SSM2304CPZ-REEL

Overview

The SSM2304CPZ-REEL is a fully integrated, high-efficiency Class-D stereo audio amplifier designed for portable applications. It operates from a single 2.5 V to 5.0 V supply and delivers up to 2 W into a 4 Ω load or 1.4 W into an 8 Ω load at 5.0 V with less than 10% THD+N. The device features a filterless modulation scheme using Σ-Δ technology to minimize EMI emissions. It includes built-in resistors that reduce external component count, offering a default fixed gain of 18 dB which can be adjusted via external resistors. The amplifier provides better than 98 dB SNR, ultralow shutdown current of 20 nA, and incorporates pop-and-click suppression, thermal shutdown, and short-circuit protection.

Feature Summary

• Filterless Class-D architecture utilizing Sigma-Delta modulation to reduce electromagnetic interference without requiring output filters.
• Fully differential input configuration providing excellent rejection of common-mode noise on the input signal.
• Micropower shutdown mode with typical current consumption of 20 nA, activated by a logic low signal.
• Integrated protection mechanisms including thermal shutdown and output short-circuit protection.

Applications

• Notebooks and PCs
• Mobile phones
• MP3 players
• Portable gaming devices
• Educational toys

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm package integrity upon receipt, as the LFCSP format requires careful handling. Check datasheet revisions for any updates to electrical specifications or pin configurations before finalizing design integration.

Selection Notes

Select this component for designs requiring high efficiency in space-constrained portable electronics. Ensure the power supply voltage remains within the 2.5 V to 5.0 V range. Consider the default 18 dB gain and adjust external resistors if lower gain is required. Verify PCB layout guidelines to maintain optimal performance and minimize EMI.

Part Context

The SSM2304 is part of Analog Devices' portfolio of Class-D audio amplifiers aimed at maximizing performance for portable applications. It is available in a 16-lead, 3 mm × 3 mm lead-frame chip scale package (LFCSP). The device is specified over the commercial temperature range of −40°C to +85°C.

Replacement Considerations

The datasheet marks the SSM2304 as OBSOLETE. Designers should consult Analog Devices for current replacement recommendations or alternative products within the same family that offer updated specifications and availability.

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 and human ear to recover the audio component.

How is the gain of the SSM2304 configured?

The device has a default fixed gain of 18 dB set by internal resistors. This gain can be reduced by adding external resistors at the input.

What modulation technique does the SSM2304 use?

The SSM2304 uses Sigma-Delta (Σ-Δ) modulation to determine the switching pattern of the output devices, which helps reduce EMI emissions compared to traditional pulse-width modulation.