0.1

1

10

1k

10k

FREQUENCY (Hz)

1

10

100

100

0.1

1

10

1k

10k

FREQUENCY (Hz)

1

10

100

100

LMP7731

www.ti.com

SNOSAT6E – JULY 2007 – REVISED MARCH 2013

2.9 nV/sqrt(Hz) Low Noise, Precision, RRIO Amplifier

Check for Samples: LMP7731

1

FEATURES

DESCRIPTION

The LMP7731 is a single, low noise, rail-to-rail input

23

and output, low voltage amplifier. The LMP7731 is

•

Input Voltage Noise

part of the LMP™ precision amplifier family and is

–

f = 3 Hz 3.3 nV/

√Hz

ideal for precision and low noise applications with low

voltage requirements.

–

f = 1 kHz 2.9 nV/

√Hz

•

CMRR 130 dB

This operational amplifier offers low voltage noise of

2.9 nV/

√Hz with a 1/f corner of only 3 Hz. The

•

Open Loop Gain 130 dB

LMP7731 has bipolar input stages with a bias current

•

GBW 22 MHz

of

only

1.5

nA.

This

low

input

bias

current,

•

Slew Rate 2.4 V/µs

complemented by the very low level of voltage noise,

makes

the

LMP7731

an

excellent

choice

for

•

photometry applications.

•

Supply Current per Channel 2.2 mA

The LMP7731 provides a wide GBW of 22 MHz while

•

Supply Voltage Range 1.8V to 5.5V

consuming only 2 mA of current. This high gain

•

Operating Temperature Range

−40°C to 125°C

bandwidth along with the high open loop gain of 130

•

Input Bias Current ±1.5 nA

dB

enables

accurate

signal

conditioning

in

applications with high closed loop gain requirements.

•

RRIO

The LMP7731 has a supply voltage range of 1.8V to

APPLICATIONS

5.5V, making it an ideal choice for battery operated

portable applications.

•

Gas Analysis Instruments

The LMP7731 is offered in the space saving 5-Pin

•

Photometric Instrumentation

SOT-23 and 8-Pin SOIC packages.

•

Medical Instrumentation

Typical Performance Characteristics

Input Voltage Noise

Input Current Noise

vs.

vs.

Frequency

Frequency

Figure 1.

Figure 2.

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

LMP is a trademark of Texas Instruments.

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2007–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.