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LMP7731_08

更新时间： 2024-11-22 05:42:27
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美国国家半导体 - NSC 放大器
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20页 722K
描述
2.9 nV/sqrt(Hz) Low Noise, Precision, RRIO Amplifier

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June 16, 2008  
LMP7731  
2.9 nV/sqrt(Hz) Low Noise, Precision, RRIO Amplifier  
General Description  
Features  
The LMP7731 is a single, low noise, low offset voltage, rail-  
to-rail input and output, low voltage precision amplifier. The  
LMP7731 is part of the LMP® precision amplifier family and is  
ideal for precision and low noise applications with low voltage  
requirements.  
(Typical values, TA = 25°C, VS = 5V)  
Input voltage noise  
■
f = 3 Hz  
3.3 nV/√Hz  
2.9 nV/√Hz  
±40 µV  
±1.0 µV/°C  
130 dB  
—
—
f = 1 kHz  
Offset voltage (max)  
Offset voltage drift (max)  
CMRR  
Open loop gain  
GBW  
■
■
■
■
■
■
■
■
■
■
■
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This operational amplifier offers low voltage noise of 2.9 nV/  
with a 1/f corner of only 3 Hz and low DC offset with a  
maximum value of ±40 µV, targeting high accuracy, low fre-  
quency applications. The LMP7731 has bipolar input stages  
with a bias current of only 1.5 nA. This low input bias current,  
complemented by the very low AC and DC levels of voltage  
noise, makes the LMP7731 an excellent choice for photom-  
etry applications.  
130 dB  
22 MHz  
2.4 V/µs  
0.001%  
Slew rate  
THD @ f = 10 kHz, AV = +1, RL = 2 kΩ  
Supply current per channel  
Supply voltage range  
Operating temperature range  
Input bias current  
RRIO  
2.2 mA  
1.8V to 5.5V  
−40°C to 125°C  
±1.5 nA  
The LMP7731 provides a wide GBW of 22 MHz while con-  
suming only 2 mA of current. This high gain bandwidth along  
with the high open loop gain of 130 dB enables accurate sig-  
nal conditioning in applications with high closed loop gain  
requirements.  
The LMP7731 has a supply voltage range of 1.8V to 5.5V,  
making it an ideal choice for battery operated portable appli-  
cations.  
Applications  
Thermopile amplifier  
■
■
■
Gas analysis instruments  
The LMP7731 is offered in the space saving 5-Pin SOT-23  
and 8-Pin SOIC packages.  
Photometric instrumentation  
Medical instrumentation  
■
Typical Application  
Thermopile Signal Amplifier  
20175201  
LMP® is a registered trademark of National Semiconductor Corporation.  
© 2008 National Semiconductor Corporation  
201752  
www.national.com  
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