32bit Audio DSP with Built-in 4ch DAC and ASRC - BU9408KS2

This LSI is the digital sound processor which madethe 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 twolines is possible from four digital inputs. An asynchronous sampling rate converter(ASRC) is built in one line. Three digitaloutputs are built in.
Two audio DA converters are built in.

* This product is a STANDARD grade product and not recommend for on-vehicle devices.
Part Number
Unit Quantity
Minimum Package Quantity
Packing Type
BU9408KS2 Active SQFP-T52 1000 1000 Tray Yes
Vcc(Min.)[V] 3.0
Vcc(Max.)[V] 3.6
Iq[mA] 40.0
I/F 2 wire port
Digital Audio I/F I2S SPDIF
Additional Feature P²Volume, P²Bass, P²Treble, 7band P-EQ, 3band Tone, Surround
Number of DACs 4
Sampling Rate(Max.)[kHz] 48
DAC SNR(Typ.)[dB] 96
DAC THD+N[%] 0.0050
Multi Input Stereo 3
Volume Range +24to-103 dB
Volume Step 0.5
Tone Control Band BASS, Middle, Treble
Operating Temperature (Min.)[°C] -25
Operating Temperature (Max.)[°C] 85
  • ・ 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.)
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Technical Data
Application Note

Thermal Resistance