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參數(shù)資料
| 型號： | LMP8270MAX/NOPB |
| 廠商： | National Semiconductor |
| 文件頁數(shù)： | 3/17頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP PREC VOLT DIFF 8-SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | LMP® |
| 放大器類型： | 差分 |
| 電路數(shù)： | 1 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 0.7 V/µs |
| 增益帶寬積： | 80kHz |
| 電流 - 輸入偏壓： | 20pA |
| 電壓 - 輸入偏移： | 250µV |
| 電流 - 電源： | 1mA |
| 電壓 - 電源，單路/雙路(±)： | 4.75 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | LMP8270MAX |
VDC
L
O
A
D
1
Vs = 4.75 to 5.5 V
OUT
LMP8270
+
-
A1
GND
+IN
-IN
A2
GAIN = 2
A1
A2
100 k:
GAIN = 10
C1
RS1
VDC
VDC - IRS1
I
PROPRIETARY
LEVEL-SHIFT
CIRCUITRY
VS = 4.75 to 5.5V
OUT
LMP8270
+
-
A1
GND
+IN
- IN
PROPRIETARY
LEVEL-SHIFT
CIRCUITRY
A2
GAIN = 2
A1
A2
100 k:
GAIN = 10
10:
4 mA to 20 mA
CURRENT LOOP
C1
VOUT = 0.8 TO 4.0V
OBSOLETE
SNOSAK1K – DECEMBER 2004 – REVISED APRIL 2013
POWER SUPPLY DECOUPLING
In order to decouple the LMP8270 from AC noise on the power supply, it is recommended to use a 0.1
μF on the
supply pin. It is best to use a 0.1
μF capacitor in parallel with a 10 μF capacitor. This will generate an AC path to
ground for most frequency ranges and will greatly reduce the noise introduced by the power supply.
CURRENT LOOP RECEIVER
Many types of process control instrumentation use 4 to 20 mA transmitters to transmit the sensor’s analog value
to a central control room. The LMP8270 can be used as a current loop receiver as shown in Figure 25.
Figure 25. Current Loop Receiver
HIGH SIDE CURRENT SENSING
High side current measurement requires a differential amplifier with gain. Here the DC voltage source represents
a common mode voltage with the +IN input at the supply voltage and the
IN input very close to the supply
voltage. The LMP8270 can be used with a common mode voltage, VDC in this case, of up to 16V.
The LMP8270 can be used for high side current sensing. The large common mode voltage range of this device
allows it to sense signals outside of its supply voltage range. Also, the LMP8270 has very high CMRR, which
enables it to sense very small signals in the presence of larger common mode signals. The system in Figure 26
couples these two characteristics of the LMP8270 in an automotive application. The signal through RS1 is
detected and amplified by the LMP8270 in the presence of a common mode signal of up to 16V with the highest
accuracy.
Figure 26. High Side Current Sensing
Copyright 2004–2013, Texas Instruments Incorporated
11
Product Folder Links: LMP8270
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| LMP8271 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Common Mode, Gain of 20, Bidirectional Precision Voltage Difference Amplifiers |
| LMP8271A E0A WAF | 制造商:Texas Instruments 功能描述: |
| LMP8271A E0B WAF | 制造商:Texas Instruments 功能描述: |
| LMP8271MA | 制造商:Texas Instruments 功能描述:IC AMP DIFF SMD SOIC8 8271 |
| LMP8271MA/NOPB | 功能描述:IC AMP PREC DIFF 8-SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:LMP® 標(biāo)準(zhǔn)包裝:50 系列:LinCMOS™ 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.05 V/µs 增益帶寬積:110kHz -3db帶寬:- 電流 - 輸入偏壓:0.7pA 電壓 - 輸入偏移:210µV 電流 - 電源:57µA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:管件 產(chǎn)品目錄頁面:865 (CN2011-ZH PDF) 其它名稱:296-1834296-1834-5 |
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