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TAS5708

更新时间： 2024-09-16 06:15:31
品牌 Logo 应用领域
德州仪器 - TI 放大器功率放大器
页数 文件大小 规格书
56页 1138K
描述
20-W STEREO DIGITAL AUDIO POWER AMPLIFIER WITH EQ/DRC and FEEDBACK

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TAS5708 数据手册

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TAS5708  
www.ti.com ........................................................................................................................................................................................... SLOS570–DECEMBER 2008  
20-W STEREO DIGITAL AUDIO POWER AMPLIFIER WITH EQ/DRC and FEEDBACK  
1
FEATURES  
•
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  
Rates Eliminates the Need to Update  
Coefficients When Sample Rate Changes  
Power-Stage Feedback Allows Operation  
From Poorly Regulated Power Supplies  
•
Audio/PWM Processing  
–
–
Autodetect: Automatically Detects  
Sample-Rate Changes Eliminating the Need  
for External Microprocessor Intervention  
–
Factory-Trimmed Internal Oscillator for  
Automatic Rate Detection  
–
–
–
High-End 32-Bit Data Path Audio Processor  
14 Biquads for Speaker EQ  
Closed-Loop Power Stage: Enables Wide  
PVCC Operating Range and Reduced  
Power Supply Ripple Distortion  
Dynamic Range Control (DRC)  
DESCRIPTION  
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.  
20  
10  
Fundamental  
Audio Input  
Closest Open-Loop  
Competitor  
Closest Open-Loop  
Competitor  
0
TI Closed-Loop  
TI Closed-Loop  
−20  
−40  
−60  
−80  
−100  
−120  
−140  
2nd Order  
Sideband  
1
40 dB  
Inprovement  
3rd Order  
Sideband  
0.1  
Audio Input = 10 kHz  
Supply Ripple = 1 kHz, 500 mVpp  
PO = 3 W  
Supply Ripple = 1 kHz, 500 mVpp  
0.01  
5k  
6k  
7k 8k 9k 10k 12k  
f − Frequency − Hz  
15k  
20k  
20  
100  
1k  
10k 20k  
f − Frequency − Hz  
G018  
G019  
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.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2008, Texas Instruments Incorporated  
 
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TAS5708 替代型号

型号 品牌 替代类型 描述 数据表
TAS5710 TI

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TPA3100D2 TI

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