BA3880AS Rohm, BA3880AS Datasheet - Page 6

• Manufacturer Part Number: BA3880AS
• Description: High-definition sound processor
• Manufacturer: Rohm

Audio ICs
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.
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
GAIN
Item
V
CTL
Threshold level
BASS BOOST
V
0V (GND)
0.57 × V
0.64 × V
CC
CC
CC
Recommended setting range for bypass mode
Recommended setting range for processor mode
LARGE
C1
Mode setting
0.75 × V
0.5 × V
SMALL
CC
CC
DEFINITION LEVEL
LARGE
FREQUENCY
C2
SMALL
BA3880AS / BA3880AFS
Max. (11dB Typ.)
Min. (1dB Typ.)
Definition level
C1: External capacitor
C2: External capacitor
connected between the
VCA and MIX pins
(6800pF in the
application circuit).
connected between the
OUT and MIX pins
(470pF in the application
circuit).