SSM2518CPZ

Overview

The SSM2518CPZ is a digital input, stereo Class-D audio power amplifier manufactured by Analog Devices Inc. It integrates a digital-to-analog converter and a sigma-delta modulator to process digital audio signals 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 features a 97 dB signal-to-noise ratio, 91% efficiency, and supports I2C control or standalone operation. The CPZ suffix indicates the 20-lead, 4.0 mm × 4.0 mm LFCSP package.

Feature Summary

• Filterless digital input architecture combining DAC and sigma-delta modulation for low noise and high efficiency
• Supports multiple serial audio formats including I2S, left/right justified, TDM, and PCM
• Includes programmable digital volume control, dynamic range compression, and pop-and-click suppression
• Features smart power-down modes and automatic sample rate detection for optimized power management

Applications

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

Procurement Notes

Verify that the ordering suffix matches the required package type, as the SSM2518 is available in both WLCSP and LFCSP configurations. Confirm the specific temperature grade (e.g., Industrial) if operating outside standard ranges. Ensure the source documentation explicitly lists the CPZ variant to avoid confusion with other package options.

Selection Notes

Select this component when a fully digital audio interface is required to minimize system noise from GSM interference or digital switching. It is suitable for applications where board space is limited due to its compact LFCSP footprint. Consider the ultralow EMI mode if electromagnetic compatibility is a critical design constraint.

Part Context

The SSM2518 belongs to a family of digital input Class-D amplifiers designed for portable electronics. It offers an alternative to traditional analog input amplifiers by eliminating external DACs. The device provides high audio performance while maintaining low power consumption through advanced modulation techniques and intelligent power management features.

Replacement Considerations

Direct replacements include other SSM2518 variants with different package suffixes such as the WLCSP version. Verify pinout compatibility and thermal characteristics when substituting between package types.

FAQ

How does the SSM2518 handle digital audio interfaces?

It accepts common digital audio formats via a serial interface, including I2S, left justified, right justified, TDM, and PCM.

What protection features are included?

The device includes short-circuit protection, thermal protection with programmable autorecovery, and pop-and-click suppression.