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SSM2304:  2 W Filterless Class-D Stereo Audio Amplifier

The SSM2304 is a fully integrated, high efficiency, Class-D stereo audio amplifier. It is designed to maximize performance for portable applications. The application circuit requires a mini-mum of 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. ...More

SSM2304:  2 W Filterless Class-D Stereo Audio Amplifier

Product Description

The SSM2304 is a fully integrated, high efficiency, Class-D stereo audio amplifier. It is designed to maximize performance for portable applications. The application circuit requires a mini-mum of 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 SSM2304 features a high efficiency, low noise modulation scheme. It operates with 85% 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 98 dB. PDM modulation is used to provide lower EMI-radiated emissions compared with other Class-D architectures.

The SSM2304 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. 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 SSM2304 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 SSM2304 also has excellent rejection of power supply noise, including noise caused by GSM transmission bursts and RF rectification.

The SSM2304 has a preset gain of 18 dB, which can be reduced by using external resistors.

The SSM2304 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).

Applications

  • Notebooks and PCs
  • Mobile phones
  • MP3 players
  • Portable gaming
  • Portable electronics
  • Educational toys

    • Data Sheet, Rev. 0, 1/07

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    • 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 with <10% THD
    • 85% efficiency at 5.0 V, 1.4 W into 8 Ω speaker
    • Better than 98 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
    • Supply Current : 7mA
    • Output Power (W): 2W

    Functional Block Diagram for SSM2304

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    * The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
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    • Commercial: 0 to +70 degrees Celsius
    • Military : -55 to +125 degrees Celsius
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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.
    **Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.