Data Sheet
SSM3582
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.
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.
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.
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 ꢀA.
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 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 SSM3582 is specified over the commercial temperature range
of −40C to +85C. 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.
Rev. 0| Page 3 of 59
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