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 (I
2
C 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
!!!!
2
1) I
C 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
!!!!
ParameterSymbolLimitsUnit
Power supply voltage10.0V
Power dissipation
Operating temperature
Storage temperature
1 Reduced by 12mW for each increase in Ta of
∗
2 Reduced by 6.8mW for each increase in
∗
(Ta = 25°C)
BH3856S
BH3856FS
Ta of 1°C over 25°C.
Vcc
Pd
Topr
Tstg
1°C over 25°C.
1200
850
−40~+85
−55~+150
1
∗
2
∗
mW
°C
°C
Recommended operating conditions
!!!!
ParameterSymbolMin.Typ.Max.Unit
Power supply voltage6.099.5VV
Note : I2C BUS is a registered trademark of Philips.
Channel 1 treble filter
Channel 1 volume output
Power supply
Time constant pin for prevention of switching shock
SDA data input pin
SCL data input pin
Digital ground
Slave address selection pin
Reference voltage output
Time constant pin for prevention of switching shock
Time constant pin for prevention of switching shock
Time constant pin for prevention of switching shock
Time constant pin for prevention of switching shock
Channel 2 volume output
Channel 2 treble filter
Channel 2 treble filter
Channel 2 treble filter
Channel 2 bass filter
Channel 2 bass filter
Channel 2 bass filter
Channel 2 volulme input
Filter
Not connected internally.
Page 4
Audio ICs
Input / output circuits
!!!!
Symbol
Pin voltage
Equivalent circuit
V
CC
BH3856S / BH3856FS
Description
IN1
IN2
BVN1
BVN2
BIN1
BIN2
BVO1
BVO1
4.5V
4.5V
4.5V
4.5V
4.5V
4.5V
4.5V
4.5V
FILTER5.2V
2pin
31pin
A_GND
V
A_GND
V
4pin
28pin
A_GND
V
6pin
27pin
A_GND
V
A_GND
CC
V
Main volume input pin.
47kΩ
2/1V
CC
CC
50kΩ
3pin
30pin
CC
5.1kΩ
2/1V
CC
CC
50kΩ
CC
30kΩ
Designed for input impedance of 47kΩTyp.).
Pin for low band filter connection.
Pin for low band filter connection.
Pin for low band filter connection.
Filter input pin.
Please install a capacitor of about 10µF to
the filter pin.
32pin
30kΩ
Has built-in precharge and discharge circuits.
TVN1
TVN2
TIN1
TIN2
4.5V
4.5V
4.5V
4.5V
A_GND
CC
V
8pin
25pin
A_GND
25kΩ
7pin
26pin
2.1kΩ
CC
2/1V
Pin for high band filter connection.
Pin for high band filter connection.
∗
The pin numbers are for the BH3856S.
Page 5
BH3856S / BH3856FS
Audio ICs
SymbolPin voltageEquivalent CircuitDescription
CC
V
TVO1
TVO2
OUT1
OUT2
SC
BC
TC
VC1
VC2
V
ref
4.5V
4.5V
4.5V
4.5V
−
3.8V
A_GND
V
10pin
24pin
A_GND
CC
V
12pin
19pin
20pin
22pin
21pin
A_GND
CC
V
18pin
A_GND
CC
V
25kΩ
9pin
24pin
CC
Pin for high band filter connection.
Main volume output pin.
OUT1 is the volume output for Channel 1.
OUT2 is the volume output for Channel 2.
Digital
VREF
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.
SDA
SCL
SASS
V
CC
A_GND
D_GND
−
−
Power supply voltage pin.
−
Analog GND pin. Connected to IC board.
Digital GND pin. Separate from Analog GND pin.
−
13pin
15pin
17pin
A_GND
2kΩ
· I2C bass input pin
SDA : serial data line
SCL : serial clock line
ParameterSymbolUnitConditionsMin.Typ.Max.
Quiescent current
Maximum input
Maximum output
Voltage gain
Maximum attenuation
Crosstalk
Low range control width
High range control width
(unless otherwise noted, Ta = 25°C, VCC = 9V, f = 1kHz, BW = 20 ~ 20kHz, VOL = Max.,
Q
I
Vim
Vom
Gv−1.50+1.5dBV
ATT90110−dBVo=1
V
CT
VB Max.
VB Min.
VT Max.
VT Min.
+12+15+18dB100Hz, V
+12+15+18dB100kHz, V
−18
g
= 600Ω, RL = 10kΩ)
−2027mA
2.3
2.32.5−
Vrms
Vrms
−
2.5
7080−dB
−15−12dB100kHz, V
BH3856S / BH3856FS
No signal
THD=1%, VOL=−20dB (ATT)
THD=1%
IN
=1Vrms
Vrms
Vo=1Vrms
IN
=100mVrms
100Hz, VIN=100mVrms−18−15−12dB
IN
=100mVrms
IN
=100mVrms
G
SR
4
−
−
−
3.5
3.0
33
−
40
4
−
6
0.01
45
2
3.8
10
0
47
−
−
−
−
8
0.1
65
10
4.1
−
+1.5
61
10
−
−
1
dB
%
Vrms
µ
µVrms
V
mA
dB
kΩ
Ω
dB
V
V
Matrix surround single-channel gain
Total Harmonic distortion
Output noise voltage
Residual output noise voltage
Reference power supply output voltage
Reference power supply
output current capacity
Channel balance
Input impedance
Output impedance
Ripple rejection ratio
Input high level voltage
Input low level voltage
Measurement performed using Matsushita Communication Industrial VP-9690A DIN AUDIO filter (average value wave detection, effective value display).
∗
Not designed for radiation resistance.
Signal input occurs in equiphase.
THD
V
VM
Vref
Iref
G
R
R
RR
V
V
NO
CB
OUT
1
NO
−1.5
IN
IH
IL
Vrms
Vo=1
Vo=0.5Vrms, BPF=400Hz~30kHz
No signal, VOL=Max.,
No signal, VOL=−
∞
, Rg=0
Rg=0
Iref=3mA
Vref
>
3.7V
channel 1 taken as the standard for
measurements.
f=1kHz
f=1kHz
f=100Hz, V
RR
=1Vrms
SCL, SDA
SCL, SDA
∗
∗
∗
Page 7
Audio ICs
Measurement circuit
!!!!
BH3856S / BH3856FS
V
VAIN11
THD
T1
S1
31
2
V
VAOUT1
10µF10µF
10µF
10k
S3
12
V
VAIN1
V
VOUT1
CC
I V
S5
21
V
CC
4.7k
10µF
A
C1
C2
C3
C4
S6
12
V
CC
0.1µF
0.1µF
2200pF
2200pF
30k
1
2
3
4
5.1k
5
6
7
2.1k2.1k
8
9
10
V
CC
11
200k
12
13
14
15
+−
(Bass)
Volume
Tone
(Treble)
−
+
VolumeVolume
30k
+−
47k
47k
Volume
Matrix surround
Control
Reference voltage
+−
Fig.1
V
CC
BH3856S
(Bass) (Treble)
Tone
−
+
5.1k
30k
30k
30k
30k
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
1000µF
µ
F
0.1
0.1µF
2200pF
2200pF
VVC1
VVC2
VTC
VBC
S4
4.7k
10µF
10µF
Units : R [Ω]
C [F]
0.47µF0.47µF
21
VV
VAIN2
10µF
V
VOUT2
10k
S7
12
1.2k
S2
2
VAOUT2
31
VAIN22
V
THD
T2
V
V1
Note : Diagram depicts the BH3856S.
Page 8
Audio ICs
Performing data settings
!!!!
2
(1) I
C BUS timing
ParameterSymbolMin.Typ.Max.Unit
SCL clock frequency
SCL clock hold time, HIGH state
SCL clock hold time, LOW state
SDA and SDL signal start-up time
SDA and SDL signal shut-down time
Set-up time for re-send [start] conditions
Hold time (re-send) [start] conditions
(After hold time ends, initial clock
pulse is generated.)
Set time for [stop] conditions.
Bus free time between [stop] condition
and [start] condition
Data set-up time
SLC
SCL
HIGH
LOW
0−100kHzf
4−−µst
4.7−−µst
−−1µstr
−−0.3µstf
SU;STA
HD;STA
SU;STO
BUF
SU;DAT
trtf
4.7−−µst
4−−µst
4.7−−µst
4.7−−µst
250−−nst
BH3856S / BH3856FS
SDA start condition
SDA stop condition
SDA
t
SU ; STA
HD ; STA
t
SU ; STO
t
t
LOW
t
SU ; DAT
= start code set-up time.
= start code hold time.
= stop code set-up time.
t
HIGH
t
SU ; STA
t
SU ; STO
I2C BUS timing rules
t
HD ; STA
t
BUF
t
HD ; DAT
t
BUF
= bus free time.
SU ; DAT
= data set-up time.
t
HD ; DAT
= data hold time.
t
Page 9
Audio ICs
(2) I2C BUS data format
MSBLSBMSBLSBMSB LSB
ASAAP
Slave address
1bit8bit1bit8bit1bit8bit1bit 1bit
• S= start condition (start bit recognition)
• Slave address = IC recognition. Upper 7 bits are random. Bottom bit is “L” for the sake of overwrite.
• A= acknowledge bit (recognition of acknowledgment)
• Select address = selection between volume, bass, treble and matrix surround.
• Data= volume and tone data
• P= stop condition (stop bit recognition)
(3) BH3856S / BH3856FS slave address
MSBLSB
A6A5A4A3A2A1A0
• Slave address selection
1) A = 1 (10000010) [SASS pin HIGH]
2) A = 0 (10000000) [SASS pin LOW]
Select addressData
R/W
0000001
A
BH3856S / BH3856FS
(4) Interface protocol
1) Basic protocol
ASAAP
Slave address
MSBLSBMSBLSBMSB LSB
Select addressData
2) Auto increment (Select address increases (+1) by the value of the data.)
S
Slave address
MSBLSBMSBLSBMSBLSB
AA
Select address
Data 1, data 2,...data N
(Example 1) The address data specified by select address is taken as data 1.
(Example 2) The address data specified by select address +1 is taken as data 2.
(Example 3) The address data specified by select address +N−1 is taken as data N.
3) Structure with which transmission is not possible (In this case, only select address 1 is set.)
A
Slave address
S
MSBLSBMSBLSBMSB LSBMSB LSBMSBLSB
A
Select address 1
A
Data
Select address 2
Note : Following transmission of data, data transmitted as select address
2 will not be recognized as select address 2, but as data.
A
P
Data
A
A
P
Page 10
Audio ICs
(5) Specification of select address and data
Function
0 Volume ch1 (L)
1 Volume ch2 (R)
2 Bass
3 Treble
4 Surround
∗
The auto increment function cycles the select address in the manner shown in Figure A.
(Fig. A)
∗
0 → 1 →
↑ ↓
4 ← ← ←
The cycle commences from the initially specified select address.
MSB
0
0
0
0
0
2
3
Select address
0
0
0
0
0
0000100
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
(6) Surround data
MSBLSB
LSB
0
0
0
1
1
0
1
1
D6
VL7D7VL6
VR7 VR6VR5 VR4
00BA5 BA4
00TR5 TR4
0000
BH3856S / BH3856FS
Data
D5
VL5
D4
VL4
D2D1D0
D3
VL2VL1VL0
VL3
VR3
VR2
BA3
BA2
TR2
TR3
0
0
VR1
BA1
TR1
0
VR0
BA0
TR0
SR0
Function
Matrix surround OFF
Matrix surround ON
(7) Matrix surround
Input
Input
L →
R →
MSBLSB
D6
D7
0
00000001
+
+
D5
0000000
+
+
+
Data
D4
Output
(2L−R)
D2D1D0
D3
+
×1
×1
+
Output
(2R−L)
Page 11
BH3856S / BH3856FS
Audio ICs
(8) Volume attenuation (reference values)
ATT
(dB)
0FF−19−56
−1
−2
−3
−4
−5
−6
−7
−8
−9
−10
−11
−12
−13
−14
−15
−16
−17
−18
Note : All figures in this table are reference values. When using this IC, check this table carefully and perform the appropriate setting.
(9) Bass / Treble gain settings (reference values)
ATT
(dB)(HEX)(dB)(HEX)
153F0
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
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.
DATAATTDATA
1F
38−1
35
33
31
2F
2E
2D
2C
2B
2A
29
27
26
25
1F
−2
−3
−4
−5
−6
−7
−8
−9
−10
−11
−12
−13
−14
−15
1C
1B
19
18
17
16
15
13
12
11
0F
0D
0B
08
05
Page 12
Audio ICs
Application example
!!!!
BH3856S / BH3856FS
30k
1
0.47µF0.47µF
C1
C2
C3
C4
10µF
CC
V
33µF
DGND
MICRO
COMPUTER
0.1µF
0.1µF
2200pF
2200pF
2
3
4
5
6
7
8
9
10
11
12
13
14
15
(Bass)
5.1k
(Treble)
2.1k2.1k
CC
V
200k
30k
+
−
Tone
Volume
Matrix surround
−
+
Volume
+
47k
Control
Reference voltage
−
47k
+
Volume
Volume
VCC
−
(Bass)(Treble)
5.1k
Tone
−
+
30k
30k
30k
30k
BH3856S
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
10µF
C1
C2
C3
C4
0.22µF
0.22µF
0.033µF
3.3µF
10µF
AGND
0.1µF
0.1µF
2200pF
2200pF
AGND
DGND
10µF
Note : Diagram depicts the BH3856S.
Fig.2
Page 13
BH3856S / BH3856FS
Audio ICs
Operation notes
!!!!
(1) Operating power supply voltage range
As long as the operating power supply voltage and ambient temperature are kept within the specified range, the basic
circuits are guaranteed to function, but be sure to check the constants as well as the element settings, voltage settings,
and temperature settings.
(2) Bass filter
C1
BVO
−3dB
R1
5.1kΩ
0.1µF
C2
0.1µF
R2
BVNBIN
50kΩ
−
+
IC internal BIAS
1
Vcc
()
2
∗
B.P.F. composed of multiple feedback active f0 can be varied according to the value of C.BIN
IC internal BIAS
1
Vcc
()
2
(theoretical equation)
1
f0 =×
2π
R
2
G =× 1 +
5kΩ
(When R
1.0 × 10
f0 =
1
R1R2C1C
C
1
C
2
1
= 5.1kΩ, R2 = 50kΩ, C1 = C2 = C)
−5
C
1
2
2
−1
Q 1.57
Q × (C1 + C2)
R2C1C
Note : Filter gain is calculated using the equation on the left. Total output
gain is the sum of the gain for each of the internal circuits.
G = 5.0
1
2
1
2
−1
0
f
∆f
Frequency f: (Hz)
Page 14
Audio ICs
(3) About the treble filter
R1
2.1kΩ
C3
2200pF
C4
2200pF
TVO
TVNTIN
R2
25kΩ
BH3856S / BH3856FS
−3dB
−
+
4
−1
IC internal BIAS
1
Vcc
()
2
1
2
Q × (C3 + C4)
Note : The filter gain is given by the formula on the left, but the total output gain
is determined by the this in combination with the internal circuit.
R
R2C3C
1
G = 2.5
Frequency f: (Hz)
f
0
∆f
1
2
4
−1
IC internal BIAS
1
Vcc
()
2
∗
The band-pass filter is constructed using a multiple-feedback active filter.
f
0
can be varied by changing the value of the capacitors.
(Theoretical formulas)
1
f0 =×
2π
R
2
G =× 1 +
5kΩ
(When R
2.2 × 10
f0 =
1
R1R2C3C
C
3
C
4
1
= 2.1kΩ, R2 = 25kΩ, C3 = C4 = C)
−5
C
Q 1.73
(4) I2C BUS control
High-frequency digital signals are input on the SCL and SDA terminals, so ensure that the wiring and PCB pattern is
designed in such a way as to ensure that these signals do not interfere with the analog signal system.
If you are not using I
2
C BUS control (i.e. you are using DC control), connect the SCL, SDA and SASS terminals to GND
(do not leave them disconnected).
(5) Step switching noise
The VC1, VC2, TC, BC and SC terminals have components connected to them the application example. The values of
these components may need to be changed depending on the signal level setting and PCB pattern.
Investigate carefully before deciding on the values of the various circuit constants.
The equivalent circuit for these terminals is given below (an integrator circuit is set at the first stage to slow the variation).
Each Pin
R
C
+
−
VC1, VC2, BC, TC
SC
R value (kΩ)
30
200
(6) Volume and tone level settings
This specification sheet gives reference values for the amount of attenuation and gain with respect to the serial control
data. The internal D / A convertor is an R-2R circuit, and data exists for the places where continuous variation does not
occur between data. Use this when fine setting is required. The setting limits are up to 8 bits for volume (256 steps) and 6
bits (64 steps) for tone.
Page 15
BH3856S / BH3856FS
Audio ICs
(7) Digital / analog separation
The digital and analog power supplies and grounds for this IC (BH3856) are completely separate. The digital circuits are
supplied from a stable reference source that is on the chip (V
timing shifts, on interference due to digital noise.
(8) Matrix surround
Input
L →
+
+
+
+
Output
(2L-R)
+
+
Input
R →
∗
The matrix surround circuit construction is as shown in the diagram above. The gain is obtained from the formulas
×1
×1
+
Output
(2R-L)
in the diagram.
ref
(3.8V)). For this reason, there is no need to worry about
Phase Gain
Negative Phase Gain
0dB
6dB
(However, reverse-phase gain is for input to one channel only)
(9) DC control
An internal impedance of 30kΩ is seen from the VC1, VC2, TC and BC terminals, are 200kΩ is seen from the SC (pin 11)
terminal, so with regard to DC control, we recommend direct control with the voltage source. When using variable volume,
take the impedance into consideration when making the setting.
Note : The DC control voltage range is 0V to V
Do not apply voltages above V
ref
ref
.
to the terminals.
(10) GND
• As shown in the application circuit example, connect the external component GND to the analog GND.
• However, the GND for the capacitor connected to the V
• If a capacitor with goof high-frequency characteristics is connected in parallel with the capacitor connected to V
ref
terminal should be connected to the digital GND.
ref
, the
performances of the circuit with respect to static noise will improve (we recommend a ceramic capacitor of between
0.001µF and 0.1µF)
• When using long digital and analog ground lines, take care to ensure that there is no potential difference between the
two ground lines.
Page 16
Audio ICs
Electrical characteristic curves
!!!!
24
22
20
(mA)
18
Q
16
14
12
10
8
6
4
QUIESCENT CURRENT : I
2
0
56
POWER SUPPLY VOLTAGE : VCC
78910
Fig. 3 Quiescent curve vs.
Power supply voltage
External dimensions
!!!!
R
(Units : mm)
L
= 10kΩ
(V)
BH3856S / BH3856FS
1
(%)
0.4
0.1
0.04
TOTAL HARMONIC DISTORTION : THD
0.01
−40−30010−20−10
INPUT VOLTAGE : VIN
VCC = 9V
f = 1kHz
(dBV)
Fig.4 Total harmonic distortion vs.
Input voltage
25
20
15
(dB)
10
BT
5
0
−5
−10
VOLTAGE GAIN : G
−15
−20
−25
101001k10k100k
FREQUENCY : f
(Hz)
VCC = 9V
L
= 10kΩ
R
Fig. 5 Output gain vs. Frequency
BH3856S
0.51Min.
0.3
±
4.7
0.2
±
3.2
BH3856FS
28.0
±
0.3
30
1.778
SDIP30
16
0.3
±
8.4
151
0.5
±
0.1
10.16
0°~15°
0.3±0.1
7.8±0.3
1.8±0.1
13.6±0.2
32
5.4±0.2
1
0.8
0.11
0.36±0.1
17
16
0.15±0.1
0.3Min.
0.15
SSOP-A32
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