BD3881FV_11 Datasheet, PDF (4/5 Pages) Rohm – Silicon Monolithic Integrated Circuit

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Pin number・Pin name
Pin number Pin name
1
PB1N
2
PB1P
3
PB2P
4
PB2N
5
PB2O
6
PB1O
Pin number
7
8
9
10
11
12
Pin name
VOLIN1
VOLIN2
GND
TRE1
TRE2
VDD
Pin number
13
14
15
16
17
18
Pin name
CONT
VEE
BAS2
OUT2
BAS1
OUT1
Pin number
19
20
21
22
23
24
Pin name
INA1
INA2
INB1
INB2
INC1
INC2
Pin number
25
26
27
28
Pin name
REC2O
REC2N
REC1N
REC1O
Cautions on use
1．About operating voltage range and operating temperature range
Within the Operating Voltage Range and the Operating Temperature Range, while basic circuit
functional operations are supposed to be guaranteed, the standard values of the electrical
characteristics are guaranteed only when used under the specific conditions defined within these
ranges. Thus, the users must verify those conditions before setting constants, elements, voltages, and
temperatures. Note that the conditions of power dissipation are also affected with temperatures.
2．About power on reset
A built-in circuit for performing initialization inside the IC at power-ON is provided. In the case of the
set design, however, to be on the safe side, it is recommended that data shall be sent to all the
addresses as initial data at power-ON and, until this sending operation is completed, the mute shall be
applied.
Function
Initial Condition
Input Selector
MUTE
REC Output
REC MUTE
Karaoke
Stereo
Volume
-dB
Treble Gain
0dB
Bass Gain
0dB
3．About 1-wire serial control
As the CONT terminal is designed for inputting a high-frequency digital signal, the wiring and layout
patterns should be routed not to cause interference with the analog-signal-related lines.
4．About power ON/OFF
Shock sound absorbing measures at power ON/OFF are implemented on 5pin, 6pin, 16pin, 18pin, 25pin,
and 28pin. When booting up power supplies, the VEE side should be booted a little bit earlier than the
other side. If the VDD side is booted up first, an excessive current may pass VDD through VEE. When
booting off the power supply, the VDD side should be booted off a little bit earlier than the other side.
Note that, at this time, voltage change passing through the GND level may produce an abnormally large
current.
5．About function switching
On switching between the Volume, Bass, Treble, and REC Mute functions, the action has been taken to
absorb such switching shock sound. For the other function switching operations, a combined use of
MUTE is recommendable. As measures against the switching shock sound of Karaoke, the bias
resistances on 19pin through 24pin should be set to 10k or less.
REV. C