LM4549BVH

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The LM4549BVH is a hi-fi audio codec IC (integrated circuit) designed by National Semiconductor. It enables designers to build high-performance, low-noise audio systems, primarily for use in consumer electronics products. The LM4549BVH is a high-performance, single-chip solution for audio transformation, providing a wide range of features and a broad range of audio functions. Its features and functions are suitable for a variety of application fields, ranging from headphones to automotive audio systems and digital audio systems, including karaoke systems.

The LM4549BVH provides an unparalleled degree of integration; the chip packages a codec, an analog-to-digital and digital-to-analog converter, a volume controller, an automatic gain control circuit and a microphone preamplifier. It also contains a digital signal processor and a digital amplifier, so it is able to offer a complete audio circuit solution.

The LM4549BVH codec has a low-noise, high-performance analog-to-digital and digital-to-analog converter. The converter is capable of sampling at up to 24-bit resolution, with a 102dB SNR (Signal to Noise Ratio) and a Sample Rate Convertor (SRC) that supports sample rates up to 24-bit/192KHz.

The LM4549BVH also contains a built-in volume controller and an automatic gain control circuit to ensure that the audio signals are precisely processed and controlled. This, combined with the preamp, offers an excellent dynamic range and clarity.

The LM4549BVH also contains a powerful, ultra-low power DSP (Digital Signal Processor) that makes it possible to mix, equalize and process audio signals in the digital domain. The DSP also enables the chip to offer additional audio functions including echo cancellation, treble adjustment and bass enhancement.

The LM4549BVH also contains a digital amplifier capable of pushing up to 1.4W per channel into a 4Ω load. It has a high power efficiency and low noise, making it suitable for headphone applications.

The LM4549BVH can be used in a variety of application fields, such as consumer electronics, automotive audio systems, karaoke systems, and digital audio systems. It offers a wide range of features, including a high-performance codec, an analog to digital converter, a digital-to-analog converter, a volume controller, an automatic gain control circuit, a microphone preamp, a digital signal processor, and a digital amplifier. This makes it a complete audio circuit solution.

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