be represented as R1//R3 in series with R2.
The lower input trip voltage V
A1
is defined as
V
A1
= V
CC
R2 / ((R1//R3) + R2)
When V
is greater than V
(V
>
V
), the output voltage is
low, very close to ground. In this case the three network
resistors can be presented as R2//R3 in series with R1. The
upper trip voltage V
A2
is defined as
V
A2
= V
CC
(R2//R3) / ((R1+ (R2//R3)
The total hysteresis provided by the network is defined as
Delta V
A
= V
A1
- V
A2
To assure that the comparator will always switch fully to V
CC
and not be pulled down by the load the resistors, values
should be chosen as follow:
R
PULL-UP
<<
R
LOAD
L
www.national.com
8
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMV7239M7/NOPB | 功能描述:校驗(yàn)器 IC 45 NSEC, ULT LOW PWR LOW VLTG, RRI CMPRTR 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(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 |
| LMV7239M7/NOPB | 制造商:Texas Instruments 功能描述:Voltage Comparator IC |
| LMV7239M7NOPB | 制造商:Texas Instruments 功能描述: |
| LMV7239M7X | 功能描述:校驗(yàn)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(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 |
| LMV7239M7X/NOPB | 功能描述:校驗(yàn)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(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 |
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