○Product structure：Silicon monolithic integrated circuit ○This product has no designed protection against radioactive rays
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TSZ02201-0C2C0E100490-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
www.rohm.com
16.Dec.2015 Rev.001
Sound Processor with Built-in 3-band Equalizer
BD37524FS
General Description
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.
Features
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
Key Specifications
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)
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 car audio systems. It is also suitable for
other audio equipment such as mini Compo, micro
Compo, TV etc
SSOP-A24
10.00mm x 7.80mm x 2.10mm
Datashee
t
Datashee
t
BD37524FS
2/31
TSZ02201-0C2C0E100490-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
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TSZ22111・15・001
16.Dec.2015 Rev.001
Typical Application Circuit
Pin Configuration
Pin Descriptions
Pin No.
Pin Name
Description
Pin No.
Pin Name
Description
1
FIL
VCC/2 terminal
13
MUTE
External compulsory mute terminal
2
A1
A input terminal of 1ch
14
LOUT
Output terminal for Level meter
3
A2
A input terminal of 2ch
15
OUTS2
Subwoofer output terminal of 2ch
4
B1
B input terminal of 1ch
16
OUTS1
Subwoofer output terminal of 1ch
5
B2
B input terminal of 2ch
17
OUTR2
Rear output terminal of 2ch
6
CP1
C positive input terminal of 1ch
18
OUTR1
Rear output terminal of 1ch
7
CN
C negative input terminal
19
OUTF2
Front output terminal of 2ch
8
CP2
C positive input terminal of 2ch
20
OUTF1
Front output terminal of 1ch
9
D1
D input terminal of 1ch
21
VCC
Power supply terminal
10
D2
D input terminal of 2ch
22
SCL
I2C Communication clock terminal
11
E1
E input terminal of 1ch
23
SDA
I2C Communication data terminal
12
E2
E input terminal of 2ch
24
GND
GND terminal
BD37524FS
TOP VIEW
FIL 1
A1 2
A2 3
B1 4
B2 5
CP1 6
CN 7
CP2 8
E1 11
D1 9
D2 10
E2 12
24 GND
23 SDA
22 SCL
21 VCC
20 OUTF1
19 OUTF2
18 OUTR1
17 OUTR2
14 LOUT
16 OUTS1
15 OUTS2
13 MUTE
BD37524FS
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TSZ02201-0C2C0E100490-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
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TSZ22111・15・001
16.Dec.2015 Rev.001
Block Diagram
GND
VCC/2
★Volume/Mute
★3 Band P-EQ
(Tone control)
★Loudness
Fader★
Fader★
Fader★
Fader★
Fader★
LPF
★Input Gain
GND
ISO amp
Input selector (4 single-end and 1 stereo ISO)
14
100k100k100k100k250k
GND
ISO amp
250k250k250k250k250k250k
Level
meter
VCC
I2C BUS LOGIC
■Fader
Gain:+15dB～-79ｄB/1dB step
★no pop noise
■LPF
fc=55/85/120/160Hz
■Loudness
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～-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～-79dB/1dB step
★no pop noise
■Input Gain
Gain：+20dB～0dB/1dB step
★no pop noise
1 2 3 4 5 6 7 8 910 11 12
1324 23 22 21 20 19 18 17 16 15
Fader
Gain:+15dB to -79dB/1dB step
Loudness
Gain: 20dB to 0dB/1dB step
Gain: +20dB to -20dB/1dB
Gain: +15dB to -79dB/1dB step
Gain: +20dB to 0dB/1dB step
BD37524FS
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TSZ02201-0C2C0E100490-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
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TSZ22111・15・001
16.Dec.2015 Rev.001
Absolute Maximum Ratings (Ta=25°C)
Parameter
Symbol
Rating
Unit
Power supply Voltage
VCC
10.0
V
Input voltage
VIN
VCC+0.3 to GND-0.3
V
Power Dissipation
Pd
1 (Note 1)
W
Storage Temperature
Tstg
-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
(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)
BLOCK
Parameter
Symbol
Limit
Unit
Conditions
Min
Typ
Max
GENERAL
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
CB
-1.5
0
+1.5
dB
CB = GV1-GV2
Total Harmonic Distortion 1
(FRONT,REAR)
THD+N1
－
0.001
0.05
％
VOUT=1Vrms
BW=400Hz-30KHz
Total Harmonic Distortion 2
(SUBWOOFER)
THD+N2
－
0.002
0.05
％
VOUT=1Vrms
BW=400Hz-30KHz
Output Noise Voltage 1
(FRONT,REAR) *
VNO1
－
3.8
15
μVrms
Rg = 0Ω
BW = IHF-A
Output Noise Voltage 2
(SUBWOOFER) *
VNO2
－
4.8
15
μVrms
Rg = 0Ω
BW = IHF-A
Residual Output Noise Voltage *
VNOR
－
1.8
10
μVrms
Fader = -∞dB
Rg = 0Ω
BW = IHF-A
Crosstalk Between Channels *
CTC
－
-100
-90
dB
Rg = 0Ω
CTC=20log(VOUT/VIN)
BW = IHF-A
Ripple Rejection
RR
－
-70
-40
dB
f=1KHz
VRR=100mVrms
RR=20log(VCC IN/VOUT)
INPUT SELECTOR
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
VIM at THD+N(VOUT)=1％
BW=400Hz-30KHz
Crosstalk Between Selectors *
CTS
－
-100
-90
dB
Rg = 0Ω
CTS=20log(VOUT/VIN)
BW = IHF-A
Common Mode Rejection Ratio *
CMRR
50
65
－
dB
CP1 and CN input
CP2 and CN input
CMRR=20log(VIN/VOUT)
BW = IHF-A
INPUT GAIN
Minimum Input Gain
GIN_MIN
-2
0
+2
dB
Input gain 0dB
VIN=100mVrms
GIN=20log(VOUT/VIN)
Maximum Input Gain
GIN_MAX
18
20
22
dB
Input gain 20dB
VIN=100mVrms
GIN=20log(VOUT/VIN)
Gain Set Error
GIN_ERR
-2
0
+2
dB
GAIN=+20dB to +1dB
BD37524FS
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TSZ02201-0C2C0E100490-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
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TSZ22111・15・001
16.Dec.2015 Rev.001
Electrical Characteristics - continued
BLOCK
Parameter
Symbol
Limit
Unit
Conditions
Min
Typ
Max
MUTE
Mute Attenuation *
GMUTE
－
-105
-85
dB
Mute ON
GMUTE=20log(VOUT/VIN)
BW = IHF-A
VOLUME
Maximum Gain
GV_MAX
13
15
17
dB
Volume = 15dB
VIN=100mVrms
GV=20log(VOUT/VIN)
Maximum Attenuation *
GV_MIN
－
-100
-85
dB
Volume = -∞dB
GV=20log(VOUT/VIN)
BW = IHF-A
Attenuation Set Error 1
GV_ERR1
-2
0
+2
dB
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
ATT=-48dB to -79dB
BASS
Maximum Boost Gain
GB_BST
18
20
22
dB
Gain=+20dB f=100Hz
VIN=100mVrms
GB=20log (VOUT/VIN)
Maximum Cut Gain
GB_CUT
-22
-20
-18
dB
Gain=-20dB f=100Hz
VIN=2Vrms
GB=20log (VOUT/VIN)
Gain Set Error
GB_ERR
-2
0
+2
dB
Gain=+20dB to -20dB f=100Hz
MIDDLE
Maximum Boost Gain
GM_BST
18
20
22
dB
gain=+20dB f=1KHz
VIN=100mVrms
GM=20log (VOUT/VIN)
Maximum Cut Gain
GM_CUT
-22
-20
-18
dB
Gain=-20dB f=1KHz
VIN=2Vrms
GM=20log (VOUT/VIN)
Gain Set Error
GM_ERR
-2
0
+2
dB
Gain=+20dB to -20dB f=1KHz
TREBLE
Maximum Boost Gain
GT_BST
18
20
22
dB
Gain=+20dB f=10kHz
VIN=100mVrms
GT=20log (VOUT/VIN)
Maximum Cut Gain
GT_CUT
-22
-20
-18
dB
Gain=-20dB f=10kHz
VIN=2Vrms
GT=20log (VOUT/VIN)
Gain Set Error
GT_ERR
-2
0
+2
dB
Gain=+20dB to -20dB f=10kHz
FADER / SUBWOOFER
Maximum Boost Gain
GF_BST
13
15
17
dB
Fader=15dB
VIN=100mVrms
GF=20log(VOUT/VIN)
Maximum Attenuation＊
GF_MIN
－
-100
-90
dB
Fader = -∞dB
GF=20log(VOUT/VIN)
BW = IHF-A
Gain Set Error
GF_ERR
-2
0
+2
dB
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
THD+N=1%
BW=400Hz-30KHz
LOUDNESS
Maximum Gain
GL_MAX
17
20
23
dB
Gain 20dB
VIN=100mVrms
GL=20log(VOUT/VIN)
Gain Set Error
GL_ERR
-2
0
+2
dB
GAIN=+20dB to +1dB
Level
meter
Maximum Output Voltage
VL_MAX
2.8
3.1
3.5
V
Output Offset Voltage
VL_OFF
－
0
100
mV
VP-9690A(Average value detection, effective value display) filter by Matsushita Communication is used for * measurement.
Phase between input / output is same.
BD37524FS
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TSZ02201-0C2C0E100490-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
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TSZ22111・15・001
16.Dec.2015 Rev.001
Typical Performance Curves
-5
-4
-3
-2
-1
0
1
2
3
4
5
10
100
1k
10k
100k
Frequency [Hz]
Gain (dB)
Gain=0dB
Figure 1. Circuit Current (No Signal) vs Power
Supply Voltage
0
10
20
30
40
50
0 2 4 6 8 10
VCC[V]
Iq[mA]
Power Supply Voltage : VCC [V]
Figure 2. THD+N vs Output Voltage
0.001
0.01
0.1
1
10
0.001 0.01 0.1 1 10
Vout (V)
THD+N (%)
0.001
0.01
0.1
1
10
Vout
THD+N [%]
VIN [Vrms]
10kHz
1kHz
100Hz
Output Voltage : VOUT [Vrms]
Circuit Current (No Signal) : IQ [mA]
Vin[Vrms]
Figure 3. Gain vs Frequency
-25
-20
-15
-10
-5
0
5
10
15
20
25
10 100 1k 10k 100k
Frequency [Hz]
Figure 4. Bass Gain vs Frequency
Gain [dB]
BASS GAIN : -20dB to +20dB
/1dB step
fo : 60Hz Q : 0.5
BD37524FS
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TSZ02201-0C2C0E100490-1-2
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TSZ22111・15・001
16.Dec.2015 Rev.001
Typical Performance Curves – continued
Figure 7 .Middle Gain vs Freq
-25
-20
-15
-10
-5
0
5
10
15
20
25
10 100 1k 10k 100k
Q : 0.5/1/1.5/2
BASS GAIN : ±20dB
fo : 60Hz
Frequency [Hz]
Gain [dB]
Figure 6. Bass Q vs Frequency
-25
-20
-15
-10
-5
0
5
10
15
20
25
10 100 1k 10k 100k
Frequency [Hz]
Gain [dB]
MIDDLE GAIN :
-20dB to +20dB /1dB step
fo : 500Hz
Q : 0.75
Figure 5. Bass fo vs Frequency
-25
-20
-15
-10
-5
0
5
10
15
20
25
10 100 1k 10k 100k
Frequency [Hz]
fo : 60/80/100/120Hz
BASS GAIN : ±20dB
Q : 0.5
Gain [dB]
Figure 7. Middle Gain vs Frequency
-25
-20
-15
-10
-5
0
5
10
15
20
25
10 100 1k 10k 100k
Frequency [Hz]
Gain[dB]
fo : 500/1k/1.5k/2.5kHz
Figure 8. Middle fo vs Frequency
Gain [dB]
BD37524FS
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TSZ02201-0C2C0E100490-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
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TSZ22111・15・001
16.Dec.2015 Rev.001
-25
-20
-15
-10
-5
0
5
10
15
20
25
10 100 1k 10k 100k
MIDDLE GAIN :
±20dB
fo : 1kHz
Q : 0.75/1/1.25/1.5
Frequency [Hz]
Gain [dB]
Typical Performance Curves – continued
Gain[dB]
-25
-20
-15
-10
-5
0
5
10
15
20
25
10 100 1k 10k 100k
Frequency (Hz)
Gain (dB)
TREBLE GAIN:-20dB to +20dB
/1dB step
fo : 7.5kHz Q : 0.75
Frequency [Hz]
Gain [dB]
Figure 10. Treble Gain vs Frequency
-25
-20
-15
-10
-5
0
5
10
15
20
25
10 100 1k 10k 100k
fo : 7.5k/10k/12.5k/15kHz
TREBLE GAIN : ±20dB
Q : 0.75
Frequency [Hz]
Figure 11. Treble fo vs Frequency
Figure 9. Middle Q vs Frequency
Output Noise [µVrms]
-25
-20
-15
-10
-5
0
5
10
15
20
25
10 100 1k 10k 100k
Frequency (Hz)
Gain (dB)
Q : 0.75/1.25
TREBLE GAIN : ±20dB
fo : 7.5kHz
Gain [dB]
Figure 12. Treble Q vs Frequency
Frequency (Hz)
BD37524FS
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TSZ02201-0C2C0E100490-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
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TSZ22111・15・001
16.Dec.2015 Rev.001
Typical Performance Curves – continued
1
10
100
1000
-20 -15 -10 -5 0 5 10 15 20
Treble Gain [dB]
出力雑音電圧 [uVrms]
DIN-Audio IHF-A
Output Noise [µVrms]
Treble Gain [dB]
Figure 16. Output Noise vs Treble Gain
1
10
100
1000
-80 -70 -60 -50 -40 -30 -20 -10 010 20
Volume Gain[dB]
出力雑音電圧[uVrms]
Din-Audio IHF-A
Figure 13. Output Noise vs Volume Gain
Volume Gain [dB]
Output Noise [µVrms]
1
10
100
1000
-20 -15 -10 -5 0 5 10 15 20
Bass Gain [dB]
出力雑音電圧 [uVrms]
DIN-Audio IHF-A
Figure 14. Output Noise vs Bass Gain
Output Noise [µVrms]
Bass Gain [dB]
1
10
100
1000
-20 -15 -10 -5 0 5 10 15 20
Middle Gain [dB]
出力雑音電圧 [uVrms]
DIN-Audio IHF-A
Figure 15. Output Noise vs Middle Gain
Output Noise [µVrms]
Middle Gain [dB]
BD37524FS
10/31
TSZ02201-0C2C0E100490-1-2
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TSZ22111・15・001
16.Dec.2015 Rev.001
Typical Performance Curves – continued
-70
-60
-50
-40
-30
-20
-10
0
10 100 1k 10k 100k
Frequency (Hz)
Gain (dB)
Frequency [Hz]
Gain [dB]
Figure 17. CMRR vs Frequency
0.0
0.5
1.0
1.5
2.0
2.5
100 1000 10000 100000
出力負荷[ohm]
最大出力[Vrms]
RLOAD [ohm]
Output Voltage : VOUT [Vrms]
Figure 18. Output Voltage vs RLOAD
Figure 20. Advanced Switch 2
Figure 19. Advanced Switch 1
BD37524FS
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TSZ02201-0C2C0E100490-1-2
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TSZ22111・15・001
16.Dec.2015 Rev.001
Typical Performance Curves – continued
0
0.5
1
1.5
2
2.5
3
3.5
0 0.5 1 1.5 2 2.5 3
Input Voltage : VIN [Vrms]
Figure 21. Output Voltage vs Level Meter VIN
Output Voltage : VOUT [V]
BD37524FS
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TSZ02201-0C2C0E100490-1-2
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TSZ22111・15・001
16.Dec.2015 Rev.001
Timing Chart
Control Signal Specification
(1) Electrical Specifications and Timing for Bus Lines and I/O Stages
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
Fast-mode I2C-bus
Unit
Min
Max
1
SCL clock frequency
fSCL
0
400
kHz
2
Bus free time between a STOP and START condition
tBUF
1.3
－
μS
3
Hold time (repeated) START condition. After this period, the first
clock pulse is generated
tHD;STA
0.6
－
μS
4
LOW period of the SCL clock
tLOW
1.3
－
μS
5
HIGH period of the SCL clock
tHIGH
0.6
－
μS
6
Set-up time for a repeated START condition
tSU;STA
0.6
－
μS
7
Data hold time:
tHD;DAT
0.06(Note)
－
μS
8
Data set-up time
tSU;DAT
120
－
ns
9
Set-up time for STOP condition
tSU;STO
0.6
－
μS
All values are referred to VIH min and VIL max Levels (see Table 2).
(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
Symbol
Fast-mode devices
Unit
Min
Max
10
LOW level input voltage:
VIL
-0.3
+1
V
11
HIGH level input voltage:
VIH
2.3
5
V
12
Pulse width of spikes which must be suppressed by the input filter.
tSP
0
50
ns
13
LOW level output voltage: at 3mA sink current
VOL1
0
0.4
V
14
Input current each I/O pin with an input voltage between 0.4V and
4.5V.
II
-10
+10
μA
SDA
S
SCL
tLOW
tR
tHD;DAT
P
tHD;STA
tHIGH
tBUF
tF
tSU;DAT
tSU;STAT
tSU;STOT
tSP
tHD;STAT
Sr
P
Figure 23. A Command Timing Example in the I2C Data Transmission
ｔBUF
：4us
ｔHD;STA
：2us
ｔHD;DAT
：1us
ｔLOW
：3us
ｔHIGH
：1us
ｔSU;DAT
：1us
ｔSU;STO
：2us
SCL clock frequency：250kHz
SCL
SDA
tHD;STA
:2µs
tHD;DAT
:1µs
tSU;DAT
:1µs
tSU;STO
:2µs
tBUF
:4µs
tLOW
:3µs
tHIGH
:1µs
SCL
SDA
SCL clock frequency : 250 kHz
BD37524FS
13/31
TSZ02201-0C2C0E100490-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111・15・001
16.Dec.2015 Rev.001
(2) I2C BUS FORMAT
MSB LSB MSB LSB MSB LSB
S
Slave Address
A
Select Address
A
Data
A
P
1bit 8bit 1bit 8bit 1bit 8bit 1bit 1bit
S = Start condition (Recognition of start bit)
Slave Address = Recognition of slave address. The first 7 bits corresponds to slave address..
The least significant bit is “L” corresponds to write mode.
A = ACKNOWLEDGE bit (Recognition of acknowledgement)
Select Address = Select address for volume, bass and treble.
Data = Data on every volume and tone.
P = Stop condition (Recognition of stop bit)
(3) I2C BUS Interface Protocol
(a) Basic form
S
Slave Address
A
Select Address
A
Data
A
P
MSB LSB MSB LSB MSB LSB
(b) Automatic increment (Select Address increases (+1) according to the number of data.
S
Slave Address
A
Select Address
A
Data1
A
Data2
A
････
DataN
A
P
MSB LSB 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.
(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
P
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.
(4) Slave address
MSB LSB
A6
A5
A4
A3
A2
A1
A0
R/W
1
0
0
0
0
0
0
0
80H
BD37524FS
14/31
TSZ02201-0C2C0E100490-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111・15・001
16.Dec.2015 Rev.001
(5) Select Address & Data
Items
Select
Address
(hex)
MSB
Data
LSB
D7
D6
D5
D4
D3
D2
D1
D0
Initial setup 1
01
Advanced
switch
ON/OFF
0
Advanced switch time
of Input Gain/Volume
Tone/Fader/Loudnes
s
0
0
Advanced switch time
of Mute
Initial setup 2
02
LPF
Phase
Level
Meter
RESET
0
0
0
Subwoofer
LPF fc
LPF
Phase
Level
Meter
RESET
Initial setup 3
03
0
0
0
Loudness fo
0
0
1
Input Selector
05
0
0
0
Input selector
Input gain
06
Mute
ON/OFF
0
0
Input Gain
Volume gain
20
Volume Gain / Attenuation
Fader 1ch Front
28
Fader Gain / Attenuation
Fader 2ch Front
29
Fader Gain / Attenuation
Fader 1ch Rear
2A
Fader Gain / Attenuation
Fader 2ch Rear
2B
Fader Gain / Attenuation
Fader Subwoofer
2C
Fader Gain / Attenuation
Bass setup
41
0
0
Bass fo
0
0
Bass Q
Middle setup
44
0
0
Middle fo
0
0
Middle Q
Treble setup
47
0
0
Treble fo
0
0
0
Treble Q
Bass gain
51
Bass
Boost/
Cut
0
0
Bass Gain
Middle gain
54
Middle
Boost/
Cut
0
0
Middle Gain
Treble gain
57
Treble
Boost/
Cut
0
0
Treble Gain
Loudness Gain
75
0
Loudness HiCut
Loudness Gain
System Reset
FE
1
0
0
0
0
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.
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.
→01→02→03→05→06→20→28→29→2A→2B→2C
→41→44→47→51→54→57→75
BD37524FS
15/31
TSZ02201-0C2C0E100490-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111・15・001
16.Dec.2015 Rev.001
Select address 01 (hex)
Time
MSB
Advanced switch time of Mute
LSB
D7
D6
D5
D4
D3
D2
D1
D0
0.6msec
Advanced
Switch
ON/OFF
0
Advanced switch time
of Input gain/Volume
Tone/Fader/Loudness
0
0
0
0
1.0msec
0
1
1.4msec
1
0
3.2msec
1
1
Time
MSB
Advanced switch time of
Input gain/Volume/Tone/Fader/Loudness
LSB
D7
D6
D5
D4
D3
D2
D1
D0
4.7 msec
Advanced
Switch
ON/OFF
0
0
0
0
0
Advanced switch
Time of Mute
7.1 msec
0
1
11.2 msec
1
0
14.4 msec
1
1
Mode
MSB
Advanced switch ON/OFF
LSB
D7
D6
D5
D4
D3
D2
D1
D0
OFF
0
0
Advanced switch time
of Input gain/Volume
Tone/Fader/Loudness
0
0
Advanced switch
Time of Mute
ON
1
Select address 02(hex)
fc
MSB
Subwoofer LPF fc
LSB
D7
D6
D5
D4
D3
D2
D1
D0
OFF
LPF Phase
Level
Meter
RESET
0
0
0
0
0
0
55Hz
0
0
1
85Hz
0
1
0
120Hz
0
1
1
160Hz
1
0
0
Prohibition
Other setting
Mode
MSB
Level Meter RESET
LSB
D7
D6
D5
D4
D3
D2
D1
D0
HOLD
LPF Phase
0
0
0
0
Subwoofer LPF fc
RESET
1
Phase
MSB
LPF Phase
LSB
D7
D6
D5
D4
D3
D2
D1
D0
0°
0
Level
Meter
RESET
0
0
0
Subwoofer LPF fc
180°
1
Select address 03(hex)
f0
MSB
Loudness fo
LSB
D7
D6
D5
D4
D3
D2
D1
D0
250Hz
0
0
0
0
0
0
0
1
400Hz
0
1
800Hz
1
0
Prohibition
1
1
: Initial condition
BD37524FS
16/31
TSZ02201-0C2C0E100490-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111・15・001
16.Dec.2015 Rev.001
Select address 05(hex)
Mode
OUT
F1/R1
OUT
F2/R2
MSB
Input Selector
LSB
D7
D6
D5
D4
D3
D2
D1
D0
Initial
0
0
0
0
0
0
0
0
A
A1
A2
0
0
0
1
B
B1
B2
0
0
1
0
C diff
CP1
CP2
0
1
1
0
D
D1
D2
1
0
1
0
E
E1
E2
1
0
1
1
Input SHORT
1
0
0
1
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)
Gain
MSB
Input Gain
LSB
D7
D6
D5
D4
D3
D2
D1
D0
0dB
Mute
ON/OFF
0
0
0
0
0
0
0
1dB
0
0
0
0
1
2dB
0
0
0
1
0
3dB
0
0
0
1
1
4dB
0
0
1
0
0
5dB
0
0
1
0
1
6dB
0
0
1
1
0
7dB
0
0
1
1
1
8dB
0
1
0
0
0
9dB
0
1
0
0
1
10dB
0
1
0
1
0
11dB
0
1
0
1
1
12dB
0
1
1
0
0
13dB
0
1
1
0
1
14dB
0
1
1
1
0
15dB
0
1
1
1
1
16dB
1
0
0
0
0
17dB
1
0
0
0
1
18dB
1
0
0
1
0
19dB
1
0
0
1
1
20dB
1
0
1
0
0
Prohibition
1
1
0
1
1
：
：
：
：
：
1
1
1
1
1
Mode
MSB
Mute ON/OFF
LSB
D7
D6
D5
D4
D3
D2
D1
D0
OFF
0
0
0
Input Gain
ON
1
: Initial condition
BD37524FS
17/31
TSZ02201-0C2C0E100490-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111・15・001
16.Dec.2015 Rev.001
Select address 20, 28, 29, 2A, 2B, 2C (hex)
Gain & ATT
MSB
Vol, Fader Gain / Attenuation
LSB
D7
D6
D5
D4
D3
D2
D1
D0
Prohibition
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
：
：
：
：
：
：
：
：
0
1
1
1
0
0
0
0
15dB
0
1
1
1
0
0
0
1
14dB
0
1
1
1
0
0
1
0
13dB
0
1
1
1
0
0
1
1
：
：
：
：
：
：
：
：
：
-77dB
1
1
0
0
1
1
0
1
-78dB
1
1
0
0
1
1
1
0
-79dB
1
1
0
0
1
1
1
1
Prohibition
1
1
0
1
0
0
0
0
：
：
：
：
：
：
：
：
1
1
1
1
1
1
1
0
-∞dB
1
1
1
1
1
1
1
1
Select address 41(hex)
Q factor
MSB
Bass Q factor
LSB
D7
D6
D5
D4
D3
D2
D1
D0
0.5
0
0
Bass fo
0
0
0
0
1.0
0
1
1.5
1
0
2.0
1
1
fo
MSB
Bass fo
LSB
D7
D6
D5
D4
D3
D2
D1
D0
60Hz
0
0
0
0
0
0
Bass
Q factor
80Hz
0
1
100Hz
1
0
120Hz
1
1
Select address 44(hex)
Q factor
MSB
Middle Q factor
LSB
D7
D6
D5
D4
D3
D2
D1
D0
0.75
0
0
Middle fo
0
0
0
0
1.0
0
1
1.25
1
0
1.5
1
1
fo
MSB
Middle fo
LSB
D7
D6
D5
D4
D3
D2
D1
D0
500Hz
0
0
0
0
0
0
Middle
Q factor
1kHz
0
1
1.5kHz
1
0
2.5kHz
1
1
: Initial condition
BD37524FS
18/31
TSZ02201-0C2C0E100490-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111・15・001
16.Dec.2015 Rev.001
Select address 47 (hex)
Q factor
MSB
Treble Q factor
LSB
D7
D6
D5
D4
D3
D2
D1
D0
0.75
0
0
Treble fo
0
0
0
0
1.25
1
fo
MSB
Treble fo
LSB
D7
D6
D5
D4
D3
D2
D1
D0
7.5kHz
0
0
0
0
0
0
0
Treble
Q factor
10kHz
0
1
12.5kHz
1
0
15kHz
1
1
Select address 51, 54, 57 (hex)
Gain
MSB
Bass/ Middle/ Treble Gain
LSB
D7
D6
D5
D4
D3
D2
D1
D0
0dB
Bass/
Middle/
Treble
Boost
/Cut
0
0
0
0
0
0
0
1dB
0
0
0
0
1
2dB
0
0
0
1
0
3dB
0
0
0
1
1
4dB
0
0
1
0
0
5dB
0
0
1
0
1
6dB
0
0
1
1
0
7dB
0
0
1
1
1
8dB
0
1
0
0
0
9dB
0
1
0
0
1
10dB
0
1
0
1
0
11dB
0
1
0
1
1
12dB
0
1
1
0
0
13dB
0
1
1
0
1
14dB
0
1
1
1
0
15dB
0
1
1
1
1
16dB
1
0
0
0
0
17dB
1
0
0
0
1
18dB
1
0
0
1
0
19dB
1
0
0
1
1
20dB
1
0
1
0
0
Prohibition
1
0
1
0
1
：
：
：
：
：
1
1
1
1
0
1
1
1
1
1
Mode
MSB
Bass/ Middle/ Treble Boost/Cut
LSB
D7
D6
D5
D4
D3
D2
D1
D0
Boost
0
0
0
Bass/Middle/Treble Gain
Cut
1
: Initial condition
BD37524FS
19/31
TSZ02201-0C2C0E100490-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111・15・001
16.Dec.2015 Rev.001
Select address 75 (hex)
Mode
MSB
Loudness HiCut
LSB
D7
D6
D5
D4
D3
D2
D1
D0
HiCut1
0
0
0
Loudness Gain
HiCut2
0
1
HiCut3
1
0
HiCut4
1
1
Gain
MSB
Loudness Gain
LSB
D7
D6
D5
D4
D3
D2
D1
D0
0dB
0
Loudness HiCut
0
0
0
0
0
1dB
0
0
0
0
1
2dB
0
0
0
1
0
3dB
0
0
0
1
1
4dB
0
0
1
0
0
5dB
0
0
1
0
1
6dB
0
0
1
1
0
7dB
0
0
1
1
1
8dB
0
1
0
0
0
9dB
0
1
0
0
1
10dB
0
1
0
1
0
11dB
0
1
0
1
1
12dB
0
1
1
0
0
13dB
0
1
1
0
1
14dB
0
1
1
1
0
15dB
0
1
1
1
1
16dB
1
0
0
0
0
17dB
1
0
0
0
1
18dB
1
0
0
1
0
19dB
1
0
0
1
1
20dB
1
0
1
0
0
Prohibition
1
0
1
0
1
：
：
：
：
：
1
1
1
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
Limit
Unit
Conditions
Min
Typ
Max
Rise Time of VCC
tRISE
33
－
－
µsec
VCC rise time from 0V to 5V
VCC Voltage of Release
Power ON Reset
VPOR
－
4.1
－
V
(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
Mode
GND to 1.0V
MUTE ON
2.3V to VCC
MUTE OFF
Establish the voltage of MUTE in the condition to be defined.
BD37524FS
20/31
TSZ02201-0C2C0E100490-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111・15・001
16.Dec.2015 Rev.001
Application Information
1. Function and Specifications
Function
Specifications
Input selector
・Stereo 4 input ・Differential 1 input
Input gain
・+20dB to 0dB (1dB step)
・Possible to use “Advanced switch” for prevention of switching noise.
Mute
・Possible to use “Advanced switch” for prevention of switching noise.
Volume
・+15dB to -79dB (1dB step), -∞dB
・Possible to use “Advanced switch” for prevention of switching noise.
Bass
・+20dB to -20dB (1dB step) ・Q=0.5, 1, 1.5, 2 variable
・fo=60, 80, 100, 120Hz
・Possible to use “Advanced switch” at changing gain
Middle
・+20dB to -20dB (1dB step) ・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
Treble
・+20dB to -20dB (1dB step) ・Q=0.75, 1.25 variable
・fo=7.5k, 10k, 12.5k, 15kHz variable
・Possible to use “Advanced switch” when changing gain
Fader
・+15dB to -79dB(1dB step), -∞dB
・Possible to use “Advanced switch” for prevention of switching noise.
Loudness
・20dB to 0dB(1dB step) ・fo=250/400/800Hz
・Possible to use “Advanced switch” for prevention of switching noise.
LPF
・fc=55/85/120/160Hz, pass ・Phase shift (0°/180°)
Level meter
・I2C BUS control ・DC Output
BD37524FS
21/31
TSZ02201-0C2C0E100490-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111・15・001
16.Dec.2015 Rev.001
2. Volume / Fader Volume Attenuation Data
(dB)
D7
D6
D5
D4
D3
D2
D1
D0
(dB)
D7
D6
D5
D4
D3
D2
D1
D0
+15
0
1
1
1
0
0
0
1
-33
1
0
1
0
0
0
0
1
+14
0
1
1
1
0
0
1
0
-34
1
0
1
0
0
0
1
0
+13
0
1
1
1
0
0
1
1
-35
1
0
1
0
0
0
1
1
+12
0
1
1
1
0
1
0
0
-36
1
0
1
0
0
1
0
0
+11
0
1
1
1
0
1
0
1
-37
1
0
1
0
0
1
0
1
+10
0
1
1
1
0
1
1
0
-38
1
0
1
0
0
1
1
0
+9
0
1
1
1
0
1
1
1
-39
1
0
1
0
0
1
1
1
+8
0
1
1
1
1
0
0
0
-40
1
0
1
0
1
0
0
0
+7
0
1
1
1
1
0
0
1
-41
1
0
1
0
1
0
0
1
+6
0
1
1
1
1
0
1
0
-42
1
0
1
0
1
0
1
0
+5
0
1
1
1
1
0
1
1
-43
1
0
1
0
1
0
1
1
+4
0
1
1
1
1
1
0
0
-44
1
0
1
0
1
1
0
0
+3
0
1
1
1
1
1
0
1
-45
1
0
1
0
1
1
0
1
+2
0
1
1
1
1
1
1
0
-46
1
0
1
0
1
1
1
0
+1
0
1
1
1
1
1
1
1
-47
1
0
1
0
1
1
1
1
0
1
0
0
0
0
0
0
0
-48
1
0
1
1
0
0
0
0
-1
1
0
0
0
0
0
0
1
-49
1
0
1
1
0
0
0
1
-2
1
0
0
0
0
0
1
0
-50
1
0
1
1
0
0
1
0
-3
1
0
0
0
0
0
1
1
-51
1
0
1
1
0
0
1
1
-4
1
0
0
0
0
1
0
0
-52
1
0
1
1
0
1
0
0
-5
1
0
0
0
0
1
0
1
-53
1
0
1
1
0
1
0
1
-6
1
0
0
0
0
1
1
0
-54
1
0
1
1
0
1
1
0
-7
1
0
0
0
0
1
1
1
-55
1
0
1
1
0
1
1
1
-8
1
0
0
0
1
0
0
0
-56
1
0
1
1
1
0
0
0
-9
1
0
0
0
1
0
0
1
-57
1
0
1
1
1
0
0
1
-10
1
0
0
0
1
0
1
0
-58
1
0
1
1
1
0
1
0
-11
1
0
0
0
1
0
1
1
-59
1
0
1
1
1
0
1
1
-12
1
0
0
0
1
1
0
0
-60
1
0
1
1
1
1
0
0
-13
1
0
0
0
1
1
0
1
-61
1
0
1
1
1
1
0
1
-14
1
0
0
0
1
1
1
0
-62
1
0
1
1
1
1
1
0
-15
1
0
0
0
1
1
1
1
-63
1
0
1
1
1
1
1
1
-16
1
0
0
1
0
0
0
0
-64
1
1
0
0
0
0
0
0
-17
1
0
0
1
0
0
0
1
-65
1
1
0
0
0
0
0
1
-18
1
0
0
1
0
0
1
0
-66
1
1
0
0
0
0
1
0
-19
1
0
0
1
0
0
1
1
-67
1
1
0
0
0
0
1
1
-20
1
0
0
1
0
1
0
0
-68
1
1
0
0
0
1
0
0
-21
1
0
0
1
0
1
0
1
-69
1
1
0
0
0
1
0
1
-22
1
0
0
1
0
1
1
0
-70
1
1
0
0
0
1
1
0
-23
1
0
0
1
0
1
1
1
-71
1
1
0
0
0
1
1
1
-24
1
0
0
1
1
0
0
0
-72
1
1
0
0
1
0
0
0
-25
1
0
0
1
1
0
0
1
-73
1
1
0
0
1
0
0
1
-26
1
0
0
1
1
0
1
0
-74
1
1
0
0
1
0
1
0
-27
1
0
0
1
1
0
1
1
-75
1
1
0
0
1
0
1
1
-28
1
0
0
1
1
1
0
0
-76
1
1
0
0
1
1
0
0
-29
1
0
0
1
1
1
0
1
-77
1
1
0
0
1
1
0
1
-30
1
0
0
1
1
1
1
0
-78
1
1
0
0
1
1
1
0
-31
1
0
0
1
1
1
1
1
-79
1
1
0
0
1
1
1
1
-32
1
0
1
0
0
0
0
0
-∞
1
1
1
1
1
1
1
1
：Initial condition
BD37524FS
22/31
TSZ02201-0C2C0E100490-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111・15・001
16.Dec.2015 Rev.001
(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
I2CBUS
t
(25msec)
Wait time
detect
(
fin＝40Hz
RESET
START
HOLD
START
(RESET)
(HOLD)
80
1
0
02
40
80
02
00
LOUT [ V ]
BD37524FS
23/31
TSZ02201-0C2C0E100490-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111・15・001
16.Dec.2015 Rev.001
3. Application Circuit
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.
GND SDA SCL MUTE
10μ0.1μ
10μ
OUTF1 OUTF2 OUTR1 OUTR2 OUTS1 OUTS2
Single1 Single2 GND Isolation
VCC
10μ10μ10μ10μ10μ
2.2μ2.2μ2.2μ2.2μ2.2μ10μ2.2μ1μ1μ1μ1μ
LOUT
GND
VCC/2
★Volume/Mute
★3 Band P-EQ
(Tone control)
★Loudness
Fader★
Fader★
Fader★
Fader★
Fader★
LPF
★Input Gain
GND
ISO amp
Input selector (4 single-end and 1 stereo ISO)
14
100k100k100k100k250k
GND
ISO amp
250k250k250k250k250k250k
Level
meter
VCC
I2C BUS LOGIC
■Fader
Gain:+15dB～-79ｄB/1dB step
★no pop noise
■LPF
fc=55/85/120/160Hz
■Loudness
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～-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～-79dB/1dB step
★no pop noise
■Input Gain
Gain：+20dB～0dB/1dB step
★no pop noise
1 2 3 4 5 6 7 8 910 11 12
1324 23 22 21 20 19 18 17 16 15
10μ
Single3 Single4
Fader
Gain:+15dB to -79dB/1dB step
Loudness
Gain: 20dB to 0dB/1dB step
Gain: +20dB to -20dB/1dB
Gain: +15dB to -79dB/1dB step
Gain: +20dB to 0dB/1dB step
Unit
R : [Ω]
C : [F]
BD37524FS
24/31
TSZ02201-0C2C0E100490-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111・15・001
16.Dec.2015 Rev.001
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..
Figure 24. Temperature Derating Curve
Power dissipation values vary according to the board on which the IC is mounted.
SSOP-A24
1.5
1.0
0.5
0.0
0
25
50
75
100
125
150
1.0W
θja = 125 °C/W
85
Reference data
Ambient Temperature : Ta (°C)
Power Dissipation : Pd (W)
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)
(Note) Values are actual measurements and are not guaranteed.
BD37524FS
25/31
TSZ02201-0C2C0E100490-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111・15・001
16.Dec.2015 Rev.001
I/O Equivalent Circuits
Pin
No.
Pin
Name
Pin
Voltage
Equivalent Circuit
Pin Description
2
3
4
5
A1
A2
B1
B2
4.25
A terminal for signal input.
The input impedance is 100kΩ(typ).
6
7
8
9
10
11
12
CP1
CN
CP2
D1
D2
E1
E2
4.25
A terminal for signal input.
The input impedance is 250kΩ(typ).
13
MUTE
－
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.
16
17
18
19
20
OUTS1
OUTR2
OUTR1
OUTF2
OUTF1
4.25
A terminal for Fader and Subwoofer output.
The values in the pin explanation and input/output equivalent circuit are for reference purposes only. It is not a guaranteed value.
GND
VCC
100K
GND
VCC
250k
VCC
GND
VCC
GND
1.65V
BD37524FS
26/31
TSZ02201-0C2C0E100490-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111・15・001
16.Dec.2015 Rev.001
I/O Equivalent Circuits – continued
Pin
No.
Pin
Name
Pin
Voltage
Equivalent Circuit
Pin Description
21
VCC
8.5
Power supply terminal.
22
SCL
－
A terminal for clock input of I2C BUS
communication.
23
SDA
－
A terminal for data input of I2C BUS
communication.
24
GND
0
Ground terminal.
1
FIL
4.25
Voltage for reference bias of analog signal
system. The simple precharge circuit and
simple discharge circuit for an external
capacitor are built in.
The values in the pin explanation and input/output equivalent circuit are for reference purposes only. It is not a guaranteed value.
VCC
GND
50k
50k
VCC
GND
1.65V
VCC
GND
1.65V
BD37524FS
27/31
TSZ02201-0C2C0E100490-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111・15・001
16.Dec.2015 Rev.001
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.
BD37524FS
28/31
TSZ02201-0C2C0E100490-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111・15・001
16.Dec.2015 Rev.001
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.
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 RIN(Ω) inside the IC.
(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.)
N N
P+PN N
P+
P Substrate
GND
NP+N N
P+
NP
P Substrate
GND GND
Parasitic
Elements
Pin A
Pin A
Pin B Pin B
B C
EParasitic
Elements
GND
Parasitic
Elements
CB
E
Transistor (NPN)Resistor
N Region
close-by
Parasitic
Elements
0
A(f)
G〔dB〕
f〔Hz〕
C〔F〕
RIN
〔Ω〕
INPUT
SSH
2
IN
2
IN
fCR21 fCR2
fA
BD37524FS
29/31
TSZ02201-0C2C0E100490-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111・15・001
16.Dec.2015 Rev.001
Ordering Information
B
D
3
7
5
2
4
F
S
-
E 2
Part Number
Package
FS: SSOP-A24
Packaging and forming specification
E2: Embossed tape and reel
Marking Diagram
SSOP-A24(TOP VIEW)
BD37524FS
Part Number Marking
LOT Number
1PIN MARK
Datasheet
Datasheet
Notice-PGA-E Rev.00
2
© 2015 ROHM Co., Ltd. All rights reserved.
Notice
Precaution on using ROHM Products
1. Our Products are designed and manufactured for applicatio n in ordinar y elec tronic eq uipm ents (such as AV equipment ,
OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you
intend to use our Products in devices requiring extremely high reliability (such as medical equipment (Note 1), transport
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 b y you or third parties arisin g from the use of an y ROHM’s Prod ucts for Specific
Applications.
(Note1) Medical Equipment Classification of the Specific Applications
JAPAN USA EU CHINA
CLASSⅢ CLASSⅢ CLASSⅡb 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 d esign against the physical injur y, damage to any property, which
a failure or malfunction of our Products may cause. T he 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, reliabili ty, 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 sunlig ht 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 comp onents, 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 flu x (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 radi ation-proof design.
5. Please verify and confirm ch aracteristics 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 dependin g on ambient temperature. When used in sealed area, confirm that it is the us e in
the range that does not exceed the maximum junction temperature.
8. Confirm that operation temperature is within the specified range described i n the product specification.
9. ROHM shall not be in any way responsible or liable for failure induced under deviant condi tion from what is defined in
this document.
Precaution for Mounting / Circuit board design
1. When a highly active halogen ous (chlori ne, bromine, etc.) flu x is used, the residue of flux may negativel y 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 represe ntative in advance.
For details, please refer to ROHM Mounting specification
Datasheet
Datasheet
Notice-PGA-E Rev.00
2
© 2015 ROHM Co., Ltd. All rights reserved.
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 you r own indepen dent verificatio n and judgmen t 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 t ake special care under dry condit ion (e.g. Grounding of human body / equipment / sol der iron,
isolation from charged objects, setting of Ionizer, friction prevention and temperatur e / humidity control).
Precaution for Storage / Transportati on
1. Product performance and soldered connections may deteriorate if the Products are store d in the places where:
[a] the Products are exposed to sea winds or corrosive gases, including Cl2, H 2S, 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 und er ROHM recommended storage condition, solder ability of products out of recommende d storage time period
may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is
exceeding the recommen de d 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 s t ress applied when dropping of a carton.
4. Use Products within the s pecified time after opening a humidity barrier ba g. 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 pl ease dispose them properly using an authorized industry waste compan y.
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 foregoi ng information or data will not infringe any int ellectual 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
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third parties with respect to the Products or the information contained i n this document. Provide d, 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.
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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 b ut 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.
DatasheetDatasheet
Notice – WE Rev.001
© 2015 ROHM Co., Ltd. All rights reserved.
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.
