SSM4321ACBZ-RL

Overview

The SSM4321ACBZ-RL is a mono Class-D audio amplifier from Analog Devices. It delivers up to 2.9 W output power and operates on a PVDD supply range of 2.5 V to 5.5 V with an IOVDD range of 1.42 V to 3.6 V. The device utilizes filterless spread-spectrum Σ-Δ modulation for ultralow EMI emissions. It features integrated digital sensing of output current, output voltage, and the PVDD supply via ADCs, providing data through TDM, I2S, or PDM interfaces. Gain is adjustable from 0 dB to 12 dB in 3 dB steps with a fixed input impedance of 80 kΩ.

Feature Summary

• Filterless Class-D architecture using spread-spectrum Σ-Δ modulation to minimize radiated EMI emissions.
• Integrated digitized sensing of output current, output voltage, and PVDD supply voltage available via serial ports.
• Flexible gain adjustment pin allowing settings from 0 dB to 12 dB in 3 dB increments with fixed input impedance.
• Pop-and-click suppression circuitry minimizes audible transients during power-up and shutdown sequences.

Applications

• Portable multimedia devices requiring low electromagnetic interference
• Automotive infotainment systems with strict emission standards
• Smart home audio speakers and voice assistants
• Industrial control panels with integrated audio feedback

Procurement Notes

Verify the specific ordering suffix matches the required reel packaging configuration. Confirm that the component revision aligns with the latest datasheet specifications before integration. Ensure the design supports the necessary sense resistor values for accurate current monitoring as defined in the application guidelines.

Selection Notes

Select this component when ultralow EMI performance is critical for RF-sensitive environments. It is suitable for designs requiring real-time monitoring of load conditions and supply voltage without external microcontrollers. Verify that the system can accommodate the required digital clock inputs for TDM or I2S operation.

Part Context

This part belongs to the SSM4321 family of mono Class-D amplifiers. It is designed for applications where board space is limited due to its filterless nature and compact WLCSP package. The device integrates protection features including thermal shutdown and output short-circuit protection.

Replacement Considerations

No public confirmed substitute part numbers are documented.