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PDF BD37521FS Data sheet ( Hoja de datos )
| Número de pieza | BD37521FS | |
| Descripción | Sound Processor | |
| Fabricantes | ROHM Semiconductor | |
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Datasheet
Sound Processor with Built-in 2-band Equalizer
BD37521FS
General Description
BD37521FS is a sound processor with built-in 2-band
equalizer for car audio. Other features are stereo 4ch input
selector, input-gain control, main volume, loudness, and a
4ch fader volume. It is equipped with an “Advanced switch
circuit”, which is an original ROHM technology that
reduces various switching noise (ex. No-signal, low
frequency such as 20Hz & large signal inputs). Also, this
“Advanced switch” makes control of microcomputer easier
and can be used for designing high quality car audio
system.
Features
Reduced switching noise of input gain control, mute,
main volume, fader volume, bass, treble, and
loudness by using advanced switch circuit.
Built-in 1 differential input selector and 3 single-ended
input selectors
Built-in ground isolation amplifier inputs which is ideal
for external stereo input.
Built-in input gain controller which reduces switching
noise for volume of a portable audio input.
Lesser number of external components due to built-in
2-band equalizer filter. This makes it possible to
control the Gv of 2-band equalizer and Gv of loudness
by I2C BUS.
A gain adjustment quantity of ±20dB with a 1 dB step
gain adjustment is possible for the bass and treble.
Energy-saving design resulting in low current
consumption is achieved by utilizing the BiCMOS
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 that consequently simplify pattern layout of
the set board and decrease the board dimensions.
It is possible to be controlled by a 3.3V / 5V I2C BUS .
Key Specifications
Power Supply Voltage Range:
Circuit Current (No Signal):
Total Harmonic Distortion:
Maximum Input Voltage:
Cross-talk Between Selectors:
Volume Control Range:
Output Noise Voltage:
Residual Output Noise Voltage:
Operating Temperature Range:
7.0V to 9.5V
38mA(Typ)
0.001%(Typ)
2.3Vrms (Typ)
-100dB (Typ)
+15dB to -79dB
3.8µVrms(Typ)
1.8µVrms (Typ)
-40°C to +85°C
Package
W(Typ) x D(Typ) x H(Max)
SSOP-A24
10.00mm x 7.80mm x 2.10mm
Applications
It is best suited for car audio applications. It is also suitable
for other audio equipment such as mini-component,
micro-component, television, 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
1/27
TSZ02201-0C2C0E100460-1-2
16.Dec.2015 Rev.001
1 page  
BD37521FS
Electrical Characteristics – continued
Parameter
Symbol
Min
Minimum Input Gain
GIN_MIN
-2
Maximum Input Gain
Gain Set Error
Mute Attenuation＊
GIN_MAX
GIN_ERR
GMUTE
18
-2
－
Maximum Gain
GV MAX
13
Maximum Attenuation＊
Attenuation Set Error 1
GV MIN
GV_ERR1
－
-2
Limit
Typ
Max
0 +2
20 22
0 +2
-105 -85
15 17
-100 -85
0 +2
Unit Conditions
Input gain 0dB
dB VIN=100mVrms
GIN=20log(VOUT/VIN)
Input gain 20dB
dB VIN=100mVrms
GIN=20log(VOUT/VIN)
dB GAIN=+20dB to +1dB
Mute ON
dB GMUTE=20log(VOUT/VIN)
BW = IHF-A
Volume = 15dB
dB VIN=100mVrms
GV=20log(VOUT/VIN)
Volume = -∞dB
dB GV=20log(VOUT/VIN)
BW = IHF-A
dB GAIN & ATT=+15dB to -15dB
Attenuation Set Error 2
GV_ERR2
-3
0
+3 dB ATT=-16dB to -47dB
Attenuation Set Error 3
Maximum Boost Gain
Maximum Cut Gain
Gain Set Error
Maximum Boost Gain
Maximum Cut Gain
Gain Set Error
Maximum Attenuation＊
Attenuation Set Error 1
GV_ERR3
-4
0
+4
GB_BST
18
20
22
GB_CUT
-22
-20
-18
GB_ERR
-2
0
+2
GT_BST
17
20
23
GT_CUT
-23
-20
-17
GT_ERR
-2
0
+2
GF_MIN － -100 -90
GF_ERR1
-2
0
+2
dB ATT=-48dB to -79dB
Gain=+20dB fo=100Hz
dB VIN=100mVrms
GB=20log (VOUT/VIN)
Gain=-20dB fo=100Hz
dB VIN=2Vrms
GB=20log (VOUT/VIN)
dB
Gain=+20dB to -20dB
fo=100Hz
Gain=+20dB fo=10kHz
dB VIN=100mVrms
GT=20log (VOUT/VIN)
Gain=-20dB fo=10kHz
dB VIN=2Vrms
GT=20log (VOUT/VIN)
dB
Gain=+20dB to -20dB
fo=10kHz
Fader = -∞dB
dB GF=20log(VOUT/VIN)
BW = IHF-A
dB ATT=-1dB to -15dB
Attenuation Set Error 2
GF_ERR2
-3
0
+3 dB ATT=-16dB to -47dB
Attenuation Set Error 3
GF_ERR3
-4
0
+4 dB ATT=-48dB to -79dB
Output Impedance
ROUT - － 50 Ω VIN=100mVrms
Maximum Output Voltage
Maximum Gain
VOM
2
2.2
－
Vrms
THD+N=1%
BW=400Hz to 30KHz
Gain 20dB
GL_MAX
17
20
23
dB VIN=100mVrms
GL=20log(VOUT/VIN)
Gain Set Error
GL_ERR
-2
0
+2 dB Gain=+20dB to +1dB
VP-9690A (Average value detection, effective value display) filter by Matsushita Communication is used for * measurement.
Phase between input / output is same.
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/27
TSZ02201-0C2C0E100460-1-2
16.Dec.2015 Rev.001
5 Page 
BD37521FS
(5)Select Address & Data
Items
Initial setup 1
Initial setup 2
Select MSB
Data
Address
(hex)
D7
D6
D5
D4
D3
Advanced
Advanced switch time
01 switch
0 of Input Gain/Volume 0
ON/OFF
Tone/Fader/Loudness
02 0 0 0 0 0
LSB
D2 D1 D0
0
Advanced switch time
of Mute
000
Initial setup 3
03 0
0
0
1
0
0
1
0
Input Selector
Input gain
Volume gain
05 0
06
Mute
ON/OFF
20
0
0
0 Input selector
0 Input Gain
Volume Gain / Attenuation
Fader 1ch Front
28
Fader Attenuation
Fader 2ch Front
29
Fader Attenuation
Fader 1ch Rear
2A
Fader Attenuation
Fader 2ch Rear
2B
Fader Attenuation
Test mode 1 2C 1 1 1 1 1 1 1 1
Test mode 2 41 0 0 1 0 0 0 0 1
Test mode 3 44 0 0 0 0 0 0 0 0
Test mode 4 47 0 0 0 1 0 0 0 1
Bass gain
51
Bass
Boost/Cut
0
0
Bass Gain
Test mode 5 54 1 0 0 0 0 0 0 0
Treble gain
57
Treble
Boost/Cut
0
0
Treble Gain
Loudness Gain
75
0
0
0
Loudness Gain
System Reset FE 1 0 0 0 0 0 0 1
Note
Advanced switch
1. The advance switch works in the latch part while changing from one function to another.
2. Upon continuous data transfer, the Select Address rolls back to the first address on automatic increment function, as
shown below.
→01 → 02 → 03 → 05 → 06 → 20 → 28 → 29 → 2A → 2B → 2C
→ 41 → 44 → 47 → 51 → 54 → 57 →7 5
3. Advanced switch is not used for the function of input selector etc. Therefore, please turn on MUTE when changing the
settings of this side of a set.
4. When using Mute function when changing input selector, please switch Mute ON/OFF for waiting advanced-mute time.
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/27
TSZ02201-0C2C0E100460-1-2
16.Dec.2015 Rev.001
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet BD37521FS.PDF ] | |
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