00W167A
Audio sound processor IC
BD3867AS
0.5 1Min.
1
11
6.5±0.3
Description
The BD3867AS is an audio sound processor IC for TVs
that can reduce step-noise by adopting a volume and
tone circuit with VCA system. An AGC circuit and matrix
surround circuit are also incorporated. This IC can process
all audio sound control in TV.
Dimension (Units : mm)
19.4±0.3
22
12
Features
1) Volume and tone can be controlled directly from a micro-
computer due to the adoption of I
2
C-BUS.
2) Low distortion volume and low noise VCA can reduce step-noise.
3) By use of an AGC circuit there is better blending of volume
differences between input sources and an improvement in
the audible S/N ratio.
4) Matrix surround circuit with phase shift technology.
5) Good channel balance at any volume attenuation.
6) Maximum volume attenuation value: -110dB (Typ.)
Applications
3.95±0.3
7.62
3.4±0.2
0.3±0. 1
1.778
0.5±0. 1
0˚~15˚
SDIP22
TV appliances such as DVD, PC, HDTV, Karaoke, digital broadcasting, and CATV
Absolute Maximum Ratings (Ta=25˚C)
Parameter
Applied voltage
Power dissipation
Operating temperature range
Storage temperature range
*Derating : 10mW/˚C for operation above Ta=25˚C
Symbol
Vcc
Pd
Topr
Tstg
–40
–55
Limits
10.0
1000
~
~
*
Unit
V
mW
+85
+125
˚C
˚C
August, 2000
Recommended Operating Conditions(Ta=25˚C)
Parameter
Supply voltage
Symbol
V
CC
Min.
7.0
Typ.
—
Max.
9.5
Unit
V
Electrical characteristics
(Unless otherwise noted,Ta=25˚C, Vcc=9V, f=1kHz, V
IN
=1Vrms, Rg=0Ω, R
L
=10kΩ, Volume 0dB,
Bass 0db, Treble 0dB, Mute OFF, AGC OFF, Surround OFF, Loop OFF, Effect 0step)
Parameter
Quiescent current
Voltage gain
Channel balance
Total harmonic distortion
Output noise voltage
Residual output noise voltage
Cross talk
Maximum output voltage
Maximum attenuation
Bass boost cut gain
Treble boost cut gain
Symbol
IQ
Gv
CB
THD
V
NO
V
MNO
CT
V
OM
ATT
MAX
V
B
V
T
V
AGC1
AGC I/O level
Surround gain
Surround gain
Mute attenuatio
V
AGC2
V
AGC3
V
AGC4
V
SMAX
V
SMIN
ATT
MU
Min.
—
–1.5
–1.5
—
—
—
65
2.1
—
±11
0.7
50
90
160
7
0
—
Typ.
24
0
0
0.01
100
3
75
2.5
–110
±14
1
80
130
210
9.5
2.5
–110
Max.
34
1.5
1.5
0.1
200
10
—
—
–80
±17
1.4
110
170
260
12
5
–80
Unit
mA
dB
dB
%
µVrms
µVrms
dB
Vrms
dB
dB
V
OUT
=1Vrms, BPF=400~30kHz
Volume 0dB, BPF=Din Audio
Volume–∞dB, BPF=Din Audio
BPF=Din Audio
THD=1%
Volume–∞dB, BPF=Din Audio
f=100Hz
f=10kHz
Conditions
V
IN
=0Vrms
mVrms AGC ON,
V
IN
=1mVrms
mVrms AGC ON,
V
IN
=50mVrms
mVrms AGC ON,
V
IN
=110mVrms
mVrms AGC ON,
V
IN
=1Vrms
dB
dB
dB
Surround ON, Effect 15 step
Surround ON, Effect 0 step
Mute ON, BPF=Din Audio
Application circuit
10µ 100k 10µ
0.068µ 1000p
+
10µ
0.1µ
4.7µ
4.7µ
4.7µ
4.7µ
+
22
LS1
21
IN1
20
FB1
19
FT1
18
17
16
VCC
+
15
SB
+
14
ST
+
13
SV2
+
12
SV1
OUT1 PS
AGC
VOL
TONE
VOL
I
2
C BUS Logic
Surround
20k
AGC
VOL
TONE
VOL
1
VCC
2
20k
BD3867AS
LS2
1
IN2
2
+
+
10µ
0.068µ 1000p
220k 4.7µ
10µ
47µ
Slave address
Select
I
2
C BUS
Interface
FB2
3
4
FT2
OUT2 VREF GND
5
+
6
+
7
AD1
8
AD2
9
SCL
10
SDA
11
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