Digital Input Stereo, 2 W, Class-D Audio Power Amplifier Datasheet SSM2518 FEATURES GENERAL DESCRIPTION Filterless, digital input Class-D amplifier The SSM2518 is a digital input, Class-D power amplifier that com- Serial digital audio interface supports common formats bines a digital-to-analog converter (DAC) and a sigma-delta 2 I S, left justified, right justified, TDM1-16, and PCM (-) Class-D modulator. This unique architecture enables 2 channels 2 W into 4 and 2 channels 1.4 W into 8 extremely low real-world power consumption from digital with 1% THD+N, when using a 5 V supply audio sources with excellent audio performance. The SSM2518 2 I C control interface or standalone operation is ideal for power sensitive applications, such as mobile phones 91% efficiency at full scale into an 8 load and portable media players, where system noise can corrupt 97 dB signal-to-noise ratio (SNR), A-weighted small analog signals such as those sent to an analog input audio 80 dB power supply rejection ratio (PSRR) at 217 Hz amplifier. Digital volume control: 71.25 dB to +24 dB in 0.375 dB steps Using the SSM2518, audio data can be transmitted to the amplifier Supports a wide range of sample rates from 8 kHz to 96 kHz over a standard digital audio serial interface, thereby significantly Automatic sample rate detection reducing the effect of noise sources such as GSM interference or Can operate using 64 f BCLK as the MCLK source S other digital signals on the transmitted audio. The closed-loop 2.5 V to 5.5 V speaker supply voltage (PVDD) digital input design retains the benefits of an all digital amplifier, 1.62 V to 3.6 V digital supply voltage (DVDD) yet enables very good PSRR and audio performance. The three Pop-and-click suppression level, - Class-D modulator is designed to provide the least Short-circuit and thermal protection with programmable amount of EMI interference, the lowest quiescent power dissi- autorecovery pation, and the highest audio efficiency without sacrificing Smart power-down when no input signal is detected audio quality. Power-on reset Input is provided via a serial audio interface, programmable to Low power modes for performance/power trade-offs 2 accept all common audio formats including I S and TDM. Control User selectable ultralow EMI emission mode 2 of the IC is provided via an I C control interface. The SSM2518 Programmable dynamic range compression (DRC) with can accept a variety of input MCLK frequencies and can use noise gate, expander, compressor, and limiter BCLK as the clock source in some configurations. Available in two packages 16-bump, 2.2 mm 2.2 mm, 0.5 mm pitch WLCSP Additional features include a soft digital volume control, de- 20-lead, 4.0 mm 4.0 mm LFCSP emphasis, and a programmable digital dynamic range compressor. APPLICATIONS The architecture of the SSM2518 provides a solution that offers Mobile phones lower power and higher performance than existing DAC plus Portable media players Class-D solutions. Its digital interface also offers a better system Laptop PCs solution for other products whose sole audio source is digital, Wireless speakers such as wireless speakers, laptop PCs, portable digital televisions, Portable gaming and navigation systems. Small LCD televisions Navigation systems Rev. 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Technical Support www.analog.com SSM2518 Datasheet TABLE OF CONTENTS Features .............................................................................................. 1 Digital Audio Formats ................................................................... 20 Applications ....................................................................................... 1 Stereo Mode ................................................................................ 20 General Description ......................................................................... 1 TDM, 50% Duty Cycle Mode ................................................... 20 Revision History ............................................................................... 3 TDM, Pulse Mode ...................................................................... 20 Functional Block Diagram .............................................................. 4 PCM, Multichannel Mode ........................................................ 21 Specifications ..................................................................................... 5 PCM Mono Mode ...................................................................... 21 2 Performance Specifications ......................................................... 5 I C Configuration Interface .......................................................... 22 Power Supply Requirements ....................................................... 6 Overview ..................................................................................... 22 Digital Input/Output .................................................................... 6 Register Summary (REG MAP) .................................................. 25 Digital Interpolation Filter .......................................................... 6 Register (REG MAP) Details ....................................................... 26 Digital Timing ............................................................................... 7 Software Reset and Master Software Power-down Control Register ........................................................................................ 26 Absolute Maximum Ratings ....................................................... 8 Edge Speed and Clocking Control Register ............................ 27 Thermal Resistance ...................................................................... 8 Serial Audio Interface and Sample Rate Control Register .... 28 ESD Caution .................................................................................. 8 Serial Audio Interface Control Register .................................. 29 Pin Configuration and Function Descriptions ............................. 9 Channel Mapping Control Register ......................................... 30 Typical Performance Characteristics ........................................... 11 Left Channel Volume Control Register ................................... 31 Theory of Operation ...................................................................... 14 Right Channel Volume Control Register ................................ 32 Power Supplies ............................................................................ 14 Volume and Mute Control Register ......................................... 33 Power-Down Modes................................................................... 14 Fault Control 1 Register............................................................. 34 Power-On Reset/Voltage Supervisor ........................................ 14 Power and Fault Control Register ............................................ 35 Master and Bit Clock .................................................................. 14 DRC Control 1 Register ............................................................. 36 Typical Application Circuit ........................................................... 16 DRC Control 2 Register ............................................................. 37 Digital Audio Interface .................................................................. 17 DRC Control 3 Register ............................................................. 38 Channel Mapping ....................................................................... 17 DRC Control 4 Register ............................................................. 40 Sample Rate Detection ............................................................... 17 DRC Control 5 Register ............................................................. 41 Standalone Mode ........................................................................ 17 DRC Control 6 Register ............................................................. 42 Low Power Modes ...................................................................... 17 DRC Control 7 Register ............................................................. 44 Dynamic Range Control ............................................................ 17 DRC Control 8 Register ............................................................. 45 Mute Options .............................................................................. 18 DRC Control 9 Register ............................................................. 46 Volume Control .......................................................................... 18 Packaging and Ordering Information ......................................... 47 De-emphasis Filter ..................................................................... 18 Outline Dimensions ................................................................... 47 Analog Gain ................................................................................ 18 Ordering Guide .......................................................................... 48 Fault Detection and Recovery ................................................... 19 Rev. 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