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Datasheet
Sound Processor with Built-in 3-band Equalizer
BD37524FS
General Description
Key Specifications
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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.
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Features
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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
Gv of loudness through I2C BUS.
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. .
It is possible to be controlled by a 3.3V / 5V I2C
BUS
○Product structure：Silicon monolithic integrated circuit
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© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001

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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)
1.8µVrms(Typ)
Residual Output Noise Voltage:
Operating Temperature Range:
-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 optimal for car audio systems. It is also suitable for
other audio equipment such as mini Compo, micro
Compo, TV etc
○This product has no designed protection against radioactive rays
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TSZ02201-0C2C0E100490-1-2
16.Dec.2015 Rev.001
BD37524FS
Typical Application Circuit
BD37524FS
Pin Configuration
TOP VIEW
FIL 1
24
A1
2
23 SDA
A2
3
22 SCL
B1
4
21 VCC
B2
5
20
OUTF1
CP1
6
19
OUTF2
CN
7
18
OUTR1
17
OUTR2
9
16
OUTS1
10
15
OUTS2
E1
11
14
LOUT
E2
12
13
MUTE
CP2 8
D1
D2
GND
Pin Descriptions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
Pin Name
FIL
A1
A2
B1
B2
CP1
CN
CP2
D1
D2
E1
E2
Description
VCC/2 terminal
A input terminal of 1ch
A input terminal of 2ch
B input terminal of 1ch
B input terminal of 2ch
C positive input terminal of 1ch
C negative input terminal
C positive input terminal of 2ch
D input terminal of 1ch
D input terminal of 2ch
E input terminal of 1ch
E input terminal of 2ch
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© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
Pin No.
13
14
15
16
17
18
19
20
21
22
23
24
2/31
Pin Name
MUTE
LOUT
OUTS2
OUTS1
OUTR2
OUTR1
OUTF2
OUTF1
VCC
SCL
SDA
GND
Description
External compulsory mute terminal
Output terminal for Level meter
Subwoofer output terminal of 2ch
Subwoofer output terminal of 1ch
Rear output terminal of 2ch
Rear output terminal of 1ch
Front output terminal of 2ch
Front output terminal of 1ch
Power supply terminal
I2C Communication clock terminal
I2C Communication data terminal
GND terminal
TSZ02201-0C2C0E100490-1-2
16.Dec.2015 Rev.001
BD37524FS
Block Diagram
18
17
Fader★
13
14
15
16
19
Fader★
20
21
22
23
Fader★
24
VCC
GND
I2C BUS LOGIC
Fader★
Fader★
■Fader
Fader
Gain:+15dB to -79dB/1dB step
step
Gain:+15dB～-79ｄB/1dB
★no pop noise
■LPF
fc=55/85/120/160Hz
■Loudness
Loudness
Gain: 20dB to 0dB/1dB step
step
Gain:20dB～0ｄB/1ｄB
★no pop noise
・ｆ0=250/400/800Hz
・Hicut:1/2/3/4
■3 Band P-EQ (Tone control)
Gain：+20dB～-20dB/1dB
Gain: +20dB to -20dB/1dB step
★no pop noise
・Bass：f0=60/80/100/120Hz
Q=0.5/1.0/1.5/2.0
・Meddle:f0=500/1k/1.5k/2.5kHz
Q=0.75/1/1.25/1.5
・Treble：f0=7.5k/10k/12.5k/15kHz
Q=0.75/1.25
■Volume
Gain: +15dB to -79dB/1dB step
step
Gain：+15dB～-79dB/1dB
★no pop noise
■Input Gain
Gain: +20dB to 0dB/1dB step
step
Gain：+20dB～0dB/1dB
★no pop noise
LPF
★Loudness
★3 Band P-EQ
(Tone control)
★Volume/Mute
Level
meter
★Input Gain
Input selector (4 single-end and 1 stereo ISO)
GND
ISO amp
GND
ISO amp
VCC/2
1
2
3
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© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
4
5
6
7
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8
9
10
250k
250k
250k
250k
250k
250k
250k
100k
100k
100k
100k
11
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TSZ02201-0C2C0E100490-1-2
16.Dec.2015 Rev.001
BD37524FS
Absolute Maximum Ratings (Ta=25°C)
Parameter
Symbol
Power supply Voltage
Input voltage
Power Dissipation
Rating
Unit
VCC
10.0
V
VIN
VCC+0.3 to GND-0.3
V
Pd
Storage Temperature
1
Tstg
(Note 1)
W
-55 to +150
°C
(Note 1) When mounted on standard board (70 x 70 x 1.6(mm3)), derate by 8mW/°C for Ta above25°C.
Thermal resistance θja = 125(°C/W)
Material : A FR4 grass epoxy board(3% or less of copper foil area)
Caution: Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit
between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over
the absolute maximum ratings.
Recommended Operating Conditions
Parameter
Symbol
Min
Typ
Max
Unit
Power Supply Voltage
VCC
7.0
－
9.5
V
Temperature
Topr
-40
－
+85
°C
Electrical Characteristics
GENERAL
BLOCK
(Unless otherwise noted, Ta=25°C, VCC=8.5V, f=1kHz, VIN =1Vrms, Rg=600Ω, RL=10kΩ, A1 input, Input gain 0dB,
Mute OFF, Volume 0dB, Tone control 0dB, Loudness 0dB, LPF OFF, Fader 0dB)
Limit
Parameter
Symbol
Unit
Conditions
Min
Typ
Max
Circuit Current (No Signal)
IQ
－
38
48
mA
No signal
Voltage Gain
GV
-1.5
0
+1.5
dB
GV=20log(VOUT/VIN)
Channel Balance
Total Harmonic Distortion 1
(FRONT,REAR)
Total Harmonic Distortion 2
(SUBWOOFER)
Output Noise Voltage 1
(FRONT,REAR) *
Output Noise Voltage 2
(SUBWOOFER) *
CB
-1.5
0
+1.5
dB
THD+N1
－
0.001
0.05
％
THD+N2
－
0.002
0.05
％
VNO1
－
3.8
15
μVrms
VNO2
－
4.8
15
μVrms
Residual Output Noise Voltage *
VNOR
－
1.8
10
μVrms
Crosstalk Between Channels *
CTC
－
-100
-90
dB
RR
－
-70
-40
dB
CB = GV1-GV2
VOUT=1Vrms
BW=400Hz-30KHz
VOUT=1Vrms
BW=400Hz-30KHz
Rg = 0Ω
BW = IHF-A
Rg = 0Ω
BW = IHF-A
Fader = -∞dB
Rg = 0Ω
BW = IHF-A
Rg = 0Ω
CTC=20log(VOUT/VIN)
BW = IHF-A
f=1KHz
VRR=100mVrms
RR=20log(VCC IN/VOUT)
INPUT GAIN
INPUT SELECTOR
Ripple Rejection
Input Impedance(A, B)
RIN_S
70
100
130
kΩ
Input Impedance (C,D,E)
RIN_D
175
250
325
kΩ
Maximum Input Voltage
VIM
2.1
2.3
－
Vrms
Crosstalk Between Selectors *
CTS
－
-100
-90
dB
Common Mode Rejection Ratio *
CMRR
50
65
－
dB
Minimum Input Gain
GIN_MIN
-2
0
+2
dB
Maximum Input Gain
GIN_MAX
18
20
22
dB
Gain Set Error
GIN_ERR
-2
0
+2
dB
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TSZ22111・15・001
4/31
VIM at THD+N(VOUT)=1％
BW=400Hz-30KHz
Rg = 0Ω
CTS=20log(VOUT/VIN)
BW = IHF-A
CP1 and CN input
CP2 and CN input
CMRR=20log(VIN/VOUT)
BW = IHF-A
Input gain 0dB
VIN=100mVrms
GIN=20log(VOUT/VIN)
Input gain 20dB
VIN=100mVrms
GIN=20log(VOUT/VIN)
GAIN=+20dB to +1dB
TSZ02201-0C2C0E100490-1-2
16.Dec.2015 Rev.001
BD37524FS
Level
meter
LOUDNESS
FADER / SUBWOOFER
TREBLE
MIDDLE
BASS
VOLUME
MUTE
BLOCK
Electrical Characteristics - continued
Limit
Parameter
Symbol
Min
Typ
Max
Unit
Conditions
Mute ON
GMUTE=20log(VOUT/VIN)
BW = IHF-A
Mute Attenuation *
GMUTE
－
-105
-85
dB
Maximum Gain
GV_MAX
13
15
17
dB
Maximum Attenuation *
GV_MIN
－
-100
-85
dB
Attenuation Set Error 1
GV_ERR1
-2
0
+2
dB
Volume = 15dB
VIN=100mVrms
GV=20log(VOUT/VIN)
Volume = -∞dB
GV=20log(VOUT/VIN)
BW = IHF-A
GAIN & ATT=+15dB to -15dB
Attenuation Set Error 2
GV_ERR2
-3
0
+3
dB
ATT=-16dB to -47dB
Attenuation Set Error 3
GV_ERR3
-4
0
+4
dB
Maximum Boost Gain
GB_BST
18
20
22
dB
Maximum Cut Gain
GB_CUT
-22
-20
-18
dB
Gain Set Error
GB_ERR
-2
0
+2
dB
Maximum Boost Gain
GM_BST
18
20
22
dB
Maximum Cut Gain
GM_CUT
-22
-20
-18
dB
Gain Set Error
GM_ERR
-2
0
+2
dB
Maximum Boost Gain
GT_BST
18
20
22
dB
Maximum Cut Gain
GT_CUT
-22
-20
-18
dB
Gain Set Error
GT_ERR
-2
0
+2
dB
ATT=-48dB to -79dB
Gain=+20dB f=100Hz
VIN=100mVrms
GB=20log (VOUT/VIN)
Gain=-20dB f=100Hz
VIN=2Vrms
GB=20log (VOUT/VIN)
Gain=+20dB to -20dB f=100Hz
gain=+20dB f=1KHz
VIN=100mVrms
GM=20log (VOUT/VIN)
Gain=-20dB f=1KHz
VIN=2Vrms
GM=20log (VOUT/VIN)
Gain=+20dB to -20dB f=1KHz
Gain=+20dB f=10kHz
VIN=100mVrms
GT=20log (VOUT/VIN)
Gain=-20dB f=10kHz
VIN=2Vrms
GT=20log (VOUT/VIN)
Gain=+20dB to -20dB f=10kHz
Maximum Boost Gain
GF_BST
13
15
17
dB
Maximum Attenuation＊
GF_MIN
－
-100
-90
dB
Gain Set Error
GF_ERR
-2
0
+2
dB
Fader=15dB
VIN=100mVrms
GF=20log(VOUT/VIN)
Fader = -∞dB
GF=20log(VOUT/VIN)
BW = IHF-A
Gain=+15dB to +1dB
Attenuation Set Error 1
GF_ERR1
-2
0
+2
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
VOM
2
2.2
－
Vrms
Maximum Gain
GL_MAX
17
20
23
dB
Gain Set Error
GL_ERR
-2
0
+2
dB
Maximum Output Voltage
VL_MAX
2.8
3.1
3.5
V
VL_OFF
－
0
100
mV
Output Offset Voltage
THD+N=1%
BW=400Hz-30KHz
Gain 20dB
VIN=100mVrms
GL=20log(VOUT/VIN)
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.
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TSZ22111・15・001
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TSZ02201-0C2C0E100490-1-2
16.Dec.2015 Rev.001
BD37524FS
Typical Performance Curves
10
20
10
0
0
2
4
6
8
0.1
0.1
0.01
0.01
0.001
0.01
VCC[V]
Power Supply Voltage : VCC [V]
Figure 2. THD+N vs Output Voltage
4
Gain=0dB
1
Gain [dB]
Gain (dB)
3
0
-1
-2
-3
-4
10
100
1k
10k
100k
Frequency [Hz]
25
20
15
10
5
BASS GAIN : -20dB to +20dB
/1dB step
fo : 60Hz Q : 0.5
0
-5
-10
-15
-20
-25
10
100
1k
10k
100k
Frequency [Hz]
Figure 3. Gain vs Frequency
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© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
10
Vout (V)
5
-5
1
Output Voltage : VOUT [Vrms]
Figure 1. Circuit Current (No Signal) vs Power
Supply Voltage
2
0.1
Figure 4. Bass Gain vs Frequency
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TSZ02201-0C2C0E100490-1-2
16.Dec.2015 Rev.001
Vout
1kHz
100Hz
0.001
0.001
10
1
10kHz
VIN [Vrms]
30
10
1
THD+N [%]
THD+N (%)
40
Iq[mA]
Circuit Current (No Signal) : IQ [mA]
50
BD37524FS
Typical Performance Curves – continued
25
fo : 60/80/100/120Hz
BASS GAIN : ±20dB
Q : 0.5
20
15
Gain [dB]
Gain [dB]
10
5
0
-5
-10
-15
-20
-25
10
100
1k
10k
25
20
15
10
5
Q : 0.5/1/1.5/2
BASS GAIN : ±20dB
fo : 60Hz
0
-5
-10
-15
-20
-25
100k
10
Frequency [Hz]
Gain [dB]
Gain [dB]
Gain[dB]
fo : 500Hz
Q : 0.75
100
1k
10k
100k
Figure 6. Bass Q vs Frequency
MIDDLE GAIN :
-20dB to +20dB /1dB step
10
1k
Frequency [Hz]
Figure 5. Bass fo vs Frequency
25
20
15
10
5
0
-5
-10
-15
-20
-25
100
10k
100k
25
20
15
10
5
fo : 500/1k/1.5k/2.5kHz
0
-5
-10
-15
-20
-25
10
Frequency [Hz]
100
1k
10k
100k
Frequency [Hz]
Figure 8. Middle fo vs Frequency
Figure 7. Middle Gain vs Frequency
Figure 7 .Middle Gain vs Freq
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TSZ22111・15・001
7/31
TSZ02201-0C2C0E100490-1-2
16.Dec.2015 Rev.001
BD37524FS
Typical Performance Curves – continued
25
25
20
Gain (dB)
Gain [dB]
10
5
0
-5
Gain [dB]
15
-10
MIDDLE GAIN :
±20dB
fo : 1kHz
-15
1k
10k
5
0
-5
-10
-20
-25
-25
100
15
10
-15
-20
10
TREBLE GAIN:-20dB to +20dB
/1dB step
fo : 7.5kHz Q : 0.75
20
Q : 0.75/1/1.25/1.5
100k
10
Frequency [Hz]
100
1k
10k
100k
Frequency [Hz]
Figure 10.
Treble Gain (Hz)
vs Frequency
Frequency
Figure 9. Middle Q vs Frequency
25
fo : 7.5k/10k/12.5k/15kHz
TREBLE GAIN : ±20dB
Q : 0.75
20
15
Q : 0.75/1.25
TREBLE GAIN : ±20dB
fo : 7.5kHz
20
15
Gain (dB)
0
-5
Gain [dB]
10
10
5
Gain[dB]
Output Noise [µVrms]
25
5
0
-10
-5
-10
-15
-15
-20
-20
-25
-25
10
100
1k
10k
10
100k
100
1k
10k
100k
Frequency (Hz)
Frequency [Hz]
Frequency (Hz)
Figure 11. Treble fo vs Frequency
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© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
Figure 12. Treble Q vs Frequency
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TSZ02201-0C2C0E100490-1-2
16.Dec.2015 Rev.001
BD37524FS
Typical Performance Curves – continued
1000
Din-Audio
出力雑音電圧
[uVrms]
Output Noise [µVrms]
出力雑音電圧[uVrms]
Output Noise [µVrms]
1000
IHF-A
100
10
DIN-Audio
100
10
1
1
-80 -70 -60 -50 -40 -30 -20 -10 0
VolumeGain[dB]
Gain [dB]
Volume
10 20
-20 -15 -10 -5
0
5
10 15 20
Bass Gain [dB]
Bass Gain [dB]
Figure 14. Output Noise vs Bass Gain
Figure 13. Output Noise vs Volume Gain
1000
1000
IHF-A
出力雑音電圧
[uVrms]
Output Noise [µVrms]
DIN-Audio
出力雑音電圧
[uVrms]
Output Noise [µVrms]
IHF-A
100
10
1
DIN-Audio
IHF-A
100
10
1
-20 -15 -10 -5 0 5 10 15 20
MiddleGain
Gain [dB]
[dB]
Middle
-20 -15 -10 -5 0 5 10 15 20
Treble Gain [dB]
Treble Gain [dB]
Figure 15. Output Noise vs Middle Gain
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© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
Figure 16. Output Noise vs Treble Gain
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TSZ02201-0C2C0E100490-1-2
16.Dec.2015 Rev.001
BD37524FS
Typical Performance Curves – continued
2.5
0
最大出力[Vrms]
Output
Voltage : VOUT [Vrms]
Gain
(dB)
Gain [dB]
-10
-20
-30
-40
-50
-60
-70
2.0
1.5
1.0
0.5
0.0
10
100
1k
10k
100k
Frequency [Hz]
100
1000
10000
R
LOAD [ohm]
出力負荷[ohm]
FigureFrequency
17. CMRR vs(Hz)
Frequency
Figure 18. Output Voltage vs RLOAD
Figure 19. Advanced Switch 1
Figure 20. Advanced Switch 2
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TSZ22111・15・001
10/31
100000
TSZ02201-0C2C0E100490-1-2
16.Dec.2015 Rev.001
BD37524FS
Typical Performance Curves – continued
3.5
Output Voltage : VOUT [V]
3
2.5
2
1.5
1
0.5
0
0
0.5
1
1.5
2
2.5
3
Input Voltage : VIN [Vrms]
Figure 21. Output Voltage vs Level Meter VIN
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TSZ22111・15・001
11/31
TSZ02201-0C2C0E100490-1-2
16.Dec.2015 Rev.001
BD37524FS
Timing Chart
Control Signal Specification
(1) Electrical Specifications and Timing for Bus Lines and I/O Stages
SDA
tBUF
tLOW
tHD;STAT
tF
t
R
tSP
SCL
tHD;STA
P
tHD;DAT
tHIGH
tSU;DAT
tSU;STAT
tSU;STOT
Sr
S
P
Figure 22. Definition of Timing on the
I2C-bus
Table 1 Characteristics of the SDA and SCL bus lines for I2C-bus devices
(Unless specified otherwise, Ta=25°C, VCC=8.5V)
Parameter
Symbol
SCL clock frequency
Bus free time between a STOP and START condition
Hold time (repeated) START condition. After this period, the first
3
clock pulse is generated
4 LOW period of the SCL clock
5 HIGH period of the SCL clock
6 Set-up time for a repeated START condition
7 Data hold time:
8 Data set-up time
9 Set-up time for STOP condition
All values are referred to VIH min and VIL max Levels (see Table 2).
1
2
Fast-mode I2C-bus
Unit
fSCL
tBUF
Min
0
1.3
Max
400
－
kHz
μS
tHD;STA
0.6
－
μS
tLOW
tHIGH
1.3
0.6
0.6
0.06(Note)
120
0.6
－
－
－
－
－
－
μS
μS
μS
μS
ns
μS
tSU;STA
tHD;DAT
tSU;DAT
tSU;STO
(Note) The device must internally provide a hold time of at least 300 ns for the SDA signal (refer to the VIH min of the SCL signal) in order to bridge the
undefined region of the falling edge of SCL.
For 7(tHD;DAT) and 8(tSU;DAT), make the setup in which the margin is fully in .
Table 2 Characteristics of the SDA and SCL I/O stages for I2C-bus devices
Parameter
10
11
12
13
14
Symbol
LOW level input voltage:
VIL
HIGH level input voltage:
VIH
Pulse width of spikes which must be suppressed by the input filter.
tSP
LOW level output voltage: at 3mA sink current
VOL1
Input current each I/O pin with an input voltage between 0.4V and
II
4.5V.
tHD;STA
tHD;DAT
tSU;DAT
ｔHD;STA
ｔHD;DAT
ｔSU;DAT
：2us
：1us
：1us
:2µs
:1µs
:1µs
Fast-mode devices
Min
-0.3
2.3
0
0
Max
+1
5
50
0.4
-10
+10
Unit
V
V
ns
V
μA
tSU;STO
ｔSU;STO
：2us
:2µs
SCL
SCL
ｔBUF
tBUF
：4us
:4µs
ｔLOW
tLOW
：3us
:3µs
ｔHIGH
tHIGH
：1us
:1µs
SDA
SDA
SCL
: 250 kHz
SCLclock
clockfrequency
frequency：250kHz
Figure 23. A Command Timing Example in the I2C Data Transmission
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TSZ22111・15・001
12/31
TSZ02201-0C2C0E100490-1-2
16.Dec.2015 Rev.001
BD37524FS
(2) I2C BUS FORMAT
S
1bit
MSB
LSB
Slave Address
8bit
S
Slave Address
A
Select Address
Data
P
MSB
LSB
MSB
LSB
A
Select Address
A
Data
A
P
1bit
8bit
1bit
8bit
1bit 1bit
= Start condition (Recognition of start bit)
= Recognition of slave address. The first 7 bits corresponds to slave address..
The least significant bit is “L” corresponds to write mode.
= ACKNOWLEDGE bit (Recognition of acknowledgement)
= Select address for volume, bass and treble.
= Data on every volume and tone.
= Stop condition (Recognition of stop bit)
(3) I2C BUS Interface Protocol
(a) Basic form
S
Slave Address
A
Select Address
MSB
LSB
MSB
LSB
A
Data
A
MSB
LSB
P
(b) Automatic increment (Select Address increases (+1) according to the number of data.
S
Slave Address
A
Select Address
A
Data1
A
Data2
A ････
MSB
LSB MSB
LSB MSB
LSB
MSB
LSB
(Example) ①Data1 shall be set as data of address specified by Select Address.
②Data2 shall be set as data of address specified by Select Address +1.
③DataN shall be set as data of address specified by Select Address +N-1.
DataN
A
P
MSB LSB
(c) Configuration unavailable for transmission (In this case, only Select Address1 is set.
S Slave Address A
Select Address1 A Data
A Select Address 2 A Data
A
MSB
LSB MSB
LSB MSB LSB MSB
LSB MSB LSB
(Note) If any data is transmitted as Select Address 2 next to data, it is recognized
as data, not as Select Address 2.
P
(4) Slave address
MSB
A6
1
A5
0
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TSZ22111・15・001
A4
0
A3
0
A2
0
13/31
A1
0
A0
0
LSB
R/W
0
80H
TSZ02201-0C2C0E100490-1-2
16.Dec.2015 Rev.001
BD37524FS
(5) Select Address & Data
Select
Address
(hex)
Items
MSB
Data
D7
D6
0
Initial setup 1
01
Advanced
switch
ON/OFF
Initial setup 2
02
LPF
Phase
Initial setup 3
Input Selector
03
05
Input gain
06
Volume gain
Fader 1ch Front
Fader 2ch Front
Fader 1ch Rear
Fader 2ch Rear
Fader Subwoofer
Bass setup
Middle setup
Treble setup
20
28
29
2A
2B
2C
41
44
47
Bass gain
51
Middle gain
54
Treble gain
57
Loudness Gain
System Reset
75
FE
0
0
Mute
ON/OFF
0
0
0
Bass
Boost/
Cut
Middle
Boost/
Cut
Treble
Boost/
Cut
0
1
Level
Meter
RESET
0
0
0
D5
D4
Advanced switch time
of Input Gain/Volume
Tone/Fader/Loudnes
s
LSB
D3
D2
0
0
0
Subwoofer
LPF fc
LPF
Phase
0
Input selector
0
0
0
0
0
Loudness fo
0
D0
Advanced switch time
of Mute
Level
Meter
RESET
1
Input Gain
Volume Gain / Attenuation
Fader Gain / Attenuation
Fader Gain / Attenuation
Fader Gain / Attenuation
Fader Gain / Attenuation
Fader Gain / Attenuation
Bass fo
0
Middle fo
0
Treble fo
0
0
0
0
D1
0
0
0
0
0
Bass Gain
0
0
Middle Gain
0
0
Treble Gain
Loudness HiCut
0
0
0
0
Bass Q
Middle Q
0
Treble Q
Loudness Gain
0
0
1
Advanced switch
Note
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→75
3.
Advanced switch is not used for the function of input selector. 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.
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TSZ22111・15・001
14/31
TSZ02201-0C2C0E100490-1-2
16.Dec.2015 Rev.001
BD37524FS
Select address 01 (hex)
MSB
Time
D7
0.6msec
Advanced
1.0msec
Switch
1.4msec
ON/OFF
3.2msec
Time
MSB
D7
4.7 msec
7.1 msec
11.2 msec
14.4 msec
Advanced
Switch
ON/OFF
Mode
MSB
D7
OFF
0
ON
1
Select address 02(hex)
MSB
fc
D7
OFF
55Hz
85Hz
LPF Phase
120Hz
160Hz
Prohibition
Mode
MSB
D7
HOLD
RESET
LPF Phase
Phase
MSB
D7
0°
0
180°
1
Select address 03(hex)
MSB
f0
D7
250Hz
400Hz
0
800Hz
Prohibition
Advanced switch time of Mute
D5
D4
D3
D2
D1
0
Advanced switch time
0
0
of Input gain/Volume
0
0
1
Tone/Fader/Loudness
1
D6
LSB
D0
0
1
0
1
Advanced switch time of
LSB
Input gain/Volume/Tone/Fader/Loudness
D6
D5
D4
D3
D2
D1
D0
0
0
0
1
Advanced switch
0
0
0
Time of Mute
1
0
1
1
D6
0
D6
Level
Meter
RESET
D6
0
1
Advanced switch ON/OFF
LSB
D5
D4
D3
D2
D1
D0
Advanced switch time
Advanced switch
of Input gain/Volume
0
0
Time of Mute
Tone/Fader/Loudness
Subwoofer LPF fc
D5
D4
D3
D2
0
0
0
0
0
0
0
1
Level Meter RESET
D5
D4
D3
D2
0
0
D6
Level
Meter
RESET
D5
D6
D5
0
0
0
LPF Phase
D4
D3
0
0
D1
LSB
D0
0
1
0
1
0
LSB
D0
Subwoofer LPF fc
D2
0
Loudness fo
D4
D3
0
0
0
1
1
0
1
1
D1
0
0
1
1
0
Other setting
D1
LSB
D0
Subwoofer LPF fc
D2
D1
LSB
D0
0
0
1
: Initial condition
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TSZ22111・15・001
15/31
TSZ02201-0C2C0E100490-1-2
16.Dec.2015 Rev.001
BD37524FS
Select address 05(hex)
MSB
Input Selector
OUT OUT
Mode
F1/R1 F2/R2
D7
D6
D5
D4
D3
D2
D1
Initial
0
0
0
A
A1
A2
0
0
0
B
B1
B2
0
0
1
C diff CP1
CP2
0
1
1
0
0
0
0
D
D1
D2
1
0
1
E
E1
E2
1
0
1
Input SHORT
1
0
0
Prohibition
Other setting
Input SHORT : The input impedance of each input terminal is lowered from 100kΩ(Typ) to 6 kΩ(Typ).
(For quick charge of coupling capacitor)
Select address 06 (hex)
MSB
Gain
D7
0dB
1dB
2dB
3dB
4dB
5dB
6dB
7dB
8dB
9dB
10dB
11dB
Mute
12dB
ON/OFF
13dB
14dB
15dB
16dB
17dB
18dB
19dB
20dB
D6
D5
0
0
Input Gain
D4
D3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
1
0
1
1
：
：
D2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
0
D1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
LSB
D0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
：
1
：
1
：
1
Mute ON/OFF
D4
D3
D2
D1
LSB
D0
Prohibition
1
Mode
OFF
ON
MSB
D7
0
1
D6
D5
0
0
LSB
D0
0
1
0
0
0
1
1
1
Input Gain
: Initial condition
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TSZ22111・15・001
16/31
TSZ02201-0C2C0E100490-1-2
16.Dec.2015 Rev.001
BD37524FS
Select address 20, 28, 29, 2A, 2B, 2C (hex)
MSB
Vol,
Gain & ATT
D7
D6
0
0
0
0
Prohibition
：
：
0
1
15dB
0
1
14dB
0
1
13dB
0
1
：
：
：
Fader
D5
0
0
Gain / Attenuation
D4
D3
D2
D1
0
0
0
0
0
0
0
0
LSB
D0
0
1
：
1
1
1
1
：
1
1
1
1
：
0
0
0
0
：
0
0
0
0
：
0
0
1
1
：
0
1
0
1
-77dB
-78dB
-79dB
1
1
1
1
1
1
1
1
：
0
0
0
0
：
0
0
0
1
：
1
1
1
0
：
1
1
1
0
：
0
1
1
0
：
1
0
1
0
Prohibition
：
1
1
：
1
1
：
1
1
：
1
1
：
1
1
：
1
1
：
1
1
：
0
1
D5
Bass
D4
D1
0
0
1
1
LSB
D0
0
1
0
1
D1
LSB
D0
-∞dB
Select address 41(hex)
Q factor
MSB
D7
D6
0.5
1.0
1.5
2.0
0
0
fo
MSB
D7
D6
60Hz
80Hz
100Hz
120Hz
0
0
Q factor
MSB
D7
D6
0.75
1.0
1.25
1.5
0
0
fo
MSB
D7
D6
500Hz
1kHz
1.5kHz
2.5kHz
0
0
Q factor
D3
D2
Bass fo
Bass
D4
0
1
0
1
D5
0
0
1
1
0
fo
D3
0
0
D2
Bass
Q factor
0
Select address 44(hex)
D5
Middle
D4
Middle fo
D5
0
0
1
1
Q factor
D3
D2
0
Middle
fo
D4
D3
0
1
0
0
1
0
D2
0
D1
0
0
1
1
LSB
D0
0
1
0
1
D1
LSB
D0
Middle
Q factor
: Initial condition
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TSZ22111・15・001
17/31
TSZ02201-0C2C0E100490-1-2
16.Dec.2015 Rev.001
BD37524FS
Select address 47 (hex)
Q factor
MSB
D7
D6
0.75
1.25
0
0
fo
MSB
D7
D6
7.5kHz
10kHz
12.5kHz
15kHz
0
0
Select address 51, 54, 57 (hex)
MSB
Gain
D7
0dB
1dB
2dB
3dB
4dB
5dB
6dB
7dB
8dB
9dB
10dB
Bass/
11dB
Middle/
12dB
Treble
13dB
Boost
14dB
/Cut
15dB
16dB
17dB
18dB
19dB
20dB
D6
0
D5
Treble
D4
Treble fo
D5
0
0
1
1
Boost
Cut
0
Treble
fo
D4
D3
0
1
0
0
1
：
1
1
MSB
D7
0
1
0
：
1
1
D1
0
D2
D1
0
0
Bass/ Middle/ Treble Gain
D5
D4
D3
D2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
1
0
0
1
0
0
1
0
1
0
0
1
0
0
1
0
0
1
0
0
1
1
0
0
1
1
0
1
1
0
1
1
1
0
0
1
0
0
1
0
0
1
0
0
1
0
1
1
0
1
Prohibition
Mode
Q factor
D3
D2
：
1
1
0
LSB
D0
Treble
Q factor
D1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
LSB
D0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
：
1
1
：
0
1
Bass/ Middle/ Treble Boost/Cut
D6
D5
D4
D3
D2
D1
0
LSB
D0
0
1
LSB
D0
Bass/Middle/Treble Gain
: Initial condition
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TSZ22111・15・001
18/31
TSZ02201-0C2C0E100490-1-2
16.Dec.2015 Rev.001
BD37524FS
Select address 75 (hex)
Mode
MSB
D7
HiCut1
HiCut2
HiCut3
HiCut4
0
Gain
MSB
D7
0dB
1dB
2dB
3dB
4dB
5dB
6dB
7dB
8dB
9dB
10dB
11dB
12dB
13dB
14dB
15dB
16dB
17dB
18dB
19dB
20dB
0
D1
LSB
D0
Loudness Gain
D4
D3
D2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
1
0
0
1
0
0
1
0
1
0
0
1
0
0
1
0
0
1
0
Loudness HiCut
0
1
1
0
1
1
0
1
1
0
1
1
1
0
0
1
0
0
1
0
0
1
0
0
1
0
1
1
0
1
D1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
LSB
D0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
：
1
：
1
：
1
D6
0
0
1
1
D5
0
1
0
1
D6
Loudness HiCut
D4
D3
D2
Loudness Gain
D5
Prohibition
：
1
：
1
: Initial condition
(6) About Power ON Reset
The IC has a built-in initialization circuit that triggers at power ON of supply voltage. Please send initial data to all
addresses at supply voltage ON. Also, please turn ON MUTE at the set side until this initial data is sent.
Parameter
Symbol
Rise Time of VCC
VCC Voltage of Release
Power ON Reset
Limit
Unit
Min
Typ
Max
tRISE
33
－
－
µsec
VPOR
－
4.1
－
V
Conditions
VCC rise time from 0V to 5V
(7) About External Compulsory Mute Terminal
It is possible to forcibly set Mute externally by setting the input voltage at the MUTE terminal.
Mute Voltage Condition
GND to 1.0V
2.3V to VCC
Mode
MUTE ON
MUTE OFF
Establish the voltage of MUTE in the condition to be defined.
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© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
19/31
TSZ02201-0C2C0E100490-1-2
16.Dec.2015 Rev.001
BD37524FS
Application Information
1.
Function and Specifications
Function
Input selector
Input gain
Mute
Volume
Specifications
・Stereo 4 input
・Differential 1 input
・+20dB to 0dB (1dB step)
・Possible to use “Advanced switch” for prevention of switching noise.
・Possible to use “Advanced switch” for prevention of switching noise.
・+15dB to -79dB (1dB step), -∞dB
・Possible to use “Advanced switch” for prevention of switching noise.
・+20dB to -20dB (1dB step)
Bass
・Q=0.5, 1, 1.5, 2 variable
・fo=60, 80, 100, 120Hz
・Possible to use “Advanced switch” at changing gain
・+20dB to -20dB (1dB step)
Middle
・Q=0.75, 1, 1.25, 1.5 variable
・fo=500, 1k, 1.5k, 2.5kHz variable
・Possible to use “Advanced switch” when changing gain
・+20dB to -20dB (1dB step)
Treble
・Q=0.75, 1.25 variable
・fo=7.5k, 10k, 12.5k, 15kHz variable
・Possible to use “Advanced switch” when changing gain
Fader
Loudness
LPF
Level meter
・+15dB to -79dB(1dB step), -∞dB
・Possible to use “Advanced switch” for prevention of switching noise.
・20dB to 0dB(1dB step)
・fo=250/400/800Hz
・Possible to use “Advanced switch” for prevention of switching noise.
・fc=55/85/120/160Hz, pass
・Phase shift (0°/180°)
・I C BUS control
・DC Output
2
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TSZ22111・15・001
20/31
TSZ02201-0C2C0E100490-1-2
16.Dec.2015 Rev.001
BD37524FS
2.
Volume / Fader Volume Attenuation Data
(dB)
+15
+14
+13
+12
+11
+10
+9
+8
+7
+6
+5
+4
+3
+2
+1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
-12
-13
-14
-15
-16
-17
-18
-19
-20
-21
-22
-23
-24
-25
-26
-27
-28
-29
-30
-31
-32
D7
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
D6
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D5
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
D4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
D3
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
D2
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
D1
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
(dB)
-33
-34
-35
-36
-37
-38
-39
-40
-41
-42
-43
-44
-45
-46
-47
-48
-49
-50
-51
-52
-53
-54
-55
-56
-57
-58
-59
-60
-61
-62
-63
-64
-65
-66
-67
-68
-69
-70
-71
-72
-73
-74
-75
-76
-77
-78
-79
-∞
D0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
D7
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
D6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
D5
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
D4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
D3
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
D2
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
1
D1
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
1
D0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
：Initial condition
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TSZ02201-0C2C0E100490-1-2
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BD37524FS
(1) About Level Meter
(a) The Operation of Circuit
Level meter is a function which gives DC voltage proportional to the size of signal of sound. It detects the peak
level of signal and keeps the peak level, so that it is possible to monitor the size of signal by resetting DC
voltage kept with suitable interval.
(b) The Way to Reset Level Meter Output
Please send reset data through I2C BUS
To reset output of level meter : Send D6 = “ 1 “ of select address 02(hex).
To cancel output reset of level meter (HOLD)… to Send D6 = “ 0 “ of select address 02(hex).
(c) The Settings About Period of Reset
Peak hold operation will start after HOLD data is transmitted. Set the WAIT time after HOLD data
transmission according to the frequency bandwidth detected.
WAIT time must be set to a minimum of one cycle over the detected frequency bandwidth.
Ex) Detected frequency bandwidth is above 40Hz, 『40Hz = 25ms = WAIT time』
Transmission Example by I2C BUS
(RESET)
I2CBUS
80 10
02
RESET
START
40
(HOLD)
80
02
00
Wait time
(25msec)
HOLD
START
fin＝40Hz
LOUT [ V ]
detect
(
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BD37524FS
3.
Application Circuit
GND
SDA
SCL
10μ
VCC
OUTF1 OUTF2 OUTR1 OUTR2 OUTS1 OUTS2 LOUT
0.1μ
10μ
21
20
19
18
17
Fader★
22
10μ
Fader★
23
10μ
Fader★
24
10μ
10μ
16
MUTE
10μ
15
14
13
VCC
GND
I2C BUS LOGIC
Fader★
Fader★
Fader
■Fader
Gain:+15dB to -79dB/1dB step
Gain:+15dB～-79ｄB/1dB
step
★no pop noise
■LPF
fc=55/85/120/160Hz
Loudness
■Loudness
Gain: 20dB to 0dB/1dB step
Gain:20dB～0ｄB/1ｄB
step
★no pop noise
・ｆ0=250/400/800Hz
・Hicut:1/2/3/4
■3 Band P-EQ (Tone control)
Gain: +20dB to -20dB/1dB step
Gain：+20dB～-20dB/1dB
★no pop noise
・Bass：f0=60/80/100/120Hz
Q=0.5/1.0/1.5/2.0
・Meddle:f0=500/1k/1.5k/2.5kHz
Q=0.75/1/1.25/1.5
・Treble：f0=7.5k/10k/12.5k/15kHz
Q=0.75/1.25
■Volume
Gain: +15dB to -79dB/1dB step
Gain：+15dB～-79dB/1dB
step
★no pop noise
■Input Gain
Gain:
+20dB to 0dB/1dB step
Gain：+20dB～0dB/1dB
step
★no pop noise
LPF
★Loudness
★3 Band P-EQ
(Tone control)
★Volume/Mute
Level
meter
★Input Gain
Input selector (4 single-end and 1 stereo ISO)
GND
ISO amp
Unit
R : [Ω]
C : [F]
GND
ISO amp
VCC/2
100k
1
2
10μ
100k
3
2.2μ
Single1
100k
4
2.2μ
100k
5
2.2μ
Single2
250k
6
2.2μ
250k
7
2.2μ
250k
8
10μ
GND Isolation
250k
10
9
2.2μ
250k
1μ
Single3
250k
11
1μ
250k
12
1μ
1μ
Single4
Notes on wiring
① Please connect the decoupling capacitor of a power supply in the shortest distance as much as possible to GND.
② GND lines should be one-point connected.
③ Wiring pattern of Digital should be away from that of analog unit and crosstalk is not acceptable.
④ Lines of SCL and SDA of I2C BUS should not be parallel if possible.
The lines should be shielded, if they are adjacent to each other.
⑤ Analog input lines should not be parallel if possible. The lines should be shielded if they are adjacent to each other.
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TSZ22111・15・001
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TSZ02201-0C2C0E100490-1-2
16.Dec.2015 Rev.001
BD37524FS
Power Dissipation
About the thermal design of the IC
Characteristics of an IC are greatly affected by the temperature at which it is used. Exceeding absolute maximum ratings
may degrade and destroy the device. Careful consideration must be given to the heat of the IC from the two standpoints of
immediate damage and long-term reliability of operation..
Reference data
SSOP-A24
Power Dissipation : Pd (W)
1.5
Measurement condition: ROHM Standard board
board Size : 70 x 70 x 1.6(mm3)
material : A FR4 grass epoxy board
(3% or less of copper foil area)
1.0W
1.0
θja = 125 °C/W
0.5
0.0
0
25
50
75
85
100
125
150
Ambient Temperature : Ta (°C)
Figure 24. Temperature Derating Curve
(Note) Values are actual measurements and are not guaranteed.
Power dissipation values vary according to the board on which the IC is mounted.
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BD37524FS
I/O Equivalent Circuits
Pin
No.
Pin
Name
Pin
Voltage
Equivalent Circuit
Pin Description
A terminal for signal input.
The input impedance is 100kΩ(typ).
VCC
2
A1
3
A2
4
B1
5
B2
4.25
100K
GND
A terminal for signal input.
The input impedance is 250kΩ(typ).
VCC
6
CP1
7
CN
8
CP2
9
D1
10
D2
11
E1
12
E2
4.25
250k
GND
A terminal for external compulsory mute. If
terminal voltage is High level, the mute is
OFF. If the terminal voltage is Low level, the
Mute is ON.
VCC
13
MUTE
－
1.65V
GND
A terminal for Fader and Subwoofer output.
VCC
16
OUTS1
17
OUTR2
18
OUTR1
19
OUTF2
20
OUTF1
4.25
GND
The values in the pin explanation and input/output equivalent circuit are for reference purposes only. It is not a guaranteed value.
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BD37524FS
I/O Equivalent Circuits – continued
Pin
No.
Pin
Name
Pin
Voltage
Equivalent Circuit
Pin Description
Power supply terminal.
21
VCC
8.5
A terminal for clock input of I2C BUS
communication.
VCC
22
SCL
－
1.65V
GND
A terminal for data input of I2C BUS
communication.
VCC
23
SDA
－
1.65V
GND
Ground terminal.
24
GND
0
Voltage for reference bias of analog signal
system. The simple precharge circuit and
simple discharge circuit for an external
capacitor are built in.
VCC
50k
1
FIL
4.25
50k
GND
The values in the pin explanation and input/output equivalent circuit are for reference purposes only. It is not a guaranteed value.
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BD37524FS
Operational Notes
1.
Reverse Connection of Power Supply
Connecting the power supply in reverse polarity can damage the IC. Take precautions against reverse polarity when
connecting the power supply, such as mounting an external diode between the power supply and the IC’s power
supply pins.
2.
Power Supply Lines
Design the PCB layout pattern to provide low impedance supply lines. Separate the ground and supply lines of the
digital and analog blocks to prevent noise in the ground and supply lines of the digital block from affecting the analog
block. Furthermore, connect a capacitor to ground at all power supply pins. Consider the effect of temperature and
aging on the capacitance value when using electrolytic capacitors.
3.
Ground Voltage
Ensure that no pins are at a voltage below that of the ground pin at any time, even during transient condition.
4.
Ground Wiring Pattern
When using both small-signal and large-current ground traces, the two ground traces should be routed separately but
connected to a single ground at the reference point of the application board to avoid fluctuations in the small-signal
ground caused by large currents. Also ensure that the ground traces of external components do not cause variations
on the ground voltage. The ground lines must be as short and thick as possible to reduce line impedance.
5.
Thermal Consideration
Should by any chance the power dissipation rating be exceeded the rise in temperature of the chip may result in
deterioration of the properties of the chip. In case of exceeding this absolute maximum rating, increase the board size
and copper area to prevent exceeding the Pd rating.
6.
Recommended Operating Conditions
These conditions represent a range within which the expected characteristics of the IC can be approximately obtained.
The electrical characteristics are guaranteed under the conditions of each parameter.
7.
Inrush Current
When power is first supplied to the IC, it is possible that the internal logic may be unstable and inrush current may flow
instantaneously due to the internal powering sequence and delays, especially if the IC has more than one power
supply. Therefore, give special consideration to power coupling capacitance, power wiring, width of ground wiring, and
routing of connections.
8.
Operation Under Strong Electromagnetic Field
Operating the IC in the presence of a strong electromagnetic field may cause the IC to malfunction.
9.
Testing on Application Boards
When testing the IC on an application board, connecting a capacitor directly to a low-impedance output pin may
subject the IC to stress. Always discharge capacitors completely after each process or step. The IC’s power supply
should always be turned off completely before connecting or removing it from the test setup during the inspection
process. To prevent damage from static discharge, ground the IC during assembly and use similar precautions during
transport and storage.
10. Inter-pin Short and Mounting Errors
Ensure that the direction and position are correct when mounting the IC on the PCB. Incorrect mounting may result in
damaging the IC. Avoid nearby pins being shorted to each other especially to ground, power supply and output pin.
Inter-pin shorts could be due to many reasons such as metal particles, water droplets (in very humid environment) and
unintentional solder bridge deposited in between pins during assembly to name a few.
11. Unused Input Pins
Input pins of an IC are often connected to the gate of a MOS transistor. The gate has extremely high impedance and
extremely low capacitance. If left unconnected, the electric field from the outside can easily charge it. The small charge
acquired in this way is enough to produce a significant effect on the conduction through the transistor and cause
unexpected operation of the IC. So unless otherwise specified, unused input pins should be connected to the power
supply or ground line.
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BD37524FS
Operational Notes – continued
12. Regarding the Input Pin of the IC
This monolithic IC contains P+ isolation and P substrate layers between adjacent elements in order to keep them
isolated. P-N junctions are formed at the intersection of the P layers with the N layers of other elements, creating a
parasitic diode or transistor. For example (refer to figure below):
When GND > Pin A and GND > Pin B, the P-N junction operates as a parasitic diode.
When GND > Pin B, the P-N junction operates as a parasitic transistor.
Parasitic diodes inevitably occur in the structure of the IC. The operation of parasitic diodes can result in mutual
interference among circuits, operational faults, or physical damage. Therefore, conditions that cause these diodes to
operate, such as applying a voltage lower than the GND voltage to an input pin (and thus to the P substrate) should be
avoided.
Resistor
Transistor (NPN)
Pin A
Pin B
C
E
Pin A
N
P+
P
N
N
P+
N
Pin B
B
Parasitic
Elements
N
P+
N P
N
P+
B
N
C
E
Parasitic
Elements
P Substrate
P Substrate
GND
GND
Parasitic
Elements
GND
Parasitic
Elements
GND
N Region
close-by
Figure 25. Example of monolithic IC structure
13. About a Signal Input Part
(a) About Input Coupling Capacitor Constant Value
In the input signal terminal, please decide the constant value of the input coupling capacitor C(F) that would be
sufficient to form an RC characterized HPF with input impedance R IN(Ω) inside the IC.
G〔dB〕
C〔F〕
0
RIN
〔Ω〕
A(f)
SSH
f〔Hz〕
INPUT
A f  
2 fCRIN 2
2
1  2 fCRIN 
(b) About the Input Selector SHORT
SHORT mode is the command which makes switch SSH =ON of input selector part so that the input impedance
RIN of all terminals becomes small. Switch SSH is OFF when SHORT command is not selected.
The constant time brought about by the small resistance inside and the capacitor outside the LSI becomes
small when this command is used. The charge time of the capacitor becomes short. Since SHORT mode turns
ON the switch of SSH and makes it low impedance, please use it at no signal condition.
14. About Mute Terminal(Pin 13) when power supply is OFF
There should be no applied voltage across the Mute terminal (Pin 13) when power-supply is OFF.
A resistor (about 2.2kΩ) should be connected in series to Mute terminal in case a voltage is supplied to Mute terminal.
(Please refer Application Circuit Diagram.)
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BD37524FS
Ordering Information
B
D
3
7
5
Part Number
2
4
F
S
-
Package
FS: SSOP-A24
E2
Packaging and forming specification
E2: Embossed tape and reel
Marking Diagram
SSOP-A24(TOP VIEW)
Part Number Marking
BD37524FS
LOT Number
1PIN MARK
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BD37524FS
Physical Dimension, Tape and Reel Information
Package Name
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BD37524FS
Revision History
Date
Revision
16.Dec.2015
001
Changes
New Release
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Datasheet
Notice
Precaution on using ROHM Products
1.
Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment,
OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you
(Note 1)
, transport
intend to use our Products in devices requiring extremely high reliability (such as medical equipment
equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car
accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or
serious damage to property (“Specific Applications”), please consult with the ROHM sales representative in advance.
Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any
damages, expenses or losses incurred by you or third parties arising from the use of any ROHM’s Products for Specific
Applications.
(Note1) Medical Equipment Classification of the Specific Applications
JAPAN
USA
EU
CHINA
CLASSⅢ
CLASSⅡb
CLASSⅢ
CLASSⅢ
CLASSⅣ
CLASSⅢ
2.
ROHM designs and manufactures its Products subject to strict quality control system. However, semiconductor
products can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate
safety measures including but not limited to fail-safe design against the physical injury, damage to any property, which
a failure or malfunction of our Products may cause. The following are examples of safety measures:
[a] Installation of protection circuits or other protective devices to improve system safety
[b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure
3.
Our Products are designed and manufactured for use under standard conditions and not under any special or
extraordinary environments or conditions, as exemplified below. Accordingly, ROHM shall not be in any way
responsible or liable for any damages, expenses or losses arising from the use of any ROHM’s Products under any
special or extraordinary environments or conditions. If you intend to use our Products under any special or
extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of
product performance, reliability, etc, prior to use, must be necessary:
[a] Use of our Products in any types of liquid, including water, oils, chemicals, and organic solvents
[b] Use of our Products outdoors or in places where the Products are exposed to direct sunlight or dust
[c] Use of our Products in places where the Products are exposed to sea wind or corrosive gases, including Cl2,
H2S, NH3, SO2, and NO2
[d] Use of our Products in places where the Products are exposed to static electricity or electromagnetic waves
[e] Use of our Products in proximity to heat-producing components, plastic cords, or other flammable items
[f] Sealing or coating our Products with resin or other coating materials
[g] Use of our Products without cleaning residue of flux (even if you use no-clean type fluxes, cleaning residue of
flux is recommended); or Washing our Products by using water or water-soluble cleaning agents for cleaning
residue after soldering
[h] Use of the Products in places subject to dew condensation
4.
The Products are not subject to radiation-proof design.
5.
Please verify and confirm characteristics of the final or mounted products in using the Products.
6.
In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse. is applied,
confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power
exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect
product performance and reliability.
7.
De-rate Power Dissipation depending on ambient temperature. When used in sealed area, confirm that it is the use in
the range that does not exceed the maximum junction temperature.
8.
Confirm that operation temperature is within the specified range described in the product specification.
9.
ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in
this document.
Precaution for Mounting / Circuit board design
1.
When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product
performance and reliability.
2.
In principle, the reflow soldering method must be used on a surface-mount products, the flow soldering method must
be used on a through hole mount products. If the flow soldering method is preferred on a surface-mount products,
please consult with the ROHM representative in advance.
For details, please refer to ROHM Mounting specification
Notice-PGA-E
© 2015 ROHM Co., Ltd. All rights reserved.
Rev.002
Datasheet
Precautions Regarding Application Examples and External Circuits
1.
If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the
characteristics of the Products and external components, including transient characteristics, as well as static
characteristics.
2.
You agree that application notes, reference designs, and associated data and information contained in this document
are presented only as guidance for Products use. Therefore, in case you use such information, you are solely
responsible for it and you must exercise your own independent verification and judgment in the use of such information
contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses or losses
incurred by you or third parties arising from the use of such information.
Precaution for Electrostatic
This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper
caution in your manufacturing process and storage so that voltage exceeding the Products maximum rating will not be
applied to Products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron,
isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control).
Precaution for Storage / Transportation
1.
Product performance and soldered connections may deteriorate if the Products are stored in the places where:
[a] the Products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2
[b] the temperature or humidity exceeds those recommended by ROHM
[c] the Products are exposed to direct sunshine or condensation
[d] the Products are exposed to high Electrostatic
2.
Even under ROHM recommended storage condition, solderability of products out of recommended storage time period
may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is
exceeding the recommended storage time period.
3.
Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads
may occur due to excessive stress applied when dropping of a carton.
4.
Use Products within the specified time after opening a humidity barrier bag. Baking is required before using Products of
which storage time is exceeding the recommended storage time period.
Precaution for Product Label
QR code printed on ROHM Products label is for ROHM’s internal use only.
Precaution for Disposition
When disposing Products please dispose them properly using an authorized industry waste company.
Precaution for Foreign Exchange and Foreign Trade act
Since concerned goods might be fallen under listed items of export control prescribed by Foreign exchange and Foreign
trade act, please consult with ROHM in case of export.
Precaution Regarding Intellectual Property Rights
1.
All information and data including but not limited to application example contained in this document is for reference
only. ROHM does not warrant that foregoing information or data will not infringe any intellectual property rights or any
other rights of any third party regarding such information or data.
2.
ROHM shall not have any obligations where the claims, actions or demands arising from the combination of the
Products with other articles such as components, circuits, systems or external equipment (including software).
3.
No license, expressly or implied, is granted hereby under any intellectual property rights or other rights of ROHM or any
third parties with respect to the Products or the information contained in this document. Provided, however, that ROHM
will not assert its intellectual property rights or other rights against you or your customers to the extent necessary to
manufacture or sell products containing the Products, subject to the terms and conditions herein.
Other Precaution
1.
This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM.
2.
The Products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written
consent of ROHM.
3.
In no event shall you use in any way whatsoever the Products and the related technical information contained in the
Products or this document for any military purposes, including but not limited to, the development of mass-destruction
weapons.
4.
The proper names of companies or products described in this document are trademarks or registered trademarks of
ROHM, its affiliated companies or third parties.
Notice-PGA-E
© 2015 ROHM Co., Ltd. All rights reserved.
Rev.002
Datasheet
General Precaution
1. Before you use our Pro ducts, you are requested to care fully read this document and fully understand its contents.
ROHM shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny
ROHM’s Products against warning, caution or note contained in this document.
2. All information contained in this docume nt is current as of the issuing date and subj ect to change without any prior
notice. Before purchasing or using ROHM’s Products, please confirm the la test information with a ROHM sale s
representative.
3.
The information contained in this doc ument is provi ded on an “as is” basis and ROHM does not warrant that all
information contained in this document is accurate an d/or error-free. ROHM shall not be in an y way responsible or
liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or
concerning such information.
Notice – WE
© 2015 ROHM Co., Ltd. All rights reserved.
Rev.001