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參數資料
| 型號： | LMC7221AIM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | Tiny CMOS Comparator with Rail-To-Rail Input and Open Drain Output |
| 中文描述： | COMPARATOR, 8000 uV OFFSET-MAX, 7000 ns RESPONSE TIME, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數： | 8/12頁 |
| 文件大小： | 271K |
| 代理商： | LMC7221AIM |
Application Information
(Continued)
should reduce the effect of shorts. For outputs which send
signals off PC boards additional protection devices, such as
diodes to the supply rails, and varistors may be used.
5.0 Input Protection
If input signals are likely to exceed the common mode range
of the LMC7221, or it is likely that signals may be present
when power is off, damage to the LMC7221 may occur.
Large value (100 k
to M
) input resistors may reduce the
likelihood of damage by limiting the input currents. Since the
LMC7221 has very low input leakage currents, the effect on
accuracy will be small. Additional protection may require the
use of diodes, as shown in Figure 3 Note that diode leakage
current may affect accuracy during normal operation.
The R-C time constant of R
IN
and the diode capacitance may
also slow response time.
6.0 Layout Considerations
The LMC7221 is not an especially fast comparator, so high
speed design practices are not required. The LMC7221 is
capable of operating with very high impedance inputs, so
precautions should be taken to reduce noise pickup with
high impedance (
～
100 k
and greater) designs and in elec-
trically noisy environments.
Keeping high value resistors close to the LMC7221 and mini-
mizing the size of the input nodes is a good practice. With
multilayer designs, try to avoid long loops which could act as
inductors (coils). Sensors which are not close to the com-
parator may need twisted pair or shielded connections to re-
duce noise.
7.0 Push-Pull Outputs, Dual Versions
The LMC7211 is a comparator similar to the LMC7221, but
with push-pull outputs which can source current.
The performance of the LMC7221 is available in a dual de-
vice. Please see the LMC6772 datasheet. For a dual device
with push-pull outputs, please see the LMC6762 datasheet.
Rail-to-Rail Input Low Power Comparators—
Push-Pull Output
SOT23-5, SO-8
SO-8, DIP
LMC7221
LMC6762
Single
Dual
Open Drain Output
LMC7221
LMC6772
SOT23-5, SO-8
SO-8, DIP
Single
Dual
8.0 Additional SOT23-5 Tiny Devices
National Semiconductor has additional parts available in the
space saving SOT23 Tiny package, including amplifiers,
voltage references, and voltage regulators. These devices
include—
LMC7101
1 MHz gain-bandwidth rail-to-rail input and out-
put amplifier— high input impedance and high
gain 700 μA typical current 2.7V, 3V, 5V and 15V
specifications.
LMC7111
Low power 50 kHz gain-bandwidth rail-to-rail in-
put and output amplifier with 25 μA typical cur-
rent specified at 2.7V, 3.0V, 3.3V, 5V and 10V.
LM7131
Tiny Video amp with 70 MHz gain bandwidth 3V,
5V and
±
5V specifications.
LP2980
Micropower SOT 50 mA Ultra Low-Dropout
Regulator.
LM4040
Precision micropower shunt voltage reference.
Fixed voltages of 2.500V, 4.096V, 5.000V,
8.192V and 10.000V.
LM4041
Precision micropower shut voltage reference
1.225V and adjustable.
LM385
Low current voltage reference. Fixed Voltages of
1.2V and 2.5V.
Contact your National Semiconductor representative for the
latest information.
9.0 Spice Macromodel
A Spice Macromodel is available for the LMC7221 compara-
tor on the National Semiconductor Amplifier Macromodel
disk. Contact your National Semiconductor representative to
obtain the latest version.
DS012346-18
FIGURE 3.
www.national.com
8
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LMC7221AIM/NOPB | 功能描述:校驗器 IC RoHS:否 制造商:STMicroelectronics 產品: 比較器類型: 通道數量: 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 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| LMC7221AIM/NOPB | 制造商:Texas Instruments 功能描述:Voltage Comparator IC |
| LMC7221AIM5 | 功能描述:校驗器 IC RoHS:否 制造商:STMicroelectronics 產品: 比較器類型: 通道數量: 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 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| LMC7221AIM5 | 制造商:Texas Instruments 功能描述:COMPARATOR RAIL/RAIL IP SMD 7221 |
| LMC7221AIM5/NOPB | 功能描述:校驗器 IC Comp W/Open Drain RoHS:否 制造商:STMicroelectronics 產品: 比較器類型: 通道數量: 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 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
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