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

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TSZ02201-0C2C0E100450-1-2

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

TSZ22111・14・001

www.rohm.com

16.Dec.2015 Rev.001

BD37515FS

General Description

BD37515FS is a sound processor with built-in 2-band

equalizer for car audio. The functions are 4ch stereo

input

selector,

input-gain

control,

main

volume,

loudness,

and

5ch

fader volume. Moreover,

its

“Advanced switch circuit”, which is an original ROHM

technology, can reduce various switching noise (ex.

No-signal, low frequency like 20Hz & large signal

inputs).

“Advanced

switch”

makes

control

of

microcomputer easier, supporting the construction of a

high quality car audio system.

Features



Reduce switching noise of input gain control, mute,

main volume, fader volume, bass, treble, loudness

by using advanced switch circuit.



Built-in

1

differential

input

selector

and

3

single-ended input selectors



Built-in ground isolation amplifier inputs, ideal for

external stereo input.



Built-in input gain controller reduces switching

noise for volume of a portable audio input.



Decrease the number of external components due

to

built-in

2-band

equalizer

filter,

LPF

for

subwoofer, and loudness filter. Also, it is possible

to control Q, Gv, fo of 2-band equalizer, fc of LPF

control.



It is possible to adjust the gain of the bass and

treble up to ±20dB with 1 dB step gain adjustment.



It is equipped with output terminals of Subwoofer.



Energy-saving design resulting in low current

consumption, by utilizing the Bi-CMOS process. It

has the advantage in quality over scaling down the

power heat control of the internal regulators.



Input terminals and output terminals are organized

and separately laid out to keep the signal flow in

one direction which results in simpler and smaller

PCB layout.



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 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 use in car audio systems. It can also be

used for audio equipment of mini Compo, micro Compo,

TV, etc.

SSOP-A20

8.70mm x 7.80mm x 2.01mm

Datasheet

Datasheet