The LM4921 combines a 16-bit resolution stereo I2S input
digital-to-analog converter (DAC) with a stereo headphone audio power amplifier. It is primarily
designed for demanding applications in mobile phones and other portable communication device
applications. The LM4921 features an I2S serial interface for the
digital audio information and a 16-bit SPI serial interface for internal register control and
communication. With AVDD and DVDD =
3.0VDC and driving a 32Ω single-ended load to a
26mWRMS output level the distortion (THD+N) of the LM4921 will be less than
0.5%. The LM4921 also features a programmable 32-step digital volume control accessed through an
Boomer audio power amplifiers were designed specifically to provide high quality output
power with a minimal amount of external components. It is, therefore, ideally suited for mobile
phone and other low voltage applications where minimal power consumption is a primary requirement.
The LM4921 features a low-power consumption shutdown mode, and also has an internal
thermal shutdown protection mechanism.
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