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SSM3525 Datasheet(PDF) 1 Page - Analog Devices |
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SSM3525 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 60 page  30 W, Filterless, Class D, Output Sensing Audio Amplifier Data Sheet SSM3525 Rev. A Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother 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 ©2018 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com FEATURES Filterless digital input, mono Class D amplifier with Σ-Δ modulation Digitized output of output voltage, output current, and PVDD supply voltage Operates from 4.5 V to 17 V supply, such as a 2-cell or 3-cell battery Input/output supply operation from 1.1 V to 1.98 V 30.2 W output power, 17 V supply and 4 Ω load at 1% THD + N 37.5 μV rms noise, 107 dB A weighted signal-to-noise ratio I2C control with up to 4 pin-selectable addresses Multiple serial data formats TDM, I2S, or left justified slave PDM input/output operating from 2.048 MHz to 6.144 MHz Support sample rates from 8 kHz to 192 kHz Flexible digital and analog gain adjustment AGC with battery voltage-based limiter 74 dB SNR on output current sensing and 85 dB SNR on voltage sensing 6.62 mA quiescent current at 12 V PVDD supply Temperature sensor with 1°C readout Short-circuit, thermal protection, and thermal warning 23-ball, 2.26 mm × 2.38 mm, 0.4 mm pitch WLCSP Pop and click suppression User-selectable ultralow EMI emissions mode Power-on reset APPLICATIONS Mobile computing Portable electronics GENERAL DESCRIPTION The SSM3525 is a fully integrated, high efficiency, mono Class D audio amplifier with digital input and digitized output of output voltage, output current, and PVDD supply. The application circuit requires few external components and can operate from 4.5 V to 17 V (PVDD) and 1.8 V (IOVDD) supplies. It is capable of delivering 8.3 W of continuous output power into an 8 Ω load (or 15.3 W into 4 Ω) with <1% total harmonic distortion + noise (THD + N) from a 12 V supply, or 30.2 W into an 4 Ω load from a 17 V power supply, all with <1% THD + N. The SSM3525 features a high efficiency, low noise modulation scheme that requires no external inductor/capacitor (LC) output filters. This scheme continues to provide high efficiency even at low output power. It operates with 92% efficiency at 9 W into an 8 Ω load, 12V or 89% efficiency at 20 W into 4 Ω from a 17 V supply, and it has an signal-to-noise ratio (SNR) of 107 dB, A weighted. Spread spectrum pulse density modulation provides lower electromagnetic interference (EMI) radiated emissions compared with other Class D architectures, particularly above 100 MHz. The digital input eliminates the need of an external digital-to- analog converter (DAC). The SSM3525 has a micropower shutdown mode with a typical shutdown current of 90 nA at 12 V PVDD supply. Individual sense blocks can be powered down to save power when sense is not needed. The device also includes pop and click suppression circuitry that minimizes voltage glitches at the output during turn on and turn off. Current sensing is accomplished using an integrated analog-to- digital converter (ADC) and internal sense resistor. The digitized voltage and current information can be returned in various serial audio formats, including I2S, time division multiplexing (TDM) and pulse density modulation (PDM). The SSM3525 includes an integrated regulator to generate the required 5 V analog supply. Alternatively, if an external 5 V rail from a dc-to-dc converter is available, it can improve system efficiency. The SSM3525 is designed to operate with an I2C control interface and specified over the temperature range of −40°C to +85°C. It has built-in thermal shutdown and output short-circuit protection. It is available in a halide free, 23-ball, 2.26 mm × 2.38 mm wafer-level chip scale package (WLCSP). |
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