- Evaluation Board User's Guide for BD34301EKV-EVK-001
BD34301EKV is 32-bit high sound quality Stereo Audio D/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. Favorite sound is selectable by switching 2 kinds of digital FIR filters (Sharp Roll-Off, Slow Roll-Off). PCM I/F supports up to 768 kHz and DSD I/F supports up to 22.4 MHz.
It is the masterpiece of ROHM audio IC which pursues both the numerical values and sound quality performance required in an audio device to the utmost limits and created through the ardency of ROHM engineeers. That is ROHM Musical Device "MUS-IC".
"MUS-IC" Web Page
The BD34301EKV DAC chip, developed as part of ROHM’s high-grade MUS-ICT™ series representing the pinnacle of audio ICs, emphasizes ‘spatial reverberation’, ‘quietness’, and ‘dynamic range’ – qualities important for reproducing classical music. Original sound quality design technology makes it possible to successfully reproduce the target sound quality by incorporating a circuit in the signal processing block to check for audio quality. At the same time, class-leading low noise and distortion (130dB SN ratio, -115dB THD+N) provide the high performance demanded by high fidelity audio equipment. At last, the customizable digital filter – a key function of the digital signal processing circuit – supports the creation of the ideal sound sought by audio equipment manufacturers.
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 reverberation’, ‘quietness’, and ‘dynamic range’ important when listening to classical music.
The BD34301EKV enables selection of the digital filter (FIR filter) in the digital signal processing circuit from preset/custom/external settings. At the same time, both the filter’s calculation coefficients and oversampling rate are programmable. Constructing a unique digital filter makes it possible to achieve different sound quality tunings for each audio equipment, reducing development load while contributing to the creation of ideal sound sought by audio manufacturers.
BD34301EKV is a 32-bit Stereo Audio D/A Converter with ROHM original sound quality design, realizing excellent performance (SNR: 130 dB (Typ), THD+N: -115 dB (Typ))*1 suitable for high-end audio. Different type sound is realized by selecting 2 kinds of digital FIR filters (Sharp Roll-Off, Slow Roll-Off). PCM I/F supports up to 768 kHz and DSD I/F supports up to 22.4 MHz