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SSM3302:  2 ×10 W Filterless Class-D Stereo Audio Amplifier

Product Details

Product Status:Recommended for New Designs

The SSM3302 is a fully integrated, high efficiency, stereo Class-D audio amplifier. The application circuit requires minimal external components and operates from a single 7 V to 18 V supply. The device is capable of delivering 2 × 10 W of continuous output power into a 4 Ω load (or 2 × 8 W into 8 Ω) with <1% THD + N from a 12 V supply. In addition, while mono mode is activated, the user can drive a load as small as 2 Ω up to 20 W continuous output power by stacking the stereo output terminals.

The SSM3302 features a high efficiency, low noise modulation scheme that requires no external LC output filters. This scheme continues to provide high efficiency even at low output power. The SSM3302 operates with 90% efficiency at 7 W into an 8 Ω load or with 82% efficiency at 10 W into 4 Ω from a 12 V supply, and it has an SNR of >98 dB.

Spread spectrum pulse density modulation (PDM) is used to provide lower EMI radiated emissions compared with other Class-D architectures. The SSM3302 includes an optional modulation select pin (ultralow EMI emission mode) that significantly reduces the radiated emissions at the Class-D outputs, particularly above 100 MHz. The SSM3302 can pass FCC Class-B emissions testing with an unshielded 20 inch cable using common-mode choke-based filtering.

The fully differential input of the SSM3302 provides excellent rejection of common-mode noise on the input. The device also includes a highly flexible gain select pin that only requires one series resistor to choose a gain between 9 dB and 24 dB, with no change to the input impedance. The benefit of this is to improve gain matching between multiple SSM3302 devices within a single application compared with using external resistors to set gain.

The SSM3302 includes an integrated voltage regulator that generates a 5 V rail.

The SSM3302 has a micropower shutdown mode with a typical shutdown current of 10 μA. Shutdown is enabled by applying a logic low to the SD pin. The device also includes pop-and-click suppression circuitry that minimizes voltage glitches at the output during turn on and turn off, reducing audible noise during activation and deactivation.

Other included features to simplify system level integration of the SSM3302 are input low-pass filtering to suppress out-ofband DAC noise interference to the pulse density modulator, fixed input impedance to simplify component selection across multiple platform production builds, and a thermal warning indicator pin.

The SSM3302 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 halide-free, 40-lead, 6 mm × 6 mm lead frame chip scale package (LFCSP).

APPLICATIONS

  • Mobile computing
  • Flat panel televisions
  • Media docking stations
  • Portable electronics
  • Sound bars

FEATURES and BENEFITS

  • Filterless stereo Class-D amplifier with Σ-Δ modulation
  • 2 × 10 W into 4 Ω load and 2 × 8 W into 8 Ω load at 12 V supply with <1% total harmonic distortion plus noise (THD + N)
  • 91% efficiency at 12 V, 8 W into 8 Ω speaker
  • 98 dB signal-to-noise ratio (SNR)
  • Single-supply operation from 7 V to 18 V
  • Flexible gain adjustment pin from 9 dB to 24 dB
  • Fixed input impedance of 40 kΩ
  • See data sheet for additional features

Functional Block Diagram for SSM3302

Evaluation Kits & Symbols & Footprints

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Price, packaging, availability

SSM3302 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
SSM3302ACPZ Status: Production 40 ld LFCSP (6x6mm w/4.3mm pad) 40 Ind Tray, 490 $2.70 $2.30 Y  Material Info PCN Purchase Sample
SSM3302ACPZ-R7 Status: Production 40 ld LFCSP (6x6mm w/4.3mm pad) 40 Ind Reel, 750 $2.70 $2.30 Y  Material Info PCN Purchase
SSM3302ACPZ-RL Status: Production 40 ld LFCSP (6x6mm w/4.3mm pad) 40 Ind Reel, 2500 - $2.30 Y  Material Info PCN Purchase
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.

SSM3302 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-SSM3302Z Status: Production Evaluation Board $200.00 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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