LMP7721

更新时间： 2024-11-22 03:51:43

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
16页	598K
描述
3 Femtoampere Input Bias Current Precision Amplifier

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LMP7721 数据手册

March 14, 2008

LMP7721

3 Femtoampere Input Bias Current Precision Amplifier

General Description

Features

The LMP7721 is the industry’s lowest guaranteed input bias

current precision amplifier. The ultra low input bias current is

3 fA, with a guaranteed limit of ±20 fA at 25°C and ±900 fA at

85°C. This is achieved with the latest patent pending tech-

nology of input bias current cancellation amplifier circuitry.

This technology also maintains the ultra low input bias current

over the entire input common mode voltage range of the am-

plifier.

Unless otherwise noted, typical values at T_A= 25°C, V_S= 5V.

Input bias current (V_CM= 1V)

■

max @ 25°C

max @ 85°C

Offset voltage

±20 fA

±900 fA

±26 µV

—

■

Offset voltage drift

DC Open loop gain

DC CMRR

Input voltage noise (at f = 1 kHz)

THD

Supply current

GBW

Slew rate (falling edge)

Supply voltage

Operating temperature range

8-Pin SOIC

−1.5 μV/°C

120 dB

100 dB

6.5 nV/√Hz

0.0007%

Other outstanding features, such as low voltage noise (6.5

nV/

), low DC offset voltage (±150 µV maximum at 25°C)

and low offset voltage temperature coefficient (−1.5 µV/°C),

improve system sensitivity and accuracy in high precision ap-

plications. With a supply voltage range of 1.8V to 5.5V, the

LMP7721 is the ideal choice for battery operated portable ap-

plications. The LMP7721 is part of the LMP^®precision am-

plifier family.

As part of National’s PowerWise^®products, the LMP7721

provides the remarkably wide gain bandwidth product (GBW)

of 17 MHz while consuming only 1.3 mA of current. This wide

GBW along with the high open loop gain of 120 dB enables

accurate signal conditioning. With these specifications, the

LMP7721 has the performance to excel in a wide variety of

applications such as electrochemical cell amplifiers and sen-

sor interface circuits.

1.3 mA

17 MHz

12.76 V/μs

1.8V to 5.5V

−40°C to 125°C

Applications

Photodiode amplifier

■

High impedance sensor amplifier

Ion chamber amplifier

Electrometer amplifier

The LMP7721 is offered in an 8-pin SOIC package with a

special pinout that isolates the amplifier’s input from the pow-

er supply and output pins. With proper board layout tech-

niques, the unique pinout of the LMP7721 will prevent PCB

leakage current from reaching the input pins. Thus system

error will be further reduced.

pH electrode amplifier

Transimpedance amplifier

Block Diagram of a Typical Application

20204084

Ion Chamber: Current to Voltage Converter

LMP^®is a registered trademark of National Semiconductor Corporation.

PowerWise^®is a registered trademark of National Semiconductor.

202040

www.national.com

12 3 4 5 6 7...16

中文翻译

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与LMP7721相关器件

型号	品牌	获取价格	描述	数据表
LMP7721_15	TI	获取价格	3-Femtoampere Input Bias Current Precision Amplifier
LMP7721MA	NSC	获取价格	3 Femtoampere Input Bias Current Precision Amplifier
LMP7721MA/NOPB	TI	获取价格	3-Femtoampere Input Bias Current Precision Amplifier
LMP7721MAE	TI	获取价格	IC,OP-AMP,SINGLE,SOP,8PIN,PLASTIC
LMP7721MAX	NSC	获取价格	3 Femtoampere Input Bias Current Precision Amplifier
LMP7721MAX/NOPB	TI	获取价格	3-Femtoampere Input Bias Current Precision Amplifier
LMP7731	TI	获取价格	2.9 nV/sqrt(Hz) Low Noise, Precision, RRIO Amplifier
LMP7731	NSC	获取价格	2.9 nV/sqrt(Hz) Low Noise, Precision, RRIO, Operational Amplifier
LMP7731_08	NSC	获取价格	2.9 nV/sqrt(Hz) Low Noise, Precision, RRIO Amplifier
LMP7731_09	NSC	获取价格	2.9 nV/sqrt(Hz) Low Noise, Precision, RRIO Amplifier

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