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SSM2304 데이터시트(PDF) 1 Page - Analog Devices |
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SSM2304 데이터시트(HTML) 1 Page - Analog Devices |
1 / 20 page 2 W Filterless Class-D Stereo Audio Amplifier SSM2304 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 ©2006 Analog Devices, Inc. All rights reserved. FEATURES Filterless Class-D amplifier with built-in output stage 2 W into 4 Ω and 1.4 W into 8 Ω at 5.0 V supply with <10% THD 85% efficiency at 5.0 V, 1.4 W into 8 Ω speaker Better than 98 dB SNR (signal-to-noise ratio) Available in 16-lead, 3 mm × 3 mm LFCSP Single-supply operation from 2.5 V to 5.0 V 20 nA ultralow shutdown current Short-circuit and thermal protection Pop-and-click suppression Built-in resistors reduce board component count Default fixed 18 dB gain and user-adjustable APPLICATIONS Notebooks and PCs Mobile phones MP3 players Portable gaming Portable electronics Educational toys GENERAL DESCRIPTION The SSM2304 is a fully integrated, high efficiency, Class-D stereo audio amplifier. It is designed to maximize performance for portable applications. The application circuit requires a mini- mum of external components and operates from a single 2.5 V to 5.0 V supply. It is capable of delivering 2 W of continuous output power with less than 10% THD + N driving a 4 Ω load from a 5.0 V supply. The SSM2304 features a high efficiency, low noise modulation scheme. It operates with 85% efficiency at 1.4 W into 8 Ω from a 5.0 V supply and has a signal-to-noise ratio (SNR) that is better than 98 dB. PDM modulation is used to provide lower EMI- radiated emissions compared with other Class-D architectures. The SSM2304 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 architecture of the device allows it to achieve a very low level of pop and click. 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 SSM2304 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 SSM2304 also has excellent rejection of power supply noise, including noise caused by GSM transmission bursts and RF rectification. The SSM2304 has a preset gain of 18 dB, which can be reduced by using external resistors. The SSM2304 is specified over the commercial temperature range (−40°C to +85°C). It has built-in thermal shutdown and output short-circuit protection. It is available in a 16-lead, 3 mm × 3 mm lead-frame chip scale package (LFCSP). FUNCTIONAL BLOCK DIAGRAM FET DRIVER MODULATOR 0.1µF VDD VDD INTERNAL OSCILLATOR OUTR+ OUTR– OUTL+ OUTL– BIAS FET DRIVER MODULATOR INR+ VBATT 2.5V TO 5.0V INR– SHUTDOWN INL+ INL– GND GND 10µF 22nF1 1 INPUT CAPS ARE OPTIONAL IF INPUT DC COMMON-MODE VOLTAGE IS APPROXIMATELY VDD/2. 22nF1 300kΩ 300kΩ GAIN = 300kΩ/(47kΩ + Rext) 47kΩ 47kΩ 47kΩ 47kΩ Rext Rext Rext Rext 300kΩ 300kΩ 22nF1 22nF1 SD LEFT IN+ LEFT IN– RIGHT IN– RIGHT IN+ SSM2304 Figure 1. |
유사한 부품 번호 - SSM2304_15 |
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유사한 설명 - SSM2304_15 |
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