The SSM2519 is a digital input, Class-D power amplifier that combines
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.
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.
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.
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).
Applications
- Mobile phones
- Portable media players
- Laptop PCs
- Wireless speakers
- Portable gaming
- Navigation systems
