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SSM2311:  Filterless High Efficiency Mono 3 W Class-D Audio Amplifier

Product Details

The SSM2311 is a fully integrated, high efficiency, Class-D audio amplifier. It is designed to maximize performance for mobile phone applications. The application circuit requires a minimum of external components and operates from a single 2.5 V to 5.5 V supply. It is capable of delivering 3 W of continuous output power with less than 1% THD + N driving a 3 Ω load from a 5.0 V supply.

The SSM2311 features a high efficiency, low noise modulation scheme that does not require any external LC output filters. The modulation continues to provide high efficiency even at low output power. It operates with 90% efficiency at 1.4 W into 8 Ω or 85% efficiency at 3 W into 3 Ω from a 5.0 V supply and has an SNR that is better than 98 dB. Spread-spectrum pulse density modulation is used to provide lower EMI-radiated emissions compared with other Class-D architectures.

The SSM2311 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 device also includes pop-and-click suppression circuitry. This minimizes voltage glitches at the output during turn-on and turn-off, thus reducing audible noise on activation and deactivation.

The fully differential input of the SSM2311 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 default gain of SSM2311 is 18 dB, but users can reduce the gain by using a pair of external resistors (see the Gain section). The SSM2311 is specified over the industrial temperature range (−40°C to +85°C). It has built-in thermal shutdown and output short-circuit protection. It is available in a 9-ball, 1.5 mm × 1.5 mm wafer level chip scale package (WLCSP).


  • Mobile phones
  • MP3 players
  • Portable gaming
  • Portable electronics
  • Educational toys
  • Data Sheet, Rev. 0, 1/08


    • Filterless Class-D amplifier with Σ-Δ modulation
    • No sync necessary when using multiple Analog Devices, Inc., Class-D amplifiers
    • 3 W into 3 Ω load and 1.4 W into 8 Ω load at 5.0 V supply with less than 10% total harmonic distortion (THD)
    • 90% efficiency at 5.0 V, 1.4 W into 8 Ω speaker
    • Better than 98 dB signal-to-noise ratio (SNR)
    • Single-supply operation from 2.5 V to 5.5 V
    • 20 nA ultralow shutdown current
    • See Data Sheet for Additional Information

    Functional Block Diagram for SSM2311

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    Price, packaging, availability

    SSM2311 Model Options
    Model Package Pins Temp.
    Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    SSM2311CBZ-REEL Status: Obsolete CHIPS W/SOLDER BUMPS/WLSCP 9 Ind Reel, 10000 - - Y  Material Info PDN Contact ADI
    SSM2311CBZ-REEL7 Status: Obsolete CHIPS W/SOLDER BUMPS/WLSCP 9 Ind Reel, 3000 - - Y  Material Info PCN/PDN Contact ADI
    Price Table Help

    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.

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