Sound Processors for Home Theater Systems
2ch
Electronic Volume
BD3812F
No.10081EAT03
●Description
BD3812F is an electronic volume having volume, gain amplifier functions necessary for applications in AV receivers, home
theatre systems, min-component systems and so forth. Having a chip select terminal, it can be controlled until 4 chips with
common bus line.
●Features
1) Residual noise : 1.2µVrms {dynamic range : 131dB (IHF-A)}
2) 2ch independent volume (0 to -103dB, MUTE 1dB/step)
3) 8ch at maximum available in combination of any of BD3811K1, BD3813KS, BD3814FV, BD3815KS (6ch volume)
in common bus line
4) It can be controlled until 4 chips with common bus line at the same time
5) Maximum output voltage : 4.2Vrms (Vcc=7, VEE=-7V, RL=10kΩ)
6) 2-line serial control (for both 3.3V and 5V)
7) Built-in Output gain amplifier for adjustment of output signal voltage (0, 6 to 18dB, 2dB/step)
8) Output mute controllable by serial data and external control terminal
●Applications
AV receivers, home theater systems, mini-component systems, etc.
●Absolute maximum ratings (Ta=25℃)
Parameter
Symbol
Ratings
Unit
*1
Powewr supply voltage
VCC
VEE
7.5
-7.5
V
Input signal voltage
VIN
VCC+0.3 to VEE-0.3
V
Power dissipation
Pd
450*2
mW
Operating temperature range
Topr
－20 to +75
℃
Storage temperature range
Tastg
－55 to +125
℃
*1
*2
Even in the specified range of Power Supply Voltage, applying voltage only to the VCC side may
cause an excessive current to give a permanent damage to the IC.
When starting up power supplies, VEE and VCC should be powered on simultaneously or VEE first; then followed by VCC.
Over Ta＝25°C, reduce at the rate of 4.5mW/°C. When installed on the standard board (size: 70x70x1.6mm).
●Operating conditions
It must function normally at Ta＝25°C.
Parameter
Operating source voltage
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Symbol
VCC
VEE
Min.
5
-7.3
Ratings
Typ.
7
-7
1/9
Max.
7.3
-5
Unit
V
2010.06 - Rev.A
Technical Note
BD3812F
●Electrical characteristics
Ta=25℃, VCC=7V, VEE＝-7V, f=1kHz, Vin=1Vrms, RL=10kΩ, Rg=600Ω, Master volume=0dB, Output gain=0dB , unless
otherwise specified.
Limits
Parameter
Unit
Conditions
Symbol
Min.
Typ.
Max.
―
2
6
-6
-2
―
Gv
-2
0
THD
―
Vomax
Output noise voltage
Input impedance
Circuit current
VCC
IQ
mA
No signal
2
dB
Measure : Pin14, 13
0.005
0.09
%
Measure : Pin14, 13
BW=400～30kHz
3.4
4.2
―
Vrms
Measure : Pin14, 13
THD=1%
Vno
―
1.2
5
µVrms
Measure : Pin 14, 13
Rg=0Ω, BW=IHF-A
Rin
20
30
40
kΩ
Measure : Pin1, 3
Cross talk between channels
1ch→2ch
CTC12
―
-100
-70
dB
Measure : Pin13(OUT2)
Rg=0Ω, BW=IHF-A
Reference : Pin14(OUT1)=1Vrms
Cross talk between channels
2ch→1ch
CTC21
―
-100
-70
dB
Measure : Pin14(OUT1)
Rg=0Ω, BW=IHF-A
Reference : Pin13(OUT2)=1Vrms
Volume control range
GVR
-106
-103
-100
dB
Measure : Pin 14, 13
Vin=3Vrms
Volume set error 1
VE1
-2
0
2
dB
Measure : Pin 14, 13
0 to –53dB, Vin=3Vrms
Volume set error 2
VE2
-3
0
3
dB
Measure : Pin 14, 13
-54 to –103dB, Vin=3Vrms
Maximum attenuation
Vmin
―
-118
-105
dB
Measure : Pin 14, 13
BW=IHF-A, Vin=3Vrms
Output gain control range
GOG
16
18
20
dB
Measure : Pin 14, 13
Vin=0.4Vrms
Output gain set error
GOE
-2
0
-2
dB
Measure : Pin 14, 13
Vin=0.4Vrms
VEE
Output voltage gain
Total harmonic distortion ratio
Maximum output voltage
* This product is not of “anti radiation design”.
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2/9
2010.06 - Rev.A
Technical Note
BD3812F
●Timing chart
1) Signal timing conditions
・Data is read on the rising edge of the clock.
・Latch is read on the falling edge of the clock.
・Latch signal must terminate with the LOW state.
* To avoid malfunctions, clock and data signals must terminate with the LOW state.
90%
CL
(CLOCK)
90%
twc
10%
thd
DA
DATA
LATCH
90%
twd
ts
90%
DATA
90%
90%
10%
10%
twc
th
tsd
tsl
DATA
10%
thl
90%
90%
twh
10%
thd
10%
twl
LATCH
Terminate
with Low.
Fig.1
Parameter
90%
Limits
Symbol
Min.
Typ.
Max.
Unit
Minimum clock width
twc
2.0
－
－
µs
Minimum data width
twd
2.0
－
－
µs
Minimum latch width
twl
2.0
－
－
µs
LOW hold width
twh
2.0
－
－
µs
Data setup time
(DATA→CLK)
tsd
1.0
－
－
µs
Data hold time(CLK→DATA)
thd
1.0
－
－
µs
Latch setup time(CLK→LATCH)
tsl
1.0
－
－
µs
Latch hold time(DATA→LATCH)
thl
1.0
－
－
µs
Latch low setup time
ts
1.0
－
－
µs
Latch low hold time
th
1.0
－
－
µs
2) Voltage conditions for control signal
Parameter
“H”input voltage
“L” input voltage
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Limits
Condition
Vcc=5～7.3V
VEE=-5～-7.3V
3/9
Unit
Min.
Typ.
Max.(≦Vcc)
2.2
－
5.5
V
0
－
1.0
V
2010.06 - Rev.A
Technical Note
BD3812F
3) Basic configuration of control data format
Input direction
MSB
D16
D15
D14
D13
D12
LSB
D11
D10
Data
D8
D7
D6
D5
D4
D3
Data
・Control data format
Input direction
D16 D15 D14 D13 D12 D11
Data
①
Master Volume 2ch
Data
②
D9
D2
D1
D0
Select Address
Select Address
D10
D9
D8
D7
D6
D5
D4
D3
Master Volume 1ch
D16
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
*
*
*
*
*
*
*
*
*
*
*
D5
D4
D3
Output gain amp
D2
D1
D0
1
1
0
D2
D1
D0
1
1
1
* is 0 or 1.
By changing the setting of select address, 4 control data formats can be selected.
Do not set the select address data to other than specified above.
At power on, initialize all the data.
Input direction
MSB
LSB
MSB
Data①
L
Data②
LSB
L
“L” shows latch.
After power on, in the second time or after, only data you want to change can be set.
(Example) When to change bus
Input direction
MSB
LSB
Data①
L
“L” shows latch.
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4/9
2010.06 - Rev.A
Technical Note
BD3812F
4) SEL terminal setting
By determining the SEL terminal voltage, select address can be fixed.
An example of the SEL terminal voltage setting method is shown below.
Setting
P1
Condition
P2
Condition
VEE
－
Setting of
SEL(12pin) Terminal
SEL(12pin)
Terminal Voltage(V)
Select Address
D2
D1
VEE
0
0
VCC/3+2×VEE/3
0
1
VCC/3
1
0
VCC
1
1
P1
Setting 1
VEE
12
20k
VCC
P1
Setting 2
VCC
VEE
12
P2
VEE
10k
10k
VCC
Setting 3
VCC
VEE
P1
12
P2
VEE
20k
P1
Setting 4
VCC
－
VCC
12
SEL terminal voltage is DGND standard.
When to use several chips of BD3812F
Select address can be changed by setting SEL terminal (12pin), therefore, up to 4 chips can be used on a same bus line.
When to use one chip or two chips of this IC, use the setting 1 and the setting 4. In this case, the terminal voltage of 12pin
may be VCC or VEE, therefore external resistor of 12pin is unnecessary.
When to use BD3812F and BD3811K1 at the same time
By using BD3812F and BD3811K1 at the same time, independent control of 8ch volume can be made. And control is
available on a same bus line. In this case, be sure to set the SEL terminal setting to “setting 4”.
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5/9
2010.06 - Rev.A
Technical Note
BD3812F
●Application circuit
10µ
IN1
AGND
IN2
1
14
OUT1
2
13
OUT2
3
12
SEL
4
11
5
10
MUTE
9
DA
8
CL
10μ
AGND
V EE
DGND
47μ
6
AGND
LOGIC
47µ
V CC
7
UNIT
RESISTOR :Ω
CAPACITOR : F
Fig.2
●Reference data
10
OUTPUT VOLTAGE (Vrms)
10
VCC
2
8
1.5
6
1
4
GAIN(dB)
CIRCUIT CURRENT (mA)
2.5
0.5
0
-0.5
2
0
-2
-4
-1
VEE
-1.5
-6
-2
-8
-2.5
-10
0
2
4
6
8
POWER SUPPLY (V)
1000
10000
10
20
1
15
0.1
0.01
0.001
0.01
0.001
100000
10
0.01
0.1
1
10
INPUT VOLTAGE (Vrms)
Fig.5 Output voltage - Input voltage
Fig.4 Voltage gain - Frequency
GAIN (dB)
THD+N (%)
100
FREQUENCY (Hz)
Fig.3 Circuit current - Power supply
0.1
0.001
10
10
1
0, 6～18dB
2dB/step
5
0
0.0001
-5
0.001
0.01
0.1
1
10
INPUT VOLTAGE (Vrms)
Fig.6 THD+N - Input voltage
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10
100
1000
10000
100000
FREQUENCY (Hz)
Fig.7 Output gain - Frequency
6/9
2010.06 - Rev.A
Technical Note
BD3812F
●Notes for use
(1) Numbers and data in entries are representative design values and are not guaranteed values of the items.
(2) Although we are confident in recommending the sample application circuits, carefully check their characteristics further
when using them. When modifying externally attached component constants before use, determine them so that they
have sufficient margins by taking into account variations in externally attached components and the Rohm LSI, not only for
static characteristics but also including transient characteristics.
(3) Absolute maximum ratings
If applied voltage, operating temperature range, or other absolute maximum ratings are exceeded, the LSI may be
damaged. Do not apply voltages or temperatures that exceed the absolute maximum ratings. If you think of a case in
which absolute maximum ratings are exceeded, enforce fuses or other physical safety measures and investigate how not
to apply the conditions under which absolute maximum ratings are exceeded to the LSI.
(4) VEE potential
Make the VEE pin voltage such that it is the lowest voltage even when operating below it. Actually confirm that the
voltage of each pin does not become a lower voltage than the VEE pin, including transient phenomena.
(5) Thermal design
Perform thermal design in which there are adequate margins by taking into account the allowable power dissipation in
actual states of use.
(6) Shorts between pins and misinstallation
When mounting the LSI on a board, pay adequate attention to orientation and placement discrepancies of the LSI. If it is
misinstalled and the power is turned on, the LSI may be damaged. It also may be damaged if it is shorted by a foreign
substance coming between pins of the LSI or between a pin and a power supply or a pin and a GND.
(7) Operation in strong magnetic fields
Adequately evaluate use in a strong magnetic field, since there is a possibility of malfunction.
(8) Serial control
For the CL and DA terminals, the patterned and other wirings should be routed not to cause interference with the
analog-signal-related lines.
(9) About power ON/OFF
(a) At power ON/OFF, a shock sound will be generated and, therefore, use MUTE on the set.
(b) When turning on power supplies, VEE and VCC should be powered on simultaneously or VEE first;
then followed by VCC. If the VCC side is started up first, an excessive current may pass VCC through VEE.
(10) Function switching
For the functions except master volume, use MUTE on the set.
(11) Reduction of switching noise when changing volume from -3dB to -4dB
In order to reduce switching noise when changing volume from -3dB to -4dB, after switching the switch of -4dB step,
change the switch of -1dB step by -1dB.
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7/9
2010.06 - Rev.A
Technical Note
BD3812F
●Thermal derating characteristic
500
450mW
Power Dissipation Pd （mW)
400
300
200
100
0
0
25
50
75
100
125
Ta( ℃)
Fig.8
BD3812
ROHM standard board packaging time value
Board size : 70 x 70 x 1.6mm Raw material : FR4 glass epoxy board (copper area 3% or below)
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8/9
2010.06 - Rev.A
Technical Note
BD3812F
●Ordering part number
B
D
3
Part No.
8
1
2
F
Part No.
-
Package
F:SOP14
E
2
Packaging and forming specification
E2: Embossed tape and reel
SOP14
<Tape and Reel information>
8.7 ± 0.2
(MAX 9.05 include BURR)
8
Tape
Embossed carrier tape
Quantity
2500pcs
Direction
of feed
0.3MIN
4.4±0.2
6.2±0.3
14
1
E2
The direction is the 1pin of product is at the upper left when you hold
( reel on the left hand and you pull out the tape on the right hand
)
7
0.11
1.5±0.1
0.15 ± 0.1
1.27
0.4 ± 0.1
0.1
1pin
(Unit : mm)
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Reel
9/9
Direction of feed
∗ Order quantity needs to be multiple of the minimum quantity.
2010.06 - Rev.A
Notice
Notes
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consent of ROHM Co.,Ltd.
The content specified herein is subject to change for improvement without notice.
The content specified herein is for the purpose of introducing ROHM's products (hereinafter
"Products"). If you wish to use any such Product, please be sure to refer to the specifications,
which can be obtained from ROHM upon request.
Examples of application circuits, circuit constants and any other information contained herein
illustrate the standard usage and operations of the Products. The peripheral conditions must
be taken into account when designing circuits for mass production.
Great care was taken in ensuring the accuracy of the information specified in this document.
However, should you incur any damage arising from any inaccuracy or misprint of such
information, ROHM shall bear no responsibility for such damage.
The technical information specified herein is intended only to show the typical functions of and
examples of application circuits for the Products. ROHM does not grant you, explicitly or
implicitly, any license to use or exercise intellectual property or other rights held by ROHM and
other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the
use of such technical information.
The Products specified in this document are intended to be used with general-use electronic
equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices).
The Products specified in this document are not designed to be radiation tolerant.
While ROHM always makes efforts to enhance the quality and reliability of its Products, a
Product may fail or malfunction for a variety of reasons.
Please be sure to implement in your equipment using the Products safety measures to guard
against the possibility of physical injury, fire or any other damage caused in the event of the
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R1010A