This document introduces the features and characteristics of BU9414FV, a 32-bit audio DSP produced by ROHM. The chip is mainly used for audio processing in FPD TVs.
The BU9414FV is a digital sound processor LSI designed for flat‑panel TVs (LCD, Plasma). It provides 2.1‑channel digital audio output and includes functions such as volume control, equalization, and surround processing.
Key features include a 32‑bit word length, 256 × 32‑bit data RAM, 128 × 24‑bit coefficient RAM, a 48 kHz sampling rate, and support for I2S, Left‑Justified, Right‑Justified, and S/PDIF audio interfaces. The device operates from a 3.0‑3.6 V supply and is rated for temperatures from –25 °C to +85 °C.
| Word length | 32 bit (Data RAM) |
|---|---|
| Data RAM size | 256 × 32 bit |
| Coefficient RAM size | 128 × 24 bit |
| Sampling frequency | 48 kHz |
| Operating supply voltage | 3.0 ~ 3.6 V |
| Absolute maximum supply voltage | 45 V |
| Operating temperature range | -25 °C ~ +85 °C |
| Digital input level (H) | 2.5 V |
| Digital input level (L) | 0.8 V |
| Digital output level (H) | 2.75 V |
| Digital output level (L) | 0.4 V |
It supports digital audio input and output via I2S, Left‑Justified, Right‑Justified, and S/PDIF formats.
The device is rated for temperatures from –25 °C up to +85 °C.
It includes 256 words of 32‑bit data RAM.