基于DPPC2006的數(shù)字音頻功放電路的設計

摘  要

隨著電子技術和數(shù)字信號處理技術的發(fā)展，音頻功率放大器的發(fā)展進入了一個新時代，數(shù)字功率放大器已經(jīng)在很多場合下取代了模擬功率放大器，而且關于數(shù)字功率放大器的相關技術也在得到不斷改進和發(fā)展。
本系統(tǒng)以采用直接數(shù)字放大技術(DDX)的專用數(shù)字音頻信號處理放大芯片DPPC2006為核心，可直接輸入S/PDIF同軸或光纖數(shù)字信號。經(jīng)過內部運算，將PCM信號轉化為PWM信號輸送給高速VMOSFET管構成的互補對稱H橋電路放大，輸出放大后的雙通道音頻信號。通過使用不同的MOSFET，很容易得到80W～300W的輸出功率，理論上平均效率可達到90%以上，甚至后級放大管完全不需散熱片。使用單片機進行靈活控制，實現(xiàn)靜音、數(shù)字音量調節(jié)、顯示等功能.

關鍵詞  音頻功率放大器  DPPC2006  數(shù)字音頻功放

THE DESIGN OF DIGITAL AUDIO
POWER AMPLIFIER USING DPPC2006

ABSTRACT

With the development of electronic technology and digital signal processing technology, the development of audio power amplifier into a new era ,the digital power amplifier has been replaced the simulated power amplifier on many occasions, but also on the digital power amplifier technology has also been related to the continuous of improvement and development.
This system uses the special-purpose numeral tonic train signaling processing enlargement, DPPC2006 of the direct digital enlargement technology (DDX) as a core. It is can directly input S/PDIF coaxial or optical digital signal .After the internal operation, transport the PWM signal to the supplementary symmetrical H bridge electric circuit which constitutes for the high speed VMOSFET tube enlarges the PCM signal transformation, output the double channel tonic train signaling that is enlarged. Through use different MOSFET, we can get the output between 80W to 300W easily, theoretically, the average performance may achieve above 90%. Even the level amplifying tube completely does not need the radiator fin. Uses the monolithic integrated circuit can nimble control it, realizes the foundation that obtained the static sound, numeral volume control and demonstration.

KEY WORDS  the audio power amplifier  DPPC2006  the digital audio power amplifier
 
目  錄

中文摘要 I
英文摘要 II
1 緒論 1
1.1 數(shù)字功放的目的及其意義 1
1.2 數(shù)字功放的國內外發(fā)展現(xiàn)狀和前景 1
1.3 設計的主要內容 2
2 硬件電路設計 3
2.1 DPPC2006芯片外圍電路的設計 3
2.1.1  DPPC2006的數(shù)字音頻功放電路組成框圖 3
2.1.2  DPPC2006的引腳圖和功能框圖 4
2.1.3  DPPC2006的概述、特點和技術指標 7
2.1.4  DPPC2006的工作原理 9
2.2 DPPC2006專用時鐘電路設計 11
2.3 單片機控制及顯示電路的設計 12
2.3.1 單片機AT89S52的性能及功能特性 12
2.3.2 單片機AT89S52的外圍電路 13
2.3.3 單片機控制及顯示電路 14
2.4 A/D轉換電路設計 15
2.4.1 芯片CS5333的引腳圖及其特點 15
2.4.2 A/D轉換電路 16
2.5 后級電路的設計 16
2.5.1  H橋互補對稱電路的設計 16
2.5.2  低通濾波器的設計 18
2.6 電源電路的設計 20
2.6.1  單片式三端集成穩(wěn)壓器 20
2.6.2  +24V和+5V電源的設計 21
2.6.3  +6V和+3.3V電源的設計 21
3 系統(tǒng)軟件的設計 21
3.1 軟件設計流程圖 21
3.2 源程序的設計 22
4 結論 22
致  謝 23
參考文獻 24
附  錄1 25
附  錄2 26
附  錄3 27
附  錄4 28