Analog Devices Creates Class-D Audio Amplifiers for Portable Electronics
Analog Devices, a global leader in high performance semiconductors for signal-processing applications and the market leader in amplifiers, introduced two Class-D audio amplifiers designed to meet the low-power, small size, and growing sound quality requirements of portable electronics. A leader in delivering innovative sound processing solutions for home and professional applications, ADI is applying its expertise to Class-D amplifiers that address the space constraints and battery-consumption requirements of cellular handsets, handheld game machines, MP3 players, laptop computers, and handheld media devices.
ADI’s SSM2301 and SSM2304 Class D amplifiers are designed to efficiently drive speakers in handheld and portable consumer applications by consuming minimal power, employing sigma-delta modulation to reduce electromagnetic interference (EMI) emissions, and integrating a filterless topology that eliminates external components.
Combining the power-saving and space-saving benefits of Class-D audio technology with ADI’s linear IC expertise has enabled a portfolio of audio amplifiers that deliver exceptional sound for a range of applications—from portable devices such as cellular handsets and MP3 players, to thin flat panel advanced televisions and multi-channel surround-sound car stereos. While most Class-D amplifiers use some variation of pulse-width modulation (PWM), ADI’s Class-D amplifiers use a sigma-delta pulse density modulation (PDM) to reduce the amplitude of spectral components at high-frequencies, thus significantly minimizing EMI emissions.
Source: Analog Devices
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