LMP7731 Datasheet, PDF (1/20 Pages) National Semiconductor (TI) – 2.9 nV/sqrt(Hz) Low Noise, Precision, RRIO, Operational Amplifier

July 2007
LMP7731
2.9 nV/sqrt(Hz) Low Noise, Precision, RRIO, Operational
Amplifier in SOT23-5
General Description
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.
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.
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.
The LMP7731 is offered in a 5-pin SOT23 package.
Features
(Typical values, T_A = 25°C, V_S = 5V)
■ ^{Input voltage noise}
— f = 3 Hz
— f = 1 kHz
■ ^{Offset voltage (max)}
■ ^{Offset voltage drift (max)}
■ ^CMRR
■ ^{Open loop gain}
■ ^GBW
■ ^{Slew rate}
■ ^{THD @ f = 10 kHz, A}_V ^{= +1, R}_L ^{= 2 kΩ}
■ ^{Supply current per channel}
■ ^{Supply voltage range}
■ ^{Operating temperature range}
■ ^{Input bias current}
■ ^RRIO
■ ^{5-Pin SOT23 package}
3.3 nV/√Hz
2.9 nV/√Hz
±40 µV
±1.0 µV/°C
130 dB
130 dB
22 MHz
2.4 V/µs
0.001%
2.2 mA
1.8V to 5.5V
−40°C to 125°C
±1.5 nA
Applications
■ ^{Thermopile amplifier}
■ ^{Gas analysis instruments}
■ ^{Photometric instrumentation}
■ ^{Medical instrumentation}
Typical Application
Thermopile Signal Amplifier
LMP^® is a registered trademark of National Semiconductor Corporation.
© 2007 National Semiconductor Corporation 201752
20175201
www.national.com