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TAS5708 データシート(PDF) 1 Page - Texas Instruments |
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TAS5708 データシート(HTML) 1 Page - Texas Instruments |
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1 / 56 page  1 FEATURES DESCRIPTION −140 −120 −100 −80 −60 −40 −20 0 20 f − Frequency − Hz G018 5k 15k 20k 12k 10k 9k 8k 7k 6k Closest Open-Loop Competitor TIClosed-Loop Fundamental AudioInput 40dB Inprovement 2 nd Order Sideband AudioInput=10kHz SupplyRipple=1kHz,500mVpp 3 rd Order Sideband f − Frequency − Hz 20 100 1k 10k 20k G019 0.01 10 0.1 1 P =3W O SupplyRipple=1kHz,500mVpp ClosestOpen-Loop Competitor TIClosed-Loop TAS5708 www.ti.com ........................................................................................................................................................................................... SLOS570 – DECEMBER 2008 20-W STEREO DIGITAL AUDIO POWER AMPLIFIER WITH EQ/DRC and FEEDBACK • Audio Input/Output • Benefits – 20-W Into an 8- Ω Load From an 18-V Supply – EQ: Speaker Equalization Improves Audio Performance – Wide PVCC Range (10 V to 26 V); 3.3 V Digital Supply – DRC: Enables Speaker Protection and Night-Mode Listening. – Supports One Serial Audio Input (8 kHz - 48 kHz Sample Rates) (LJ/RJ/I2S) – Autobank Switching: Preloaded Coefficients for Three Different Sample – Power-Stage Feedback Allows Operation Rates Eliminates the Need to Update From Poorly Regulated Power Supplies Coefficients When Sample Rate Changes • Audio/PWM Processing – Autodetect: Automatically Detects – Factory-Trimmed Internal Oscillator for Sample-Rate Changes Eliminating the Need Automatic Rate Detection for External Microprocessor Intervention – High-End 32-Bit Data Path Audio Processor – Closed-Loop Power Stage: Enables Wide – 14 Biquads for Speaker EQ PVCC Operating Range and Reduced – Dynamic Range Control (DRC) Power Supply Ripple Distortion The TAS5708 is a 20-W, efficient, digital audio power amplifier for driving stereo bridge-tied speakers. A 32-bit datapath eliminates the need for pre-scaling before processing and preserves signal integrity without sacrificing dynamic range. A digital audio processor with fully programmable digital filters allows designers to custom tune speakers for optimum sound in small enclosures. A programmable DRC can adjust power levels for a scaleable design while also enabling night-mode listening modes. The closed-loop architecture allows the device to operate from poorly regulated supplies. Figure 1 below shows the benefit of the feedback architecture when a noisy supply (1kHz, 500mVpp ripple) modulates a 10kHz audio input. The figure shows a 40dB improvement in sideband suppression when compared to an open-loop design. This correlates directly to a 24dB improvement in distortion as seen in Figure 2. Figure 1. Supply Ripple Intermod Distortion Figure 2. THD+N vs Frequency 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Copyright © 2008, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
同様の部品番号 - TAS5708 |
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同様の説明 - TAS5708 |
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