1、Rohm BD34301EKV 32位768kHz取樣立體聲音頻DAC解決方案Rohm公司的BD34301EKV是32位高音質768kHz取樣立體聲音頻DAC,用于高端音頻設備,具有極好的數值性能(SNR為130dB(典型值),THD+N為-115 dB(典型值).最喜愛的聲音由開關2種數字FIR濾波器(快速衰減, 慢速衰減)來選擇. PCM I/F支持高達768kHz而DSD I/F支持2.8 MHz, 5.6 MHz, 11.2 MHz和高達 22.4MHz.取樣頻率從32kHz到768kHz.器件支持立體聲模式(2路)和單聲模式(1路). AVCC的電源電壓為4.5V-5.5V, DVD

2、D的電源電壓為1.4V-1.6V,DVDDIO電源電壓為3.0V-3.6V,動態范圍為130dB,工作溫度為-25 C 到 +85 C.主要用在CD/SACD播放器,數字音頻播放器(DAP)和USB-DAC和其它設備.本文介紹了BD34301EKV主要特性,框圖,測量電路圖和多種應用電路,以及其評估板BD34301EKV主要特性和框圖,硬件建立圖,評估板電路圖,材料清單和PCB設計圖. BD34301EKV is 32-bit high sound quality Stereo AudioD/A converter with ROHM original sound quality d

3、esign,realizing excellent numerical performance (SNR: 130 dB(Typ), THD+N: -115 dB (Typ) suitable for high-end audio.Favourite sound is selectable by switching 2 kinds ofdigital FIR filters (Sharp Roll-Off, Slow Roll-Off). PCM I/Fsupports up to 768 kHz and DSD I/F supports up to 22.4MHz.The BD34301EK

4、V delivers superior performance in audio equipment by improving sound quality in ways that cannot be defined by numerical characteristics (130dB S/N ratio, -115dB THD+N). For example, in the D/A conversion circuit, ROHM was able to minimize the power supply impedance of each constituent current segm

5、ent while optimizing the wiring layout to reduce the clock delay (error that determines the timing operation of each current segment) as much as possible. In addition, the digital filter (FIR filter), a key function of the digital signal processing circuit, is designed to faithfully process even the

6、 smallest signals by achieving a rejection band attenuation of -150dB or less (a performance indicator of digital filters). This makes it possible to extract the full amount of information from sound sources and deliver sound quality characteristics that allow one to hear elements such as spatial re

7、verberation, quietness, and dynamic range important when listening to classical music.BD34301EKV主要特性:n MUS-ICTM Seriesn SNR 130 dB (Typ), THD+N -115 dB (Typ) (Note 1)n Sampling Frequency 32 kHz to 768 kHz(Note 1)n 2 Kinds of Digital FIR Filters (Note 1)n DSD 2.8 MHz, 5.6 MHz, 11.2 MHz, 22.4 MHzAvail

8、ablen Supports Stereo Mode (2ch) and Mono Mode (1ch)n Selectable 4 Device Addresses (38h, 3Ah, 3Ch, 3Eh)BD34301EKV主要指標:n Supply Voltage Range of AVCC(Note 2) 4.5 V to 5.5 Vn Supply Voltage Range of DVDD 1.4 V to 1.6 Vn Supply Voltage Range of DVDDIO 3.0 V to 3.6 Vn SNR(Note 1) 130 dB (Typ)n THD+N(No

9、te 1) -115 dB (Typ)n Dynamic Range(Note 1) 130 dB (Typ)n Operation Temperature Range -25 C to +85 CBD34301EKV應用:n CD/SACD Playern Digital Audio Player (DAP)n USB-DAC and Others 圖1. BD34301EKV應用電路 圖2. BD34301EKV框圖 圖3. BD34301EKV測量電路圖 圖4. BD34301EKV框圖 圖5. BD34301EKV單模式x2-A應用電路 圖6. BD34301EKV單模式x2-B應用電路 圖7. BD34301EKV四路輸出應用電路 圖8. BD34301EKV八路輸出應用電路 圖9.評估板BD34301EKV框圖 圖10.評估板BD34301EKV外形圖  圖11.評估板BD34301EKV硬件建立圖 圖12.評估板BD34301EKV電路圖評估板BD34301EKV材料清單:   圖13.評估板BD34301EKV PCB設計圖(1) 圖14.評估板BD34301EKV PCB設計圖(2)