SSM2311CBZ-REEL

Overview

The SSM2311CBZ-REEL is a mono Class-D audio amplifier from Analog Devices, utilizing filterless Σ-Δ modulation to eliminate external LC output filters. It delivers up to 3 W into a 3 Ω load and 1.4 W into an 8 Ω load at a 5.0 V supply with less than 1% THD. The device operates on a single supply ranging from 2.5 V to 5.5 V, achieving 90% efficiency at 1.4 W into an 8 Ω speaker. It features a signal-to-noise ratio exceeding 98 dB, 20 nA shutdown current, and pop-and-click suppression. The component is housed in a 9-ball, 1.5 mm × 1.5 mm WLCSP package.

Feature Summary

• Filterless design using spread-spectrum Σ-Δ modulation reduces EMI emissions and eliminates the need for external output filters.
• Integrated pop-and-click suppression minimizes audible transients during power-up and shutdown sequences.
• Micropower shutdown mode provides ultralow standby current consumption of 20 nA.
• Built-in thermal shutdown and short-circuit protection ensure operational reliability.

Applications

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

Procurement Notes

Verify the specific reel quantity suffix (e.g., REEL vs. REEL7) against the manufacturer's ordering guide to ensure correct packaging configuration. Confirm RoHS compliance status as indicated by the Z suffix in the part number. Cross-reference the revision history to ensure the datasheet matches the production batch specifications.

Selection Notes

Select this component for designs requiring high efficiency and minimal board space due to the absence of output filtering components. Ensure the input signal bias falls within the recommended common-mode voltage range to potentially omit input coupling capacitors. Verify that the load impedance and supply voltage align with the specified power output capabilities.

Part Context

This component belongs to the SSM2311 series of fully integrated, high-efficiency Class-D audio amplifiers designed for mobile applications. It utilizes a differential input architecture to reject common-mode noise. The device is specified over the industrial temperature range of −40°C to +85°C and includes user-adjustable gain settings via external resistors.

Replacement Considerations

SSM2311CBZ-R21

FAQ

Is external input coupling required?

Input coupling capacitors are optional if the DC input common-mode voltage is approximately VDD/2. They are required if the signal is not biased within the 1.0 V to VDD − 1.0 V range or for single-ended inputs.

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 = 300kΩ / (37.5kΩ + Rext).