ROHM BD3812F Technical data
*
1
Sound Processors for Home Theater Systems
2ch
Electronic Volume
BD3812F
●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
No.10081EAT03
Powewr supply voltage
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 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.
*2 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 Symbol
Operating source voltage
VCC 7.5
VEE -7.5
Min. Typ. Max.
VCC 5 7 7.3
VEE -7.3 -7 -5
Ratings
V
Unit
V
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© 2010 ROHM Co., Ltd. All rights reserved.
1/9
2010.06 - Rev.A
BD3812F
●Electrical characteristics
Ta =2 5℃, VCC=7V, VEE＝-7V, f=1kHz, Vin=1Vrms, RL=10kΩ, Rg=600Ω, Master volume=0dB, Output gain=0dB , unless
otherwise specified.
Parameter
VCC
Circuit current
VEE -6 -2 ―
Output voltage gain Gv -2 0 2 dB Measure : Pin14, 13
Symbol
IQ
Min. Typ. Max.
Limits
― 2 6
Unit Conditions
mA No signal
Technical Note
Total harmonic distortion ratio THD ― 0.005 0.09 %
Maximum output voltage Vomax 3.4 4.2 ― Vrms
Output noise voltage Vno ― 1.2 5 µVrms
Input impedance Rin 20 30 40 kΩ Measure : Pin1, 3
Cross talk between channels
1ch→2ch
Cross talk between channels
2ch→1ch
Volume control range GVR -106 -103 -100 dB
Volume set error 1 VE1 -2 0 2 dB
Volume set error 2 VE2 -3 0 3 dB
CTC12 ― -100 -70 dB
CTC21 ― -100 -70 dB
Measure : Pin14, 13
BW=400～30kHz
Measure : Pin14, 13
THD=1%
Measure : Pin 14, 13
Rg=0Ω, BW=IHF-A
Measure : Pin13(OUT2)
Rg=0Ω, BW=IHF-A
Reference : Pin14(OUT1)=1Vrms
Measure : Pin14(OUT1)
Rg=0Ω, BW=IHF-A
Reference : Pin13(OUT2)=1Vrms
Measure : Pin 14, 13
Vin=3Vrms
Measure : Pin 14, 13
0 to –53dB, Vin=3Vrms
Measure : Pin 14, 13
-54 to –103dB, Vin=3Vrms
Maximum attenuation Vmin ― -118 -105 dB
Output gain control range GOG 16 18 20 dB
Output gain set error GOE -2 0 -2 dB
* This product is not of “anti radiation design”.
Measure : Pin 14, 13
BW=IHF-A, Vin=3Vrms
Measure : Pin 14, 13
Vin=0.4Vrms
Measure : Pin 14, 13
Vin=0.4Vrms
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© 2010 ROHM Co., Ltd. All rights reserved.
2/9
2010.06 - Rev.A
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.
CL
(CLOCK)
90% 90% 90% 90%
twc
twc
10% 10% 10%
thd thdth ts tsl thl tsd
DA
DATA
LATCH
90% 90% 90%
twd
DATA DATA
twh
10%
Fig.1
Parameter Symbol
Min. Typ. Max.
90% 90%
twl
LATCH
10% 10%
Limits
Te rm in at e
with Low.
Technical Note
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)
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 Condition
“H”input voltage
“L” input voltage 0 － 1.0 V
Vcc=5～7.3V
VEE=-5～-7.3V
tsd 1.0 － － µs
Limits
Min. Typ. Max.(≦Vcc)
Unit
2.2 － 5.5 V
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© 2010 ROHM Co., Ltd. All rights reserved.
3/9
2010.06 - Rev.A
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