SSM2305CPZ-REEL

Overview

The SSM2305CPZ-REEL is a mono Class-D audio amplifier from Analog Devices, utilizing filterless Σ-Δ modulation. It delivers 2.8 W into a 4 Ω load and 1.6 W into an 8 Ω load at a 5.0 V supply with less than 1% THD+N. Operating on a single supply from 2.5 V to 5.5 V, it achieves up to 98 dB SNR and features ultralow shutdown current of 20 nA. The device includes built-in thermal and short-circuit protection, pop-and-click suppression, and user-adjustable gain configurations.

Feature Summary

• Filterless design using Sigma-Delta modulation eliminates the need for external LC output filters.
• Integrated pop-and-click suppression minimizes audible transients during power-up and power-down.
• Micropower shutdown mode reduces system standby consumption significantly.
• Built-in resistors allow for fixed or user-adjustable gain settings to reduce board component count.

Applications

• Mobile phones
• MP3 players
• Portable gaming devices
• Educational toys

Procurement Notes

Verify the specific package option (LFCSP) against the ordering guide to ensure compatibility with the REEL suffix. Confirm that the RoHS compliant marking matches the required environmental standards for the target assembly process. Cross-reference the temperature range specifications with the operational environment requirements.

Selection Notes

Select this component when minimizing external passive components is critical for board space reduction. The filterless architecture suits applications where speaker inductance provides sufficient filtering. Ensure the input signal bias falls within the recommended common-mode voltage range to potentially omit input coupling capacitors.

Part Context

This part belongs to the SSM2305 series of high-efficiency Class-D amplifiers designed for mobile phone applications. It shares architectural similarities with other filterless models but is distinct in its specific power delivery capabilities and packaging options. The CPZ suffix indicates the Lead Frame Chip Scale Package variant.

Replacement Considerations

SSM2305CBZ-REEL

FAQ

Does the SSM2305 require external output filters?

No, the SSM2305 uses a filterless Sigma-Delta modulation scheme that relies on the inherent inductance of the speaker coil and natural filtering of the human ear.

How is the gain configured?

The default closed-loop gain is 18 dB. Users can reduce the gain by adding a pair of external resistors calculated using the formula: External Gain Settings = 296 kΩ/(37 kΩ + REXT).