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SSM2315:  FILTERLESS, HIGH EFFICIENCY, MONO 3 W CLASS-D AUDIO AMPLIFIER

The SSM2315 features a high efficiency, low noise modulation scheme that requires no 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 >103 dB. Spread-spectrum pulse density modulation is used to provide lower ...More

SSM2315:  FILTERLESS, HIGH EFFICIENCY, MONO 3 W CLASS-D AUDIO AMPLIFIER

Product Description

The SSM2315 features a high efficiency, low noise modulation scheme that requires no 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 >103 dB. Spread-spectrum pulse density modulation is used to provide lower EMI-radiated emissions compared with other Class-D architectures.

The SSM2315 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 suppression circuitry minimizes voltage glitches at the output during turn-on and turn-off, reducing audible noise on activation and deactivation.

The fully differential input of the SSM2315 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 the SSM2315 is 6 dB, but users can reduce the gain by using a pair of external resistors (see the Gain section).

The SSM2315 is specified over the industrial 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, 9/08

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EVALUATION BOARDS & DEVELOPMENT KITS

  • Filterless Class-D amplifier with Σ-Δ modulation
  • No sync necessary when using multiple Class-D amplifiers from Analog Devices, Inc.
  • 3 W into 3 µ load and 1.4 W into 8 µ load at 5.0 V supply with <1% total harmonic distortion (THD + N)
  • 93% efficiency at 5.0 V, 1.4 W into 8 µ speaker
  • >103 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
  • Supply Current : 3.3mA
  • Speaker Driver: Mono
  • Output Power (W): 3W

Functional Block Diagram for SSM2315

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  • Military : -55 to +125 degrees Celsius
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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.