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參數(shù)資料
| 型號： | LMV7219M5 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | 7 nsec, 2.7V to 5V Comparator with Rail-to Rail Output |
| 中文描述： | COMPARATOR, 8000 uV OFFSET-MAX, 12 ns RESPONSE TIME, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 282K |
| 代理商： | LMV7219M5 |
Typical Performance Characteristics
Unless otherwise specified, V
S
= 5V, C
L
= 10pF, T
A
=
25C (Continued)
Application Section
LMV7219 is a single supply comparator with internal hyster-
esis, 7ns of propagation delay and only 1.1mA of supply cur-
rent.
The LMV7219 has a typical input common mode voltage
range of 0.2V below the ground to 1V below V
. The differ-
ential input stage is a pair of PNP transistors, therefore, the
input bias current flows out of the device. 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 inputs 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 in-
puts 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 damages to the input stage.
The LMV7219 has a push pull output. When the output
switches, there is a direct path between V
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 1.1mA at 5V,
thus conserving power consumption.
Most high-speed comparators oscillate when the voltage of
one of the inputs is close to or equal to the voltage on the
other input due to noise or undesirable feedback. The
LMV7219 have 7mV of internal hysteresis to counter para-
sitic effects and noise. The hysteresis does not change sig-
nificantly with the supply voltages and the common mode in-
put voltages as reflected in the specification table.
The internal hysteresis creates two trip points, one for the
rising input voltage and one for the falling input voltage. The
difference between the trip points is the hysteresis. With in-
ternal hysteresis, when the comparator’s input voltages are
equal, the hysteresis effectively causes one comparator-
input voltage to move quickly past the other, thus taking the
input out of the region where oscillation occurs. Standard
comparators require hysteresis to be added with external re-
sistors. The fixed internal hysteresis eliminates these
resistors.
Additional Hysteresis
If additional hysteresis is desired, this can be done with the
addition of three resistors using positive feedback, as shown
in Figure 2 The positive feedback method slows the com-
parator response time. Calculate the resistor values as fol-
lows:
1) Select R3. The current through R3 should be greater than
the input bias current to minimize errors. The current through
R3 (I
) at the trip point is (V
- V
) /R3. Consider the two
possible output states when solving for R3, and use the
smaller of the two resulting resistor values. The two formulas
are:
R3 = V
REF
/I
F
(when V
OUT
= 0)
R3 = V
CC
- V
REF
/I
F
(V
OUT
= V
CC
)
2) Choose a hysteresis band required (V
HB
).
3) Calculate R1, where R1 = R3 X(V
HB
/V
CC
)
4) Choose the trip point for V
rising. This is the threshold
voltage (V
THR
) at which the comparator switches from low to
high as V
IN
rises about the trip point.
5) Calculate R2 as follows:
6) Verify the trip voltage and hysteresis as follows:
Propagation Delay (t
PD
+
)
DS101054-17
DS101054-18
FIGURE 1. Input and Output Waveforms, Non-Inverting
Input Varied
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 |
|---|---|
| LMV7219M5 | 制造商:Texas Instruments 功能描述:COMPARATOR RAIL/RAIL OP POWERWISE |
| LMV7219M5/NOPB | 功能描述:校驗器 IC 2.7V-5V Comp W/Rr Out 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 |
| LMV7219M5X | 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 |
| LMV7219M5X/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 |
| LMV7219M5X/S5000707 | 制造商:Texas Instruments 功能描述: |
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