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BD3870FS-E2

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1/15
www.rohm.com
2010.10 - Rev.
A
© 2010 ROHM Co., Ltd. All rights reserved.
Sound Processors for BOOM BOX / Mini-component Stereo
Sound Processors
with Built-in 2-band Equalizers
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 BD3871FS BD3873FS BD3872FS
Input Gain 0, 6, 12, 18dB 24, 26, 28dB 18, 21, 24, 27dB
0, 5, 10, 19, 21,
23, 26, 28dB
Loud Speaker Equalizer (SEQ) No No No Yes
Input Selector Three inputs Three inputs Three inputs Five inputs
Volume
0 to -87dB/
1dB step, -dB
0 to -87dB/
1dB step, -dB
0 to –87dB/
1dB step, -dB
0 to -87dB/
1dB step, -dB
Equalizer
2 band
(Bass, Treble)
2 band
(Bass, Treble)
2 band
(Bass, Treble)
2 band
(Bass, Treble)
Surround Yes Yes Yes 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
Ratings
Unit
BD3870FS BD3871FS BD3873FS BD3872FS
Power Supply Voltage Vcc 10 10 10 10 V
Power Dissipation Pd 800 *
1
800 *
1
800 *
1
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 Symbol
Ratings
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℃.
No.10086EAT02
Technical Note
2/15
www.rohm.com
2010.10 - Rev.
A
© 2010 ROHM Co., Ltd. All rights reserved.
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)
Block
Parameter Symbol
Limits
Unit Condition
Min. Typ. Max.
Total
Circuit Current IQ - 8 21 mA At no signal
Total Output Voltage Gain Gv
-2 0 2
dB
BD3870FS, BD3872FS
Gv=20log(VOUT/VIN)
22 24 26
BD3871FS
Gv=20log(VOUT/VIN)
16 18 20
BD3873FS
Gv=20log(VOUT/VIN)
Total Harmonic Distortion ratio THD - 0.01 0.1 % BW=400 to 30kHz
Maximum Output Voltage Vom 1.6 2.1 - Vrms
THD=1%
BW=400 to 30kHz
Total Output Noise Voltage Vno
- 4.5 15
µVrms
BD3870FS, BD3872FS
Rg=0Ω, BW=IHF-A
- 40 80
BD3871FS, BD3873FS
Rg=0Ω, BW=IHF-A
Total Residual Noise Voltage Vmno - 4.5 15 µVrms
Rg=0Ω, BW=IHF-A
Volume=-dB
Cross-talk between Channels CTC - -80 -70 dB
Rg=0Ω, BW=IHF-A
VOUT=1Vrms
Cross-talk between Selectors CTS - -80 -70 dB Rg=0Ω, BW=IHF-A
Input Impedance Rin
35 50 65
kΩ
BD3870FS, BD3871FS, BD3873FS
70 100 130 BD3872FS
Output Impedance Rout - - 50 Ω
Volume
Volume Control Range VRI -90 -87 -84 dB VR=20log(VOUT/VIN)
Maximum Volume Attenuation Vmin - - -90 dB BW=IHF-A
Volume Input Impedance Rvin 39 56 73 kΩ
Bass
Bass Boost Gain GBB 12 14 16 dB GB=20log(VOUT/VIN)
Bass Cut Gain GBC -16 -14 -12 dB GB=20log(VOUT/VIN)
Bass Step Resolution BR - 2 - dB
Treble
Treble Boost Gain GTB
10 12 14
dB
BD3870FS, BD3871FS, BD3873FS
12 14 16 BD3872FS
Treble Cut Gain GTC
-14 -12 -10
dB
BD3870FS, BD3871FS, BD3873FS
-16 -14 -12 BD3872FS
Treble Step Resolution TR - 2 - dB
Surround
Surround In-phase Gain Vsur1 -2 0 2 dB 2ch in-phase inputs
Surround Single-phase Gain Vsur2 4.3 6.3 8.3 dB 1ch input, 1ch grounded
Surround Opposite-phase Gain Vsur3 8 10 12 dB 2ch opposite-phase inputs
SEQ
Loud Speaker Equalizer Gain
(BD3872FS only)
Seq 3 5 7 dB f=10kHz
* 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.
Technical Note
3/15
www.rohm.com
2010.10 - Rev.
A
© 2010 ROHM Co., Ltd. All rights reserved.
BD3870FS,BD3871FS,BD3872FS,BD3873FS
SC
(CLOCK)
thd thdth ts ts1 th1 tsd
twc
twh
twd
tw1
tsu
DATA DATA
LATCH
90% 90% 90% 90%
10% 10% 10%
90% 90% 90% 90% 90%
10%
10% 10%
twc
End with Low
SI
DATA
LATCH
●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
Fig.1
Parameter Symbol
Limits
Unit
Min. Typ. Max.
Minimum Clock Width Twc 2.0 - - µs
Minimum Data Width twd 2.0 - - µs
Minimum Latch Width Tw1 2.0 - - µs
Data Set-up Time (DATACLK) Tsd 1.0 - - µs
Data Hold Time (CLKDATA) Thd 1.0 - - µs
Latch Set-up Time (CLKLATCH) Ts1 1.0 - - µs
Latch Hold Time (DATALATCH) Th1 1.0 - - µs
Latch Low Set-up Time Ts 1.0 - - µs
Latch Low Hold Width Twh 2.0 - - µs
2) Voltage Conditions for Control Signals
Parameter
Limits
Unit Condition
Min. Typ.
Max.
(≦Vcc)
“H” Input Voltage 2.2 - 5.5 V Vcc=4.5 to 9.5V
“L” Input Voltage 0 - 1.0 V Vcc=4.5 to 9.5V
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BD3870FS-E2

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Description:
Audio Amplifiers 4.5V-9.5V 2-wire BASS, Treble
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