INA137PA

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The INA137PA is a high-speed, precision, low-power, single-ended, 5 MHz, rail-to-rail input and output current feedback amplifier. It belongs to linear amplifiers, and more specifically, audio devices. As such, its primary application fields are audio frequency range and power amplifications, as well as control and signal conditioning.

The INA137PA features an excellent slew rate and is designed for high-speed applications. It provides a gain bandwidth product of 5MHz, with a low total harmonic distortion of 0.01%. It offers a low supply current of only 9.8 mA, enabling efficient operation in many battery-powered audio applications.

The INA137PA utilizes a single-ended topology, with a wide dynamic range. This prevents distortion from clipping, even when amplifying loud signals. Additionally, it achieves input-to-output crossover at 3.2 mV, allowing it to deliver significant precision even with low input signals.

The INA137PA provides good data communication through its low offsets, noise and low bias current. This makes it suitable for use in applications such as speaker and headphone amplifiers, multi-channel audio systems and sound playback and recording.

The working principle of the INA137PA is necessary to understand in order to effectively use it. The amplifier has a basic output stage of a current-feedback topology, comprising an input buffer and a high-speed amplifier stage. Output current is accurately measured by a resistor, and input voltage is reduced to a small differential to ensure adequate gain stability.

The low supply current of the INA137PA is enabled by the powered-down mode, which reduces supply current to only 2 µA. This helps conserve battery power when operating in current sources. Furthermore, the amplifier is capable of high-impedance connections, being able to sustain up to 10 kΩ source impedances.

All of these features show that the INA137PA is a highly useful amplifier for audio applications. It is a powerful, low-cost, low-power amplifier solution, allowing industry professionals and hobbyists to access crystal clear audio signals, free from distortion. With its good dynamic range, low THD, low supply current and high-speed operation, the INA137PA is an excellent choice for anyone looking for precision, quality and reliable audio performance.

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