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參數(shù)資料
| 型號(hào)： | LMP8277MAX/NOPB |
| 廠商： | National Semiconductor |
| 文件頁(yè)數(shù)： | 12/13頁(yè) |
| 文件大小： | 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(lèi)型： | 差分 |
| 電路數(shù)： | 1 |
| 輸出類(lèi)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(lèi)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： | LMP8277MAX |
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= VOS (LMP8277)
7 (X)
(7VOS1).(X) + (VOS2)
= VOS (LMP8277)
7
(7VOS1) + (VOS2)
VS = 4.75V to 5.5V
OUT
LMP8277
+
-
A1
GND
+IN
-IN
A2
GAIN = 2
A1
A2
100 k:
GAIN = 7
PROPRIETARY
LEVEL-SHIFT
CIRCUITRY
OBSOLETE
SNOSAK3G – DECEMBER 2004 – REVISED MARCH 2007
APPLICATION NOTE
LMP8277
The LMP8277 is a single supply amplifier with a fixed gain of 14 and a common mode voltage range of
2V to
16V. The fixed gain is achieved in two separate stages, a preamplifier with gain of +7 and a second stage
amplifier with gain of +2. A block diagram of the LMP8277 is shown in Figure 20.
Figure 20. LMP8277
The overall offset of the LMP8277 is minimized by trimming amplifier A1. This is done so that the output referred
offset of A1 cancels the input referred offset of A2 or 7VOS1 = 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. Care must be given when pin 3 and 4, A1 and A2, are
connected to each other. If the signal going from A1 to A2 is amplified or attenuated (by use of amplifiers and
resistors), the overall LMP8277 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 LMP8277.
Referencing the input referred offset voltages of each 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)
POWER SUPPLY DECOUPLING
In order to decouple the LMP8277 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 almost greatly reduce the noise introduced by the power supply.
SECOND ORDER LOW PASS FILTER
The LMP8277 can be effectively used to build a second order Sallen-Key low pass filter. The general filter is
shown in Figure 21:
8
Copyright 2004–2007, Texas Instruments Incorporated
Product Folder Links: LMP8277
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| LMP8278MMEVAL/NOPB | 制造商:Texas Instruments 功能描述:HIGH COMMON MODE, 14 X GAIN, PRECISION C - Boxed Product (Development Kits) 制造商:Texas Instruments 功能描述:BOARD EVAL FOR LMP8278 制造商:Texas Instruments 功能描述:High Common Mode, 14 x Gain, Precision C |
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| LMP8278QMM/NOPB | 功能描述:電流靈敏放大器 Hi Common Md Prec Current Sensing Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 共模抑制比（最小值）:110 dB 輸入補(bǔ)償電壓:80 uV 電源電壓-最大:5.5 V 電源電壓-最小:2.7 V 電源電流:350 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel |
| LMP8278QMME/NOPB | 功能描述:電流靈敏放大器 Hi Common Md Prec Current Sensing Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 共模抑制比（最小值）:110 dB 輸入補(bǔ)償電壓:80 uV 電源電壓-最大:5.5 V 電源電壓-最小:2.7 V 電源電流:350 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel |
| LMP8278QMMX/NOPB | 功能描述:電流靈敏放大器 Hi Common Md Prec Current Sensing Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 共模抑制比（最小值）:110 dB 輸入補(bǔ)償電壓:80 uV 電源電壓-最大:5.5 V 電源電壓-最小:2.7 V 電源電流:350 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel |
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