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Número de pieza | BH3856 | |
Descripción | 2-wire serial sound control IC | |
Fabricantes | ROHM Semiconductor | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de BH3856 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
No Preview Available ! 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.
1 page Audio ICs
BH3856S / BH3856FS
Symbol Pin voltage
Equivalent Circuit
VCC
Description
TVO1
TVO2
OUT1
OUT2
SC
BC
TC
VC1
VC2
Vref
SDA
SCL
SASS
VCC
A_GND
D_GND
4.5V
4.5V
A_GND
VCC
25kΩ
9pin
24pin
Pin for high band filter connection.
4.5V
4.5V
−
3.8V
−
−
−
−
10pin Main volume output pin.
24pin OUT1 is the volume output for Channel 1.
OUT2 is the volume output for Channel 2.
A_GND
VCC
Digital
VREF
12pin
19pin
20pin
22pin
21pin
A_GND
VCC
18pin
A_GND
VCC
13pin
15pin
17pin
2kΩ
A_GND
Power supply voltage pin.
Analog GND pin. Connected to IC board.
Digital GND pin. Separate from Analog GND pin.
For prevention of shock noise during
step switching.
SC : Surround pin
BC : Bass pin
TC : Treble pin
VC1 : Volume pin (Channel 1)
VC2 : Volume pin (Channel 2)
3.8V regulator output pin.
Output requires capacitor for stopping
oscillation. Output pin has built-in precharge
and discharge circuits, so there is no problem
with start-up or shut-down even with a large
capacitor. This pin is for connection to the
high-band filter.
· I2C bass input pin
SDA : serial data line
SCL : serial clock line
· Slave address selection pin
SASS: slave address selection switch
∗The pin numbers are for the BH3856S.
5 Page Audio ICs
BH3856S / BH3856FS
(8) Volume attenuation (reference values)
ATT DATA
(dB) (HEX)
0 FF
−1 E4
−2 D8
−3 CF
−4 C8
−5 C2
−6 BD
−7 B8
−8 B2
−9 AD
−10 A9
−11 A5
−12 A0
−13 9C
−14 98
−15 94
−16 90
−17 8C
−18 89
ATT DATA
(dB) (HEX)
−19 85
−20 82
−22 7C
−24 78
−26 74
−28 70
−30 6D
−32 6A
−34 68
−36 65
−38 61
−40 5C
−42 59
−44 55
−46 52
−48 4E
−50 4B
−52 48
−54 45
ATT
(dB)
−56
−58
−60
−62
−64
−66
−68
−70
−72
−74
−76
−78
−80
−82
−84
−86
−90
−100
−112
Note : All figures in this table are reference values. When using this IC, check this table carefully and perform the appropriate setting.
DATA
(HEX)
42
3F
3C
39
36
34
32
2F
2D
2A
28
26
24
22
20
1E
1A
13
00
(9) Bass / Treble gain settings (reference values)
ATT
(dB)
15
DATA
(HEX)
3F
ATT DATA
(dB) (HEX)
0 1F
14 38
−1 1C
13 35
−2 1B
12 33
−3 19
11 31
−4 18
10 2F
−5 17
9 2E
−6 16
8 2D
−7 15
7 2C
−8 13
6 2B
−9 12
5 2A
−10 11
4 29
−11 0F
3 27
−12 0D
2 26
−13 0B
1 25
−14 08
0 1F
−15 05
Notes : (1) The gain values in the treble and bass data setting tables above are based on the assumption that the filter constants have
been set so that maximum and minimum gain are equal to the peak and bottom values listed in the frequency characteristics
drawings.
(2) All figures in this table are reference values. When using this IC, check this table carefully and perform the appropriate setting.
11 Page |
Páginas | Total 16 Páginas | |
PDF Descargar | [ Datasheet BH3856.PDF ] |
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