BD3401KS2 ROHM Co. Ltd., BD3401KS2 Datasheet - Page 15

• Manufacturer Part Number: BD3401KS2
• Description: Single Power Supply Sound Processor Built-in Pre Amplifier For Tape Recording And Play Back
• Manufacturer: ROHM Co. Ltd.

●Thermal derating characteristic
13. Constraints of serial control
(1) On soft-switching of the BASS BOOST, SURROUND and AMS functions, data must not be serially sent to the
(2) When switching AMS ON and OFF, a shock sound will be generated.
functions involved before the switching operation is completed.
Data (1) to (8) can be serially sent immediately after sending Data (9).
Using MUTE provided on VOLUME, control data should be sent in order to avoid outputting the shock sound
from VOLOUT1,2 (pin32,33) as described in the figure below:
Direction
VOLUME
MUTE
DATA
Direction
The time interval: T(sec) between Data (9) must be set to have a suffiecient delay
time. For example, 100ms or more when C on pin57 is 0.33µF.
AMS OFF → ON
Time: T
arbitrary number
For functions that need to use soft-switch, data (Data (9)) can be serially sent
on the same select address.
T
1
1
1600
1400
1200
1000
is an
800
600
400
200
Data(9)
0
AMS
0
ON
SQFP-T64
When installed on the ROHM standard board
(size: 70×70×1.6mm, Glass epoxy board)
25
Fig.23
50
T
Ta [℃]
Fig.24
15/16
Fig.25
75
100
Data (9)
Time: T
when C on pin57 is 0.33µF.
AMS
OFF
2
should be 100ms or more
125
AMS ON → OFF
T
2
SETTING
VOLUME
DATA