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Structure
:
Product
:
Type:
Package:
Silicon Monolithic Integrated Circuit
Sound Processor for car audio
BD37521FS
SSOP-A24
●
Feature
1. Reduce switching noise of input gain control, mute, main volume, fader volume, bass, treble, loudness by using
advanced switch circuit [Possible to control all steps]
2. Built-in ground isolation amplifier inputs, ideal for external stereo input.
3. Built-in input gain controller reduce switching noise for volume of a portable audio input.
4. Decrease the number of external components by built-in 2-band equalizer filter. And, possible to control Gv by
I
2
C BUS control.
5. It is possible for the bass, treble to the gain adjustment quantity of
±20dB
and 1 dB step gain adjustment.
6. Bi-CMOS process is suitable for the design of low current and low energy. And it provides more quality for small
scale regulator and heat in a set.
7. Package is SSOP-A24. Putting input-terminals together and output-terminals together can make PCB layout
easier and can makes area of PCB smaller.)
8. It is possible to control by 3.3V / 5V for I
2
C BUS.
●
Absolute Maximum Ratings
(Ta=25℃)
Parameter
Power supply Voltage
Input voltage
Power Dissipation
Storage Temperature
Symbol
VCC
VIN
Pd
Tastg
Limits
10.0
VCC+0.3½GND-0.3
1000
※1
-55½+150
Unit
V
V
mW
℃
※1
At Ta＝25°C or higher, this value is decreaced to 8mW/°C
When Rohm standard board is mounted.
3
Rohm standard board:
Size：70×70×1.6(mm )
material：FR4 glass-epoxy substrate (copper foil area: not more than 3%).
●
Operating Range
Parameter
Power supply Voltage
Temperature
Symbol
VCC
Topr
Min.
7.0
-40
Typ.
－
－
Max.
9.5
+85
Unit
V
℃
※Design
against radiation-proof isn’t made.
REV.
Ａ
2/4
●
Function
Function
Input selector
Input gain
Mute
Volume
Bass
Treble
Fader
Loudness
Specifications
Stereo 3 single-end input and 1differential input
0½20dB (1dB step), Possible to use “Advanced switch” for prevention of switching noise
Possible to use “Advanced switch” for prevention of switching noise.
+15dB½-79dB (1dB step),
-∞dB
Possible to use “Advanced switch” for prevention of switching noise.
-20½+20dB
(1dB step), Q=1, fo=100Hz
Possible to use advanced switch at changing gain
-20½+20dB
(1dB step), Q=1.25, fo=10kHz
Possible to use advanced switch at changing gain
0dB½-79dB (1dB step),
-∞dB
Possible to use “Advanced switch” for prevention of switching noise.
0dB½20dB (1dB step)
Possible to use “Advanced switch” for prevention of switching noise.
●Electrical
Characteristic
(Unless specified particularly, Ta=25℃, VCC=8.5V, f=1kHz, Vin=1Vrms, Rg=600Ω, R
L
=10kΩ, A input,
Input gain 0dB, Mute OFF, Volume 0dB, Tone control 0dB, Loudness 0dB, Fader 0dB)
Limit
Item
Symbol
Unit
Condition
Min.
Typ.
Max.
IQ
mA
No signal
－
38
48
Current upon no signal
GV
-1.5
0
1.5
dB
Gv=20log(VOUT/VIN)
Voltage gain
CB
-1.5
0
1.5
dB
CB = GV1-GV2
Channel balance
VOUT=1Vrms
Total harmonic distortion
THD+N
－
0.001
0.05
％
BW=400-30KHz
Rg = 0Ω
Output noise voltage
VNO
－
3.8
15
μVrms
BW = IHF-A
Fader=-∞dB
VNOR
μVrms
Rg=0Ω
－
1.8
10
Residual output noise voltage
BW=IHF-A
Rg=0Ω
CTC
-100
-90
dB
CTC=20log(VOUT/VIN)
－
Cross-talk between channels
BW=IHF-A
f=100Hz
RR
-70
-40
dB
VRR=100mVrms
－
Ripple rejection
RR=20log(VOUT/VCCIN)
DP1 and DN input
DP2 and DN input
CMRR
50
65
－
dB
Common mode rejection ratio
CMRR=20log(VIN/VOUT)
BW = IHF-A
VIM at THD+N(VOUT)=1%
2.1
2.3
－
Vrms
V
IM
Maximum input voltage
BW=400-30kHz
Volume = 15dB
dB
G
V MAX
13
15
17
VIN=100mVrms
Maximum gain
Gv=20log(VOUT/VIN)
Volume=-∞dB
dB
Gf=20log(VOUT/VIN)
G
V MIN
－
-100
-85
Maximum attenuation
BW=IHF-A
THD+N=1%
V
OM
2.0
2.2
－
Vrms
Maximum output voltage
BW=400-30kHz
REV.
Ａ
3/4
●
Dimensional outline drawing
BD37521FS
Lot No.
SSOP-A24 (Unit：mm)
●
Block Diagram
●Descriptions
of terminal
Terminal
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Terminal
Name
FIL
A1
A2
B1
B2
C1
C2
DP1
DN
DP2
LDA1
LDB1
LDB2
LDA2
MUTE
N.C.
OUTR2
OUTR1
OUTF2
OUTF1
VCC
SCL
SDA
GND
REV.
Ａ
4/4
●Cautions
on use
(1) 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.
(2) 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.
(3) Thermal design
Perform thermal design in which there are adequate margins by taking into account the allowable power
dissipation in actual states of use.
(4) 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.
(5) Operation in strong magnetic fields
Adequately evaluate use in a strong magnetic field, since there is a possibility of malfunction.
REV.
Ａ
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
be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to
obtain a license or permit under the Law.
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More detail product informations and catalogs are available, please contact us.
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