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Data Sheet

SSM3582A

Rev. A | Page 3 of 58

GENERAL DESCRIPTION

The SSM3582A is a fully integrated, high efficiency, digital

input stereo Class-D audio amplifier. The device 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 a

106 dB signal-to-noise ratio and a low 0.004% total harmonic

distortion + noise (THD + N).

The SSM3582A operates from a single 4.5 V to 16.5 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: 93.8% into an 8 Ω load and 90.6%

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×, five-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 and click free.

The SSM3582A 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 SSM3582A 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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