Contained within the LM4930 Boomer audio subsystem IC are a stereo I2C digital-to-analog converter, voiceband codec, stereo headphone amp, mono speaker amp, microphone preamp, and sidetone generator, all with I2C control. The 36-bump microSMD device offers three digital interfaces: pulse-code modulation for digital voice data, I2S for digital stereo audio from sources such as MP3, and an I2C interface. The latter sets the mode of operation, volume levels, and other functions. Pricing is $3.95 each in quantities of 1000.
National Semiconductor Corp.