56F6759E soundprocessor ss(EN)

New Product Bulletin
Sound Processors for Car AV Systems
BD37033FV / BD37034FV / BD37068FV
High Fidelity + High Definition Audio
Product Outline
SSOP-B28
In recent years, with the increasing proliferation of EVs and HEVs that provide silent operation comes a
greater demand for increased fidelity in car AV equipment. ROHM sound processors utilize the most
advanced proprietary analog technology for lower noise and distortion, contributing to greater system sound
quality. In addition, advanced switching technology reduces popping noises during volume/tone adjustment,
and a special function is included that cuts unpleasant noise induced in audio equipment when receiving
phone calls (an industry first). The BD37034FV also integrates a function that prevents sound leakage during
power OFF, resulting in higher audio fidelity and definition in car AV systems.
SSOP-B40
■ Superior noise and distortion
countermeasures
Distortion Reduction
Frequency vs. Noise
1
Without
Function
-100
Before
Improvement
Before
Improvement
-110
Noise [dB]
0.1
THD+N [%]
Advanced Switching Function
Noise Reduction
Output Amplitude vs. Distortion
0.01
0.001
0.0001
0.001
■ Smooth, natural volume and tone
adjustment
With Function
M
a
g
n
i
f
i
e
d
-120
M
a
g
n
i
f
i
e
d
-130
After
Improvement
0.005
0.01
0.05
0.1 0.2
0.5
1
2
-140
After
Improvement
10
20
50
100 200
500
1k
2k
Smooth, natural volume/tone adjustment
5k 10k 20k
Frequency [Hz]
Vo [Vrms]
ROHM utilizes proprietary technology cultivated over many years to
minimize both noise and distortion in regions that cannot be reproduced
through simulation for superior sound quality.
■ Mobile phone RF noise significantly
reduced
Volume control is considered the most important function of a sound
processor. In order to achieve natural volume control, ROHM integrates
advanced switching technology to enable smooth volume adjustment
with no popping noise similar to analog methods.
■ No through-audio from external
sources (when power is OFF)
Through-Audio
Power OFF
Audio Player
Power Amp
Conventional
New
Noise reduced
by more than
10x
Conventional
New
Sound leakage
reduced by more
than 30x
Unpleasant noise can be generated when listening to music in the car a few
seconds before receiving a phone call. In response, ROHM has developed
technology that cuts noise to 1/10th or less vs. conventional levels with no
degradation in sound quality, resulting in higher fidelity playback.
A special function is also included that reduces audio leakage when
the power is OFF, decreasing through-audio from external sources by
more than 30 times when using an external power amp.
ROHM Co., Ltd.
(BD37034FV)
Sound Processor Lineup
Category Selector
Car Audio
BD349x Series
BD37033FV
BD37034FV
BD375xx Series
BD37068FV
BD346x Series
BD34701KS2
BD347x Series
Advanced Switching Function (For Reducing Popping Noise)
BD381x Series
Links with DSP for
Car Audio Applications
Links with DSP for
AV Receivers
Key Specifications (Models with Advanced Switching Function)
Recommended
Application
Car Audio
Car Audio
(DSP Link Enabled)
AV Receivers
(DSP Link Enabled)
RF Noise Pop Noise Input Source Volume
(ch)
(ch)
Reduction Reduction
Fader
(ch)
Part No.
Package
Operating Voltage
(V)
BD37033FV
SSOP-B28
7.0 to 9.5
2
6
BD37034FV
SSOP-B28
VCCL=7.0 to 9.5
VCCH=VCCL to13.0
2
6
BD37534FV
SSOP-B28
7.0 to 9.5
2
6
BD37523FS
SSOP-A24
7.0 to 9.5
2
5
BD37503FV
SSOP-B20
7.0 to 9.5
2
4
BD37068FV
SSOP-B40
VCCL=7.0 to 9.5
VCCH=VCCL to 17.0
6
BD3461FS
SSOP-A24
7.0 to 9.5
6
BD3465FV
SSOP-B20
7.0 to 9.5
4
BD34701KS2
SQFP-T52
±6.5 to ±7.5
8
BD3473KS2
SQFP-T80C
±6.5 to ±7.5
8
BD3474KS2
SQFP-T80C
±6.5 to ±7.5
6
16th December,2013.
.56F6759E 12.2013
Tone
Control
(Bands)
External
Input (ch)
High
Voltage
Output
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