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LM49352 LM49151 audio subsystem circuit project

2014-12-08 16:11  
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The LM49352 mixed-signal audio subsystem circuit and LM49151 analog subsystem are targeted at smart phones, full-featured phones, portable gaming devices and portable GPS devices.
The LM49352 is a mixed-signal audio subsystem circuit that integrates audio codec functionality with ground-referenced headphone amplifiers, earpiece driver, Class D loudspeaker and audio digital signal processor (DSP) in one miniature 3.3 mm by 3.3 mm package. The loudspeaker delivers ultra-high efficiency (93 percent at 970 mW from a 4.2V supply), while the headphone amplifier offers low-power (18 mW) MP3 playback to extend battery life.

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The LM49151 analog subsystem integrates an earpiece driver, Class D loudspeaker, ground-referenced headphone amplifiers and automatic level control (ALC) in an ultra-small 2.2 mm by 2.6 mm package. The LM49151 offers the lowest power in its class, consuming 7.3 mA of quiescent current at 3.3V for the loudspeaker and headphone. The subsystem’s ALC feature provides handset manufacturers with a variety of options to control audio distortion levels and prevent speaker damage.

LM49352 mixed-signal audio subsystem and LM49151 analog subsystem circuit