BA3880AS Просмотр технического описания (PDF) - ROHM Semiconductor

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Компоненты Описание

производитель

BA3880AS

High-definition sound processor

ROHM Semiconductor 

Audio ICs

BA3880AS / BA3880AFS

Bass boost

To maintain good balance with the dynamically changing treble component, the bass component is boosted. The bass

boost is fixed at 4dB (typ.) internally, and cannot be adjusted.

Mode switch

The DC voltage on the CTL pin can be used to switch the IC between processing mode and bypass mode. When

processing mode is selected, the audio signal is enhanced using the compensation circuits described above before being

output. When bypass mode is selected, the signal bypasses all of the compensation circuits, and only passes through a

buffer amplifier before output.

External components

The frequency characteristic in processing mode with maximum definition level is given below.

GAIN

BASS BOOST

C1

LARGE

C2

SMALL LARGE

SMALL

DEFINITION LEVEL

C1: External capacitor

connected between the

VCA and MIX pins

(6800pF in the

application circuit).

C2: External capacitor

connected between the

OUT and MIX pins

(470pF in the application

circuit).

FREQUENCY

As indicated in the diagram, capacitors C1 and C2 determine the treble component cutoff frequency. By varying the

values of these components, the frequency characteristic can be changed as indicated by the dotted line in the diagram.

This varies the balance of the harmonic component, and is an important factor in determining the tone quality.

Control table

Item

Threshold level

VCC

VCTL

0.64 × VCC

0.57 × VCC

0V (GND)

Mode setting

Recommended setting range for bypass mode

0.75 × VCC

Definition level

Min. (1dB Typ.)

0.5 × VCC

Recommended setting range for processor mode

Max. (11dB Typ.)

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