BH3868BFS Rohm Semiconductor, BH3868BFS Datasheet - Page 18

• Manufacturer Part Number: BH3868BFS
• Description: IC AUDIO SOUND PROCESSR SSOP-A32
• Manufacturer: Rohm Semiconductor
• Type: Volume Controlr

Specifications of BH3868BFS

• Applications: Automotive Audio
• Mounting Type: Surface Mount
• Package / Case: 32-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Audio ICs
! ! ! ! AGC
(1) Level Setting
The AGC suppression level can be set by the voltage of the AGDADJ terminal (31pin). Assuming that the suppression
level is GC (mVrms) and the AGCADJ voltage is ADJ (V), setting can be expressed as follows:
The under-mentioned table shows a guideline of setting.
The level specified by the electrical characteristic is AGCADJ=3.45 (V) and the suppression level is approximately 200
(mVrms). Use the suppression level in a rage from 100 (mVrms) to 400 (mVrms). The under-mentioned chart shows the
characteristic when the suppression level is set to 100 (mVrms), 200 (mVrms), 300 (mVrms) and 400 (mVrms).
2) Automatic Increment (The Select Address is incremented (by one) according to the number of data.)
3) Configuration Unavailable for Transfer (In this case, the Select Address 1 only is set.)
S
S
Example : <1> Data 1 shall be set as the data of the address specified by the Select Address.
MSB
MSB
Note : If any data is sent as the Select Address 2 immediately after the Data, such data is recognized as the Data,
Slave Address
Slave Address
not the Select Address 2.
GC=−286×ADJ+1186
0.001
<3> Data N shall be set as the data of the address specified by the Select Address +N−1.
<2> Data 2 shall be set as the data of the address specified by the Select Address +1.
0.01
0.1
10
0.001
1
LSB
VOLUME=MAX.
TONE=FLAT
BBE=OFF
SURROUND=OFF
AGC=ON
f=1kHz
A
MSB
LSB
Select Address
Suppression Level (mVrms )
A
MSB
0.01
100
200
300
400
Select Address
LSB
A
MSB
Fig.2 AGC characteristics
Data
LSB
LSB
INPUT (V
AGCADJ Terminal Voltage (V)
0.1
A
A
rms
MSB
MSB
)
3.45
2.75
Data1, Data2, · · · · · , DataN
Select Address 2
3.8
3.1
1
LSB
A
BH3868BFS
MSB
Data
10
LSB
LSB
A
A
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P
P