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SSM2317:  Filterless High Efficiency Mono 3 W Class-D Audio Amplifier

Product Details


The SSM2317 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 <1% THD + N driving a 3 Ω load from a 5.0 V supply.

The SSM2317 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 93% 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 of >93 dB. Spread-spectrum pulse density modulation is used to provide lower EMI radiated emissions compared with other Class-D architectures.

Automatic level control (ALC) can be activated to suppress clipping and improve dynamic range. This feature only requires one external resistor tied to GND via the VTH pin and an activation voltage on the ALC_EN pin. The SSM2317 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, reducing audible noise on activation and deactivation.

The default gain of the SSM2317 is 18 dB, but users can reduce the gain by using a pair of external resistors (see the Gain section). The SSM2317 is specified over the commercial temperature range of −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. A, 6/08

FEATURES and BENEFITS

  • Filterless Class-D amplifier with Σ-Δ modulation
  • Automatic level control (ALC) improves dynamic range and prevents clipping
  • 3 W into 3 Ω load and 1.4 W into 8 Ω load at 5.0 V supply with <10% total harmonic distortion (ALC off)
  • 700 mW into 8 Ω load at 4.2 V supply (ALC 80%)
  • 93% efficiency at 5.0 V, 1.4 W into 8 Ω speaker
  • >93 dB signal-to-noise ratio (SNR)
  • Single-supply operation from 2.5 V to 5.5 V
  • See Data Sheet for Additional Information

Functional Block Diagram for SSM2317

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Price, packaging, availability

SSM2317 Model Options
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.

SSM2317 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
SSM2317-EVALZ Status: Contact ADI Evaluation Board $50.50 Yes -

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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