The LM49101 is a fully integrated audio subsystem with a mono power amplifier capable of
delivering 540mW of continuous average power into an 8Ω BTL speaker load with 1% THD+N using a 3.3V
supply. The LM49101 includes a separate stereo headphone amplifier that can deliver 44mW per
channel into 32Ω loads using a 2.75V supply.
The LM49101 has four input channels. A pair of single-ended inputs and a fully
differential input channel with volume control and amplification stages. Additionally, a bypass
differential input is available that connects directly to the mono speaker outputs through an
analog switch without any amplification or volume control stages. The LM49101 features a 32–step
digital volume control on the input stage and an 8–step digital volume control on the headphone
The digital volume control and output modes, programmed through a two-wire
I2C compatible interface, allows flexibility in routing and mixing audio
The LM49101 is designed for cellular phones, PDAs, and other portable handheld
applications. The high level of integration minimizes external components. The True Ground
headphone amplifier eliminates the physically large DC blocking output capacitors reducing required
board space and reducing cost.
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