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

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TSZ02201-0C2C0E100490-1-2

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

TSZ22111・14・001

www.rohm.com

16.Dec.2015 Rev.001

BD37524FS

General Description

BD37524FS is a sound processor with built-in 3-band

equalizer for car audio. Other features are stereo 5ch

input

selector,

input-gain

control,

main

volume,

loudness, 5ch fader volume, LPF for subwoofer, level

meter. It is equipped with an

“Advanced switch circuit”,

which is an original ROHM technology that reduces

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

likes 20Hz & large signal inputs). The

“Advanced

switch” makes control of microcomputer easier and can

be used for designing high quality car audio systems.

Features



Reduced switching noise of input gain control,

mute, main volume, fader volume, bass, treble,

and loudness by using advanced switch circuit



Built-in

differential

input

selector

and

4

single-ended input selectors



Built-in ground isolation amplifier inputs, which is

ideal for external stereo input.



Built-in input gain controller reduces switching

noise for volume of a portable audio input.



Lesser number of external components due to

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

loudness filter. This makes,it possible to control

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



A gain adjustment quantity of ±20dB with 1 dB

step gain adjustment is possible for bass, middle,

and treble.



Built-in subwoofer output terminals.



Energy-saving design resulting in low current

consumption is achieved by utilizing the Bi-CMOS

process. It has the advantage in 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 which consequently, simplify pattern

layout of the set board and decrease the board

dimensions. .



BUS

Key Specifications



Power Supply Voltage Range:

7.0V to 9.5V



Circuit Current (No Signal):

38mA(Typ)



Total Harmonic Distortion1

(FRONT,REAR):

0.001%(Typ)



Total Harmonic Distortion2

(SUBWOOFER):

0.002%(Typ)



Maximum Input Voltage:

2.3Vrms(Typ)



Cross-talk Between Selectors:

-100dB(Typ)



Volume Control Range:

+15dB to -79dB



Output Noise Voltage1

(FRONT,REAR):

3.8µVrms(Typ)



Output Noise Voltage2

(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)

Applications

It is optimal for car audio systems. It is also suitable for

other audio equipment such as mini Compo, micro

Compo, TV etc

SSOP-A24

10.00mm x 7.80mm x 2.10mm

Datasheet

Datasheet