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參數(shù)資料
| 型號(hào)： | LMP8270MAX/NOPB |
| 廠商： | National Semiconductor |
| 文件頁數(shù)： | 16/17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 |
= VOS (LMP8270)
10 (X)
(10VOS1) x (X) + (VOS2)
= VOS (LMP8270)
10
(10VOS1) + (VOS2)
VS = 4.75V to 5.5V
OUT
LMP8270
+
-
A1
GND
+IN
-IN
A2
GAIN = 2
A1
A2
100 k:
GAIN = 10
PROPRIETARY
LEVEL - SHIFT
CIRCUITRY
OBSOLETE
SNOSAK1K – DECEMBER 2004 – REVISED APRIL 2013
APPLICATION NOTE
LMP8270
The LMP8270 is a single supply amplifier with a fixed gain of 20 and a common mode voltage range of
2V to
16V. The fixed gain is achieved in two separate stages, a preamplifier with gain of +10 and a second stage
amplifier with gain of +2. A block diagram of the LMP8270 is shown in Figure 21.
Figure 21. LMP8270
The overall offset of the LMP8270 is minimized by trimming amplifier A1. This is done in such a way that the
output referred offset of A1 cancels the input referred offset of A2 or 10VOS1 = VOS2.
Because of this offset voltage relationship, the offset of each individual amplifier stage may be more than the limit
specified for the overall system in the datasheet tables. If the signal going from A1 to A2 is amplified or
attenuated (by use of amplifiers and resistors), the overall LMP8270 offset will be affected as a result. Filtering
the signal between A1 and A2 or simply connecting the two pins will not change the offset of the LMP8270.
Referencing the input referred offset voltages of each input stage, the following relationship holds:
(1)
If the signal on pin 3 is scaled, attenuated or amplified, by a factor X, then the offset of the overall system will
become:
(2)
LIFETIME DRIFT
Input Offset Voltage is an electrical parameter which may drift over time. This drift, known as lifetime drift, is very
common in operational amplifiers; however, its effect is more evident in precision amplifiers. This is due to the
very low Input Offset Voltage specifications in these amplifiers.
Numerous reliability tests have been performed to characterize this drift for the LMP8270. Prior to each long term
reliability test the Input Offset Voltage of the LMP8270 was measured at room temperature. The LMP8270 was
then subjected to a preconditioning sequence consisting of a 16 hour bake at 125°C; an unbiased 168 hour
Temperature Humidity Storage Test, THST, at 85°C and 85% humidity; four passes of infra-red reflow with a
maximum temperature of 260°C; and finally one hundred 30 min Temperature Cycles, TMCL, between
65°C
and 150°C (15 min at each temperature).
The long term reliability tests include Operating Life Time, OPL, performed at 150
C for an extended period of
time; Temperature Humidity Bias Testing, THBT, at 85°C and 85% humidity for an extended period of time and
repeated cycles of TMCL.
8
Copyright 2004–2013, Texas Instruments Incorporated
Product Folder Links: LMP8270
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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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