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.
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.
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.
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.
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.
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.
The SSM2529 is specified over the industrial temperature range of
−40°C to +85°C. It has built-in thermal shutdown and output shortcircuit
protection. It is available in a 16-ball, 1.92 mm × 1.94 mm
wafer level chip scale package (WLCSP).
APPLICATIONS
- Mobile phones
- Portable media players
- Laptop PCs
- Wireless speakers
- Portable gaming
- Navigation systems
