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参数资料
| 型号： | LMP8277MAX/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 12/13页 |
| 文件大小： | 0K |
| 描述： | IC AMP PREC VOLT DIFF 8-SOIC |
| 标准包装： | 2,500 |
| 系列： | LMP® |
| 放大器类型： | 差分 |
| 电路数： | 1 |
| 输出类型： | 满摆幅 |
| 转换速率： | 0.7 V/µs |
| 增益带宽积： | 80kHz |
| 电流 - 输入偏压： | 20pA |
| 电压 - 输入偏移： | 250µV |
| 电流 - 电源： | 1mA |
| 电压 - 电源，单路/双路(±)： | 4.75 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
| 其它名称： | LMP8277MAX |
= 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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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LMP8278Q | 制造商:TI 制造商全称:Texas Instruments 功能描述:High Common Mode, 14 x Gain, Precision Current Sensing Amplifier |
| LMP8278QMM/NOPB | 功能描述:电流灵敏放大器 Hi Common Md Prec Current Sensing Amp RoHS:否 制造商:Texas Instruments 通道数量: 共模抑制比（最小值）:110 dB 输入补偿电压:80 uV 电源电压-最大:5.5 V 电源电压-最小:2.7 V 电源电流:350 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
| LMP8278QMME/NOPB | 功能描述:电流灵敏放大器 Hi Common Md Prec Current Sensing Amp RoHS:否 制造商:Texas Instruments 通道数量: 共模抑制比（最小值）:110 dB 输入补偿电压:80 uV 电源电压-最大:5.5 V 电源电压-最小:2.7 V 电源电流:350 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
| LMP8278QMMX/NOPB | 功能描述:电流灵敏放大器 Hi Common Md Prec Current Sensing Amp RoHS:否 制造商:Texas Instruments 通道数量: 共模抑制比（最小值）:110 dB 输入补偿电压:80 uV 电源电压-最大:5.5 V 电源电压-最小:2.7 V 电源电流:350 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
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