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ROHM Semiconductor |
Audio ICs
BH3856S / BH3856FS
2-wire serial sound control IC
BH3856S / BH3856FS
The BH3856S and BH3856FS are signal processing ICs designed for volume and tone control in televisions, mini
component stereo systems, and other audio products. Their two-line serial control (I2C BUS) enables them to control
volume and tone on the basis of signals from a microcomputer, etc.
!Applications
Televisions, [Video equipped television], personal computer televisions, mini component stereo systems, car stereos.
!Features
1) I2C BUS facilitates direct serial control from a microcomputer of volume (main volume), balance (left / right), and tone
(bass, treble). DC control is also possible.
2) Volume is produced by a low-distortion, low-noise VCA. Designed to minimize step noise.
3) Stable standard voltage supply and built-in I/O buffer mean that few attachments are needed. SSOP-A32 package
designed to save space.
4) Matrix surround yields powerful sound.
!Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Power supply voltage
Power dissipation
Operating temperature
BH3856S
BH3856FS
Vcc
Pd
Topr
Storage temperature
Tstg
∗1 Reduced by 12mW for each increase in Ta of 1°C over 25°C.
∗2 Reduced by 6.8mW for each increase in Ta of 1°C over 25°C.
Limits
10.0
1200∗1
850 ∗2
−40~+85
−55~+150
Unit
V
mW
°C
°C
!Recommended operating conditions (Ta = 25°C)
Parameter
Power supply voltage
Symbol Min. Typ.
VCC 6.0 9
Max.
9.5
Unit
V
Note : I2C BUS is a registered trademark of Philips.
Audio ICs
!Block diagram
BH3856S / BH3856FS
BH3856S
A_GND 1
IN1 2
30k 30k
−−
VCC
30 FILTER
29 IN2
BVN1 3
BIN1 4
BVO1 5
5.1k
TVN1 6
TIN1 7
TVO1 8
2.1k
47k
−+
47k
+−
Volume
Volume
Matrix surround
28 BVN2
27 BIN2
5.1k
26 BVO2
25 TVN2
24 TIN2
2.1k
23 TVO2
OUT1 9
VCC 10
SC 11
N.C. 12
−
VCC
200k
Volume
SDA 13
− 22 OUT2
Volume
30k 21 VC1
30k
20 VC2
30k
19 TC
30k
18 BC
SCL 14
D_GND 15
Reference Voltage
17 Vref
16
SLAVE ADDRESS
SELECT SW
BH3856FS
A_GND 1
IN1 2
30k 30k
−−
VCC
32 FILTER
31 IN2
BVN1 3
BIN1 4
N.C. 5
5.1k
BVO1 6
TVN1 7
47k
−+
47k
+−
Volume
Volume
Matrix surround
30 BVN2
29 N.C.
28 BIN2
5.1k
27 BVO2
26 TVN2
TIN1 8
TVO1 9
2.1k
25 TIN2
2.1k
24 TVO2
OUT1 10
VCC 11
SC 12
SDA 13
−
VCC
200k
Volume
N.C. 14
23 OUT2
−
Volume
30k 22 VC1
30k
21 VC2
30k
20 TC
30k
19 BC
SCL 15
D_GND 16
Reference Voltage
18 Vref
17
SLAVE ADDRESS
SELECT SW
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