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Электронный компонент: BH3866AS

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1
Video ICs
Dual-line serial control sound
processor IC
BH3866AS
The BH3866AS is a signal processing IC developed for the control of volume and tone quality in TV equipment.
Since dual-line serial control (I
2
C BUS) is used, the volume level and tone quality in TV equipment can be changed
using signals such as those from a microcomputer or similar device.
Applications
DVDs, personal computers, high-vision TVs, karaoke sets, digital broadcasts, CATVs, and other TV equipment
Features
1) 3-channel volume and sound quality control (for
stereo and center speakers).
2) Absorption of volume deviation between input
sources and improved S / N ratio, for better sound
quality, using an AGC circuit.
3) Control through I
2
C BUS serial control.
4) Internal pseudo-stereo circuit provides phase-shift
matrix surround effect.
Recommended operating conditions (Ta = 25C)
Absolute maximum ratings (Ta = 25C)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Power supply voltage
V
CC
7.0
--
9.5
V
Parameter
Symbol
Limits
Unit
Power supply voltage
V
CC
10.0
V
Power dissipation
1250
mW
Operating temperature
Topr
C
Storage temperature
Tstg
C
Pd
25 ~ + 75
55 ~ + 125
Reduced by 12.5mW for each increase in Ta of 1
C over 25
C.
2
Video ICs
BH3866AS
Pin descriptions
Pin No.
Pin name
Function
1
R
IN
Rch input
Pin No.
Pin name
Function
17
DAC
Expansion DAC (L / H)
2
GND
Ground
18
SCV
Vol Cch shock sound integration
3
AGCADJ
AGC 0dB adjustment
19
C
OUT
Cch output
4
LS1
AGC level sensor 1
20
L
OUT
Lch output
5
LS2
AGC level sensor 2
21
CB
Cch Bass fc setting
6
S
OUT
Sch output pin and LPF
22
CT
Cch Treble fc setting
7
PS
Phase shift pin (internal resistance: 18k
)
23
LB
Lch Bass fc setting
8
Vref
1 / 2 V
CC
24
LT
Lch Treble fc setting
9
STB
Bass shock sound integration
25
STT
Treble shock sound integration
10
RT
Rch Treble fc setting
26
BGAIN
Bass Mix Gain adjustment
11
RB
Rch Bass fc setting
27
MS
IN
Mono Sur input
12
R
OUT
Rch output
28
B
IN
Bass detection LPF operating amplifier input
13
SRV
Vol Rch shock sound integration
29
ADD
L + R added output after AGC
14
SLV
Vol Lch shock sound integration
30
C
IN
Cch input
15
SCL
I
2
C communications clock
31
V
CC
Power supply, 9V
16
SDA
I
2
C communications data
32
L
IN
Lch input
Block diagram
32
1
17
16
L
IN
R
IN
31
V
CC
GND
30
C
IN
AGCADJ
29
ADD
LS1
28
B
IN
LS2
27
MS
IN
S
OUT
26
BGAIN
PS
25
STT
Vref
24
LT
STB
23
LB
RT
22
CT
RB
21
CB
R
OUT
20
L
OUT
SRV
19
C
OUT
SLV
18
2
3
4
5
6
7
8
9
10
11
12
13
14
15
SCV
SCL
DAC
SDA
+
+
+
+
+
+
+
+
+
+
VCA
C
IN
AGC
MIX OFF
MIX ON
BASS
OFF
Surr effect
ON
OFF
ON
OFF
ON
OFF
ON
SON
OFF
ON
SSTE
LOOP
L + R
CSEL
SMON
A
G
C
L + R
PHASE
SHIFT
L + S
10k
10k
10k
10k
50k
50k
10k
50k
50k
50k
50k
50k
10k
10k
10k
VCA
R - S
L - R
LFP
AMP
+
V
CC
V
CC
1
2 V
CC
I
2
C BUS
SCL
SDA
interface
Increment
Increment
Volume
Volume
Volume
Volume
Volume
Volume
Tone
(bass / treble)
Tone
(bass / treble)
Tone
(bass / treble)
3
Video ICs
BH3866AS
Input / output circuits
Pin No.
Input pins.
30
4.5V
50k
--
--
I
C
IN
32
L
IN
1
R
IN
Pin name
I / O
Zin
Pin voltage
Equivalent circuit
Function
AGC 0dB adjustment pin.
This pin is connected to the
base of PNP.
The current output from this
pin is 1
A (Typ.) Max.
3
--
I
AGCADJ
Output pins.
19
4.5V
O
C
OUT
20
L
OUT
12
R
OUT
Time constant pin on the
side that suppresses the
AGC signal level.
4
--
--
--
LS1
V
CC
GND
50k
1
2 V
CC
V
CC
GND
200
200
10k
V
CC
GND
V
CC
GND
200
430
2k
4
Video ICs
BH3866AS
Pin No.
5
--
--
--
LS2
Pin name
I / O
Zin
Pin voltage
Equivalent circuit
Function
7
PS
Serves as both the output pin
for the surround and pseudo-
stereo effects, and the LPF
pin.
For the phase-shifter filter for
the surround and pseudo-
stereo effects.
6
4.5V
10k
O
S
OUT
1 / 2 V
CC
.
This voltage serves as the
power supply for the signal
system.
Time constant pin on the side
that amplifies the AGC signal
level.
8
4.5V
--
--
Vref
--
--
--
V
CC
GND
200
20k
2k
V
CC
GND
200
200
10k
V
CC
GND
10k
18k
10k
18k
50k
50k
V
CC
GND
5
Video ICs
BH3866AS
Pin No. Pin name
I / O
Zin
Pin voltage
Equivalent circuit
Function
Treble filter pins for the left,
right, and center channels.
Integration pins that prevent
shock sound when switching
the bass and treble levels.
25
--
--
--
--
30k
STT
9
STB
22
4.5V
30k
CT
24
LT
10
RT
Bass filter pins for the left,
right, and center channels.
21
4.5V
30k
CB
23
LB
11
RB
Integration pins that prevent
shock sound when switching
the volume levels on the left,
right, and center channels.
14
--
--
30k
SLV
18
SCV
13
SRV
V
CC
GND
30k
DAC
V
CC
GND
30k
1
2 V
CC
V
CC
GND
30k
1
2 V
CC
V
CC
GND
30k
DAC