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SSM2306:  2 W, Filterless, Class-D Stereo Audio Amplifier

Product Details

The SSM2306 is a fully integrated, high efficiency, Class-D stereo audio amplifier designed to maximize performance for portable applications. The application circuit requires minimum external components and operates from a single 2.5 V to 5.0 V supply. It is capable of delivering 2 W of continuous output power with less than 10% THD + N driving a 4 Ω load from a 5.0 V supply.

The SSM2306 features ultralow idle current, high efficiency, and a low noise modulation scheme. It operates with >87% efficiency at 1.4 W into 8 Ω from a 5.0 V supply and has a signal-to-noise ratio (SNR) that is better than 96 dB. PDM modulation offers lower EMI radiated emissions compared to other Class-D architectures.

The SSM2306 has a micropower shutdown mode with a typical shutdown current of 20 nA. Shutdown is enabled by applying a logic low to the SD pin.

The architecture of the device allows it to achieve a very low level of pop and click to minimize voltage glitches at the output during turn-on and turn-off, thereby reducing audible noise on activation and deactivation. The fully differential input of the SSM2306 provides excellent rejection of common-mode noise on the input. Input coupling capacitors can be omitted if the dc input common-mode voltage is approximately VDD/2.

The SSM2306 also has excellent rejection of power supply noise, including noise caused by GSM transmission bursts and RF rectification.

The SSM2306 has a preset gain of 18 dB that can be reduced by using external resistors.

The SSM2306 is specified over the commercial temperature range (−40°C to +85°C). It has built-in thermal shutdown and output short-circuit protection. It is available in a 16-lead, 3 mm × 3 mm lead frame chip scale package (LFCSP).

  • Mobile phones
  • MP3 players
  • Portable gaming
  • Portable electronics
  • Educational toys
  • Notebook computers


  • Filterless Class-D amplifier with built-in output stage
  • 2 W into 4 Ω and 1.4 W into 8 Ω at 5.0 V supply
  • Ultralow idle current with load resistance
  • >87% efficiency at 5.0 V, 1.4 W into 8 Ω speaker
  • Better than 96 dB SNR (signal-to-noise ratio)
  • Available in 16-lead, 3 mm × 3 mm LFCSP
  • Single-supply operation from 2.5 V to 5.0 V
  • 20 nA ultralow shutdown current
  • Short-circuit and thermal protection
  • Pop-and-click suppression
  • Built-in resistors reduce board component count
  • Default fixed 18 dB gain and user-adjustable

Functional Block Diagram for SSM2306

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

SSM2306 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
SSM2306-EVALZ Status: Contact ADI Evaluation Board $50.50 Yes -
SSM2306-MINI-EVALZ Status: Last Time Buy Evaluation Board - Yes - Contact ADI

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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