SSM2311CBZ-REEL7

Overview

The SSM2311CBZ-REEL7 is a fully integrated, high-efficiency mono Class-D audio amplifier from Analog Devices. It utilizes a filterless Σ-Δ modulation scheme, eliminating the need for external LC output filters. The device operates on a single supply voltage ranging from 2.5 V to 5.5 V and delivers up to 3 W of continuous output power into a 3 Ω load at 5.0 V with less than 1% THD+N. Key electrical specifications include an efficiency of 90% at 1.4 W into an 8 Ω speaker, a signal-to-noise ratio exceeding 98 dB, and a typical shutdown current of 20 nA. It features built-in thermal and short-circuit protection.

Feature Summary

• Filterless design using Sigma-Delta modulation to reduce electromagnetic interference and component count
• Micropower shutdown mode with ultralow standby current consumption
• Integrated pop-and-click suppression circuitry to minimize audible transients during power cycles
• Built-in resistors and default fixed gain settings to simplify board layout

Applications

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

Procurement Notes

Verify the specific ordering suffix (REEL7) against the manufacturer's official documentation to confirm tape and reel packaging quantities. Ensure compatibility with the required industrial temperature range (-40°C to +85°C). Confirm RoHS compliance status as indicated in the ordering guide. Cross-reference the pinout configuration for the 9-ball WLCSP package during PCB design validation.

Selection Notes

Select this component for applications requiring high efficiency without external output filtering. The differential input architecture provides excellent common-mode noise rejection. Consider the user-adjustable gain feature if system requirements differ from the default 18 dB setting. Ensure the power supply decoupling meets the low ESL and ESR requirements specified in the datasheet to maintain performance.

Part Context

This part belongs to the SSM2311 series of mono Class-D audio amplifiers designed for mobile phone applications. It is manufactured by Analog Devices Inc. and is available in a 9-ball, 1.5 mm × 1.5 mm wafer level chip scale package (WLCSP). The REEL7 suffix indicates the specific tape and reel packaging format used for automated assembly processes.

Replacement Considerations

SSM2311CBZ-R2

FAQ

Does the SSM2311 require external output filters?

No, the SSM2311 uses a filterless Sigma-Delta modulation scheme that relies on the inherent inductance of the speaker coil and natural filtering to recover the audio signal.

How is the gain of the amplifier 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 = 300kΩ / (37.5kΩ + Rext).