BD3870FS ROHM Co. Ltd., BD3870FS Datasheet

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BD3870FS

Manufacturer Part Number
BD3870FS
Description
Audio Sound Processor For Home Audio
Manufacturer
ROHM Co. Ltd.
Datasheet

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Sound Processor Series for BOOM BOX / Mini-component Stereo
Sound Processor Built-in
2-band Equalizer
BD3870FS, BD3871FS, BD3873FS, BD3872FS
●Description
●Features
●Applications
●Product lineup
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.
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
BOOM BOX, mini-audio systems, and micro-audio systems.
Input Gain
Loud Speaker Equalizer (SEQ)
Input Selector
Volume
Equalizer
Surround
Serial Control
Package
Parameter
TECHNICAL NOTE
0 to -87dB/1dB
Two-wire serial
0, 6, 12, 18dB
(Bass, Treble)
Three inputs
BD3870FS
SSOP-A24
step, -∞dB
2 band
Yes
No
0 to -87dB/1dB
Two-wire serial
(Bass, Treble)
24, 26, 28dB
Three inputs
BD3871FS
SSOP-A24
step, -∞dB
2 band
Yes
No
18, 21, 24, 27dB
0 to –87dB/1dB
Two-wire serial
(Bass, Treble)
Three inputs
BD3873FS
SSOP-A24
step, -∞dB
2 band
Yes
No
0, 5, 10, 19, 21,
0 to -87dB/1dB
Two-wire serial
(Bass, Treble)
23, 26, 28dB
BD3872FS
Five inputs
SSOP-A32
step, -∞dB
2 band
Yes
Yes
Ver.B Oct.2005

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BD3870FS Summary of contents

Page 1

... Sound Processor Series for BOOM BOX / Mini-component Stereo Sound Processor Built-in 2-band Equalizer BD3870FS, BD3871FS, BD3873FS, BD3872FS ●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. ● ...

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... It must function normally at Ta=25°C. ● ●Electrical characteristics (Ta=25°C, 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) ...

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... GTB -14 -12 -10 GTC -16 -14 - Vsur1 - Vsur2 4.3 6.3 8.3 Vsur3 Seq 3/16 Unit Condition dB GB=20log(VOUT/VIN) dB GB=20log(VOUT/VIN) dB BD3870FS, BD3871FS, dB BD3873FS BD3872FS BD3870FS, BD3871FS, dB BD3873FS BD3872FS dB dB 2ch in-phase inputs dB 1ch input, 1ch grounded dB 2ch opposite-phase inputs dB f=10kHz ...

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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 ...

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... Control Data Format List Basic Configuration of Control Data Format ← Data input direction MSB D9 Control Data Format (BD3870FS, BD3871FS, BD3873FS) ← Data input direction D9 (1) Input Selector (2) (3) (4) * Control Data Format (BD3872FS) ← Data input direction D9 (1) (2) (3) (4) * ・* indicates ...

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... BD3871FS, BD3873FS) 0.33μ 0.0022μ 0.0022μ Treble1 fc=8kHz 0dB ~ -87dB -∞ Vcc/2 Vcc ●Pin description (BD3870FS, BD3871FS, BD3873FS) Pin No. Pin Name 1 VIN1 1ch volume input pin 2 VIN2 2ch volume input pin ...

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Vcc Loud Loud speaker speaker equalizer2 0dB 0dB ~ ~ -87dB -87dB -∞ -∞ Vcc/2 Vcc 0.22μ 0.22μ 0.0022μ 0.0022μ 5.6K 0.1μ 0.1μ 0.1μ ...

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Loud Loud speaker Treble1 speaker equalizer2 fc=10kHz 0dB 0dB ~ ~ -87dB -87dB -∞ -∞ Vcc/2 Vcc/2 Vcc 0.1μ 0.22μ 0.22μ A1 Fig.4 Application to ...

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Pin No. Pin Name 1 VIN1 1ch volume input pin 2 SEL1 1ch input selector output pin 3 VIN2 2ch volume input pin 4 SEL2 2ch input selector output pin 5 A1 1ch input pin A 6 ...

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Bass filter Using external components, center frequencies and Q factors of the bass characteristics are flexible Fig.5 Standard values of R3, R4 (reference) (R1=5.6kΩ, R2=390kΩ, C1=C2=0.1µF) Bass Boost ...

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Treble filter Fig.7 Standard values of R1, R2 (reference) Treble Boost Cut Amount 0dB 2dB 4dB 6dB 8dB 10dB 12dB 14dB (BD3872FS only) * The actual boost cut amount may deviate from the standard ...

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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 ...

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... FREQUENCY (Hz) Fig.20 Treble Gain - Frequency (BD3872FS) 13/ 0.1 0.01 0.001 0.001 0.01 0 INPUT VOLTAGE (Vrms) Fig.15 Total Harmonic Distortion ratio - Input Voltage (BD3870FS) 15 +14dB -14~+14dB -10 2dB step -14dB -15 10 100 1000 10000 100000 FREQUENCY (Hz) Fig.18 Bass Gain - Frequency ...

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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 ...

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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 ...

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... The products described herein utilize silicon as the main material. The products described herein are not designed ray proof. Published by Application Engineering Group BD3870FS Package and forming specification BD3871FS BD3872FS BD3873FS <<Tape and Reel information> Embossed carrier tape Tape Quantity 2000pcs ...

Page 17

Appendix ● 本資料の一部または全部をロームの許可なく、 転載 ・ 複写することを堅くお断りします。 ● 本資料の記載内容は改良などのため予告なく変更することがあります。 ● 本資料に記載されている内容は製品のご紹介資料です。 ご使用にあたりましては、 別途仕様書を必ずご請求   のうえ、 ご確認ください。    ● 本資料に記載されております応用回路例やその定数などの情報につきましては、 本製品の標準的な動作や   使い方を説明するものです。 したがいまして、 量産設計をされる場合には、 外部諸条件を考慮していただき   ますようお願いいたします。 ● 本資料に記載されております製品の使用に関する応用回路例 ・ 情報 ・ 諸データは、 あくまで一例を示すも   のであり、 これらの使用に起因する工場所有権に関する諸問題につきましては、 ロームは一切その責任   を負いかねますのでご了承ください。 ● 本資料に記載されております製品の販売に関し、 その製品自体の使用 ・ 販売、 その他の処分以外にはローム   の所有または管理している工業所有権など知的財産権またはその他のあらゆる権利について明示的に   も黙視的にも、 その実施または利用を買主に許諾するものではありません。 ● 本資料に記載されております製品および技術のうち 「外国為替及び外国貿易法」 に該当する製品または技術 ...

Page 18

Appendix No technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of ROHM CO.,LTD. The contents described herein are subject to change without notice. The specifications for the product ...

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