SSM2518CBZ-R7

Overview

The SSM2518CBZ-R7 is a digital input, stereo Class-D audio power amplifier manufactured by Analog Devices. It integrates a DAC and sigma-delta modulator to process serial digital audio directly. The device delivers 2 W into 4 Ω and 1.4 W into 8 Ω at 5 V supply with 1% THD+N. It supports I2S, left/right justified, TDM, and PCM formats via a serial interface. Control is managed through an I2C port or standalone mode. Key specifications include 97 dB SNR, 91% efficiency, and operation across a PVDD range of 2.5 V to 5.5 V.

Feature Summary

• Filterless architecture utilizing a three-level sigma-delta Class-D modulator for high efficiency and low EMI.
• Integrated digital volume control, dynamic range compression, and pop-and-click suppression.
• Supports multiple digital audio interfaces including I2S, TDM, and PCM with automatic sample rate detection.
• Includes comprehensive protection features such as short-circuit, thermal shutdown, and smart power-down.

Applications

• Mobile phones
• Portable media players
• Laptop PCs
• Wireless speakers

Procurement Notes

Verify the specific package type matches the design requirements, as the SSM2518 family includes both WLCSP and LFCSP options. Confirm that the ordering suffix corresponds to the correct reel quantity and tape configuration. Ensure the revision level aligns with the schematic and layout guidelines provided in the latest datasheet documentation.

Selection Notes

Select this component for applications requiring direct digital audio inputs to minimize analog noise susceptibility. It is suitable for battery-powered devices due to its high efficiency and low quiescent current. Consider the available packages when evaluating board space constraints. Verify compatibility with the system's digital clocking and I2C bus speeds before integration.

Part Context

The SSM2518 belongs to Analog Devices' series of digital input Class-D amplifiers designed for portable electronics. It replaces traditional DAC plus amplifier solutions by combining these functions into a single chip. This integration reduces component count and simplifies the design process for mobile and consumer audio products requiring high performance.

Replacement Considerations

Check for pin-compatible alternatives within the same product family if different packaging is required. Verify that any substitute maintains support for the necessary digital audio formats and voltage levels. Ensure equivalent protection features and control interfaces are present to avoid redesigning the firmware or hardware logic.

FAQ

What digital audio formats does the SSM2518 support?

The SSM2518 supports I2S, left justified, right justified, TDM (up to 16 channels), and PCM audio formats via its serial digital interface.

How is the SSM2518 controlled?

The device can be controlled via an I2C interface or operated in a standalone mode where settings are configured via hardware pins.

Does the SSM2518 require external output filters?

No, the SSM2518 is a filterless amplifier that uses a sigma-delta modulation scheme to eliminate the need for external LC output filters.