ROHM BD3811K1 Technical data

Sound Processors for Home Theater Systems

5.1ch
Sound Processor

BD3811K1,BD3818KS

●Description

BD3811K1 and BD3818KS are 5.1ch sound processors, with built-in Mode Selector/Input Selector. Functions, including
6-ch Volume, Gain Amp, Bass, Treble, Mixing (BD3818KS), Dynamic Bass Boost (BD3818KS) and Bass Boost (BD3811K1)
are integrated into a single chip.

●Features

1) Independent 6 channels for Master Volume (0 to -103dB, 1dB/Step, MUTE, BD3811K1)
(0 to -95dB 1dB/Step, MUTE, BD3818KS)
Implementation of a resistance ladder type circuit reduces residual noise and a shock sound at switching.

2) Low current consumption design achieved by adopting the BiCMOS process

3) Maximum output voltage (BD3818KS): 4.3Vrms (Vcc=7V, VEE=-7V, RL=10kΩ)
Maximum output voltage (BD3811K1): 4.2Vrms (Vcc=7V, VEE=-7V, RL=10kΩ)

4) Built-in Input Gain Amp useful for adjusting the output signal voltages

5) Built-in Operational Amplifier useful for filter construction (BD3818KS)

6) Built-in Dynamic Bass Boost circuit (BD3818KS)

7) 2-wire serial control (BD3818KS for 5V, BD3811K1 for both 3.3V and 5V)

8) Built-in Output Gain Amp useful for adjusting the output signal voltages (BD3811K1)

9) REC output terminal with a REC input/output switch useful for monitoring Equalizer Amp (BD3811K1)

10) Output mute controlled by either serial data or an external control terminal

●Applications

AV receivers, home theater systems and mini-audio systems.

●Line up matrix

No.10081EAT02

Parameter BD3811K1 BD3818KS

Input Selector 8 inputs 5 inputs

Input Gain 2Step 4 Step or 2 Step

Volume 0 to -103dB 1dB/Step 0 to -95dB 1dB/Step

Bass, Treble 14dB 2dB/Step 14dB 2dB/Step

Output Gain 0, 6 to 18dB 2dB/Step Variable depending on the external resistance

Mixing No Yes

Bass Boost 0 to 12dB, 4dB/Step

Package QFP80 SQFP80

0 to 12dB, 4dB/Step
Dynamic type

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1/17

2010.06 - Rev.A

BD3811K1,BD3818KS

*

1

Technical Note

●Absolute maximum ratings (Ta=25℃)

Parameter

Power Supply Voltage

Symbol Ratings Unit

VCC 7.5
VEE -7.5

V

Input Signal Voltage VIN VCC+0.3 to VEE-0.3 V
Power Dissipation Pd 1200 *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 Reduced by 12 mW/℃ over 25℃, when installed on the standard board (size: 70x70x1.6mm).

●Operating range

It must function normally at Ta=25℃.

Part No. Parameter Symbol

BD3811K1 Operating Supply Voltage

BD3818KS Operating Supply Voltage

VCC 5 7 7.3

VEE -7.3 -7 -5

VCC 5 7 7.4

VEE -7.4 -7 -5

Ratings

Min. Typ. Max.

Unit

V

V

●Electrical characteristics

1) BD3811K1 (T a=25℃, VCC=7V, VEE=-7V, f=1kHz, Vin=1Vrms, RL=10kΩ, Rg=600Ω, Input ATT=0dB,
Input gain=0dB, Master volume=0dB, Output gain=0dB, Bass, Treble and bass boost=0dB, unless otherwise noted.)

Circuit Current

Parameter Symbol

VCC
VEE -30 -15 ―

IQ

Limits

Min. Typ. Max.

― 15 30

Unit Conditions

mA No signal

Output Voltage Gain 1ch Gv1 -2 0 2 dB Measure : Pin55

Output Voltage Gain 2ch Gv2 -2 0 2 dB Measure : Pin57
Total Harmonic Distortion

Ratio 1ch
Total Harmonic Distortion

Ratio 2ch

THD1 ― 0.005 0.09 %

THD2 ― 0.005 0.09 %

Maximum Output Voltage 1ch Vomax1 3.4 4.2 ― Vrms

Maximum Output Voltage 2ch Vomax2 3.4 4.2 ― Vrms

― 2.5 12 µVrms

Output Noise Voltage 1ch Vno1

― 2.0 9.0 µVrms

Total Output

Output Noise Voltage 2ch Vno2

― 2.5 12 µVrms
― 2.0 9.0 µVrms

Measure : Pin55
BW=400～30kHz

Measure : Pin57
BW=400～30kHz

Measure : Pin55
THD=1%

Measure : Pin57
THD=1%

Measure : Pin 55 Rg=0Ω,
Tone: ON BW=IHF-A
Measure : Pin 55 Rg=0Ω,
By Pass mode BW=IHF-A
Measure : Pin 57 Rg=0Ω,
Tone: ON BW=IHF-A
Measure : Pin 57 Rg=0Ω,
By Pass mode BW=IHF-A

Input Impedance 1ch Rin1 28 47 70 kΩ Measure : Pin1, 3, 5, 7, 9, 11, 77, 79

Input Impedance 2ch Rin2 28 47 70 kΩ Measure : Pin2, 4, 6, 8, 10, 12, 78, 80
Cross-talk between Channels

1ch2ch
Cross-talk between Channels

2ch1ch
Cross-talk

between Selectors 1ch
Cross-talk

between Selectors 2ch

CTC12 ― -100 -70 dB

CTC21 ― -100 -70 dB

CTS1 ― -100 -70 dB

CTS2 ― -100 -70 dB

Measure : Pin57(OUT2)
Rg=0Ω, BW=IHF-A
Reference : Pin55(OUT1)=1Vrms
Measure : Pin55(OUT1)
Rg=0Ω, BW=IHF-A
Reference : Pin57(OUT2)=1Vrms

Measure : Pin 55
Rg=0Ω, BW=IHF-A

Measure :Pin 57
Rg=0Ω, BW=IHF-A

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© 2010 ROHM Co., Ltd. All rights reserved.

2/17

2010.06 - Rev.A

BD3811K1,BD3818KS

R Output Impedance 1ch RoutR1 ― 100 200 Ω Measure : Pin 71, 73, 75

R Output Impedance 2ch RoutR2 ― 100 200 Ω Measure : Pin 72, 74, 76

Parameter Symbol

Limits

Min. Typ. Max.

Technical Note

Unit Conditions

R Voltage Gain 1ch GVR1 -2 0 2 dB

R Voltage Gain 2ch GVR2 -2 0 2 dB

REC Out

R Total Harmonic Distortion
Ratio 1ch

R Total Harmonic Distortion
Ratio 2ch

V Output Voltage Gain 1ch GVV1 -2 0 2 dB Measure : Pin 36, 38

V Output Voltage Gain 2ch GVV2 -2 0 2 dB Measure : Pin 35, 37
V Total Harmonic Distortion

Ratio 1ch
V Total Harmonic Distortion

Ratio 2ch
V Output Noise Voltage 1ch VnoV1 ― 1.5 8 µVrms

V Output Noise Voltage 2ch VnoV2 ― 1.5 8 µVrms

Volume Control Range 1ch GVR1 -106 -103 -100 dB

Volume Control Range 2ch GVR2 -106 -103 -100 dB

Volume Output

Volume Setting Error 1 1ch VE11 -2 0 2 dB

Volume Setting Error 1 2ch VE12 -2 0 2 dB

Volume Setting Error 2 1ch VE21 -3 0 3 dB

Volume Setting Error 2 2ch VE22 -3 0 3 dB

Maximum Attenuation 1ch Vmin1 ― -118 -105 dB

Maximum Attenuation 2ch Vmin2 ― -118 -105 dB
Input Attenuation

Control Range 1ch
Input Attenuation

Control Range 2ch
Input Attenuation

Setting Error 1ch
Input Attenuation

Input Attenuation

Setting Error 2ch
Input Gain

Control Range 1ch
Input Gain

Control Range 2ch
Input Gain Setting Error 1ch GIE1 -2 0 2 dB

Input Gain

Input Gain Setting Error 2ch GIE2 -2 0 2 dB

THDR1 ― 0.005 0.09 %

THDR2 ― 0.005 0.09 %

THDV1 ― 0.005 0.09 %

THDV2 ― 0.005 0.09 %

GIA1 -20 -18 -16 dB Measure : Pin 19, 20

GIA2 -20 -18 -16 dB Measure : Pin 17, 18

AE1 -2 0 2 dB Measure : Pin 19, 20

AE2 -2 0 2 dB Measure : Pin 17, 18

GIG1 4 6 8 dB

GIG2 4 6 8 dB

Measure : Pin 71, 73, 75
RL=47kΩ, Vin =0.4Vrms

Measure : Pin 72, 74, 76
RL=47kΩ, Vin =0.4Vrms

Measure : Pin 71, 73, 75
RL=47kΩ, Vin =0.4Vrms
BW=400～30kHz
Measure : Pin 72, 74, 76
RL=47kΩ, Vin =0.4Vrms
BW=400～30kHz

Measure : Pin 36, 38
BW=400～30kHz

Measure : Pin 35, 37
BW=400～30kHz

Measure : Pin 36, 38
Rg=0Ω, BW=IHF－A

Measure : Pin 35, 37
Rg=0Ω, BW=IHF－A

Measure : Pin 36, 38, 55
Vin =3Vrms

Measure : Pin 35, 37, 57
Vin =3Vrms

Measure : Pin 36, 38, 55
0 to -53dB , Vin =3Vrms

Measure : Pin 35, 37, 57
0 to -53dB , Vin =3Vrms

Measure : Pin 36, 38, 55

-54 to -103dB , Vin =3Vrms
Measure : Pin 35, 37, 57

-54 to -103dB , Vin =3Vrms
Measure : Pin 36, 38, 55

Vin =3Vrms, BW=IHF-A
Measure : Pin 35, 37, 57

Vin =3Vrms, BW=IHF-A

Measure : Pin 36, 38, 55
Vin =0.4Vrms

Measure : Pin 35, 37, 57
Vin =0.4Vrms

Measure : Pin 36, 38, 55
Vin =0.4Vrms

Measure : Pin 35, 37, 57
Vin =0.4Vrms

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© 2010 ROHM Co., Ltd. All rights reserved.

3/17

2010.06 - Rev.A

BD3811K1,BD3818KS

Treble Maximum Boost Gain
1ch

Treble Maximum Boost Gain
2ch

Treble Maximum Cut Gain
1ch

Treble Maximum Cut Gain
2ch

Treble

Treble Step Resolution 1ch TR1 ― 2 ― dB

Treble Step Resolution 2ch TR2 ― 2 ― dB

Treble Gain Setting Error 1ch TE1 -2 0 2 dB

Treble Gain Setting Error 2ch TE2 -2 0 2 dB
Bass Maximum Boost Gain

1ch
Bass Maximum Boost Gain

2ch
Bass Maximum Cut Gain 1ch GBC1 -16 -14 -12 dB

Bass Maximum Cut Gain 2ch GBC2 -16 -14 -12 dB

Bass

Bass Step Resolution 1ch BR1 ― 2 ― dB

Bass Step Resolution 2ch BR2 ― 2 ― dB

Bass Gain Setting Error 1ch BE1 -2 0 2 dB

Bass Gain Setting Error 2ch BE2 -2 0 2 dB
Bass Boost Maximum Gain

1ch
Bass Boost Maximum Gain

2ch
Bass Boost Step Resolution

1ch
Bass Boost Step Resolution

2ch

Bass Boost

Bass Boost Setting Error 1ch BBE1 -2 0 2 dB

Bass Boost Setting Error 2ch BBE2 -2 0 2 dB
Output Gain Control Range

1ch
Output Gain Control Range

2ch
Output Gain Setting Error

1ch

Output Gain

Output Gain Setting Error
2ch

* Note: This IC is not designed to be radiation-resistant.

Parameter Symbol

Limits

Min. Typ. Max.

GTB1 12 14 16 dB

GTB2 12 14 16 dB

GTC1 -16 -14 -12 dB

GTC2 -16 -14 -12 dB

GBB1 12 14 16 dB

GBB2 12 14 16 dB

GBBB1 10 12 14 dB

GBBB2 10 12 14 dB

BBR1 ― 4 ― dB

BBR2 ― 4 ― dB

GOG1 16 18 20 dB

GOG2 16 18 20 dB

GOE1 -2 0 2 dB

GOE2 -2 0 2 dB

Unit Conditions

Technical Note

Measure : Pin 55
f=15kHz, Vin =0.4Vrms

Measure : Pin 57
f=15kHz, Vin =0.4Vrms

Measure : Pin 55
f=15kHz, Vin =0.4Vrms

Measure : Pin 57
f=15kHz, Vin =0.4Vrms

Measure : Pin 55
f=15kHz, Vin =0.4Vrms

Measure : Pin 57
f=15kHz, Vin =0.4Vrms

Measure : Pin 55
f=15kHz, Vin =0.4Vrms

Measure : Pin 57
f=15kHz, Vin =0.4Vrms

Measure : Pin 55
fo=100Hz, Vin=0.4Vrms

Measure : Pin 57
fo=100Hz, Vin =0.4Vrms

Measure : Pin 55
fo=100Hz, Vin =0.4Vrms

Measure : Pin 57
fo=100Hz, Vin =0.4Vrms

Measure : Pin 55
fo=100Hz, Vin =0.4Vrms

Measure : Pin 57
fo=100Hz, Vin =0.4Vrms

Measure : Pin 55
fo=100Hz, Vin =0.4Vrms

Measure : Pin 57
fo=100Hz, Vin =0.4Vrms

Measure : Pin 55
fo=70Hz, Vin =0.4Vrms

Measure : Pin 57
fo=70Hz, Vin =0.4Vrms

Measure : Pin 55
fo=70Hz, Vin =0.4Vrms

Measure : Pin 57
fo=70Hz, Vin =0.4Vrms

Measure : Pin 55
fo=70Hz, Vin =0.4Vrms

Measure : Pin 57
fo=70Hz, Vin =0.4Vrms

Measure : Pin 36, 38, 55
Vin =0.4Vrms

Measure : Pin 35, 37, 57
Vin =0.4Vrms

Measure : Pin 36, 38, 55
Vin =0.4Vrms

Measure : Pin 35, 37, 57
Vin =0.4Vrms

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© 2010 ROHM Co., Ltd. All rights reserved.

4/17

2010.06 - Rev.A

BD3811K1,BD3818KS

2) BD3818KS (Ta=25℃ VCC=7V, VEE=-7V, f=1kHz, Vin=500mVrms, RL=10kΩ, Rg=600Ω
Input gain=0dB (FL,FR), 12.6dB (C,LS,RS), 15.6dB (SUB), Master volume=0dB, Bass and Treble =0dB,
Gain amp=0dB (C,LS,RS,SUB), C,LS and RS mixing=OFF, unless otherwise noted.)

Parameter Symbol

Limits

Min. Typ. Max.

Unit Conditions

Circuit Current IQ ― 28 40 mA No signal

Technical Note

Output Voltage Gain 1 Line GV1 3 5 7 dB

Output Voltage Gain 1 DVD GV1DVD -2 0 2 dB

Output Voltage Gain 1 DSP GV1DSP 10 12 14 dB

Output Voltage Gain 1 EXT GV1EXT -2 0 2 dB

Output Voltage Gain 2 GV2 10.6 12.6 14.6 dB

Output Voltage Gain 3 GV3 13.6 15.6 17.6 dB

Total Harmonic Distortion
Ratio 1

Total Harmonic Distortion
Ratio 2

Total Harmonic Distortion
Ratio 3

THD1 ― 0.002 0.03 %

THD2 ― 0.003 0.03 %

THD3 ― 0.003 0.03 %

Maximum Output Voltage Vomax 3.6 4.3 ― Vrms

Total Output

Residual Noise Voltage 1 V

Residual Noise Voltage 2 V

― 2.7 9 µVrms

NOR1

― 1.0 6 µVrms

NOR2

Cross-talk between Selectors CTS ― -90 -75 dB

Cross-talk between Channels
LchRch

Cross-talk between Channels
RchLch

Cross-talk between Channels
LSchRSch

Cross-talk between Channels
RSchLSch

Cross-talk between Channels
CchSUBch

Cross-talk between Channels
SUBchCch

CTCLR ― -90 -75 dB

CTCRL ― -90 -75 dB

CTCLRS ― -90 -75 dB

CTCRLS ― -90 -75 dB

CTCCSU ― -85 -70 dB

CTCSUC ― -90 -75 dB

Measure : Pin36,39
Vin =0.5Vrms, Line Mode

Measure : Pin36,39
Vin =0.5Vrms, DVD Mode

Measure : Pin36,39
Vin =0.2Vrms, DSP Mode

Measure : Pin36,39
Vin =0.5Vrms, EXT Mode

Measure : Pin 23,25,27
Vin =0.2Vrms

Measure : Pin 21
Vin =0.15Vrms

Measure : Pin36,39
BW=400～30kHz
Vin =0.5Vrms, Line Mode
Measure : Pin 23,25,27
BW=400～30kHz
Vin =0.3Vrms
Measure : Pin 21
BW=400～30kHz
Vin =0.3Vrms

Measure : Pin36,39
THD=1%

Measure : Pin36,39
Rg=0Ω,Volume= -∞
BW=IHF-A
Measure : Pin 21,23,25,27
Rg=0Ω, Volume= -∞BW=IHF-A,
Output amp=0dB

Measure : Pin36,39
Rg=0Ω, BW=IHF-A

Measure : Pin36(OUTFR)
Rg=0Ω, BW=IHF-A
Reference : Pin39(OUTFL)=1Vrms
Measure : Pin39(OUTFL)
Rg=0Ω, BW=IHF-A
Reference : Pin36(OUTFR)=1Vrms
Measure : Pin 23(OUTRS)
Rg=0Ω, BW=IHF-A
Reference :Pin 25(OUTLS) =1Vrms
Measure : Pin 25(OUTLS)
Rg=0Ω, BW=IHF-A
Reference :Pin 23(OUTRS) =1Vrms
Measure : Pin 21(OUTSUB)
Rg=0Ω, BW=IHF-A
Reference :Pin 27(OUTC) =1Vrms
Measure : Pin 27(OUTC)
Rg=0Ω, BW=IHF-A
Reference :Pin 21(OUTSUB) =1Vrms

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5/17

2010.06 - Rev.A

BD3811K1,BD3818KS

Volume Control Range VOL -97 -95 -93 dB

Volume Setting Error 1 VOLE1 -1.5 0 1.5 dB

Volume Setting Error 2 VOLE2 -2 0 2 dB

Volume Output

Maximum Attenuation VOLmin ― -115 -105 dB

Treble Maximum Boost Gain GTB 12 14 16 dB

Parameter Symbol

Limits

Min. Typ. Max.

Technical Note

Unit Conditions

Measure : Pin 21,23,25,27,
36,39
VOUT=3Vrms (VOL=0dB)
Measure : Pin 21,23,25,27,36,39
0 to -53dB,
VOUT=3Vrms (at VOL=0dB)
Measure : Pin 21,23,25,27,36,39

-54 to -95dB,
VOUT=3Vrms (at VOL=0dB)
Measure : Pin 21,23,25,27,36,39
BW=IHF-A
VOUT=3Vrms (at VOL=0dB)

Measure : Pin36,39, f=15kHz,
Vin=0.1Vrms, Line Mode

Treble Maximum Cut Gain GT C -16 -14 -12 dB

Treble

Treble Step Resolution TR ― 2 ― dB

Treble Gain Setting Error TE -2 0 2 dB

Bass Maximum Boost Gain GBB 12 14 16 dB

Bass Maximum Cut Gain GBC -16 -14 -12 dB

Bass

Bass Step Resolution BR ― 2 ― dB

Bass Gain Setting Error BE -2 0 2 dB

Input Gain Control Range 1 GIG1 7 9 11 dB

Input Gain Setting Error 1 GE1 -2 0 2 dB

Input Gain Control Range 2 GIG2 13.6 15.6 17.6 dB

Input Gain Setting Error 2 GE2 -2 0 2 dB

Input Gain

Measure : Pin36,39, f=15kHz,
Vin =0.1Vrms, Line Mode

Measure : Pin36,39, f=15kHz,
Vin =0.1Vrms, Line Mode

Measure : Pin36,39, f=15kHz,
Vin =0.1Vrms, Line Mode

Measure : Pin36,39, f=100Hz,
Vin =0.1Vrms, Line Mode

Measure : Pin36,39, f=100Hz,
Vin =0.1Vrms, Line Mode

Measure : Pin36,39, f=100Hz,
Vin =0.1Vrms, Line Mode

Measure : Pin36,39, f=100Hz,
Vin =0.1Vrms, Line Mode

Measure : Pin36,39
Vin =0.1Vrms

Measure : Pin36,39
Vin =0.1Vrms

Measure : Pin23,25,27
Vin =0.1Vrms

Measure : Pin23,25,27
Vin =0.1Vrms

Input Gain Control Range 3 GIG3 16.6 18.6 20.6 dB

Input Gain Setting Error 3 GE3 -2 0 2 dB

Gain Amp Control Range GAG 10 12 14 dB

Output Gain Setting Error GAE -2 0 2 dB

Gain Amp

Line out Voltage Gain GVLI 6 8 10 dB

Line out Total Harmonic

Line Out

Distortion Ratio

* Note: This IC is not designed to be radiation-resistant.

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THDLI ― 0.003 0.03 %

6/17

Measure : Pin21
Vin =0.1Vrms

Measure : Pin21
Vin =0.1Vrms

Measure : Pin 32
Vin =0.2Vrms

Measure : Pin 32
Vin =0.2Vrms

Measure : Pin 59,60
Vin =0.3Vrms

Measure : Pin 59,60
BW=400～30kHz, Vin =0.3Vrms

2010.06 - Rev.A