LMP7312

更新时间： 2024-11-23 05:42:27

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
22页	1014K
描述
Precision SPI-Programmable AFE with Differential/Single-Ended Input/Output

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LMP7312 数据手册

June 18, 2010

LMP7312

Precision SPI-Programmable AFE with Differential/Single-

Ended Input/Output

General Description

Features

The LMP7312 is a digitally programmable variable gain am-

plifier/attenuator. Its wide input voltage range and superior

precision make it a prime choice for applications requiring

high accuracy such as data acquisition systems for IO mod-

ules in programmable logic control (PLC). The LMP7312

provides a differential output to maximize dynamic range and

signal to noise ratio, thereby reducing the overall system er-

ror. It can also be configured to handle single ended input data

converters by means of the V_OCMpin (see application section

for details). The inputs of LMP7312 can be configured in at-

tenuation mode to handle large input signals of up to +/- 15V,

as well as in amplification mode to handle current loops of

0-20mA and 4-20mA.The LMP7312 is equipped with a null

switch to evaluate the offset of the internal amplifier. A guar-

anteed 0.035% maximum gain error (for all gains) and a

maximum gain drift of 5ppm over the extended industrial tem-

perature range (-40° to 125°C) make the LMP7312 very

attractive for high precision systems even under harsh con-

ditions. A low input offset voltage of 100µV and low voltage

noise of 3µVpp give the LMP7312 a superior performance.

The LMP7312 is fully specified from -40° to 125°C and is

available in SOIC-14 package.

Typical Values, T_A= 25°C, V⁺=5V, V^-=0V.

Gain bandwidth

Input voltage range (G= 0.096 V/V)

Core op-amp input offset voltage

Supply current

1 MHz

-15V to +15V

100 µV (max)

2 mA (max)

■

Gain (Attenuation Mode)

0.096 V/V, 0.192 V/V

■

0.384 V/V, 0.768 V/V

1 V/V, 2 V/V

0.035% (max)

90 dB (min)

Gain (AmplificationMode)

Gain Error

Core op-amp PSRR

CMRR

Adjustable output common mode

Temperature range

Package

■

80 dB (min)

1V to 4V

−40 to 125°C

14-Pin SOIC

Applications

Signal conditioning AFE

■

±10V; ±5V; 0-5V; 0-10V; 0-20mA; 4-20mA

Data Acquisition systems

Motor control

■

Instrument and process control

Remote sensing

Programmable automation control

Typical Application

30075513

LMP™ is a trademark of National Semiconductor Corporation.

300755

www.national.com

12 3 4 5 6 7...22

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与LMP7312相关器件

型号	品牌	获取价格	描述	数据表
LMP7312MA	NSC	获取价格	Precision SPI-Programmable AFE with Differential/Single-Ended Input/Output
LMP7312MA/NOPB	TI	获取价格	单路、5.5V、1MHz 运算放大器 \| D \| 14 \| -40 to 125
LMP7312MAX	NSC	获取价格	Precision SPI-Programmable AFE with Differential/Single-Ended Input/Output
LMP7312MAX/NOPB	TI	获取价格	Single, 5.5-V, 1-MHz operational amplifier \| D \| 14 \| -40 to 125
LMP7701	NSC	获取价格	Precision, CMOS Input, RRIO, Wide Supply Range Amplifier
LMP7701	TI	获取价格	LMP7701/LMP7702/LMP7704 Precision, CMOS Input, RRIO, Wide Supply Range Amplifiers
LMP7701_06	NSC	获取价格	Precision, CMOS Input, RRIO, Wide Supply Range Amplifiers
LMP7701MA	TI	获取价格	LMP7701/LMP7702/LMP7704 Precision, CMOS Input, RRIO, Wide Supply Range Amplifiers
LMP7701MA/NOPB	TI	获取价格	精密 CMOS 输入 RRIO 宽电源电压范围单通道放大器 \| D \| 8
LMP7701MAX	TI	获取价格	LMP7701/LMP7702/LMP7704 Precision, CMOS Input, RRIO, Wide Supply Range Amplifiers

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