The LM49150 is a fully integrated audio subsystem designed for portable handheld
applications such as cellular phones. Part of TI's PowerWise product family, the LM49150 consumes very low power
in the various modes of operation and still providing great audio performance. The LM49150 combines
a 1.25W mono E2S (Enhanced Emission Suppression) class D amplifier,
135mW Class AB earpiece amplifier, 42mW/channel stereo ground reference headphone amplifiers,
volume control, and mixing circuitry into a single device.
The filterless class D amplifier delivers 1.25W into an 8Ω load with <1% THD+N with a
5V supply. The E2S class D amplifier features a patented, ultra low EMI
PWM architecture that significantly reduces RF emissions while preserving audio quality. The
42mW/channel headphone drivers feature TI’s ground referenced architecture that creates a
ground-referenced output from a single supply, eliminating the need for bulky and expensive
DC-blocking capacitors, saving space and minimizing cost.
The LM49150 features a fully differential mono input, and two single-ended stereo inputs.
The three inputs can be mixed/multiplexed to either the speaker or headphone amplifiers. Each input
channel has an independent, 32-step digital volume control. The headphone output stage features an
additional, 8-step gain control, while the speaker output stage has a selectable 6dB or 12dB gain.
The mixer, volume control and device mode select are controlled through an
I2C compatible serial interface.
The LM49150’s superior click and pop suppression eliminates audible transients on
power-up/down and during shutdown. The LM49150 is available in a ultra-small 20-bump DSBGA package
(2.225mm X 2.644mm).
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