BH3868BFS
Audio ICs
Audio sound processor with
BH3868BFS
∗
R
BH3868BFS is a Audio sound processor IC developed for TV. This IC is built-in volume, balance, tone, surround, BBE
2
processor and AGC. This IC can be easily controlled by tow-wire serial control (I C BUS).
∗
BBE is a registered trade mark of BBE Sound Inc.
Note : I
2
C BUS is a registered trade mark of Philips.
!
Applications
Suitable for TV, TV-radio, PC-TV, mini-component and car audio system, etc.
!
Features
1) Volume (main volume), balance (right/left), tone (bass and treble), surround (mode and effect), BBE processor (effect)
2
can be controlled by I C-BUS.
2) Volume is VCA with low distortion rate and low noise and can restrain the step noise.
3) The reference voltage source is stable, only a few external devices are required because I/O buffer is contained, and
the package is suitable for space-saving design for SSOP-A32.
4) Sound spread can be controlled by the matrix surround and effect adjustment.
5) The built-in AGC circuit can absorb the volume difference between input sources.
6) The contained BBE processor, which reproduce an original sound, controls the effect.
!
Absolute maximum ratings
(Ta=25°C)
Parameter
Impressed voltage
Power dissipation
Operating temperature range
Storage temperature range
Symbol
V
CC
Pd
Topr
Tstg
Limits
10.0
850
∗
−40
to
+85
−55
to
+150
Unit
V
mW
°C
°C
∗
When mounted on a glass epoxy board 70mm
×
70mm
×
1.6mm.
Reduced by 6.8mW for each increase in Ta of 1°C over 25°C.
!
Recommended operating conditions
(Ta=25°C)
Parameter
Power supply voltage
Symbol
V
CC
Min.
7.0
Typ.
−
Max.
9.5
Unit
V
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BH3868BFS
Audio ICs
!
Block diagram
SCL
17
16
CHIP
SDA
18
V
CC
15
V
CC
BC
19
LOGIC
CONTROL
14
TC
VC1
20
13
VC2
VOL
TONE
TONE
TRE1
22
Vref
OUT1
21
VOL
12
OUT2
11
TRE2
BAS1
23
10
BAS2
BTREA1
25
LPF
AMP
BTREB1
24
R−S
L+S
9
BTREB2
8
BTREA2
BBASB1
26
PHASE
SHIFT
7
BBASB2
BBE
BBASA1
27
L−R
L+R
BBE
6
BBASA2
VOL
IN1
28
VOL
5
IN2
PS2
29
4
SOUT
AGC
PS1
30
3
LS2
AGCADJ
31
2
LS1
BIAS
FILTER
32
1
GND
2/27
BH3868BFS
Audio ICs
!
Pin descriptions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Pin name
GND
LS1
LS2
SOUT
IN2
BBASA2
BBASB2
BTREA2
BTREB2
BAS2
TRE2
OUT2
VC2
TC
V
CC
CHIP
SCL
SDA
BC
VC1
OUT1
TRE1
BAS1
BTREB1
BTREA1
BBASB1
BBASA1
IN1
PS1
PS2
AGCADJ
FILTER
Ground terminal
ALC detector terminal at suppression side
ALC detector terminal at amplification side
Surround signal output terminal
2ch sound signal input terminal
2chBBE contour frequency setting terminal
2chBBE contour frequency setting terminal
2chBBE process frequency setting terminal
2chBBE process frequency setting terminal
2ch bass fc setting terminal
2ch treble fc setting terminal
2ch sound signal output terminal
2ch volume control terminal
Treble control terminal
Power supply terminal
Chip select terminal
I
2
C clock input terminal
I
2
C data input terminal
Bass control terminal
1ch volume control terminal
1ch sound signal output terminal
1ch treble fc setting terminal
1ch bass fc setting terminal
1chBBE process frequency setting terminal
1chBBE process frequency setting terminal
1chBBE contour frequency setting terminal
1chBBE contour frequency setting terminal
1ch sound signal input terminal
1st phase shift setting terminal
2nd phase shift setting terminal
AGC suppression level setting terminal
Filter terminal
Function
3/27
BH3868BFS
Audio ICs
!
Input output circuits
The terminal voltage shall be on when the data 0V volume=minimum, tone=flat, BBE=OFF, surround=OFF and
AGC=OFF after the power supply Vcc=9.0(V) has been turned on, and any external devices shall comply with the
measurement circuit diagram.
Pin. No
Pin name
Terminal
voltage
V
CC
Equivalent circuit
Description
430
2
LS1
0V
2pin
Terminal to set a time
constant at a side for
suppressing a signal level
of AGC.
GND
V
CC
20k
3
LS2
0V
3pin
Terminal to set a time
constant at a side for
amplifying a signal level
of AGC.
GND
V
CC
4
SOUT
4.5V
4pin
Terminal for output of
surround and pseudo
stereo and to set a
frequency characteristic.
10k
GND
V
CC
5
28
IN2
IN1
4.5V
5pin
28pin
30k
Terminal for sound signal
input.
GND
4/27
BH3868BFS
Audio ICs
Pin. No
Pin name
Terminal
voltage
V
CC
Equivalent circuit
Description
6
27
BBASA2
BBASA1
4.5V
6pin
27pin
21.5k
Terminal to set a contour
frequency of BBE.
GND
V
CC
200
7
26
BBASB2
BBASB1
4.5V
7pin
26pin
Terminal to set a contour
frequency of BBE.
200
GND
V
CC
8
25
BTREA2
BTREA1
4.5V
8pin
25pin
21.5k
Terminal to set a process
frequency of BBE.
GND
V
CC
200
9
24
BTREB2
BTREB1
4.5V
9pin
24pin
Terminal to set a process
frequency of BBE.
200
GND
5/27
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