Overview
The LMP7731MFX/NOPB is a single, low noise, rail-to-rail input and output operational amplifier produced by Texas Instruments. It is part of the LMP precision amplifier family and is ideal for precision and low noise applications with low voltage requirements. This amplifier offers low voltage noise of 2.9 nV/√Hz with a 1/f corner of only 3 Hz, making it an excellent choice for applications such as photometry, gas analysis, and medical instrumentation. The LMP7731 provides a wide gain bandwidth of 22 MHz while consuming only 2 mA of current, and it operates within a supply voltage range of 1.8V to 5.5V, making it suitable for battery-operated portable applications.
Key Specifications
| Parameter | Typical Value | Units |
|---|---|---|
| Input Voltage Noise | 2.9 nV/√Hz @ 1 kHz | nV/√Hz |
| 1/f Corner Frequency | 3 Hz | Hz |
| Common Mode Rejection Ratio (CMRR) | 130 dB | dB |
| Open Loop Gain | 130 dB | dB |
| Gain Bandwidth Product (GBW) | 22 MHz | MHz |
| Slew Rate | 2.4 V/µs | V/µs |
| Total Harmonic Distortion + Noise (THD+N) | 0.001% @ f = 10 kHz, AV = +1, RL = 2 kΩ | % |
| Supply Current per Channel | 2.2 mA | mA |
| Supply Voltage Range | 1.8V to 5.5V | V |
| Operating Temperature Range | −40°C to 125°C | °C |
| Input Bias Current | ±1.5 nA | nA |
| Package | SOT-23 (DBV)-5 |
Key Features
- Low voltage noise of 2.9 nV/√Hz with a 1/f corner of only 3 Hz.
- Bipolar input stages with a low input bias current of ±1.5 nA.
- Rail-to-rail input and output capability.
- High gain bandwidth of 22 MHz.
- High open loop gain of 130 dB.
- Low total harmonic distortion + noise (THD+N) of 0.001% at f = 10 kHz.
- Supply voltage range of 1.8V to 5.5V, suitable for battery-operated applications.
- Operating temperature range of −40°C to 125°C.
- Available in space-saving 5-Pin SOT-23 and 8-Pin SOIC packages.
Applications
- Photometric instrumentation: Ideal for applications requiring low noise and high precision.
- Gas analysis instruments: Suitable for sensitive signal conditioning in gas analysis applications.
- Medical instrumentation: Used in medical devices requiring high precision and low noise amplification.
- Battery-operated portable applications: The low supply voltage range makes it suitable for portable devices.
Q & A
- What is the typical input voltage noise of the LMP7731MFX/NOPB?
The typical input voltage noise is 2.9 nV/√Hz at 1 kHz and 3.3 nV/√Hz at 3 Hz.
- What is the gain bandwidth product (GBW) of the LMP7731MFX/NOPB?
The GBW is 22 MHz.
- What is the supply voltage range of the LMP7731MFX/NOPB?
The supply voltage range is from 1.8V to 5.5V.
- What is the typical input bias current of the LMP7731MFX/NOPB?
The typical input bias current is ±1.5 nA.
- What are the common applications of the LMP7731MFX/NOPB?
Common applications include photometric instrumentation, gas analysis instruments, medical instrumentation, and battery-operated portable applications.
- What is the operating temperature range of the LMP7731MFX/NOPB?
The operating temperature range is from −40°C to 125°C.
- What is the typical slew rate of the LMP7731MFX/NOPB?
The typical slew rate is 2.4 V/µs.
- What is the total harmonic distortion + noise (THD+N) of the LMP7731MFX/NOPB?
The THD+N is 0.001% at f = 10 kHz, AV = +1, and RL = 2 kΩ.
- In what packages is the LMP7731MFX/NOPB available?
The LMP7731MFX/NOPB is available in 5-Pin SOT-23 and 8-Pin SOIC packages.
- What is the common mode rejection ratio (CMRR) of the LMP7731MFX/NOPB?
The CMRR is 130 dB.
