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Structure
Product name
Model Name
Silicone monolithic integrated circuit
Audio sound processor for TV
BD3884FS
●Features
1. Built-in AGC circuit adjusting the sound difference among input sources
2. I
2
C BUS control with the control voltage of 3.3V-5.0V
3. Use the Bi-CMOS process
●Absolute
Maximum Ratings (Ta=25°C)
Parameter
Applied Voltage
Input Voltage
Power Dissipation
Operating Temperature
Storage Temperature
Symbol
VCC
VIN
Pd
Topr
Tastg
Limits
10.0
VCC+0.3½GND-0.3
1000 *1
-40½+85 *2
-55½+150
Unit
V
V
mW
°C
°C
*1 At Ta＝25°C or higher, this value is decreaced to 8.0mW/°C.
When Rohm standard board is mounted. Thermal resistance
ja
= 125 (°C/W).
Rohm standard board:
size: 70×70×1.6 (mm
3
)
material: FR4 glass-epoxy substrate (copper foil area: not more than 3%).
*2 As long as voltage stays within operating voltage range, certain circuit operation is guaranteed in the
operating temperature range.
Allowable loss conditions are related to temperature, to which care must be taken.
In addition though the standard value of its electrical characteristics cannot be guaranteed under the
conditions other than those specified, original functions are maintained.
●Operating
Voltage Range
Parameter
Power supply voltage *3
Symbol
VCC
Min.
7.0
Typ.
9.0
Max.
9.5
Unit
V
Basic operation shall be available at Ta=25°C.
*3 As long as temperature components must be set in accordance with the operating voltage and temperature
ranges before using this IC.
In addition, though the standard value of its electrical characteristics cannot be guaranteed under the
conditions other than those specified, original functions are maintained.
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●Function
Function
AGC
Front volume
Surround
Bass
Treble
Rear volume
4 step level variable
0dB to –87dB (1dB step), -∞dB
Stereo Surround
14dB
(2dB step)
14dB
(2dB step)
0dB
½-20dB
(2dB step), -25dB, -30dB,
（With
the independent control）
-45dB,
-60dB,
MUTE
Specifications
●Electrical
characteristics
Unless specified: Ta=25C, VCC=9V, f=1kHz, VIN=1Vrms, Rg=600Ω, RL=10kΩ, Front Volume 0dB,
Rear Volume =0dB, Bass=0dB, Treble=0dB, AGC=OFF, SURROUND=OFF.
Limits
Parameter
Symbol
Min.
Current upon no signal
Maximum input voltage
Maximum output voltage
Voltage gain
Channel balance
Total harmonic distortion
Output noise voltage
IQ
V
IM1
V
OM1
G
V1
CB
THD1
V
NO1
－
2.6
2.2
-2
-1.5
－
－
Typ.
8
2.8
2.5
0
0
0.008
6
Max.
20
－
－
2
1.5
0.1
18
mA
Vrms
Vrms
dB
dB
％
Vrms
Vin=0Vrms
Front Volume = -6dB
THD(Vout)=1％
BPF=400-30KHz
THD=1％
BPF=400-30KHz
G
V
=20log(Vout/Vin)
CB = GV1-GV2
Vout=500mVrms
BPF=400-30KHz
BPF = IHF-A, Rg=0Ω
Front Volume = -87dB
Rear Volume = -∞dB
BPF = IHF-A, Rg=0Ω
CT = 20log(Vin/Vout)
BPF = IHF-A
Unit
Conditions
Residual noise voltage
Cross talk 1ch→2ch
V
MNO1
CT
12
－
1.5
80
10
－
Vrms
dB
70
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●Dimensional
outline drawing
BD3884FS
LOT No
.
SSOP-A24 (Unit : mm)
●Block
diagram
24
BNF1
23
BOUT1
22
BNF2
21
BOUT2
20
OUT1
19
OUT2
18
LINE1
17
LINE2
16
GND
15
SDA
14
SCL
13
CAP2
BASS
CH1
Bass
-14½14dB
2dB step
BASS
CH2
IIC BUS
Logic
0dB
0dB
SURROUND
(Fixed Effect Amount)
Treble
-14½14dB
2dB step
Rear Vol
0½-20dB 2dB step
-25, -30, -45, -60, -∞dB
With soft switch
AGC
(4 Level variable)
TREBLE
CH1
TREBLE
CH2
Front Vol
0½-87dB
1dB step
VCC/2
VCC
50k
89k
50k
11k
IN1
89k
11k
IN2
TNF1
TNF2
VIN2
SEL2
VIN1
SEL1
LS
CAP1
FIL
VCC
1
2
3
4
5
6
7
8
9
10
11
12
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●Cautions
on use
(1) Numbers and data in entries are representative design values and are not guaranteed values of the items.
(2) Although we are confident in recommending the sample application circuits, carefully check their
characteristics further when using them. When modifying externally attached component constants before
use, determine them so that they have sufficient margins by taking into account variations in externally
attached components and the Rohm LSI, not only for static characteristics but also including transient
characteristics.
(3) Absolute maximum ratings
If applied voltage, operating temperature range, or other absolute maximum ratings are exceeded, the LSI
may be damaged. Do not apply voltages or temperatures that exceed the absolute maximum ratings. If
you think of a case in which absolute maximum ratings are exceeded, enforce fuses or other physical safety
measures and investigate how not to apply the conditions under which absolute maximum ratings are
exceeded to the LSI.
(4) GND potential
Make the GND pin voltage such that it is the lowest voltage even when operating below it. Actually confirm
that the voltage of each pin does not become a lower voltage than the GND pin, including transient
phenomena.
(5) Thermal design
Perform thermal design in which there are adequate margins by taking into account the allowable power
dissipation in actual states of use.
(6) Shorts between pins and misinstallation
When mounting the LSI on a board, pay adequate attention to orientation and placement discrepancies of the
LSI. If it is misinstalled and the power is turned on, the LSI may be damaged. It also may be damaged if it
is shorted by a foreign substance coming between pins of the LSI or between a pin and a power supply or a
pin and a GND.
(7) Operation in strong magnetic fields
Adequately evaluate use in a strong magnetic field, since there is a possibility of malfunction.
REV. C
Notice
Notes
No copying or reproduction of this document, in part or in whole, is permitted without the
consent of ROHM Co.,Ltd.
The content specified herein is subject to change for improvement without notice.
The content specified herein is for the purpose of introducing ROHM's products (hereinafter
"Products"). If you wish to use any such Product, please be sure to refer to the specifications,
which can be obtained from ROHM upon request.
Examples of application circuits, circuit constants and any other information contained herein
illustrate the standard usage and operations of the Products. The peripheral conditions must
be taken into account when designing circuits for mass production.
Great care was taken in ensuring the accuracy of the information specified in this document.
However, should you incur any damage arising from any inaccuracy or misprint of such
information, ROHM shall bear no responsibility for such damage.
The technical information specified herein is intended only to show the typical functions of and
examples of application circuits for the Products. ROHM does not grant you, explicitly or
implicitly, any license to use or exercise intellectual property or other rights held by ROHM and
other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the
use of such technical information.
The Products specified in this document are intended to be used with general-use electronic
equipment or devices (such as audio visual equipment, office-automation equipment, commu-
nication devices, electronic appliances and amusement devices).
The Products specified in this document are not designed to be radiation tolerant.
While ROHM always makes efforts to enhance the quality and reliability of its Products, a
Product may fail or malfunction for a variety of reasons.
Please be sure to implement in your equipment using the Products safety measures to guard
against the possibility of physical injury, fire or any other damage caused in the event of the
failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM
shall bear no responsibility whatsoever for your use of any Product outside of the prescribed
scope or not in accordance with the instruction manual.
The Products are not designed or manufactured to be used with any equipment, device or
system which requires an extremely high level of reliability the failure or malfunction of which
may result in a direct threat to human life or create a risk of human injury (such as a medical
instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel-
controller or other safety device). ROHM shall bear no responsibility in any way for use of any
of the Products for the above special purposes. If a Product is intended to be used for any
such special purpose, please contact a ROHM sales representative before purchasing.
If you intend to export or ship overseas any Product or technology specified herein that may
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