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Número de pieza BD3871FS
Descripción Sound Processors
Fabricantes ROHM Semiconductor 
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No Preview Available ! BD3871FS Hoja de datos, Descripción, Manual

Sound Processors for BOOM BOX / Mini-component Stereo
Sound Processors
with Built-in 2-band Equalizers
BD3870FS,BD3871FS,BD3872FS,BD3873FS
No.10086EAT02
Description
The Sound Pr ocessor with built-in 2 Band Equalizer, incorporates functions required for BOOM BOX and mi ni-component
systems, such as input se lector, input gai n amp, vol ume, surroun d, tone (b ass, treble), an d lo ud speaker e qualizer
(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
Input Gain
Loud Speaker Equalizer (SEQ)
BD3870FS BD38
71FS BD38
73FS
0, 6, 12, 18dB
24, 26, 28dB
18, 21, 24, 27dB
No No No
BD3872FS
0, 5, 10, 19, 21,
23, 26, 28dB
Yes
Input Selector
Volume
Equalizer
Surround
Three inputs
0 to -87dB/
1dB step, -dB
2 band
(Bass, Treble)
Yes
Three inputs
0 to -87dB/
1dB step, -dB
2 band
(Bass, Treble)
Yes
Three inputs
0 to –87dB/
1dB step, -dB
2 band
(Bass, Treble)
Yes
Five inputs
0 to -87dB/
1dB step, -dB
2 band
(Bass, Treble)
Yes
Serial Control
Two-wire serial
Two-wire serial
Two-wire serial
Two-wire serial
Package SSOP-A24
SSOP-A24 SSOP-A24
SSOP-A32
Absolute maximum ratings (Ta=25)
Prameter S
ymbol
BD3870FS
Ratings
BD3871FS BD3873FS
Power Supply Voltage
Power Dissipation
Vcc 10
Pd 800 *1
10
800 *1
10
800 *1
Operating Temperature Range Topr
-25 to +75
-25 to +75
-25 to +75
Storage Temperature Range
Tstg -55 to +125 -55 to +125 -55 to +125
*1 Reduced by 8.0 mW/at 25or higher, when installed on the standard board (Size: 70×70×1.6mm).
*2 Reduced by 9.5 mW/at 25or higher, when installed on the standard board (Size: 70×70×1.6mm).
Operating voltage range
Prameter S
Operating Voltage Range
*It must function normally at Ta=25.
ymbol
Vcc
BD3870FS
4.5 to 9.5
Ratings
BD3871FS BD3873FS
4.5 to 9.5
4.5 to 9.5
BD3872FS
10
950 *2
-25 to +75
-55 to +125
BD3872FS
4.5 to 9.5
Unit
V
mW
Unit
V
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
1/15
2010.10 - Rev .A http://www.Datasheet4U.com

1 page




BD3871FS pdf
BD3870FS,BD3871FS,BD3872FS,BD3873FS
Technical Note
Block diagram, application circuit, pin assignment (BD3870FS, BD3871FS, BD3873FS)
0.1μ
0.33μ 0.0022μ 0.0022μ
5.6k
0.1μ 0.1μ
5.6k
0.1μ OUT1 OUT2
DATA
VCC LATCH CLOCK
10μ 10μ
24 23 22
390k
21 20
390k
19 18
17 16 15 14 13
Tre b le 1
fc=8k Hz
Treble
fc=8kHz
Bass2
f0=80Hz
Bass1
f0=80Hz
Log ic
Vcc/2
Vcc/2
0dB
-8 7dB
-
Vcc/2 V cc/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
10μ
A1 A2 B1 B2
4.7k 4.7k
10μ
C1 C2
Fig.2
Unit: Resistance =, Capacitor = F
Pin description (BD3870FS, BD3871FS, BD3873FS)
Pin No. Pin Name
Description
1 VIN1 1ch volume input pin
Pin No. Pin Name
Description
13 SC Serial clock input pin
2 VIN2 2ch volume input pin
14 SI Serial data input pin
3 SEL2 2ch input selector output pin
15 VCC Power supply pin
4 SEL1 1ch input selector output pin
16 OUT2 2ch output pin
5 A1 1ch input pin A
17 OUT1 1ch output pin
6 A2 2ch input pin A
18 BOUT1 1ch bass filter setting pin
7 B1 1ch input pin B
19 BNF1 1ch bass filter setting pin
8 B2 2ch input pin B
20 BOUT2 2ch bass filter setting pin
9 C1 1ch input pin C
21 BNF2 2ch bass filter setting pin
10 C2 2ch input pin C
22 TNF2 2ch treble filter setting pin
11 FILTER 1/2 VCC pin
12 GND
Ground pin
23 TNF1 1ch treble filter setting pin
24
CAP
Time constant setting pin for absorbing
surround switching shock sound
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
5/15
2010.10 - Rev .A

5 Page





BD3871FS arduino
BD3870FS,BD3871FS,BD3872FS,BD3873FS
Technical Note
1) Sound generation using Loud Speaker Equalizer (BD3872FS)
Using external components, one of the foll owing t wo func tions can be e stablished; one having an ef fect to localize the
vocal for ward and enhance it (Lou d Speaker Equa lizer) and t he oth er h aving an ef fect to clarif y the v ocal quality a nd
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 t he e xternal c omponents as sho wn b elow all ows the v ocals to be m oved for ward and enhanced.
Surround effect with enhanced vocal is achieved by turning on the built-in surround simultaneously.
Merging this ef fect, while pla ying movi es on a DVD pla yer, will make vocal liste ning clearer and s urround ef fect
more impactful.
32 31 30
29
Loud speaker Loud speaker
equalizer1
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 speaker s, where the v ocal ra nge are attenuate d, ma y give a n im pression of ha ving a muf fled vocal sou nd
with res pect to its audi bility. Using t he L oud Speaker E qualizer, the vo cal q uality which de grades i n small-d iameter
speakers, can be improved and the Articulation Index is also increased.
IN
Phase Shifter
HPF
OUT
SEQ (30, 32pin)
C1
SOUT (29. 31pin)
C2
Fig.11
C1 can be selected to determine the frequency where the phase should be inverted.
C1 Frequency where the phase is inverted
Larger value
Set to the lower frequency side
Smaller value
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 =
2 RC
( Hz)
(Where R is a built-in resistance of 10k)
3dB
G=5dB
(Constant)
Fc FREQUENCY
Fig.12
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
11/15
2010.10 - Rev .A

11 Page







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