BU7858KN_07 Datasheet, PDF (10/25 Pages) Rohm – Mixer & Selector With 16bit D/A Converters

【BU7893GU】
1.MMSSBBフfirsァt lーeftスjuトsti前fied詰foフrmォaーt マット
LRCLK
BCLK
01 23
Lch
13 14 15 16 17 18
29 30 31 0 1 2 3
Rch
13 14 15 16 17 18
29 30 31 0
SDI
15 14 13
210
Don't
care
2. MMSSBフfirァst ーrigスht トjus後tifi詰edフfoォrmーatマット
SDI
Don't
care
15 14 13
Don't
care
15 14 13
210
Don't
care
210
Don't
care
Don't
care
15
Don't
care
15 14 13
2
1
0
Don't
care
3. IISフforォmーat マット
LRCLK
BCLK
01 23 4
Lch
14 15 16 17 18 19
30 31 0 1 2 3 4
Rch
14 15 16 17 18 19
30 31 0
SDI
Don't
care
15 14 13
210
Don't
care
Don't
care
15 14 13
210
Don't
care
Don't
care
Fig.29 AUDIO I/F Format (BU7893GU)
●3D SURROUND ENHANCEMENT FUNCTION
【BU7893GU】
Even under the circumstances of adjacent arrangement of stereo speakers, the wide-spreading acoustic effect can be
achieved because of the output resulting from the digital audio input to which the 3D surround effect has been applied.
Moreover, the stereo sound at the time of audio recording can also be played truly. Please tell us about the parameter
setting when you use this function.
●LOW-BAND CORRECTIVE CIRCUIT
In the headphone output terminals (HP_L, HP_R or HPOL, HPOR), there is a low-band corrective circuit, which corrects
the low-band attenuation.
200kΩ
200kΩ
CCHPx
CA_X
or
CCX
100kΩ
-
+
CL
+
OUTPUT
Fig.30
HP_X
RL
or
HPOX
BU7858KN & BU7893GU Headphone Output Equivalent Circuit
Low-band cut-off frequency
Low-band boost frequency
Boost gain
fC= 1/(2･π･CL･RL)
fBOOST = 1/(2･π･CCHPx･200kΩ)
ABOOST = 20･log((200 kΩ+1/(2･π･f･CCHPx))/100 kΩ)
（the maximum low-band boost is 6dB）
For parameter setting, determine the output coupling capacitance CL and the headphone impedance R_L before calculating
the low-band cut-off frequency fC. Then determine CCHPx so that the low-band cut-off frequency fC is roughly in agreement
with the low-band boost frequency fBOOST.
The recommended parameter setting of BU7858KN and BU7893GU is CCHPx = 6800pF at the time of CL = 100μF and RL
= 16Ω.
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