LME49720NA/NOPB

LME49720NA/NOPB Application Field and Working Principle

The LME49720NA/NOPB is a dual high-performance audio operational amplifier from Texas Instruments. It is categorized as one of the Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps. This amplifier has been specifically designed for increasing the performance and sound quality of low-noise audio applications. It is widely used in applications such as microphones and headset amplifiers, high-fidelity audio amplifiers, and 4-to-20 mA current loop isolation measurement amplifiers. The device can provide high power efficiency, low power consumption, low total harmonic distortion, and wide dynamic range.

Features and Benefits

• Low noise: -117 dBV at 1 kHz
• Low distortion: 0.000099%
• Wide bandwidth: ±2.2 MHz
• Low power consumption
• High slew rate: 13 V/µs
• Low input voltage noise: 9 nV/√Hz @ 500 MHz

Applications

• Microphone and headset amplifiers
• High-fidelity audio amplifiers
• 4-to-20 mA current loop isolation measurement amplifiers
• DC-coupled application designs
• Equipment monitoring systems
• Pre-amplifiers

Working Principle

The LME49720NA/NOPB is a dual high-performance audio operational amplifier that uses a three-stage amplified feedback circuit to achieve low noise and low distortion. Its low noise and low distortion performance is attributed to its low input currents, small input capacitance, and very small input offset voltage. The device produces high power efficiency, low power consumption, low total harmonic distortion, and wide dynamic range.

The LME49720NA/NOPB consists of two single power amplifiers, each with a separate power supply and common ground pin. The power supply of each amplifier can be provided independently, either with a single power supply or dual power supplies. The two amplifiers are connected in series, with the outputs being connected to the same node. The amplifiers provide a very high common-mode rejection ratio (CMRR) over a wide range of temperatures and frequencies.

The LME49720NA/NOPB also features high input impedance, high output current capability, high voltage gain, and low current consumption. It includes a number of protection features such as short-circuit protection and an output shield. The device is also capable of powering down during low-power operation, allowing increased battery life.

Conclusion

The LME49720NA/NOPB is a dual high-performance audio operational amplifier from Texas Instruments. This amplifier has been specifically designed for increasing the performance and sound quality of low-noise audio applications. It provides high power efficiency, low power consumption, low total harmonic distortion, and wide dynamic range. The amplifier includes a three-stage amplified feedback circuit, high input impedance, high output current capability, high voltage gain, and low current consumption, making it ideal for a wide range of applications.