With the MAX98357 and MAX98358 digital-input Class D audio power amplifiers by Maxim Integrated Products, designers can achieve high efficiency in a compact, cost-efficient solution. Despite their ultra-small form factors, these amplifiers deliver 3,2 W of Class AB audio performance for enhanced audio quality and are ideal for a wide variety of applications.
Traditionally, electronics designers use analog amplifiers requiring a digital-to-analog converter (DAC) and line driver amplifier on the application processor. This adds overall die cost to the speaker output and affects the form factor of the overall solution size.
The MAX98357 pulse-code modulation (PCM) and MAX98358 pulse-density modulation (PDM) speaker amplifiers reduce overall solution size by taking advantage of Maxim’s clever pin-out and by significantly reducing the number of required components compared to typical analog amplifier designs.
Since most customers control their volume digitally upstream, these features enable customers to take advantage of wafer-level packaging without the need for expensive vertical interconnect access (VIAs). The ICs feature a digital input for noise immunity, along with high jitter tolerance and excellent electromagnetic interference (EMI) performance allowing the use of longer traces to the speakers without added external filtering.
To simplify design, the chips only require users to connect a single power supply and feed the bit clock (BCLK) and left-right clock (LRCLK), without needing a master clock (MCLK). These amplifiers further simplify designs by auto-configuring for up to 35 different clocking configurations and 128 different digital audio formats. This automatic configuration eliminates complicated I²C programming as there is no need to rewrite base code to configure a design just to add audio functionality.
As more applications (such as smart speakers) start requiring multi-directional/channel audio, the need for amplifiers like the MAX98357 and MAX98358 that can be easily daisy-chained to support speaker arrays (up to 8 channels supported by time division multiplex) will continue to grow.
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