Class-D Audio Amplifiers incorporate I²C interface.

Press Release Summary:

Low-power SSM2380 features I²C interface that allows gain stages to be set from 1-24 dB (plus mute) in 47 distinct steps with no external components required. It achieves 100 dB SNR and 93% power efficiency at 5 V while running at 1.4 W into 8 W speaker. Operating from single 2.5-5 V supply, fully-integrated SSM2375 offers single-pin 5-level gain setting in 3 dB stages from 0-12 dB, eliminating need for input resistors. SSM2375 offers greater than 98 dB SNR, and 80 dB PSRR at 215 Hz.

Original Press Release:

Analog Devices' Class-D Audio Amplifiers Reduce Design Complexity and Enhance Sound Quality in Portable Electronics

o SSM2375 Class-D amp offers a variety of gain-stage settings while achieving exceptional SNR and PSRR performance.

o SSM2380 stereo Class-D amp offers flexible ALC functions and easy programming.

NORWOOD, Mass. - Analog Devices, Inc. (ADI), a global leader in high-performance semiconductors for signal-processing applications, today 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.

The SSM2375 is a high-performance, fully-integrated Class-D amplifier with single-pin 5-level gain setting in 3-dB stages from 0 dB to 12 dB. The single-pin gain setting eliminates input resistors and ensures a better input match that reduces noise and improves audio quality. Operating from a single 2.5-V to 5-V supply, the amplifier delivers 3 W of continuous output power with less than 1 percent THD (total harmonic distortion) when driving a 3-ohm load from a 5-V supply.

The SSM2375 offers greater than 98-dB SNR performance and at 215 Hz achieves an 80-dB PSRR (power-supply rejection ratio) that is 10 dB higher than the closest competing Class-D amplifier. The amplifier's low noise and EMI allow engineers more flexibility to place the speaker on the board in end product designs.

Availability, Pricing and Complementary Products

Product Samples Availability Temperature Range Price Each Per 1,000 Packaging

SSM2375 March May -40°C to +85°C $0.57 9-Lead WLCSP

SSM2380 March April -40°C to +85°C $0.75 16-Lead WLCSP

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About Analog Devices

Innovation, performance, and excellence are the cultural pillars on which Analog Devices has built one of the longest standing, highest growth companies within the technology sector. Acknowledged throughout the industry as the world leader in data conversion and signal conditioning technology, Analog Devices serves over 60,000 customers, representing virtually all types of electronic equipment. Celebrating over 40 years as a leading global manufacturer of high-performance integrated circuits used in analog and digital signal processing applications, Analog Devices is headquartered in Norwood, Massachusetts, with design and manufacturing facilities throughout the world. Analog Devices' common stock is listed on the New York Stock Exchange under the ticker "ADI" and is included in the S&P 500 Index.

Source: Analog Devices, Inc

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