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Guide to using LM49250 evaluation board

Posted: 13 Dec 2010     Print Version  Bookmark and Share

Keywords:LM49250  audio subsystem  stereo cell phone applications 

The LM49250 is a fully integrated audio subsystem designed for stereo cell phone applications. The LM49250 combines 2.5W stereo Class D speaker drivers with stereo ground referenced headphone drivers, a class AB earpiece driver, National 3D enhancement, volume control and input mixer into a single device. The filterless class D amplifiers deliver 1.19W/channel into an 8Ω load with <1% THD+N from a 5V supply.

The LM49250 features a circuit technology that utilizes a charge pump to generate a negative supply voltage. This allows the outputs to be biased about ground, thereby eliminating output-coupling capacitors typically used with normal single-ended loads. To supply the required voltage level to the ground referenced amplifier, an LDO has been integrated.

For improved noise immunity, the LM49250 features fully differential left, right and mono inputs. The three inputs can be mixed/multiplexed to either the loudspeaker, headphone or earpiece amplifiers. The left and right differential inputs can be used as separate single-ended inputs, mixing multiple stereo audio sources. The mixer, volume control, and device mode select are controlled through an I2C compatible interface.

View the PDF document for more information.

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