Digital Input 2 W Class-D
Audio Power Amplifier
SSM2519
Data Sheet
FEATURES
APPLICATIONS
Filterless digital input Class-D amplifier
Standalone operation or I2C control
Serial digital audio interface supports common formats: I2S,
left justified, right justified, TDM1-16, and PCM
2.31 W into 4 Ω and 1.35 W into 8 Ω at 5 V supply with
1% THD + N
Mobile phones
Portable media players
Laptop PCs
Wireless speakers
Portable gaming
Navigation systems
Available in 12-ball 1.4 mm × 1.7 mm × 0.4 mm pitch WLCSP
Efficiency 90% at full scale into 8 Ω
FUNCTIONAL BLOCK DIAGRAM
9 mW loaded idle power at 1.8 V/3.6 V
SNR = 98 dB, A-weighted
VDD
GND
PVDD
PSRR = 80 dB at 217 Hz, dither input
Supports wide range of sample rates: 8.0 kHz to 48.0 kHz
Autosample rate and MCLK rate detection
No BCLK required for operation
2.5 V to 5.5 V PVDD speaker operating supply voltage
1.5 V to 3.6 V VDD operating voltage
POWER-ON
RESET
LRCLK
BCLK
OUT+
OUT–
2
I S
DAC
Pop and click suppression
SDATA
Short-circuit and thermal protection with autorecovery
Smart power-down when no input signal detected
Power-on reset
CLOCKING POWER
CONTROL
2
I C
SD
SSM2519
Low EMI emissions
MCLK
GAIN/SDA
LR_FORMAT/SCL
Figure 1.
GENERAL DESCRIPTION
The SSM2519 is a digital input, Class-D power amplifier that com-
bines a digital-to-analog converter (DAC) and a sigma-delta
(Σ-Δ) Class-D modulator. This unique architecture enables
extremely low, real-world power consumption from digital
audio sources with excellent audio performance. The SSM2519
is ideal for power sensitive applications, such as mobile phones
and portable media players, where system noise can corrupt
small analog signals such as those sent to an analog input audio
amplifier.
Input is provided via a serial audio interface, programmable to
accept all common audio formats including I2S, left justified (LJ),
right justified (RJ), TDM, and PCM. The SSM2519 is designed to
operate with or without a control interface such as I2C, which is
typically required for this type of device. Several control pins
offer selection of operation when I2C control is not used. The
SSM2519 can accept a variety of input MCLK frequencies and
can use BCLK as the clock source in some configurations. Both
the input sample rate and MCLK rates are automatically
detected.
Using the SSM2519, 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 a completely 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 interference, the lowest quiescent
power dissipation, and the highest audio efficiency without
sacrificing audio quality.
The architecture of the SSM2519 provides a solution that offers
lower power and higher performance than existing DAC plus
Class-D solutions. Its digital interface also offers 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.
The SSM2519 is specified over the industrial temperature range
of −40C to +85C. It has built-in thermal shutdown and output
short-circuit protection. It is available in a 12-ball, 1.4 mm ×
1.7 mm wafer level chip scale package (WLCSP).
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
rights of third parties that may result from its 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 and registeredtrademarks arethe 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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