Datasheet BH3856S, BH3856FS Datasheet (ROHM)

Page 1
Audio ICs
2-wire serial sound control IC
BH3856S / BH3856FS
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 (I
2
C BUS) enables them to control
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
!!!!
Parameter Symbol Limits Unit
Power supply voltage 10.0 V
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
!!!!
Parameter Symbol Min. Typ. Max. Unit
Power supply voltage 6.0 9 9.5 VV
Note : I2C BUS is a registered trademark of Philips.
CC
(Ta = 25°C)
Page 2
Audio ICs
Block diagram
!!!!
BH3856S / BH3856FS
BH3856S
1
A_GND
2
IN1
3
BVN1
BIN1
4
5
BVO1
6
TVN1
7
TIN1
8
TVO1
9
OUT1
10
V
CC
11
SC
12
N.C.
13
SDA
14
SCL
D_GND
15
BH3856FS
1
A_GND
2
IN1
3
BVN1
4
BIN1
5
N.C.
6
BVO1
7
TVN1
TIN1
8
TVO1
9
10
OUT1
11
CC
V
12
SC
13
SDA
14
N.C.
15
SCL
D_GND
16
30k 30k
47k
+
(Bass) (Treble)
5.1k
Tone
Volume
Matrix surround
2.1k 2.1k
+
Volume Volume
V
CC
200k
Reference Voltage
30k 30k
47k
+
−−
Tone
Volume
Matrix surround
+
Volume
Reference Voltage
5.1k
2.1k
V
200k
(Bass)
(Treble)
CC
−−
Control
−−
Control
47k
47k
+
Volume
+
Volume
Volume
V
CC
(Bass) (Treble)
Tone
+
V
CC
(Bass)
Tone
(Treble)
+
5.1k
30k 30k
30k
30k
5.1k
2.1k
30k 30k
30k
30k
30
FILTER
29
IN2
28
BVN2 BIN2
27
BVO2
26
25
TVN2
TIN2
24
TVO2
23
OUT2
22
21
VC1
VC2
20
19
TC
18
BC
17
V
ref
SLAVE ADDRESS
16
SELECT SW
32
FILTER
31
IN2
30
BVN2
29
N.C. BIN2
28
27
BVO2
26
TVN2
25
TIN2
24
TVO2
23
OUT2
22
VC1
VC2
21
TC
20
BC
19
18
V
ref
SLAVE ADDRESS
17
SELECT SW
Page 3
Audio ICs
Pin descriptions
!!!!
Pin No.
BH3856S BH3856FS
1 2 3 4 5 6 7 8
9 10 11 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 12
1 A_GND 2 IN1 3 BVN1 4 BIN1 6 7
9
11 12 13 15 16 17 18 19 20 21 22 23 24 25 26 27 28 30 31 32
5, 14, 29
Pin name
BVO1 TVN1
TIN1 Channel 1 treble filter8
TVO1 OUT110
V
CC
SC
SDA
SCL
D_GND
SASS
V
ref
BC
TC VC2 VC1
OUT2 TVO2
TIN2 TVN2 BVO2
BIN2 BVN2
IN2
FILTER
N.C.
BH3856S / BH3856FS
Function
Analog ground Channel 1 volume input Channel 1 bass filter Channel 1 bass filter Channel 1 bass filter Channel 1 treble filter
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
FILTER 5.2V
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.
47k
2/1V
CC
CC
50k
3pin 30pin
CC
5.1k
2/1V
CC
CC
50k
CC
30k
Designed for input impedance of 47kTyp.).
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
30k
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
25k
7pin 26pin
2.1k
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
Symbol Pin voltage Equivalent Circuit Description
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
25k
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
2k
· 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.
Page 6
Audio ICs
Electrical characteristics
!!!!
TONE = ALL FLAT, R
Parameter Symbol Unit ConditionsMin. 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 1.5 0 +1.5 dB V
ATT 90 110 dB Vo=1
V
CT
VB Max.
VB Min.
VT Max.
VT Min.
+12 +15 +18 dB 100Hz, V
+12 +15 +18 dB 100kHz, V
18
g
= 600Ω, RL = 10kΩ)
20 27 mA
2.3
2.3 2.5
Vrms Vrms
2.5
70 80 dB
15 12 dB 100kHz, V
BH3856S / BH3856FS
No signal THD=1%, VOL=−20dB (ATT) THD=1%
IN
=1Vrms
Vrms
Vo=1Vrms
IN
=100mVrms
100Hz, VIN=100mVrms−18 −15 −12 dB
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
k
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
2.1k 2.1k
8
9
10
V
CC
11
200k
12
13
14
15
+
(Bass)
Volume
Tone
(Treble)
+
Volume Volume
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 []
C [F]
0.47µF0.47µF
21
V V
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
Parameter Symbol Min. 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
0 100 kHzf 4 −−µst
4.7 −−µst
−−1 µstr
−−0.3 µstf
SU;STA
HD;STA
SU;STO
BUF
SU;DAT
tr tf
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
MSB LSB MSB LSB MSB LSB
ASAAP
Slave address
1bit 8bit 1bit 8bit 1bit 8bit 1bit 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
MSB LSB
A6 A5 A4 A3 A2 A1 A0
• Slave address selection
1) A = 1 (10000010) [SASS pin HIGH]
2) A = 0 (10000000) [SASS pin LOW]
Select address Data
R/W
0000001
A
BH3856S / BH3856FS
(4) Interface protocol
1) Basic protocol
ASAAP
Slave address
MSB LSB MSB LSB MSB LSB
Select address Data
2) Auto increment (Select address increases (+1) by the value of the data.)
S
Slave address
MSB LSB MSB LSB MSB LSB
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
MSB LSB MSB LSB MSB LSB MSB LSBMSB LSB
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
MSB LSB
LSB
0
0
0
1
1
0
1
1
D6
VL7D7VL6
VR7 VR6 VR5 VR4
0 0 BA5 BA4 0 0 TR5 TR4 0000
BH3856S / BH3856FS
Data
D5
VL5
D4
VL4
D2 D1 D0
D3
VL2 VL1 VL0
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
MSB LSB
D6
D7
0 00000001
+
+
D5
0000000
+
+
+
Data
D4
Output
(2LR)
D2 D1 D0
D3
+
×1
×1
+
Output
(2RL)
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.
DATA (HEX)
E4 20 D8 60 CF 62 C8 64 C2 66 BD 68 B8 70 B2 72 AD 74 A9 76 A5 78 A0 9C 98 94 90 8C 89
ATT DATA (dB) (HEX)
85 82
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
7C 78 74 70 6D 6A 68 65 61 5C 59 55 52 4E 4B 48 45
ATT DATA (dB) (HEX)
58
80
82
84
86
90
100
112
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) (HEX) (dB) (HEX)
15 3F 0 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.
DATA ATT DATA
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
0.47µF 0.47µF
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)
2.1k 2.1k
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
5.1k
0.1µF
C2
0.1µF
R2
BVNBIN
50k
+
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 +
5k
(When R
1.0 × 10
f0 =
1
R1R2C1C
C
1
C
2
1
= 5.1k, R2 = 50k, 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
2.1k
C3
2200pF
C4
2200pF
TVO
TVNTIN
R2 25k
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 +
5k
(When R
2.2 × 10
f0 =
1
R1R2C3C
C
3
C
4
1
= 2.1k, R2 = 25k, 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 (k)
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
= 10k
(V)
BH3856S / BH3856FS
1
(%)
0.4
0.1
0.04
TOTAL HARMONIC DISTORTION : THD
0.01
40 30 0 10−20 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
10 100 1k 10k 100k
FREQUENCY : f
(Hz)
VCC = 9V
L
= 10k
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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