1FEATURES
23(Typical Values, TA = 25°C, VS = 5V)
• Input Voltage Noise
– f = 3 Hz 3.3 nV/√Hz
– f = 1 kHz 2.9 nV/√Hz
• CMRR 130 dB
• Open Loop Gain 130 dB
• GBW 22 MHz
• Slew Rate 2.4 V/μs
• THD @ f = 10 kHz, AV = +1, RL = 2 kΩ 0.001%
• Supply Current per Channel 2.2 mA
• Supply Voltage Range 1.8V to 5.5V
• Operating Temperature Range −40°C to 125°C
• Input Bias Current ±1.5 nA
• RRIO

APPLICATIONS
• Gas Analysis Instruments
• Photometric Instrumentation
• Medical Instrumentation

DESCRIPTION
The LMP7731 is a single, low noise, rail-to-rail input
and output, 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
photometry applications.
The LMP7731 provides a wide GBW of 22 MHz while
consuming only 2 mA of current. This high gain
bandwidth along with the high open loop gain of 130
dB enables accurate signal 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 applications.
The LMP7731 is offered in the space saving 5-Pin
SOT-23 and 8-Pin SOIC packages.