BD37544FS_15 Datasheet, PDF (1/41 Pages) Rohm – Sound Processor with Built-in 3-band Equalizer

Datasheet
Sound Processor with Built-in 3-band Equalizer
BD37544FS
General Description
BD37544FS is a sound processor with built-in 3-band
equalizer for car audio. The functions are stereo input
selector (which can switch single and GND isolation),
input-gain control, main volume, super bass, 5ch fader
volume, LPF/HPF 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,
super bass, 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 number of external components due to
built-in 3-band equalizer filter, LPF for subwoofer,
and HPF. It is possible to control Q, GV, fO of 3-band
equalizer and fC of LPF/HPF through I²C BUS
control.
 It is possible to adjust the gain of the bass, middle,
and 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:
THD+N1
THD+N2
 Maximum Input Voltage:
 Cross-talk Between Selectors:
 Volume Control Range:
 Output Noise Voltage:
VNO1
VNO2
 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.
〇Product structure : Silicon monolithic integrated circuit
.www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 14 • 001
〇This product has no designed protection against radioactive rays
1/37
TSZ02201-0C2C0E100590-1-2
16.Dec.2015 Rev.001