Digital Input 2 W Class-D

Audio Power Amplifier

Data Sheet

SSM2519

Rev. 0

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FEATURES

Filterless digital input Class-D amplifier

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

Available in 12-ball 1.4 mm × 1.7 mm × 0.4 mm pitch WLCSP

Efficiency 90% at full scale into 8 Ω

9 mW loaded idle power at 1.8 V/3.6 V

SNR = 98 dB, A-weighted

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

Pop and click suppression

Short-circuit and thermal protection with autorecovery

Smart power-down when no input signal detected

Power-on reset

Low EMI emissions

APPLICATIONS

Mobile phones

Portable media players

Laptop PCs

Wireless speakers

Portable gaming

Navigation systems

FUNCTIONAL BLOCK DIAGRAM

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.

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

right justified (RJ), TDM, and PCM. The SSM2519 is designed to

typically required for this type of device. Several control pins

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 −40C to +85C. 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).

SSM2519

MCLK

LRCLK

VDD

GND

PVDD

BCLK

SDATA

SD

POWER-ON

RESET

CLOCKING POWER

CONTROL

GAIN/SDA

OUT+

OUT–

DAC

LR_FORMAT/SCL