Analog Devices, Inc., has introduced a pair of Class-D audio amplifiers for smart phones, GPS units and other handheld electronics where premium sound quality offers a major competitive advantage.
The SSM2375 and SSM2380 amplifiers provide audio system designers with the option of fixed or programmable gain settings combined with low noise and superior audio performance.
The SSM2380 low-power, stereo Class-D amplifier is the first in its class to incorporate an I²C interface, which allows gain stages to be set from 1 dB to 24 dB (plus mute) in 47 distinct steps with no other external components required. The programmable interface also enables independent L/R channel shutdown, a variable low-EMI (electro-magnetic interference) emission control mode, and programmable ALC (automatic level control) functions for speaker protection. The SSM2380 achieves a 100-dB SNR (signal-to-noise ratio) and extends battery life by achieving 93 percent power efficiency at 5 V while running at 1.4 W into an 8-ohm speaker.
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