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SSM2518 Datasheet(PDF) 1 Page - Analog Devices |
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SSM2518 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 48 page  Digital Input Stereo, 2 W, Class-D Audio Power Amplifier Data Sheet SSM2518 Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2011 Analog Devices, Inc. All rights reserved. FEATURES Filterless, digital input Class-D amplifier Serial digital audio interface supports common formats I2S, left justified, right justified, TDM1-16, and PCM 2 channels × 2 W into 4 Ω and 2 channels × 1.4 W into 8 Ω with 1% THD+N, when using a 5 V supply I2C control interface or standalone operation 91% efficiency at full scale into an 8 Ω load 97 dB signal-to-noise ratio (SNR), A-weighted 80 dB power supply rejection ratio (PSRR) at 217 Hz Digital volume control: −71.25 dB to +24 dB in 0.375 dB steps Supports a wide range of sample rates from 8 kHz to 96 kHz Automatic sample rate detection Can operate using 64 × fS BCLK as the MCLK source 2.5 V to 5.5 V speaker supply voltage (PVDD) 1.62 V to 3.6 V digital supply voltage (DVDD) Pop-and-click suppression Short-circuit and thermal protection with programmable autorecovery Smart power-down when no input signal is detected Power-on reset Low power modes for performance/power trade-offs User selectable ultralow EMI emission mode Programmable dynamic range compression (DRC) with noise gate, expander, compressor, and limiter Available in two packages 16-bump, 2.2 mm × 2.2 mm, 0.5 mm pitch WLCSP 20-lead, 4.0 mm × 4.0 mm LFCSP APPLICATIONS Mobile phones Portable media players Laptop PCs Wireless speakers Portable gaming Small LCD televisions Navigation systems GENERAL DESCRIPTION The SSM2518 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 SSM2518 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 SSM2518, 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 interference, the lowest quiescent power dissi- pation, 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 and TDM. Control of the IC is provided via an I2C control interface. The SSM2518 can accept a variety of input MCLK frequencies and can use BCLK as the clock source in some configurations. Additional features include a soft digital volume control, de- emphasis, and a programmable digital dynamic range compressor. The architecture of the SSM2518 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. |
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