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