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參數(shù)資料
| 型號： | LMV7239M7X |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 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 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大小： | 320K |
| 代理商： | LMV7239M7X |
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 |
|---|---|
| LMV7239M7X/NOPB | 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(bǔ)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 |
| 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 類型:通用 元件數(shù):1 輸出類型:開漏極，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: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:校驗器 IC 45nsec Lo Pwr-Vtg R-R Input Comparator 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: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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