ROHM BD3433K Technical data
Sound Processor Series for Car Audio
6ch Electronic Volume
for 5.1ch Car Theater
BD3433K
No.10085EAT01
●Description
The 6ch electronic volume for 5.1ch car theater is an electronic volume device incorporating 6ch input se lector (front/rear
independently-controlled), input gain amp (front/rear independently-controlled), 6ch independently-controlled electronic
volume (capable of soft switching), 6ch output gain amp (2-line outputs), differential input for monophonic signals, electronic
volume for monophonic signals (capable of soft switching), and mixing circuit for monophonic signals. It is provided with
the high performance functions to achieve low distortion and low noise and, furthermore, to output the 5.6Vrms high voltage.
The QFP44 package which realizes savings in space and components is used to be suited for applications such as car
audio and car navigation.
●Features
1) High voltage output of 5.6Vrms achieved
Provided with 2 lines of outputs to the built-in power amp and the pre-out
2) Volume switching noise is reduced by installing the advanced 6ch independently-controlled electronic volume
with soft switching.
3) High performance capabilities such as low distortion rate (0.001%), low noise (3µVrms)
4) Different signals from the different sources can be outputted to the front and rear sections
independently and this provides an option of rear-seat entertainment.
5) Incorporate the monophonic differential input circuit suited for inputting navigation voice and telephone speech.
These monophonic voices can be mixed with the front output signals.
6) Adopting the Bi-CMOS process achieves low current consumption, which contributes to energy-saving design.
It has the advantage in quality over scaling down and heat reduction of the internal regulators.
7) 3-wire serial interface supported for both of 3.3V and 5V microcomputers
●Applications
For car audio equipment, car navigation equipment, and hybrid systems.
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© 2010 ROHM Co., Ltd. All rights reserved.
2010.03 - Rev.A
BD3433K
●Absolute maximum ratings(Ta=25C)
Item Symbol Terminal Rating Unit
VCC-GND ※1 10
Terminal applied voltage
VEE-GND ※1 -10
VLGC Control terminal （CS/SCK/SDA）※15.5
Power dissipation Pd
※2
Operating Temperature Topr -40 ～ +85 ℃
Storage Temperature Tastg -55 ～ +125 ℃
※1：Maximum applied voltage based on GND.
※2：Derating is done 8.5mW/℃ for Ta＞25℃.
Mounted on (Material: FR4 glass epoxy board (beaten-copper area <3%), size:70mm×70mm×1.6mm)
※3：No radiation-proof design
●Operating conditions（Operating condition at Ta=25℃）
Item Symbol Terminal Condition MIN TYP MAX Unit
Operating power supply voltage
※1： When it is within operating temperature, basic circuit function is guaranteed within operating voltage. However, setting
constant and element, voltage setting, and temperature setting are required when in operation. Other than the condition
stipulated within the range, the standard value of electrical characteristics could not be guaranteed, while original function is
retained.
VCC VCC-GND
VEE VEE-GND -9.5 -9 -7.0 V
●Electrical characteristics
Abbreviations：
“Giaj”：Setting value of Input gain adjustor “Vol”：Setting value of volume (1～6ch)
“Vol.Ex”：Setting value of volume for monaural signal “Goaja”：Setting value of output gain adjustor A
“Goajb”：Setting value of output gain adjustor B “Mix”：ON/OFF setting for mixing switch.
Measurement condition (Unless specified particularly) ：
Ta＝25℃, VCC=9V, VEE=-9V, Vin=1Vrms/1kHz, Load resistance=10kΩ, Load capacitance=10pF,
Giaj＝0dB, Vol=0dB, Goaja=0dB, Goajb=0dB, Vol.Ex=-∞dB, Mix=OFF
■ General characteristics
Item Symbol Condition MIN TYP MAX Unit
Current consumption
ICC
IEE -17 -9 -
VCO oscillation frequency Fvco - 400 - kHz
RRc
Ripple rejection
RRe
Reset operation voltage VRS
Required time
for Power on reset
TPOR
Ripple = 0.1Vrms/ 1kHz
(Input terminal AC short)
Ripple= 0.1Vrms/ 1kHz
(Input terminal AC short)
Initialize all register data by
Vcc＜VRS → Vcc＞VRS
Minimum required time to reach
3V after Vcc voltage ON.
※1
Technical Note
V
850 mW
7.0 9 9.5 V
- 10 17
40 85 - dB
30 70 - dB
- 3.4 - V
20 - - µsec
mA
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© 2010 ROHM Co., Ltd. All rights reserved.
2010.03 - Rev.A
BD3433K
■ Logic circuit
“H” level input voltage VIH CS, SCK, SDA 2.3 - 5.5 V
“L” level input voltage
Input clock frequency f
■ Volume circuit
Voltage gain GV -1 0 1 dB
Bandwidth FW
Slew rate SR - 1.65 - V/µsec
Maximum input voltage VIM THD+N = 1% , Vol = -10dB 3.8 4.25 - Vrms
Maximum output voltage
Input impedance RI 70k 100k 130k Ω
Output impedance RO - - 50
Input gain
setting value error
Volume
setting value error
Volume
maximum attenuation
Output gain
setting value error
Gain balance
between channels
Cross-talk
between channels
Output noise voltage VNO
Residual output
noise voltage
THD+N THD
Soft switching
transition time
Technical Note
Item Symbol Terminal MIN TYP MAX Unit
VIL CS, SCK, SDA 0 - 1.0 V
SCK - - 1.5 MHz
SCK
Item Symbol Condition MIN TYP MAX Unit
Frequency, which drop -1dB towards
1kHz
VOM1
VOM3 Goajb=-4.5dB 2.2 2.5 -
THD+N = 1%
Vol = +10dB
Output reference is Giaj=0dB
EGI
Giaj=6, 12 dB, Vin=0.1Vrms
3.8 4.25 -
Vol=+23～+1, -1～-20dB
EV1
(+23～+1dB
at Vin=0.1Vrms)
EV2 Vol=-21～-40dB -1.5 0 1.5
EV3 Vol=-41～-60dB -2.0 0 2.0
EV4
Output
Vol=0dB
standard
Vol=-61～-79dB
VMU Vol=-∞dB (mute) , BW=20～20kHz - -108 -85 dB
EGOA
EGOB
CB
CTC
Goaja=
BW=20～20kHz
(Input terminal AC short)
BW=A-Weight
(Input terminal AC short)
VNR Vol=-∞dB - 2 10
Goaja=+2.5dB
Output
standard
Goajb=-4.5dB
Goajb=0dB
Vol=0dB - 2.5 10
BW=20～20kHz, Vout=1Vrms
Tss1
Tss2 1.28 msec/dB - 1.28 -
Soft switching:ON
Tss3 2.56 msec/dB - 2.56 -
0.64 msec/dB - 0.64 -
Tss4 5.12 msec/dB - 5.12 -
100 - - kHz
VrmsVOM2 Goaja=+2.5dB 5 5.6 -
Ω
-1 0 1 dB
-1.0 0 1.0
dB
-3.0 0 3.0
-1 0 1
dB
-1 0 1
-1 0 1 dB
85 106 - dB
µVrms
- 0.001 0.05 %
msec
/dB
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© 2010 ROHM Co., Ltd. All rights reserved.
2010.03 - Rev.A
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