BD3870FS-E2 [ROHM]
Tone Control Circuit, 2 Channel(s), BICMOS, PDSO24, ROHS COMPLIANT, SSOP-24;
| 型号： | BD3870FS-E2 |
| 厂家： | 
ROHM |
| 描述： | Tone Control Circuit, 2 Channel(s), BICMOS, PDSO24, ROHS COMPLIANT, SSOP-24 信息通信管理 光电二极管 商用集成电路 |
| 文件： | 总18页 (文件大小：544K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Sound Processors for BOOM BOX / Mini-component Stereo
Sound Processors
with Built-in 2-band Equalizers
No.10086EAT02
BD3870FS,BD3871FS,BD3872FS,BD3873FS
●Description
The Sound Processor with built-in 2 Band Equalizer, incorporates functions required for BOOM BOX and mini-component
systems, such as input selector, input gain amp, volume, surround, tone (bass, treble), and loud speaker equalizer
(BD3872FS only). These functions can be controlled through the two-wire serial control.
●Features
1) Using external components, center frequencies and Q factors of the bass characteristics are flexible.
2) Providing a mute switch onto one of the input pins allows cross-talk suppression.
3) A surround function can be constructed without external components.
4) Energy-saving design resulting in low current consumption, by utilizing the BiCMOS process
●Applications
BOOM BOX, mini-audio systems, and micro-audio systems.
●Line up matrix
Parameter
BD3870FS
0, 6, 12, 18dB
No
BD3871FS
24, 26, 28dB
No
BD3873FS
18, 21, 24, 27dB
No
BD3872FS
0, 5, 10, 19, 21,
23, 26, 28dB
Input Gain
Loud Speaker Equalizer (SEQ)
Input Selector
Volume
Yes
Three inputs
Three inputs
Three inputs
Five inputs
0 to -87dB/
1dB step, -dB
0 to -87dB/
1dB step, -dB
0 to –87dB/
1dB step, -dB
0 to -87dB/
1dB step, -dB
2 band
(Bass, Treble)
2 band
(Bass, Treble)
2 band
(Bass, Treble)
2 band
(Bass, Treble)
Equalizer
Surround
Yes
Yes
Yes
Yes
Serial Control
Package
Two-wire serial
SSOP-A24
Two-wire serial
SSOP-A24
Two-wire serial
SSOP-A24
Two-wire serial
SSOP-A32
●Absolute maximum ratings (Ta=25℃)
Ratings
Prameter
Symbol
Unit
BD3870FS
BD3871FS
10
BD3873FS
10
BD3872FS
10
950 *2
Power Supply Voltage
Vcc
Pd
10
800 *1
V
mW
℃
Power Dissipation
800 *1
800 *1
Operating Temperature Range
Storage Temperature Range
Topr
Tstg
-25 to +75
-55 to +125
-25 to +75
-55 to +125
-25 to +75
-55 to +125
-25 to +75
-55 to +125
℃
*1 Reduced by 8.0 mW/℃ at 25℃ or higher, when installed on the standard board (Size: 70×70×1.6mm).
*2 Reduced by 9.5 mW/℃ at 25℃ or higher, when installed on the standard board (Size: 70×70×1.6mm).
●Operating voltage range
Ratings
Prameter
Symbol
Vcc
Unit
V
BD3870FS
4.5 to 9.5
BD3871FS
4.5 to 9.5
BD3873FS
4.5 to 9.5
BD3872FS
4.5 to 9.5
Operating Voltage Range
*It must function normally at Ta=25℃.
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© 2010 ROHM Co., Ltd. All rights reserved.
2010.10 - Rev.A
1/15
Technical Note
BD3870FS,BD3871FS,BD3872FS,BD3873FS
●Electrical characteristics
(Ta=25 ℃ , VCC=8V, f=1kHz, Vi=200mVrms, RL=10kΩ, Rg=600Ω, Input Gain=0dB (BD3870FS, BD3872FS only),
Input Gain=24dB (BD3871FS only), Input Gain=18dB (BD3873FS only),Volume=0dB, Bass=0dB, Treble=0dB,
Surround=OFF, Loud Speaker Equalizer=OFF (BD3872FS only), unless otherwise noted)
Limits
Parameter
Circuit Current
Symbol
IQ
Unit
mA
Condition
Min.
-
Typ.
8
Max.
21
At no signal
BD3870FS, BD3872FS
Gv=20log(VOUT/VIN)
-2
0
2
BD3871FS
Gv=20log(VOUT/VIN)
Total Output Voltage Gain
Gv
22
24
26
dB
BD3873FS
Gv=20log(VOUT/VIN)
16
-
18
0.01
2.1
20
0.1
-
Total Harmonic Distortion ratio
Maximum Output Voltage
THD
Vom
%
BW=400 to 30kHz
THD=1%
BW=400 to 30kHz
1.6
Vrms
BD3870FS, BD3872FS
Rg=0Ω, BW=IHF-A
-
-
-
-
4.5
40
15
80
Total Output Noise Voltage
Total Residual Noise Voltage
Vno
µVrms
µVrms
BD3871FS, BD3873FS
Rg=0Ω, BW=IHF-A
Rg=0Ω, BW=IHF-A
Volume=-dB
Rg=0Ω, BW=IHF-A
Vmno
4.5
-80
15
Cross-talk between Channels
Cross-talk between Selectors
CTC
CTS
-70
dB
dB
VOUT=1Vrms
-
35
70
-
-80
50
100
-
-70
65
130
50
-84
-90
73
16
-12
-
Rg=0Ω, BW=IHF-A
BD3870FS, BD3871FS, BD3873FS
BD3872FS
Input Impedance
Rin
kΩ
Output Impedance
Rout
VRI
Ω
Volume Control Range
Maximum Volume Attenuation
Volume Input Impedance
Bass Boost Gain
-90
-
-87
-
dB
dB
kΩ
dB
dB
dB
VR=20log(VOUT/VIN)
BW=IHF-A
Vmin
Rvin
GBB
GBC
BR
39
12
-16
-
56
14
-14
2
GB=20log(VOUT/VIN)
GB=20log(VOUT/VIN)
Bass Cut Gain
Bass Step Resolution
10
12
-14
-16
-
12
14
-12
-14
2
14
16
-10
-12
-
BD3870FS, BD3871FS, BD3873FS
BD3872FS
Treble Boost Gain
Treble Cut Gain
GTB
GTC
dB
dB
BD3870FS, BD3871FS, BD3873FS
BD3872FS
Treble Step Resolution
TR
dB
dB
dB
dB
Surround In-phase Gain
Surround Single-phase Gain
Vsur1
Vsur2
-2
4.3
8
0
2
2ch in-phase inputs
6.3
10
8.3
12
1ch input, 1ch grounded
2ch opposite-phase inputs
Surround Opposite-phase Gain Vsur3
Loud Speaker Equalizer Gain
Seq
3
5
7
dB
f=10kHz
(BD3872FS only)
*
*
*
For measurement, VP-9690A (Average value wave detection, Effective value display) IHF-A filter by Matsushita Communication Industrial is used.
Phase relation between Input/Output signal terminals is the same.
Note: This IC is not designed to be radiation-resistant.
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2010.10 - Rev.A
2/15
© 2010 ROHM Co., Ltd. All rights reserved.
Technical Note
BD3870FS,BD3871FS,BD3872FS,BD3873FS
●Timing chart
1)Signal Timing Conditions
・Data is read on the rising edge of the clock.
・Latch is read out on the falling edge of the clock.
・Latch signal must end with the LOW state.
・To avoid malfunctions, clock and data signals must terminate with the LOW state.
1byte=10bit
90%
90%
90%
90%
10%
SC
(CLOCK)
tsu
twc
twc
10%
10%
thd
ts
th
tsd
thd
ts1
th1
SI
DATA
LATCH
90%
90%
90%
90%
90%
twh
tw1
twd
DATA
DATA
10%
LATCH
10%
10%
End with Low
Fig.1
Limits
Typ.
Parameter
Symbol
Unit
Min.
Max.
-
Minimum Clock Width
Minimum Data Width
Minimum Latch Width
Twc
twd
Tw1
Tsd
Thd
Ts1
Th1
Ts
2.0
2.0
2.0
1.0
1.0
1.0
1.0
1.0
2.0
-
-
-
-
-
-
-
-
-
µs
µs
µs
µs
µs
µs
µs
µs
µs
-
-
-
-
-
-
-
-
Data Set-up Time (DATACLK)
Data Hold Time (CLKDATA)
Latch Set-up Time (CLKLATCH)
Latch Hold Time (DATALATCH)
Latch Low Set-up Time
Latch Low Hold Width
Twh
2)Voltage Conditions for Control Signals
Parameter
Limits
Unit
Condition
Max.
(≦Vcc)
Min.
2.2
0
Typ.
“H” Input Voltage
“L” Input Voltage
-
-
5.5
V
V
Vcc=4.5 to 9.5V
Vcc=4.5 to 9.5V
1.0
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© 2010 ROHM Co., Ltd. All rights reserved.
2010.10 - Rev.A
3/15
Technical Note
BD3870FS,BD3871FS,BD3872FS,BD3873FS
3)Control Data Format List
Basic Configuration of Control Data Format
Data input direction
MSB
LSB
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Select
Address
Data
Control Data Format (BD3870FS, BD3871FS, BD3873FS)
Data input direction
D9
D8
D7
D6
D5
D4
*
D3
*
D2
*
D1
D0
0
(1)
(2)
(3)
(4)
Input Selector
Input Gain
Volume A
Bass Gain
Surround
0
0
1
1
Volume B
Treble Gain
*
1
0
1
*
*
*
*
*
*
*
*
Control Data Format (BD3872FS)
Data input direction
D9
D8
D7
D6
D5
D4
D3
*
D2
*
D1
0
D0
0
(1)
(2)
(3)
(4)
Input Gain
Input Selector
Volume A
Volume B
Treble Gain
Surround SEQ
*
0
1
1
1
0
1
Bass Gain
*
*
*
*
*
*
・”*” indicates 0 or 1.
・By changing the setting of Select Address, three or four different control formats (BD3871FS, BD3872FS,
BD3873FS, plus BD3872FS) are selectable.
・In every power-on sequence, all of the address data must be initialized.
Example:
←Input direction
MSB
Data(1)
LSB MSB
LSB MSB
Data(3)
LSB MSB
Data(4)
LSB
L
L
Data(2)
L
L
“L” indicates a latch.
・After power-on, for the second and subsequent times, only the necessary data can be selected for setting.
Example: When changing the volume,
←Input direction
MSB
Data(2)
LSB
L
“L” indicates a latch.
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© 2010 ROHM Co., Ltd. All rights reserved.
2010.10 - Rev.A
4/15
Technical Note
BD3870FS,BD3871FS,BD3872FS,BD3873FS
●Block diagram, application circuit, pin assignment (BD3870FS, BD3871FS, BD3873FS)
5.6k
5.6k
DATA
LATCH
OUT2
OUT1
CLOCK
VCC
0.1μ
0.1μ
0.1μ
0.1μ
0.0022μ
0.33μ
0.0022μ
10μ
10μ
390k
390k
24
23
22
21
20
19
18
17
16
15
14
13
Logic
Treble1
fc=8kHz
Treble２
fc=8kHz
Bass2
f0=80Hz
Bass1
f0=80Hz
Vcc/2
Vcc/2
0dB
～
-87dB
-∞
Vcc/2
Vcc/2
Vcc/2
50k
50k
50k
50k
50k
50k
1
2
3
4
5
6
7
8
9
10
11
12
47μ
10μ
10μ
10μ
10μ
10μ
10μ
4.7k
10μ
10μ
4.7k
A1
A2
B1
B2
C1
C2
Unit: Resistance =Ω, Capacitor = F
Fig.2
●Pin description (BD3870FS, BD3871FS, BD3873FS)
Pin No. Pin Name Description
Pin No. Pin Name
Description
1
2
VIN1
VIN2
SEL2
SEL1
A1
1ch volume input pin
13
14
15
16
17
18
19
20
21
22
23
24
SC
SI
Serial clock input pin
2ch volume input pin
2ch input selector output pin
1ch input selector output pin
1ch input pin A
Serial data input pin
Power supply pin
2ch output pin
3
VCC
OUT2
OUT1
4
5
1ch output pin
6
A2
2ch input pin A
BOUT1 1ch bass filter setting pin
BNF1 1ch bass filter setting pin
BOUT2 2ch bass filter setting pin
7
B1
1ch input pin B
8
B2
2ch input pin B
9
C1
1ch input pin C
BNF2
TNF2
TNF1
CAP
2ch bass filter setting pin
2ch treble filter setting pin
1ch treble filter setting pin
10
11
12
C2
2ch input pin C
FILTER 1/2 VCC pin
GND Ground pin
Time constant setting pin for absorbing
surround switching shock sound
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© 2010 ROHM Co., Ltd. All rights reserved.
2010.10 - Rev.A
5/15
Technical Note
BD3870FS,BD3871FS,BD3872FS,BD3873FS
●Block diagram, application circuit, pin assignment (BD3872FS)
DATA CLOCK
LATCH
Vcc
OUT1 OUT2
0.0022μ
0.0022μ
5.6K
5.6K
0.001μ
0.001μ
0.1μ
0.1μ
0.1μ
0.1μ
0.022μ 62K
4.7μ
4.7μ
0.33μ
+
+
Vcc/2
31
Vcc/2
390K
390K
28
27
26
25
24
23
22
21
20
19
18
17
32
30
29
Logic
Loud
speaker
Loud speaker
equalizer2
Bass1
f0=80Hz
Bass2
f0=80Hz
Treble1
fc=10kHz
Treble2
fc=10kHz
Vcc/2
Vcc/2
Vcc/2
0dB
～
0dB
～
-87dB
-∞
-87dB
-∞
Vcc/2
Vcc/2
100k
100k
100k
100k
100k
100k
100k
100k
100k
100k
1
2
3
4
5
6
8
9
7
10
11
12
13
14
15
16
+
0.1μ
0.1μ
0.1μ
0.1μ
0.1μ
0.1μ
0.1μ
0.1μ
0.1μ
0.1μ
0.22μ
0.22μ
10μ
4.7k
4.7k
A1
A2
B1
B2
C1
C2
D1
D2
E1
E2
Unit: Resistance =Ω, Capacitor = F
Fig.3 Application to Cinema Surround
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© 2010 ROHM Co., Ltd. All rights reserved.
2010.10 - Rev.A
6/15
Technical Note
BD3870FS,BD3871FS,BD3872FS,BD3873FS
DATA CLOCK
LATCH
OUT1 OUT2
Vcc
0.0022μ
0.1μ
5.6K
0.33μ
0.01μ
0.33μ
0.01μ 0.0022μ
5.6K
0.1μ
0.1μ
0.1μ
4.7μ
4.7μ
0.33μ
+
+
390K
25
390K
23
28
27
26
24
22
21
20
19
18
17
32
31
30
29
Loud speaker
equalizer1
Logic
Loud speaker
equalizer2
Bass1
f0=80Hz
Bass2
f0=80Hz
Treble1
fc=10kHz
Treble２
fc=10kHz
Vcc/2
Vcc/2
Vcc/2
0dB
～
0dB
～
-87dB
-∞
-87dB
-∞
Vcc/2
Vcc/2
100k
100k
100k
100k
100k
100k
100k
100k
100k
100k
1
2
3
4
5
6
8
9
7
10
11
12
13
14
15
16
+
0.1μ
0.1μ
0.1μ
0.1μ
0.1μ
0.1μ
0.1μ
0.1μ
0.1μ
0.1μ
0.22μ
0.22μ
10μ
4.7k
4.7k
A1
A2
B1
B2
C1
C2
D1
D2
E1
E2
Unit: Resistance =Ω, Capacitor = F
Fig.4 Application to Loud Speaker Equalizer
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© 2010 ROHM Co., Ltd. All rights reserved.
2010.10 - Rev.A
7/15
Technical Note
BD3870FS,BD3871FS,BD3872FS,BD3873FS
●Pin description (BD3872FS)
Pin No. Pin Name
Description
Pin No. Pin Name
Description
Serial clock input pin
1
2
VIN1
SEL1
VIN2
SEL2
A1
1ch volume input pin
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
SC
SI
1ch input selector output pin
2ch volume input pin
2ch input selector output pin
1ch input pin A
Serial data input pin
Power supply pin
3
VCC
CAP
OUT2
OUT1
Time constant setting pin for absorbing
switching shock sound
4
5
2ch output pin
1ch output pin
6
A2
2ch input pin A
7
B1
1ch input pin B
BOUT2 2ch bass filter setting pin
BNF2 2ch bass filter setting pin
BOUT1 1ch bass filter setting pin
8
B2
2ch input pin B
9
C1
1ch input pin C
10
11
12
13
14
15
16
C2
2ch input pin C
BNF1
TNF2
TNF1
1ch bass filter setting pin
2ch treble filter setting pin
1ch treble filter setting pin
D1
1ch input pin D
D2
2ch input pin D
E1
1ch input pin E
SOUT2 2ch cinema surround or SEQ setting pin
SQI2 2ch cinema surround or SEQ setting pin
SOUT1 1ch cinema surround or SEQ setting pin
SQI1 1ch cinema surround or SEQ setting pin
E2
2ch input pin E
FILTER 1/2 VCC pin
GND Ground pin
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© 2010 ROHM Co., Ltd. All rights reserved.
2010.10 - Rev.A
8/15
Technical Note
BD3870FS,BD3871FS,BD3872FS,BD3873FS
●Description of operations
1)Bass filter
Using external components, center frequencies and Q factors of the bass characteristics are flexible
1
f0
(Hz)
R1R2 R3 R4 C1C2
2π
R2 R3 R4
IN
+
-
R1R2R4C1C2
R3
R4
R2 R3 R4
Q
R1 C1 C2
R2
R2 R3 R4
C2
C1
C2
C1
C1
C2
1
1
R1 R2 R3 R4
R1
G(boost) 20log
(dB)
R2R3
R1 R2 R3 R4
Fig.5
R2R3
C2
1
R1
R2 R3 R4
R2(R3 R4
C1
C2
Gcut 20log
(dB)
ٛ
ٛ
ٛ
ٛ
1
R1
R2 R3 R4
C1
Standard values of R3, R4 (reference)
(R1=5.6kΩ, R2=390kΩ, C1=C2=0.1µF)
G
Resistance (kΩ) * Typ.
Bass Boost Cut Amount
R3
R4
0dB
2dB
77.64
58.90
44.02
32.20
22.82
15.36
9.44
0
G
G
18.73
33.60
45.42
54.80
62.26
68.18
72.84
4dB
6dB
f
F0
8dB
10dB
12dB
14dB
4.78
* The actual boost cut amount may deviate from the standard values in some degree.
Fig.6
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© 2010 ROHM Co., Ltd. All rights reserved.
2010.10 - Rev.A
9/15
Technical Note
BD3870FS,BD3871FS,BD3872FS,BD3873FS
2)Treble filter
IN
1
OUT
+
-
fc =
(Hz)
R1+R2+Zc
2πR2C
G (boost) = 20log
(dB)
R2+Zc
R2+Zc
R1+R2+Zc
R1
R2
C
G (cut) = 20log
(dB)
1
Zc =
(Ω)
jωc
Fig.7
Standard values of R1, R2 (reference)
G
Resistance (kΩ) * Typ.
3dB
Treble Boost Cut Amount
R1
R2
0dB
0
36.28
28.82
22.89
18.18
14.44
11.47
G
G
2dB
7.46
4dB
13.39
18.10
21.84
24.81
27.20
29.04
f
fc
6dB
8dB
10dB
3dB
12dB
9.08
7.24
14dB (BD3872FS only)
* The actual boost cut amount may deviate from the standard values in some degree.
Fig.8
3)Matrix surround
IN1
OUT1
+
+
L
+
(4.14L/2 - 2.14R/2)
× 1/2
× 1/2
×2.14
Fig.9
+
-
+
(4.14R/2- 2.14L/2)
OUT2
-
+
R
+
IN2
Matrix surround is constructed as shown above. Gains are defined as follows:
In-phase Gain: Gains obtained on OUT1 and OUT2 against IN1 when inputting a signal of the equivalent level and
in-phase (L=R) to IN1 and IN2.
OUT1
OUT2
4.14
2.14
20log1 0
(dB)
L
L
L 1
IN1
IN2
2
2
Single-phase Gain: Gains obtained on OUT1 and OUT2 against IN1 when inputting a signal to IN1 and AC-grounding IN2
(R=0).
OUT1 4.14
L
L
2,07
20log2.07 6.3
(dB)
(dB)
IN1
2
OUT2
2.14
20log 1.07 0.59
L
L
1.07
IN1
2
Opposite-phase Gain: Gains obtained on OUT1 and OUT2 against IN1 when inputting signals of the equivalent level and
opposite-phase (L-R) to IN1 and IN2.
OUT1 OUT2
4.14
2.14
20log3.14 10 (dB)
L
L
L 3.14
IN1
IN2
2
2
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2010.10 - Rev.A
10/15
© 2010 ROHM Co., Ltd. All rights reserved.
Technical Note
BD3870FS,BD3871FS,BD3872FS,BD3873FS
1)Sound generation using Loud Speaker Equalizer (BD3872FS)
Using external components, one of the following two functions can be established; one having an effect to localize the
vocal forward and enhance it (Loud Speaker Equalizer) and the other having an effect to clarify the vocal quality and
improve the Articulation Index (Cinema Surround). Those characteristic values can be adjusted by choosing the external
components with desirable constants. Details of above two functions are described below:
◎Cinema Surround
Constructing the external components as shown below allows the vocals to be moved forward and enhanced.
Surround effect with enhanced vocal is achieved by turning on the built-in surround simultaneously.
Merging this effect, while playing movies on a DVD player, will make vocal listening clearer and surround effect
more impactful.
31
30
29
32
Loud speaker
equalizer1
Loud speaker
equalizer2
Fig.10
◎Loud Speaker Equalizer (SEQ)
BOOM BOX and Micro-sound systems are often restricted to using small-diameter speakers because of location space.
These speakers, where the vocal range are attenuated, may give an impression of having a muffled vocal sound
with respect to its audibility. Using the Loud Speaker Equalizer, the vocal quality which degrades in small-diameter
speakers, can be improved and the Articulation Index is also increased.
OUT
IN
Phase Shifter
HPF
SOUT (29. 31pin)
SEQ (30, 32pin)
C2
C1
Fig.11
・C1 can be selected to determine the frequency where the phase should be inverted.
C1
Larger value
Smaller value
Frequency where the phase is inverted
Set to the lower frequency side
Set to the higher frequency side
・C2 can be selected to determine the HPF cut-off frequency fc. The SEQ gain remains constant.
1
fc =
(Hz)
2RC
(Where R is a built-in resistance of 10kΩ)
G=5dB
(Constant)
3dB
Fc
FREQUENCY
Fig.12
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
2010.10 - Rev.A
11/15
Technical Note
BD3870FS,BD3871FS,BD3872FS,BD3873FS
●Reference data
10
1
10
8
10
1
6
0.1
0.1
4
0.01
0.001
0.01
0.001
2
0
0.001
0.01
0.1
1
10
0.001
0.01
0.1
1
10
0
2
4
6
8
10
INPUT VOLTAGE (Vrms)
INPUT VOLTAGE (Vrms)
VCC (V)
Fig.13 Circuit Current - Power Supply
Voltage
Fig.14 Output Voltage - Input Voltage
(BD3870FS)
Fig.15 Total Harmonic Distortion
ratio - Input Voltage (BD3870FS)
20
30
15
+14dB
At 24dB setting
At 18dB setting
25
10
18
20
15
10
5
5
0
-14～+14dB
2dB step
16
14
12
10
-5
-10
-15
-14dB
0
10
100
1000
10000 100000
10
100
1000
10000 100000
10
100
1000
10000 100000
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
Fig.16 Current Gain - Frequency
(BD3870FS, BD3873FS)
Fig.17 Voltage Gain - Frequency
(BD3871FS)
Fig.18 Bass Gain - Frequency
20
15
15
+12dB
+14dB
10
10
15
-12～+12dB
2dB step
At oppoite-phase input
5
5
0
10
5
0
-5
-5
-10
-10
-12dB
-14dB
0
-15
-15
10
100
1000
10000 100000
10
100
1000
10000 100000
10
100
1000
10000 100000
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
Fig.19 Treble Gain - Frequency
(BD3870FS,BD3871FS,BD3873FS)
Fig.20 Treble Gain - Frequency
(BD3872FS)
Fig.21 Surround Gain - Frequency
10
8
6
4
2
0
10
100
1000
10000 100000
FREQUENCY (Hz)
Fig. 22 Treble Gain - Frequency
(BD3872FS)
www.rohm.com
2010.10 - Rev.A
12/15
© 2010 ROHM Co., Ltd. All rights reserved.
Technical Note
BD3870FS,BD3871FS,BD3872FS,BD3873FS
●Notes for use
1) Numbers and data in entries are representative design values and are not guaranteed values of the items.
2) Although ROHM is confident that the example application circuit reflects the best possible recommendations, be sure to
verify circuit characteristics for your particular application. Modification of constants for other externally connected circuits
may cause variations in both static and transient characteristics for external components as well as this Rohm IC. Allow for
sufficient margins when determining circuit constants.
3) Absolute maximum ratings
Use of the IC in excess of absolute maximum ratings, such as the applied voltage or operating temperature range (Topr),
may result in IC damage. Assumptions should not be made regarding the state of the IC (short mode or open mode) when
such damage is suffered. A physical safety measure, such as a fuse, should be implemented when using the IC at times
where the absolute maximum ratings may be exceeded.
4) GND potential
Ensure a minimum GND pin potential in all operating conditions. Make sure that no pins are at a voltage below the GND at
any time, regardless of whether it is a transient signal or not.
5) Thermal design
Perform thermal design, in which there are adequate margins, by taking into account the permissible dissipation (Pd) in
actual states of use.
6) Short circuit between terminals and erroneous mounting
Pay attention to the assembly direction of the ICs. Wrong mounting direction or shorts between terminals, GND, or other
components on the circuits, can damage the IC.
7) Operation in strong electromagnetic field
Using the ICs in a strong electromagnetic field can cause operation malfunction.
8) Power-ON RESET
A built-in circuit for performing initialization inside the IC at power-ON is provided. In unstable systems it is recommended
that the data shall be sent to all the addresses during power-ON, until this operation cycle is completed. Mute should be
applied during this cycle.
Function
Initial Condition
Input A
0dB
Input Selector
Input Gain
OFF
Loud Speaker Equalizer (BD3872FS only)
-dB
Volume
OFF
Surround
Treble Gain
Bass Gain
0dB
0dB
9) 2-wire serial control
For the CL and DA terminals, the patterned and other wirings should be routed as not to cause interference with the
analog-signal-related lines.
10) Switching between functions
Shock sound is absorbed when switching between the volume, bass, and treble functions.
11) Input coupling capacitor
As described in the figure below, low frequency characteristics are determined depending on the external capacitor value
for input coupling, and the input impedance value inside the IC.
G
C
0
A (f)
R
f
(2πfCR)2
=
A(f)
1+(2πfCR)2
Fig.23
Fig.24
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
2010.10 - Rev.A
13/15
Technical Note
BD3870FS,BD3871FS,BD3872FS,BD3873FS
12) Switching noise
For Surround and Loud Speaker Equalizer (BD3872FS only), external capacitor C is attached to the CAP pin as a measures
to control the switching noise. In the application circuit, a constant value as an example, is indicated by the CAP pin.
The time constant, which is used to charge/discharge the external capacitor C (varying between Vbe to 5Vbe (2.65V)) on
the CAP pin, controls the soft switching operation. The switching time constant T is stated as T=2.55×105×C.
Vbe has a temperature characteristic and may affect the time constant T.
13) Input Selector and Input Gain
When setting/changing Input Selector or Input Gain, the soft switching operation does not function and therefore noise is
not controlled. For this reason, it is recommended to provide a mute circuit constructed of the external components for the
set design.
MUTE setting example
MUTE
(L=ON, H=OFF)
SERIAL DATA
SERIAL DATA
500～600ms
40～60ms
INPUT SOURCE
Fig.25
●Thermal Derating Curve
1200
SSOP-A32
1000
SSOP-A24
800
600
400
200
0
0
25
50
75
100
125
Ambient Temperature: Ta(℃)
When installed ROHM standard board
(70×70×1.6mm Glass epoxy board)
Fig.26
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
2010.10 - Rev.A
14/15
Technical Note
BD3870FS,BD3871FS,BD3872FS,BD3873FS
●Ordering part number
B
D
3
8
7
0
F
S
-
E
2
Part No.
Part No.
3870,3871,3873
3872
Package
FS: SSOP-A24
SSOP-A32
Packaging and forming specification
E2: Embossed tape and reel
SSOP-A24
<Tape and Reel information>
+6°
10 0.2
(MAX 10.35 include BURR)
4°
−4°
Tape
Embossed carrier tape
2000pcs
24
13
Quantity
E2
Direction
of feed
The direction is the 1pin of product is at the upper left when you hold
reel on the left hand and you pull out the tape on the right hand
(
)
1
12
+0.1
−0.05
0.17
0.1
Direction of feed
1pin
0.38 0.1
0.8
Reel
Order quantity needs to be multiple of the minimum quantity.
(Unit : mm)
∗
SSOP-A32
<Tape and Reel information>
13.6 0.2
(MAX 13.95 include BURR)
Tape
Embossed carrier tape
Quantity
2000pcs
32
17
E2
Direction
of feed
The direction is the 1pin of product is at the upper left when you hold
reel on the left hand and you pull out the tape on the right hand
(
)
1
16
0.15 0.1
0.36 0.1
0.1
0.8
Direction of feed
1pin
Reel
(Unit : mm)
Order quantity needs to be multiple of the minimum quantity.
∗
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
2010.10 - Rev.A
15/15
Daattaasshheeeett
Notice
Precaution on using ROHM Products
1. Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment,
OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you
intend to use our Products in devices requiring extremely high reliability (such as medical equipment (Note 1), transport
equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car
accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or
serious damage to property (“Specific Applications”), please consult with the ROHM sales representative in advance.
Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any
damages, expenses or losses incurred by you or third parties arising from the use of any ROHM’s Products for Specific
Applications.
(Note1) Medical Equipment Classification of the Specific Applications
JAPAN
USA
EU
CHINA
CLASSⅢ
CLASSⅣ
CLASSⅡb
CLASSⅢ
CLASSⅢ
CLASSⅢ
2. ROHM designs and manufactures its Products subject to strict quality control system. However, semiconductor
products can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate
safety measures including but not limited to fail-safe design against the physical injury, damage to any property, which
a failure or malfunction of our Products may cause. The following are examples of safety measures:
[a] Installation of protection circuits or other protective devices to improve system safety
[b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure
3. Our Products are designed and manufactured for use under standard conditions and not under any special or
extraordinary environments or conditions, as exemplified below. Accordingly, ROHM shall not be in any way
responsible or liable for any damages, expenses or losses arising from the use of any ROHM’s Products under any
special or extraordinary environments or conditions. If you intend to use our Products under any special or
extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of
product performance, reliability, etc, prior to use, must be necessary:
[a] Use of our Products in any types of liquid, including water, oils, chemicals, and organic solvents
[b] Use of our Products outdoors or in places where the Products are exposed to direct sunlight or dust
[c] Use of our Products in places where the Products are exposed to sea wind or corrosive gases, including Cl2,
H2S, NH3, SO2, and NO2
[d] Use of our Products in places where the Products are exposed to static electricity or electromagnetic waves
[e] Use of our Products in proximity to heat-producing components, plastic cords, or other flammable items
[f] Sealing or coating our Products with resin or other coating materials
[g] Use of our Products without cleaning residue of flux (even if you use no-clean type fluxes, cleaning residue of
flux is recommended); or Washing our Products by using water or water-soluble cleaning agents for cleaning
residue after soldering
[h] Use of the Products in places subject to dew condensation
4. The Products are not subject to radiation-proof design.
5. Please verify and confirm characteristics of the final or mounted products in using the Products.
6. In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse. is applied,
confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power
exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect
product performance and reliability.
7. De-rate Power Dissipation (Pd) depending on Ambient temperature (Ta). When used in sealed area, confirm the actual
ambient temperature.
8. Confirm that operation temperature is within the specified range described in the product specification.
9. ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in
this document.
Precaution for Mounting / Circuit board design
1. When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product
performance and reliability.
2. In principle, the reflow soldering method must be used; if flow soldering method is preferred, please consult with the
ROHM representative in advance.
For details, please refer to ROHM Mounting specification
Notice - GE
Rev.002
© 2014 ROHM Co., Ltd. All rights reserved.
Daattaasshheeeett
Precautions Regarding Application Examples and External Circuits
1. If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the
characteristics of the Products and external components, including transient characteristics, as well as static
characteristics.
2. You agree that application notes, reference designs, and associated data and information contained in this document
are presented only as guidance for Products use. Therefore, in case you use such information, you are solely
responsible for it and you must exercise your own independent verification and judgment in the use of such information
contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses or losses
incurred by you or third parties arising from the use of such information.
Precaution for Electrostatic
This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper
caution in your manufacturing process and storage so that voltage exceeding the Products maximum rating will not be
applied to Products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron,
isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control).
Precaution for Storage / Transportation
1. Product performance and soldered connections may deteriorate if the Products are stored in the places where:
[a] the Products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2
[b] the temperature or humidity exceeds those recommended by ROHM
[c] the Products are exposed to direct sunshine or condensation
[d] the Products are exposed to high Electrostatic
2. Even under ROHM recommended storage condition, solderability of products out of recommended storage time period
may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is
exceeding the recommended storage time period.
3. Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads
may occur due to excessive stress applied when dropping of a carton.
4. Use Products within the specified time after opening a humidity barrier bag. Baking is required before using Products of
which storage time is exceeding the recommended storage time period.
Precaution for Product Label
QR code printed on ROHM Products label is for ROHM’s internal use only.
Precaution for Disposition
When disposing Products please dispose them properly using an authorized industry waste company.
Precaution for Foreign Exchange and Foreign Trade act
Since our Products might fall under controlled goods prescribed by the applicable foreign exchange and foreign trade act,
please consult with ROHM representative in case of export.
Precaution Regarding Intellectual Property Rights
1. All information and data including but not limited to application example contained in this document is for reference
only. ROHM does not warrant that foregoing information or data will not infringe any intellectual property rights or any
other rights of any third party regarding such information or data. ROHM shall not be in any way responsible or liable
for infringement of any intellectual property rights or other damages arising from use of such information or data.:
2. No license, expressly or implied, is granted hereby under any intellectual property rights or other rights of ROHM or any
third parties with respect to the information contained in this document.
Other Precaution
1. This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM.
2. The Products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written
consent of ROHM.
3. In no event shall you use in any way whatsoever the Products and the related technical information contained in the
Products or this document for any military purposes, including but not limited to, the development of mass-destruction
weapons.
4. The proper names of companies or products described in this document are trademarks or registered trademarks of
ROHM, its affiliated companies or third parties.
Notice - GE
Rev.002
© 2014 ROHM Co., Ltd. All rights reserved.
Daattaasshheeeett
General Precaution
1. Before you use our Pro ducts, you are requested to care fully read this document and fully understand its contents.
ROHM shall not be in an y way responsible or liable for failure, malfunction or accident arising from the use of a ny
ROHM’s Products against warning, caution or note contained in this document.
2. All information contained in this docume nt is current as of the issuing date and subj ect to change without any prior
notice. Before purchasing or using ROHM’s Products, please confirm the la test information with a ROHM sale s
representative.
3. The information contained in this doc ument is provi ded on an “as is” basis and ROHM does not warrant that all
information contained in this document is accurate an d/or error-free. ROHM shall not be in an y way responsible or
liable for any damages, expenses or losses incurred by you or third parties resulting from inaccuracy or errors of or
concerning such information.
Notice – WE
Rev.001
© 2014 ROHM Co., Ltd. All rights reserved.
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