MAX9850ETI+ Integrated Circuits (ICs)

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MAX9850ETI+ is a family of high-efficiency, wideband linear amplifiers designed especially for multimedia audio applications. It is a versatile and configurable device, and can be easily integrated into mixed-signal applications. It is well suited for a wide range of audio applications, from portable and mobile devices to professional audio equipment.

The MAX9850ETI+ is specifically designed for amplified stereo PC/laptop loudspeaker systems. The device uses a Class G amplifier architecture to achieve a high efficiency of more than 80%, and low temperature rise at high output power levels. The amplifier is protected against short-circuits and over-temperature faults.

The MAX9850ETI+ features differential input, adjustable gain setting, click-and-pop suppression, and short-circuit protection. It has an ultra-low-noise preamplifier circuitry suitable for digital input signals. The device integrates a power management system that allows it to be operated from a single 3V supply. It can be paired with a mix of other devices to create a complete audio system.

The main components of the MAX9850ETI+ are two NPN bipolar transistors, one for each channel, used as voltage amplifiers. The transistors are connected in a differential configuration for noise cancellation. The amplifier also contains an AC-coupling capacitor, which allows a low-frequency signal to pass through the amplifier without distortion, and a voltage dividing network for adjusting the amplifier’s gain.

The differential input stage feeds a transimpedance amplifier, or diff-amp, which provides a differential signal from the single-ended input audio signal. The output of the diff-amp is fed to the Class G amplifier, which features a rail-to-rail output device and a tuning network. As a result, the amplifier can run in either Class A or Class G mode, allowing it to be optimized for specific applications.

The integrated power management module provides the power and voltage control for the entire system. It contains two main functions. The first is a boost converter, which steps up the battery voltage to the required level. The second is a current-limiting controller, which senses the output current and reduces the voltage when it reaches an undesirable level.

The integrated protection features of the MAX9850ETI+ can improve product safety, provide short-circuit protection, prevent over-temperature faults, provide thermal protection, and enable the user to select between Class A and Class G operation. In addition, it has click-and-pop suppression, which protects against audible clicks and pops when the amplifier is switched off.

The MAX9850ETI+ is an ideal device for applications such as portable audio, home and professional audio systems, automotive audio systems, and multimedia audio applications. Its high efficiency and integrated protection features offer versatile and configurable performance. The wideband, low-noise preamplifier provides a robust and reliable performance for various audio applications.

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