○Product structure：Silicon monolithic integrated circuit ○This product has no designed protection against radioactive rays

1/35

TSZ02201-0C2C0E100550-1-2

© 2015 ROHM Co., Ltd. All rights reserved.

TSZ22111・14・001

www.rohm.com

16.Dec.2015 Rev.001

BD37534FV

General Description

BD37534FV is a sound processor with built-in 3-band

equalizer for car audio. A stereo input selector is

available that functions to switch single end input and

ground isolation input, input-gain control, main volume,

loudness, 5ch fader volume, LPF for subwoofer and

mixing input

. Moreover, “Advanced switch circuit”,

which is an original ROHM technology, can reduce

various switching noise (ex. No-signal, low frequency

like 20Hz & large signal inputs). Also,

“Advanced

switch” makes microcomputer control easier, and

constructs a high quality car audio system.

Features



Reduced switching noise of input gain control,

mute, main volume, fader volume, bass, middle,

treble, loudness by using advanced switch circuit



Built-in differential input selector that can make

various combination of single-ended / differential

input.



Built-in ground isolation amplifier inputs, which is

ideal for external stereo input.



Built-in input gain controller

reduces

volume

switching noise of a portable audio input.



Decreased number of external components due to

built-in 3-band equalizer filter, LPF for subwoofer

and loudness filter. It is possible to freely control

the Q, Gv, fo of the 3-band equalizer and fc of the

control



A gain adjustment quantity of ±20dB with a 1 dB

step gain adjustment is possible for the bass,

middle and treble.



Equipped with terminals for the subwoofer outputs.

Also, the audio signal outputs of the front, rear

control.



Built-in mixing input and mixing attenuator.



Energy-saving design resulting in low current

consumption is achieved by utilizing the BiCMOS

process. It has the advantage of quality over

scaling down the power heat control of the

internal regulators..



Input pins and output pins are organized and

separately laid out to keep the signal flow in one

direction. This consequently simplifies the pattern

layout of the set board and decreases the board

dimensions.



Applications

It is optimal for car audio systems. It can also be used

for audio equipment of mini Compo, micro Compo, TV,

etc.

Key Specifications



Power Supply Voltage Range:

7.0V to 9.5V



Circuit Current (No Signal):

38mA(Typ)



Total Harmonic Distortion 1:

(FRONT,REAR)

0.001%(Typ)



Total Harmonic Distortion 2:

(SUBWOOFER)

0.002%(Typ)



Maximum Input Voltage:

2.3Vrms (Typ)



Cross-talk Between Selectors:

-100dB (Typ)



Volume Control Range:

+15dB to -79dB



Output Noise Voltage 1:

(FRONT,REAR)

3.8µVrms(Typ)



Output Noise Voltage 2:

(SUBWOOFER)

4.8µVrms(Typ)



Residual Output Noise Voltage:

1.8µVrms (Typ)



Operating Temperature Range:

-40°C to +85°C

Package

W(Typ) x D(Typ) x H(Max)

SSOP-B28

10.0mm x 7.60mm x 1.35mm

Datasheet

Datasheet