SSM2305CPZ-R2

Overview

The SSM2305CPZ-R2 is a mono, filterless Class-D audio amplifier manufactured by Analog Devices Inc. It operates on a single supply voltage ranging from 2.5 V to 5.5 V and delivers up to 2.8 W into a 4 Ω load or 1.6 W into an 8 Ω load at 5.0 V with less than 1% THD+N. The device utilizes Sigma-Delta modulation for high efficiency (up to 98% SNR) without requiring external LC output filters. It features ultralow shutdown current of 20 nA, pop-and-click suppression, and built-in thermal and short-circuit protection. The component is housed in an 8-lead, 3 mm × 3 mm LFCSP package.

Feature Summary

• Filterless design utilizing 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 cycles.
• Micropower shutdown mode reduces system power consumption with a maximum shutdown current of 30 nA.
• Built-in resistors allow for fixed or user-adjustable gain configurations while reducing board component count.

Applications

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

Procurement Notes

Verify the specific ordering suffix R2 against the manufacturer's official Ordering Guide to confirm the reel quantity and packaging format. Ensure the LFCSP-8 footprint matches the CP-8-13 outline dimensions provided in the datasheet. Confirm RoHS compliance status as indicated by the Z suffix in the part number. Cross-reference the temperature range specifications with your system requirements.

Selection Notes

Select this component for applications requiring high efficiency and minimal external components in space-constrained designs. The default 18 dB gain can be adjusted using external resistors if lower gain is required. Consider the thermal resistance characteristics of the LFCSP package when designing the PCB layout to ensure adequate heat dissipation under maximum load conditions.

Part Context

This component belongs to the SSM2305 series of high-efficiency Class-D audio amplifiers. It is designed specifically for mobile phone applications where maximizing battery life and minimizing board space are critical. The series includes variants in both LFCSP and MSOP packages, offering flexibility for different manufacturing and assembly requirements.

Replacement Considerations

SSM2305CPZ-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 speaker to recover the audio signal.

How is the gain of the SSM2305 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).