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

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.

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

Product Description

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).

Applications

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

    • Data Sheet, Rev. 0, 1/08

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    • 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
    • Output Power (W): 3W
    • Efficiency (%): 85%
    • SNR (dB): 98dB
    • THD+N (dB): -67dB
    • Pos Supply: +2.5V to +5.5V
    • Supply Current : 4.2mA

    Functional Block Diagram for SSM2311

    Similar Products

    arrow View Full Interactive Product Selection Table
    Part# Output Power (W) Efficiency (%) Dynamic Range (dB) SNR (dB) THD+N (dB) Pos Supply Supply Current Price* (1000-4999)
    AD1990 5 84 102 102 -90 +8V to +12V 30mA -
    ADAU1513 23 90 96 96 - +9V to +18V 40mA $2.15
    ADAU1590 15.5 90 101 101 - +9V to +15V 65mA $2.24
    ADAU1592 18 87 101 101 -85 +9V to +18V 44mA $2.37
    SSM2301 1.4 85 - 98 - +2.5V to +5V 4.2mA $0.45
    SSM2302 2 85 - 98 -67 +2.5V to +5V - $0.92
    SSM2304 2 85 - 102 -67 +2.5V to +5V 7mA $0.81
    SSM2305 2.8 89 - 98 +-94 +2.5V to +5.5V 3.3mA $0.60
    SSM2306 2 87 - 96 - +2.5V to +5V 6.5mA $0.99
    SSM2311 3 85 - 98 -67 +2.5V to +5.5V 4.2mA $0.73
    SSM2315 3 93 - 103 - +2.5V to +5.5V 3.3mA $0.82
    SSM2317 3 93 - 93 - +2.5V to +5.5V 4.07mA $0.91
    SSM2319 3 90 - 98 - +2.5V to +5.5V 3.7mA $0.90
    SSM2335 3 93 - 96 - +2.5V to +5.5V 3.63mA $0.63
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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.
    ** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

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    • Automotive: -40 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.