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PDF BA3880AFS Data sheet ( Hoja de datos )

Número de pieza BA3880AFS
Descripción High-definition sound processor
Fabricantes ROHM Semiconductor 
Logotipo ROHM Semiconductor Logotipo



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No Preview Available ! BA3880AFS Hoja de datos, Descripción, Manual

Audio ICs
BA3880AS / BA3880AFS
High-definition sound processor
BA3880AS / BA3880AFS
The BA3880AS and BA3880AFS are sound processor ICs that perform phase and harmonic compensation on audio
signals to accurately reproduce the "rise" section of audio signals that determines the characteristics of the sound, and
thus reproduce the original recording as naturally as possible.
!Applications
Component stereo systems, radio cassette players, car stereo systems, televisions, VCRs, and active speakers.
!Features
1) Correct distortion in the rising section of audio signals that results from miss-matched speakers and amplifiers, and
reproduces the original sound faithfully.
2) To allow application with all types of speakers and sources, the clarity can be adjusted using DC control.
3) DC control provided for selection of either processor mode or bypass mode.
4) Bass boost fixed internally to 4dB.
!Block diagram
BA3880AS
MIXL 1
VCAL 2
VCC 3
DEFL 4
DETL 5
GND 6
DETR 7
DEFR 8
CTL 9
VCAR 10
MIXR 11
+
+++
HI + MID
+++
LO
VCA
HPF
CTL LPF
CTL LPF
VCA
+++
HI
+
+
+
M+ID
+
LO
HPF
22 OUTL
21 INL
20 APFL
19 HPFL
18 LPFL
17 BIASC
16 LPFR
15 HPFR
14 APFR
13 INR
12 OUTR
BA3880AFS
GND 1
DETR 2
DEFR 3
CTL 4
CTL
VCA
VCAR 5
MIXR 6
OUTR 7
INR 8
APFR 9
HPFR 10
LPFR 11
HPF
LPF
BIASC 12
24 DETL
CTL
23
+ − LO
++
HI MID
++
+
+
+
VCA
22 DEFR
21 VCC
20 VCAL
19 MIXL
18 OUTL
+
+
+
++
HI MID
+
+ L+O
17 INL
16
15 APFL
HPF
LPF
14 HPFL
13 LPFL

1 page




BA3880AFS pdf
Audio ICs
BA3880AS / BA3880AFS
!Circuit operation
The BA3880AS and BA3880AFS high-definition sound processor system ICs treat the amplifiers and speakers as a total
audio systems, and perform signal processing at the amplifier input stage to accurately reproduce the rise sections of
audio signals that determine the characteristics of sound, and ensure that the replayed audio is as close to the original
sound and as natural sounding as possible.
Problems relating to playback of sound on audio systems.
With naturally-generated sound, high-frequency harmonic components generally occur first, followed by the fundamental
frequency components. This also applies to the attack section of the sound that characterizes many musical instruments.
It is the amplitude component that gives form to the frequency component and envelope at the rising point of sound, and
this expresses the characteristics of the sound. Therefore, when replaying audio on audio playback systems, it is
extremely important that the rise section of the signal be expressed accurately with respect to the original sound.
However, there is inevitable mismatching between the speakers and amplifiers in current audio systems. Solid-state
power amplifiers use negative feedback techniques and operate off a fixed voltage supply, but as speakers are a current
element, mismatching in the system inevitably occurs. In addition, the speaker impedance characteristics are strongly
influenced by the electrical reactance of the voice coil, and the mechanical reactance of the cone assembly. As a result of
this, distortion is generated in the rising sections of audio signals, causing phase shift in the reproduced sound. In addition,
impedance increases in the treble region which reduces the speaker amplitude and reduces the harmonic component,
and as a result there is a tendency to masking of large mid-frequency signal components that follow, and this makes it
difficult to reproduce the rising sections of the sound.
!Operating principle
To solve the problems described above, the BA3880AS and BA3880AFS perform the audio signal processing described
below.
Phase shift compensation
BASS
MIDDLE
TREBLE
20 150 2.4k 20k f (Hz)
The input signal is separated into three regions: bass (20Hz to 150Hz), middle (150Hz to 2.4kHz) and treble (2.4kHz to
20kHz). These regions are then joined again with the middle and treble regions phase shifted 180° and 360°
respectively with respect to the bass signal. This phase shift adjusts the delay time characteristic for each band and
minimizes the distortion of the rising section of the audio signal.
Amplitude compensation (harmonic compensation)
To maintain appropriate auditory balance for the treble region that is made up of harmonic components, a high-speed
detector and high-performance VCA circuit are used for amplitude control of the treble component. The amount of
compensation is determined from a calculation performed based on the DC level input to the CTL pin, and the DC level
detected from the input signal. The internal control signal obtained from this calculation compensates the amplitude of the
treble component input to the VCA. This amplitude compensation recovers the harmonic component, and improves the
reproduction clarity (definition level) of instruments and vocals.

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