Digital Input, Mono 2 W,
Class-D Audio Power Amplifier
SSM2529
This unique architecture enables extremely low real-world power
consumption from digital audio sources with excellent audio
performance. The SSM2529 is ideal for power sensitive applications,
such as mobile phones and portable media players, where system
noise can the corrupt small analog signals that are sent to an
analog input audio amplifier.
Data Sheet
FEATURES
Filterless mono, digital input Class-D amplifier
I2C control interface
Serial digital audio interface supports common formats
(I2S, PCM, LJ, RJ, TDM1-16, PDM)
Supports wide range of sample rates: 8.0 kHz to 96.0 kHz
MCLK and BCLK can be provided by built-in phase-locked
loop (PLL)
Supports single power supply mode; DVDD can be provided
by built-in low dropout (LDO) regulator
2.5 V to 5.5 V SPKVDD operating supply voltage
1.08 V to 1.98 V DVDD operating supply voltage
Support off-chip volume control without I2C
2.4 W into 4 Ω and 1.4 W into 8 Ω at 5 V supply with <1% THD + N
Available in a 16-ball, 1.92 mm × 1.94 mm, 0.4 mm pitchWLCSP
Efficiency 95% at full scale into 8 Ω
Using the SSM2529, audio data can be transmitted to the amplifier
over a standard digital audio serial interface, thereby significantly
reducing the effect of noise sources such as GSM interference or
other digital signals on the transmitted audio. The closed-loop
digital input design retains the benefits of an all-digital amplifier, yet
enables very good PSRR and audio performance. The three-level,
Σ-Δ Class-D modulator is designed to provide the least amount of
EMI, the lowest quiescent power dissipation, and the highest
audio efficiency without sacrificing audio quality.
The audio input is provided via a serial audio interface that can be
programmed to accept all common audio formats, including I2S,
TDM, and PDM. Control of the IC is provided via an I2C control
interface. An alternative to I2C control is standalone operation
mode, which allows several settings that are adjusted by off-chip
external resistors. The SSM2529 can accept a variety of input MCLK
frequencies and can use BCLK as the clock source in some
configurations. An integrated PLL can also provide the device
master clock.
Signal-to-noise ratio (SNR): 103 dB, A-weighted
Power supply rejection ratio (PSRR): >80 dB at 217 Hz
Digital volume control: −70 dB to +24 dB in 0.375 dB steps
Ultralow idle current
Autosample rate detection
Pop-and-click suppression
Short-circuit and thermal protection with programmable
autorecovery
Supports smart power-down when no input signal is detected
Power-on reset and UVLO voltage monitoring
Selectable ultralow EMI emission mode
Supports SPKVDD voltage monitor
The integrated DSP includes soft digital volume control circuits; a
de-emphasis, high-pass filter; a seven-band programmable equalizer;
and a programmable digital dynamic range compressor. In addition,
the part includes a feedforward speaker temperature prediction
module to protect the loudspeaker.
Digital audio processing
7-band programmable equalizer
Programmable dynamic range compression (DRC) with
noise gate, expander, compressor, and limiter
The SSM2529 supports single-supply mode, where DVDD is
provided by the on-chip LDO regulator, eliminating the need for an
external digital core supply.
APPLICATIONS
The digital interface is very flexible and convenient. It can offer a
better system solution for other products whose sole audio source
is digital, such as wireless speakers, laptop PCs, portable digital
televisions, and navigation systems.
Mobile phones
Portable media players
Laptop PCs
Wireless speakers
Portable gaming
Navigation systems
The SSM2529 is specified over the industrial temperature range of
−40°C to +85°C. It has built-in thermal shutdown and output short-
circuit protection. It is available in a 16-ball, 1.92 mm × 1.94 mm
wafer level chip scale package (WLCSP).
GENERAL DESCRIPTION
The SSM2529 is a digital input, Class-D power amplifier that combines
a digital-to-analog converter (DAC), a low power audio specific
digital signal processor, and a sigma-delta (Σ-Δ) Class-D modulator.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rightsof third parties that may result fromits use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks andregisteredtrademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2012 Analog Devices, Inc. All rights reserved.
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