NS Boomer3D Stereo Audio Subsystem

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National Semiconductor Corporation announces the introduction of the new Boomer® LM4844 audio subsystem, which has the advantage of streamlining the design of portable audio systems, enabling engineers to easily design excellence for mobile phones and other battery-powered portable electronic products. Full-bandwidth stereo and 3D sound system for sound effects. Boomer audio power amplifiers deliver exceptional output power with minimal external component support.

The LM4844 chip not only has a built-in 1.2W stereo speaker amplifier and headphone driver, volume control, mixing, power management, but also uses National's 3D sound enhancement technology and presets ten different output modes. The system is available in a small SMD package that is only 2.5mm x 3mm in size and is easy to use.

Because the LM4844 chip uses a layout with no output capacitor headphones, the headphone output eliminates the need for external capacitors, saving more space on the board. The layout of the headphone with no output capacitors improves the low frequency response of the audio output and helps reduce the switching/switching noise of the headphone amplifier. In addition, the subsystem also features National's switching noise suppression circuit, which can further reduce the switching/switching noise of the headphones and speaker output.

National's LM4844 high-integration stereo speaker driver can deliver up to 495mW per channel for 8W loads with a 3.3V supply, while stereo headphone drivers deliver up to 33mW for 32W loads. Because the subsystem's functionality can be controlled through an I2C-compatible interface, designers can add left, right, and mono independent volume controls to the system.

The 3D sound enhancement technology of the LM4844 chip improves the problem of too close stereo left and right channel speakers, allowing compact electronic products or other devices with other constraints to enhance stereo sound. In addition, the LM4844 supports flexible input signal mixing and output path switching with 10 different output modes to choose from. Design engineers have the flexibility to mix and match different input audio signals to any stereo or stereo headset. In addition, the chip's shutdown current is as low as 0.1μA (typ).

The LM4844 is available in a 30-bump micro SMD package measuring only 2.5mm x 3mm and is priced at $2 each in 1,000-unit quantities.

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