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LM49250 Datasheet Enhanced Emissions Suppression Stereo Class D Audio Sub-System

Manufacturer: National Semiconductor (now Texas Instruments)

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General Description

The LM49250 is a fully integrated audio subsystem designed for stereo cell phone applications.

The LM49250 combines a 2.4W/Ch stereo class D speaker amplifiers with a 45mW/Ch stereo ground referenced headphone amplifier, a class AB earpiece amplifier, National 3D enhancement, volume control, and an input mixer into a single device.

The filterless class D amplifiers deliver 1.2W/Ch into an 8Ω load with <1% THD +N from a 5V supply.

Overview

LM49250 Enhanced Emissions Suppression Stereo Class D Audio Sub-System with Ground Referenced Headphone Amplifier and Mono Earpiece www.DataSheet4U.

Key Features

  • a new circuit technology that utilizes a charge pump to generate a negative supply voltage. This allows the headphone outputs to be biased about ground, thereby eliminating the output-coupling capacitors. For improved noise immunity, the LM49250 features fully differential left, right and mono inputs. The three inputs can be mixed/multiplexed to any output combination of the loudspeaker, headphone or earpiece amplifiers. The left and right differential inputs can be used as separate single-ended.

More Datasheets from National Semiconductor (now Texas Instruments)

Part Number Description
LM4925 2 Cell/ Single Ended Output 40mW Stereo Headphone Audio Amplifier
LM4920 Stereo Headphone Amplifier
LM4921 Low Voltage I2S 16-Bit Stereo DAC
LM4922 80mW Stereo Headphone Amplifier
LM4923 1.1 Watt Fully Differential Audio Power Amplifier
LM4924 Stereo Headphone Audio Amplifier
LM4926 Ground-Referenced and Ultra Low Noise - Fixed Gain - 80mW Stereo Headphone Amplifier
LM4927 2.5 Watt Fully Differential Audio Power Amplifier
LM49270 Filterless 2.2W Stereo Class D Audio Subsystem
LM4928 1.2 Watt Stereo Fully Differential Audio Amplifier