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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)