LMP7731_15 Datasheet, PDF (1/26 Pages) Texas Instruments – 2.9 nV/sqrt(Hz) Low Noise, Precision, RRIO Amplifier

LMP7731
www.ti.com
SNOSAT6E – JULY 2007 – REVISED MARCH 2013
2.9 nV/sqrt(Hz) Low Noise, Precision, RRIO Amplifier
Check for Samples: LMP7731
FEATURES
1
23(Typical Values, T_A = 25°C, V_S = 5V)
• Input Voltage Noise
– f = 3 Hz 3.3 nV/√Hz
– f = 1 kHz 2.9 nV/√Hz
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.
• CMRR 130 dB
• Open Loop Gain 130 dB
• GBW 22 MHz
• Slew Rate 2.4 V/µs
• THD @ f = 10 kHz, A_V = +1, R_L = 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
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.
APPLICATIONS
• Gas Analysis Instruments
The LMP7731 has a supply voltage range of 1.8V to
5.5V, making it an ideal choice for battery operated
portable applications.
• Photometric Instrumentation
The LMP7731 is offered in the space saving 5-Pin
• Medical Instrumentation
SOT-23 and 8-Pin SOIC packages.
Typical Performance Characteristics
Input Voltage Noise
vs.
Frequency
100
V_S = 2.5V, 3.3V, 5V
Input Current Noise
vs.
Frequency
100
V_S = 2.5V, 3.3V, 5V
10
V_CM = 0.5V
V_CM = 2.5V
1
0.1
1
10 100 1k 10k
FREQUENCY (Hz)
Figure 1.
V_CM = 0.5V
10
V_CM = 2.5V
1
0.1
1
10 100 1k 10k
FREQUENCY (Hz)
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.
LMP is a trademark of Texas Instruments.
2
All other trademarks are the property of their respective owners.
3
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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