SSM2304CPZ-REEL7

Overview

The SSM2304CPZ-REEL7 is a fully integrated, high-efficiency Class-D stereo audio amplifier manufactured by Analog Devices Inc. It operates from a single supply voltage ranging from 2.5 V to 5.0 V and delivers up to 2 W of continuous output power into a 4 Ω load with less than 10% THD+N at 5.0 V. The device utilizes a filterless Σ-Δ modulation scheme to minimize electromagnetic interference (EMI) emissions while maintaining an efficiency of 85% at 1.4 W into an 8 Ω speaker. Key electrical specifications include a signal-to-noise ratio exceeding 98 dB, a typical shutdown current of 20 nA, and a default closed-loop gain of 18 dB. It features built-in thermal shutdown and short-circuit protection.

Feature Summary

• Filterless Class-D architecture utilizing Sigma-Delta modulation for reduced EMI emissions and minimized external component count.
• Integrated pop-and-click suppression circuitry to eliminate audible transients during power-up and shutdown sequences.
• Micropower shutdown mode enabling ultralow standby current consumption for extended battery life in portable devices.
• Built-in differential input stage providing excellent rejection of common-mode noise and power supply ripple.

Applications

• Notebooks and personal computers
• Mobile phones and handheld communication devices
• MP3 players and portable media devices
• Portable gaming consoles
• Educational toys

Procurement Notes

Verify the obsolete status of this component prior to procurement, as indicated in the datasheet revision history. Confirm that the LFCSP-16 package dimensions align with your PCB footprint requirements. Ensure that the supply voltage range of 2.5 V to 5.0 V matches your system's power rail capabilities. Check for availability of alternative sources or evaluation boards if production support is required.

Selection Notes

Select this amplifier for applications requiring high efficiency and low noise in a compact form factor. The 18 dB fixed gain is suitable for direct drive from standard audio sources; use external resistors if lower gain is necessary. Consider the thermal resistance characteristics when designing for high-power outputs into low impedance loads. Verify that the input common-mode voltage range accommodates your signal source biasing requirements.

Part Context

This component belongs to the SSM2304 series of stereo audio amplifiers. It is designed specifically for portable electronics where board space and power efficiency are critical constraints. The device integrates the output stage, modulator, and protection circuits into a single 16-lead LFCSP package, simplifying the design process compared to discrete solutions.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

FAQ

Does the SSM2304 require an output filter?

No, the SSM2304 uses a filterless modulation scheme that relies on the inherent inductance of the speaker coil and the natural filtering of the speaker to recover the audio signal.

How is the gain of the amplifier adjusted?

The SSM2304 has a default fixed gain of 18 dB set by internal resistors. The gain can be reduced by connecting external resistors to the input pins.

What is the purpose of the SD pin?

The SD pin is the Shutdown Input. Applying a logic low to this pin activates the micropower shutdown mode, reducing the supply current to approximately 20 nA.