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PDF BA3870 Data sheet ( Hoja de datos )

Número de pieza BA3870
Descripción BBS (bass boost system) for radio cassette players
Fabricantes ROHM Semiconductor 
Logotipo ROHM Semiconductor Logotipo



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No Preview Available ! BA3870 Hoja de datos, Descripción, Manual

Audio ICs
BBS (bass boost system) for radio
cassette players
BA3870
The BA3870 is a bass boost audio IC for radio cassette players. BBS adjusts the base boost to a level appropriate for
the volume, achieving a rich sound without distortion. Frequency characteristics can be set externally, enabling system
design to meet the needs of the application.
FApplications
Radio cassette players
FFeatures
1) Adjustment of the base boost to a level appropriate
for the volume through BBS.
2) Maximum bass boost level can be set externally.
(20dB recommended)
3) Treble boost circuit (constant at 4dB) included on-
chip to preserve overall balance.
4) BBS on / off “pop” sound almost nonexistent.
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
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BA3870 pdf
Audio ICs
FMeasurement circuit
BA3870
424

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BA3870 arduino
Audio ICs
2) BBS off
When BBS is off, the signal system is as shown in
Fig. 10 due to the switches in the IC, and signal flow
is as follows.
The frequency characteristics of each block are shown
in Fig. 11, and the gains are given by the following equa-
tions:
Attenuation of ATT3: GATT3 = 20log R20
R19)R20
(dB)
Gain of Amp D’: GD’ = 20log
R21)R22
R21
(dB)
As R19 = R20 and R21 = R22, the total gain GOFF when BBS
is off is
GOFF = GATT3)GD
GOFF = 0 (dB)
and the characteristics are flat as shown in Fig. 12
BA3870
430

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