Rohm BD34301EKV 32位768kHz取样立体声音频DAC解决方案

Rohm公司的BD34301EKV是32位高音质768kHz取样立体声音频DAC,用于高端音频设备,具有极好的数值性能(SNR为130dB(典型值),THD+N为-115 dB(典型值)).最喜爱的声音由开关2种数字FIR滤波器(快速衰減, 慢速衰減)来选择. PCM I/F支持高达768kHz而DSD I/F支持2.8 MHz, 5.6 MHz, 11.2 MHz和高达 22.4MHz.取样频率从32kHz到768kHz.器件支持立体声模式(2路)和单声模式(1路). AVCC的电源电压为4.5V-5.5V, DVDD的电源电压为1.4V-1.6V,DVDDIO电源电压为3.0V-3.6V,动态范围为130dB,工作温度为-25 C 到 +85 C.主要用在CD/SACD播放器,数字音频播放器(DAP)和USB-DAC和其它设备.本文介绍了BD34301EKV主要特性,框图,测量电路图和多种应用电路,以及其评估板BD34301EKV主要特性和框图,硬件建立图,评估板电路图,材料清单和PCB设计图.

BD34301EKV is 32-bit high sound quality Stereo AudioD/A converter with ROHM original sound quality design,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 BD34301EKV 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 segment 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 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 reverber...