BU9408KS2_12 Datasheet, PDF (1/57 Pages) Rohm – 32bit Audio DSP with Built-in 4ch DAC and ASRC

Digital Sound Processors for FPD TVs
32bit Audio DSP with Built-in 4ch
DAC and ASRC
BU9408KS2
No.12083EAT02
●General Description
This LSI is the digital sound processor which made
the use digital signal processing for FPD TVs.
DSP of ROHM original is used for the TV sound processor unit, and it excels in cost performance. A selection input of two
lines is possible from four digital inputs. An asynchronous sampling rate converter(ASRC) is built in one line. Three digital
outputs are built in.
Two audio DA converters are built in.
●Features
■Digital Signal Processor unit
Word length:
32bit (Data RAM)
The fastest machine cycle: 40.7ns (512fs, fs = 48kHz)
Multiplier:
32 x 24 → 56bit
Adder:
32 + 32 → 32bit
Data RAM:
256 x 32bit
Coefficient RAM:
128 x 24bit
Sampling frequency:
fs = 48kHz
Master clock :
512fs（24.576MHz,fs=48kHz）
■Digital signal input (Stereo4lines):
16/20/24bit (I²S, Left-Justified, Right-Justified)
Digital signal output (Stereo 3 lines):
16/20/24bit (I²S, Left-Justified, Right-Justified, S/PDIF)
■.Asynchronous sampling rate converter
（one line at stereo）：32kHz/44.1kHz/48kHz/88.2kHz/96kHz/176.4kHz/192kHz → 48kHz
■Audio DAC：One stereo output
24bit 8 x Over-sampling digital filter + 1 bit delta sigma DAC
S/N： 96dB
THD+N： 0.005%（Sine-wave 1kHz,0dB）
■Audio 16bit DAC：One stereo output
24bit 8 x Over-sampling digital filter + Audio 16bit DAC
S/N： 90dB
THD+N： 0.03%（Sine-wave 1kHz,0dB）
■The sound signal processing function for FPD TVs
Pre-Scaler, DC cut HPF, Channel Mixer, P²Volume(Perfect Pure Volume), BASS, MIDDLE,
TREBLE, Simulated-Stereo, Surround, P²Bass, P²Treble, 7Band Parametric EQ,
Master Volume, L/R balance, Post-Scaler, Output signal clipper
(P²Volume, P²Bass, and P²Treble are the sound effect functions of ROHM original.)
●Applications
Flat Panel TVs (LCD, Plasma)
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
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2012.03 - Rev.A