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SSM2311-MINI-EVALZ 데이터시트(PDF) 1 Page - Analog Devices |
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1 / 20 page Filterless High Efficiency Mono 3 W Class-D Audio Amplifier SSM2311 Rev. 0 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 ©2008 Analog Devices, Inc. All rights reserved. FEATURES Filterless Class-D amplifier with Σ-Δ modulation No sync necessary when using multiple Analog Devices, Inc., Class-D amplifiers 3 W into 3 Ω load and 1.4 W into 8 Ω load at 5.0 V supply with less than 10% total harmonic distortion (THD) 90% efficiency at 5.0 V, 1.4 W into 8 Ω speaker Better than 98 dB signal-to-noise ratio (SNR) Single-supply operation from 2.5 V to 5.5 V 20 nA ultralow shutdown current Short-circuit and thermal protection Available in 9-ball, 1.5 mm × 1.5 mm WLCSP Pop-and-click suppression Built-in resistors reduce board component count Default fixed 18 dB or user-adjustable gain setting APPLICATIONS Mobile phones MP3 players Portable gaming Portable electronics Educational toys GENERAL DESCRIPTION The SSM2311 is a fully integrated, high efficiency, Class-D audio amplifier. It is designed to maximize performance for mobile phone applications. The application circuit requires a minimum of external components and operates from a single 2.5 V to 5.5 V supply. It is capable of delivering 3 W of continuous output power with less than 1% THD + N driving a 3 Ω load from a 5.0 V supply. The SSM2311 features a high efficiency, low noise modulation scheme that does not require any external LC output filters. The modulation continues to provide high efficiency even at low output power. It operates with 90% efficiency at 1.4 W into 8 Ω or 85% efficiency at 3 W into 3 Ω from a 5.0 V supply and has an SNR that is better than 98 dB. Spread-spectrum pulse density modulation is used to provide lower EMI-radiated emissions compared with other Class-D architectures. The SSM2311 has a micropower shutdown mode with a typical shutdown current of 20 nA. Shutdown is enabled by applying a logic low to the SD pin. The device also includes pop-and-click suppression circuitry. This minimizes voltage glitches at the output during turn-on and turn- off, thus reducing audible noise on activation and deactivation. The fully differential input of the SSM2311 provides excellent rejection of common-mode noise on the input. Input coupling capacitors can be omitted if the dc input common-mode voltage is approximately VDD/2. The default gain of SSM2311 is 18 dB, but users can reduce the gain by using a pair of external resistors (see the Gain section). The SSM2311 is specified over the industrial temperature range (−40°C to +85°C). It has built-in thermal shutdown and output short-circuit protection. It is available in a 9-ball, 1.5 mm × 1.5 mm wafer level chip scale package (WLCSP). FUNCTIONAL BLOCK DIAGRAM SHUTDOWN FET DRIVER MODULATOR 0.1µF VDD GND OSCILLATOR POP-AND-CLICK SUPPRESSION OUT+ OUT– BIAS IN+ VBATT 2.5V TO 5.0V IN– 10µF 22nF1 300kΩ 300kΩ 37.5kΩ 37.5kΩ 1 INPUT CAPS ARE OPTIONAL IF INPUT DC COMMON-MODE VOLTAGE IS APPROXIMATELY VDD/2. 22nF1 SD AUDIO IN– AUDIO IN+ SSM2311 REXT REXT GAIN = 300kΩ (37.5kΩ + REXT) Figure 1. |
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