BD3870FS_10 Datasheet, PDF (1/16 Pages) Rohm – Sound Processors with Built-in 3-band Equalizers

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 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
Input Gain
Loud Speaker Equalizer (SEQ)
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
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
Symbol _BD3870FS
Ratings
BD3871FS BD3873FS
BD3872FS
Unit
Power Supply Voltage
Power Dissipation
Vcc
10
Pd
800 *¹
10
800 *¹
10
800 *¹
10
V
950 *²
mW
Operating Temperature Range
Topr
-25 to +75
-25 to +75
-25 to +75
-25 to +75
℃
Storage Temperature Range
Tstg
-55 to +125 -55 to +125 -55 to +125 -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
Prameter
Ratings
Symbol
Unit
BD3870FS BD3871FS BD3873FS BD3872FS
Operating Voltage Range
Vcc
4.5 to 9.5
4.5 to 9.5
4.5 to 9.5
4.5 to 9.5
V
*It must function normally at Ta=25℃.
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2010.10 - Rev.A