LMP7731_09 Datasheet, PDF (1/18 Pages) National Semiconductor (TI) – 2.9 nV/sqrt(Hz) Low Noise, Precision, RRIO Amplifier

LMP7731
May 20, 2009
2.9 nV/sqrt(Hz) Low Noise, Precision, RRIO Amplifier
General Description
The LMP7731 is a single, low noise, rail-to-rail input and out-
put, low voltage 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/
√Hz with a 1/f corner of only 3 Hz. 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 level 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 the space saving 5-Pin SOT-23
and 8-Pin SOIC packages.
Features
(Typical values, T_A = 25°C, V_S = 5V)
■ ^{Input voltage noise}
— f = 3 Hz
— f = 1 kHz
■ ^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
3.3 nV/√Hz
2.9 nV/√Hz
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
■ ^{Gas analysis instruments}
■ ^{Photometric instrumentation}
■ ^{Medical instrumentation}
Typical Performance Characteristics
Input Voltage Noise vs. Frequency
Input Current Noise vs. Frequency
20175261
LMP^® is a registered trademark of National Semiconductor Corporation.
© 2009 National Semiconductor Corporation 201752
20175262
www.national.com