Datasheet > LMP8276

LMP8276

更新时间： 2024-11-22 22:31:11

品牌	Logo	应用领域
美国国家半导体 - NSC		放大器
页数	文件大小	规格书
5页	468K
描述
High Common Mode, Gain of 20, Bidirectional Precision Voltage Difference Amplifiers

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LMP8276 数据手册

PRELIMINARY

January 2005

LMP8271, LMP8276

High Common Mode, Gain of 20, Bidirectional Precision

Voltage Difference Amplifiers

General Description

Features

n Bidirectional Current Sense Capability

n Typical Values, TA = 25˚C

n Input Offset Voltage

n TCVos (LMP8271)

n TCVos (LMP8276)

n CMRR

™

The LMP 8271, LMP8276 are fixed gain differential ampli-

fiers with a -2V to 27V input common mode voltage range

and a supply voltage range of 4.5V to 5.5V. The LMP8271,

LMP8276 are precision amplifiers which will detect, amplify

and filter small differential signals in the presence of high

common mode voltages. The gain is fixed at 20 and is

adequate to drive an ADC to full scale in most cases. This

fixed gain is achieved in two separate stages, a pre-amplifier

with gain of +10 and a second stage amplifier with a gain of

+2. The internal signal path is brought out on two pins that

provide a connection for a filter network.

1mV max

15µV/˚C max

30µV/˚C max

80dB Min

-5V to 36V

Rail to Rail

80KHz

n Extended CMVR

n Output Voltage Swing

n Bandwidth

n Operating Temperature Range (Ambient) -40˚C to 125˚C

n Operating Temperature Range (bare die) -40˚C to 150˚C

n Supply Voltage

n Supply Current

The LMP8271, LMP8276 will function with reduced specifi-

cations over the extended common mode input voltage

range of -5 to 36 Volts. This feature makes the device

suitable for applications with load dump in automotive sys-

tems.

4.5V to 5.5V

1mA

Applications

The midrail offset adjustment pin enables the user to utilize

this device for bidirectional current sensing. This is achieved

by adjusting an externally set voltage reference. Accurate

bidirectional load current measurements are achieved when

monitoring the output with respect to this reference voltage

n Fuel Injection Control

n Low Side Driver Configuration Current Sensing

n Power Management Systems

Typical Application

Typical Application: Low side Current Sensing

20130801

™

LMP is a trademark of National Semiconductor Corporation.

DS201308

www.national.com

12 3 4 5

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