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BA3870 Datasheet Bass-Boost-System

Manufacturer: ROHM

General Description

s BA3870 422 Audio ICs FInput / output circuits BA3870 FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 5.0V and f = 1kHz) 423 Audio ICs FMeasurement circuit BA3870 424 Audio ICs FCircuit Operation (1) Overview of BBS BBS is a system which boosts the low end of the audible frequency range and at the same time linearly controls the amount of boost according to the volume to produce a rich sound without distortion through small diameter speakers.

It also adjusts the gain of the high-frequency range to attain a balanced sound with natural volume.

(2) Operation of BBS (1) BBS on The signal system when BBS is on is shown in Fig.

Overview

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.

Key Features

  • 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 onchip to preserve overall balance. 4) BBS on / off “pop” sound almost nonexistent. FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 420 Audio ICs FBlock diagram BA3870 421 Audio ICs FPin.