BD37542FS_15 Datasheet, PDF (1/37 Pages) Rohm – Sound Processor with Built-in 3-band Equalizer

Datasheet
Sound Processor with Built-in 3-band Equalizer
BD37542FS
General Description
BD37542FS is a sound processor with built-in 3-band
equalizer for car audio. The functions are stereo input
selector (which can switch single 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
control of microcomputer easier, and can construct a
high quality car audio system.
Features
 Reduced switching noise of input gain control,
mute, main volume, fader volume, bass, middle,
treble, loudness, mixing 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 switching
noise for volume of a portable audio input.
 Decreased the number of external components
due to built-in 3-band equalizer filter, LPF for
subwoofer. It is possible to control Q, GV, fO of
3-band equalizer, fC of LPF, and GV of loudness by
I²C BUS control.
 It is possible to adjust the gain of the bass, middle,
treble up to ±20dB with 1 dB step gain adjustment.
 It is equipped with output terminals for Subwoofer.
Moreover, the stereo signal output of the front and
rear can also be chosen by the I²C BUS control.
 Built-in mixing input and mixing attenuator.
 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 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.
 It is possible to control the I²C BUS by 3.3V / 5V.
Key Specifications
 Power Supply Voltage Range:
 Circuit Current (No Signal):
 Total Harmonic Distortion 1:
(FRONT,REAR)
 Total Harmonic Distortion 2:
(SUBWOOFER)
 Maximum Input Voltage:
 Cross-talk Between Selectors:
 Volume Control Range:
 Output Noise Voltage 1:
(FRONT,REAR)
 Output Noise Voltage 2:
(SUBWOOFER)
 Residual Output Noise Voltage:
 Operating Temperature Range:
7.0V to 9.5V
38mA(Typ)
0.001%(Typ)
0.002%(Typ)
2.3Vrms (Typ)
-100dB (Typ)
+15 dB to -79dB
3.8µVrms(Typ)
4.8µVrms(Typ)
1.8µVrms(Typ)
-40°C to +85°C
Package
W(Typ) x D(Typ) x H(Max)
SSOP-A32
13.60 mm x 7.80mm x 2.01mm
Applications
It is optimal for car audio systems. It can also be used
for audio equipment of mini Compo, micro Compo, TV,
etc.
○Product structure：Silicon monolithic integrated circuit
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product has no designed protection against radioactive rays
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TSZ02201-0C2C0E100570-1-2
16.Dec.2015 Rev.001