The LM4949 is a fully integrated audio subsystem designedfor stereo cell phone applications. The LM4949 combines a2.5W stereo Class D amplifier plus a separate 190mW stereoheadphone amplifier, volume control, and input mixer into asingle device. The filterless class D amplifiers deliver 1.19W/channel into an 8Ω load with <1% THD+N from a 5V supply.The headphone amplifier features National’s Output Capacitor-less (OCL) architecture that eliminates the output couplingcapacitors required by traditional headphone amplifiers. Additionally,the headphone amplifiers can be configured withcapacitively coupled (CC)loads, or used to drive an externalheadphone amplifier. When configured for an external amplifier,the VDD/2 output (VOC) controls the external amplifier’sshutdown input.
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