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LM4949 Datasheet Stereo Class D Audio Subsystem

Manufacturer: National Semiconductor (now Texas Instruments)

Overview: www.DataSheet4U.com LM4949 Stereo Class D Audio Subsystem with OCL Headphone Amplifier September 2006 LM4949 Stereo Class D Audio Subsystem with OCL Headphone.

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General Description

The LM4949 is a fully integrated audio subsystem designed for stereo cell phone applications.

The LM4949 combines a 2.5W stereo Class D amplifier plus a separate 190mW stereo headphone amplifier, 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.

Key Features

  • National’s Output Capacitor-less (OCL) architecture that eliminates the output coupling capacitors required by traditional headphone amplifiers. Additionally, the headphone amplifiers can be configured with capacitively coupled (CC)loads, or used to drive an external headphone amplifier. When configured for an external amplifier, the VDD/2 output (VOC) controls the external amplifier’s shutdown input. For improved noise immunity, the LM4949 features fully differential left, right and mono inputs.

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