2x, 31.76 W, Digital Input, Filterless Stereo Class-D Audio Amplifier
The SSM3582 is a fully integrated, high efficiency, digital input stereo Class-D audio amplifier. It can operate from a single supply, and requires only a few external components, significantly reducing the circuit bill of materials.
A proprietary, spread spectrum Σ-Δ modulation scheme enables direct connection to the speaker, and ensures state-ofthe-art analog performance while lowering radiated emissions compared to other Class-D architectures. An optional ultralow electromagnetic interference (EMI) mode significantly reduces radiated emissions above 100 MHz, enabling longer speaker cable lengths. Audio is transmitted digitally to the amplifier, minimizing the possibility of signal corruption in digital environments. The amplifier provides outstanding analog performance, with an over 106 dB signal-to-noise ratio and a vanishingly low 0.004% THD + N.
The SSM3582 operates from a single 4.5 V to 16 V supply, and is capable of delivering 2 × 15 W rms continuously into 8 Ω and 4 Ω loads at <1% total harmonic distortion (THD). The efficient modulation scheme maintains excellent power efficiency over a wide range of impedances: 93% into an 8 Ω load and 90% into a 4 Ω load. Optimization of the output pulse maintains performance at impedances as low as 3 Ω/5 μH, enabling its use with extended bandwidth tweeters.
The pulse code modulation (PCM) audio serial port supports most common protocols, such as I2S, left justified, and time division multiplexing (TDM), and can address up to 16 devices on a single interface, for up to 32 audio playback channels.
IC operation is controlled through a dedicated I2C interface. The two ADDRx pins (2×, 5-level) define up to 16 individual addresses in I2C and standalone modes, and automatically set the default TDM slots attribution.
A micropower shutdown mode is triggered by removing the digital audio interface clock, with a typical current of <1 μA. A software power-down mode is also available.
An automatic power-down feature shuts down the amplifier and the digital-to-analog converter (DAC) when no signal is present at the input, minimizing power consumption during digital silence. The device restarts when nonzero data is present at the input. Mute and unmute transitions are pop/click free.
The SSM3582 is specified over the commercial temperature range of −40°C to +85deg;C. The device has built-in thermal shutdown and output short-circuit protection, as well as an early thermal warning with programmable gain limiting to maintain operation.
The SSM3582 is available in a 40-lead, 6 mm × 6 mm lead frame chip scale package (LFCSP), with a thermal pad to improve heat dissipation.
- Mobile computing
- All in one computers
- Portable electronics
- Wireless speakers
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
The EVAL-SSM3582Z is the evaluation board for the SSM3582, an integrated stereo, 31.76 W, high efficiency, Class-D, audio amplifier with digital input. The application circuit requires few external components and can operate from a single 4.5 V to 16 V supply. The EVAL-SSM3582Z is capable of delivering 14.67 W of continuous output power to a 4 Ω load from a 12 V power supply, with <1% THD + N, or 31.76 W into a 4 Ω load from 16 V, 10% THD + N.
The SSM3582 features a high efficiency, low noise modulation scheme that requires no external reconstruction filter (LC) output filters. This scheme provides high efficiency, even at low output power.
The EVAL-SSM3582Z and the SSM3582 operate with 93.8% efficiency at 10 W into an 8 Ω load or 90.6% efficiency at 18 W into 4 Ω load from a 12 V supply. The EVAL-SSM3582Z and the SSM3582 have a typical noise floor of 38.5 μV rms A weighted.
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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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.