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Data Sheet

SSM3582

Rev. 0| Page 3 of 59

GENERAL DESCRIPTION

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-of-

the-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 +85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.

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