ROHM BH3541F

Speaker / Headphone Amplifier Series
Stereo Headphone
Amplifiers
BH3541F, BH3544F, BH3547F, BH3548F
No.09077EAT01
●Description
BH3541F, BH3544F, BH3547F, BH3548F is headphone amplifiers suitable for portable products.
BH3541F has a fixed gain of 0 dB and BH3544F, BH3547F, BH3548F has a fixed gain of 6 dB.
External resistors for gain setting are not needed. Package of BH3541F, BH3544F, BH3547F, BH3548F is pin-to-pin
compatible (SOP8), enable to replace each other easily.
BH3541F, BH3544F, BH3547F, BH3548F also has mute functions that make it easy to prevent pop noise when power
supply turns on/off. Moreover, thermal shutdown function is built-in.
BH3541F, BH3544F, BH3547F can drive 16/32Ω load, BH3548F can drive 8/16/32Ω. So, BH3548F is suitable for 8Ω
receiver.
●Features
1) Built-in mute function for preventing pop noise when power supply turns on/off
2) Built-in thermal shutdown function
3) BH3541F, BH3544F, BH3547F, BH3548F are pin-to-pin compatible
4) SOP8 small package
●Applications
TV, Desktop PC, Notebook PC, Camcorder and other equipment having headphone output
●Line up
Part No.
BH3541F
Supply voltage
BH3547F
BH3548F
Unit
+2.8 ～ +6.5
+4.5 ～ +5.5
+4.0 ～ +5.5
V
7.0
3.7
6.5
mA
Quiescent current
Amplifier gain
BH3544F
0
Output [RL=16Ω]
6
62
77
load impedance
Operating temperature range
dB
62
mW
16 / 32
8/16/32
Ω
-25 ～ +75
-40 ～ +85
℃
●Absolute maximum ratings（Ta=25°C）
Parameter
Applied voltage
Power dissipation
Storage temperature
*1
Limit
Symbol
BH3541F,BH3544F,BH3547F,BH3548F
7.0
550 *1
-55～+125
VCC
Pd
Tstg
Unit
V
mW
°C
Derating is done at 5.5mW/°C above Ta=25°C. (When mounted on a 70mm×70mm×1.6mm PCB board, FR4)
●Operating conditions (Ta=25°C)
Parameter
Symbol
BH3541F,BH3544F
BH3547F
BH3548F
Unit
Supply voltage
VCC
+2.8 ～ +6.5
+4.5 ～ +6.5
+4.0 ～ +5.5
V
Temperature Range
Topr
-40 ～ +85
℃
＊
-25～+75
These product are not designed for protection against radioactive rays.
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1/8
2009.07 - Rev.A
Technical Note
BH3541F, BH3544F, BH3547F, BH3548F
●Electrical characteristics (Unless otherwise noted, Ta=25°C,VCC=5V,RL=32Ω,f=1kHz,BW=400～30kHz
BH3541F : VIN=0dBV, BH3544F, BH3547F, BH3548F : VIN =-6dBV)
TYP.
Parameter
Symbol
Unit
Conditions
BH3541F BH3544F BH3547F BH3548F
Quiescent current
IQ
7
3.7
6.5
mA
VIN=0Vrms
Mute pin control voltage H
VTMH
1.6<
V
Mute OFF
Mute pin control voltage L
VTML
<0.3
V
Mute ON
Gain
Gain difference between
channels
Total harmonic distortion
GVC
0
6
0
△GVC
dB
-
dB
-
THD
0.02
0.05
0.02
%
Rated output 1
PO1
31
46
31
mW
Rated output 2
PO2
62
77
62
mW
Rated output 3
PO3
120
mW
Output noise voltage
VNO
-93
-90
dBV
-87
Channel separation
CS
dB
Rg=0Ω
Mute attenuation
ATT
-80
dB
Rg=0Ω
Ripple rejection
RR
-57
dB
fRR=100Hz,VRR=-20dBV
Input resistance
Rin
180
90
-90
BW=20～20kHz
RL=32Ω,THD<0.1%
(BH3541F,BH3544F,BH3548F)
RL=32Ω,THD＜0.3%
(BH3547F)
RL=16Ω,THD<0.1%
(BH3541F,BH3544F,BH3548F)
RL=16Ω,THD＜0.5%
(BH3547F)
RL=8Ω,THD＜0.25%
(BH3548F)
BW=20～20kHz,Rg=0Ω
kΩ
-
●Reference data
BH3541F/BH3544F
Fig. 1 Quiescent current vs.
power supply voltage
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BH3541F/BH3544F
Fig. 2 in DC current vs.
power supply voltage
2/8
BH3541F/BH3544F
Fig. 3 Output voltage vs.
Mute control voltage
2009.07 - Rev.A
Technical Note
BH3541F, BH3544F, BH3547F, BH3548F
●Reference data (Continued)
Fig. 4 Voltage gain vs. frequency
BH3541F/BH3544F
Fig. 7 Total harmonic distortion vs.
output voltage (3)
10
BH3541F/BH3544F
Ta25C
RL32
VCC5V
1
f10kHZ
0.1
f1kHZ
0.01
f100HZ
0.001
40
30
20
10
0
10
Ta25C
RL32
VCC3V
1
f10kHZ
0.1
f1kHZ
0.01
0.001
40
f100HZ
30
20
10
0
10
OUTPUT VOLTAGE: VO (dBV)
Fig. 5 Total harmonic distortion vs.
output voltage (1)
Fig. 6 Total harmonic distortion vs.
output voltage (2)
BH3541F/BH3544F
Fig. 8 Total harmonic distortion vs.
output voltage (4)
BH3541F/BH3544F
Fig. 10 MUTE attenuation vs. frequency
Fig. 11 Ripple rejection vs. frequency
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10
OUTPUT VOLTAGE :VO (dBV)
BH3541F/BH3544F
© 2009 ROHM Co., Ltd. All rights reserved.
TOTAL
DISTORTION
: THD
(%) (%)
TOTALHARMONIC
HARMONIC
DISTORTION
: THD
BH3541F/BH3544F
TOTAL HARMONIC
DISTORTION
: THD
(%)
TOTAL
HARMONIC
DISTORTION
: THD
(%)
BH3541F/BH3544F
3/8
BH3541F/BH3544F
Fig. 9 Channel separation vs.
frequency
BH3541F/BH3544F
Fig. 12 Ripple rejection vs.
power supply voltage
2009.07 - Rev.A
Technical Note
BH3541F, BH3544F, BH3547F, BH3548F
●Block diagram
V CC
O UT2
BIA S
IN2
8
7
6
5
B IAS
180 k
(90 k)
0d B
(6d B)

180 k
(9 0k)
TS D

0 dB
(6d B)
MUTE
1
2
3
4
OU T1
MUTE
I N1
G ND
( ) are BH3544F, BH3547F, BH3548F values.
Fig. 13
●Measurement circuit
SW7
1
32
16
330μ
2
V V7AC
SW5
R5
1μ
1
47μ
CVCC
2
SW8B
10μ
A IQ
1
2
VCC
BIAS
OUT2
8
7
IN2
6
VIN2
5
BIAS
SWBA
180k
(90k)
0dB
(6dB)
+
VRR
180k
(90k)
TSD
VCC
+
0dB
(6dB)
MUTE
32
16
SW1
1
2
1
330μ
V1AC V
2
OUT1
3
MUTE
VTM
4
IN1
R3
GND
SW3
1μ
1
2
VIN1
( ) are BH3544F, BH3547F, BH3548F values.
Fig. 14
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4/8
2009.07 - Rev.A
Technical Note
BH3541F, BH3544F, BH3547F, BH3548F
●Terminal Equivalent Circuit / Description
Pin
No.
Pin
Name
I /O
Pin voltage
Equivalent circuit
BH3544F,BH3547F,BH3548F
VCC
1
OUT1
O
7
OUT2
2.1V
(VCC=5V)
VCC
1
Output pin
1
7
7
10k
10k
VCC
VCC
2
MUTE
I
0.1V
(When open)
2
200k
VCC
VCC
IN1
I
5
IN2
2.1V
(VCC=5V)
3
3
5
I/O
2.1V
(VCC=5V)
90k
BIAS
70k
60k
6
Bias pin
VCC
VCC
BIAS
Input pin
5
180k
BIAS
6
Mute control pin
Mute on：Hi
Mute off：Lo (open)
2
190k
3
Function
BH3547F
ＢＩＡＳ
6
ＢＩＡＳ
64k
60k
(Since the 47 µF
externally attached
capacitor also serves
as the time constant for
pop noise
countermeasures,
evaluate adequately
when changing it.)
4
GND
I
-
-
-
GND pin
8
VCC
I
-
-
-
Power supply pin
※The figure in the pin explanation and input/output equivalent circuit is reference value, it doesn’t guarantee the value.
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5/8
2009.07 - Rev.A
Technical Note
BH3541F, BH3544F, BH3547F, BH3548F
●Application circuit
C7
330 µ
+
VCC
C8
10 µ
VCC
+
+
BIAS
OUT2
8
C6
47µ
7
R5
C5
1µ
VIN2
IN2
6
5
BIAS
180k
(90k)
0dB
(6dB)
180k
(90k)
TSD
0dB
(6dB)
MUTE
C1
330µ
+
1
2
OUT1
4
IN1
GND
C3
1µ
VMUTE
H : Active
L : Mute
3
MUTE
R2 100k
C2
1µ
VIN1
R3
( ) are BH3544F, BH3547F, BH3548F values.
Fig. 15
●Description of external components.
1) Input coupling capacitors (C3, C5)
These are determined according to the lower cutoff frequency fc. Moreover, since lowering the capacitance can cause
the occurrence of pop noise, when changing this, determine it after adequate checking.
Since the input impedance of the BH3541F is 180kΩ and that of the BH3544F,BH3547F,BH3548F is 90kΩ, these are
found by the expressions below, although drift, temperature characteristics, and other considerations are necessary.
(Layered ceramic capacitors are recommended.)
C3(C5)=1/(2π×180kΩ×fc) [BH3541F]
C3(C5)=1/(2π× 90kΩ×fc)
[BH3544Ｆ,BH3547F,BH3548F]
2) Bias capacitor (C6)
When VCC=5V, 47μF is recommended. Since lowering the capacitance too much can cause worsening of electrical
characteristics or the occurrence of pop noise, when changing this, determine it after checking this adequately.
3) Mute pin pop noise countermeasures (R2, C2)
Since the BH3541F,BH3544F,BH3548F has an impedance of 190kΩ against GND and the BH3547F has 200kΩ, it may
be impossible to cancel mute mode if R2 is made too large.
4) Output coupling capacitors (C1, C7)
These are determined by the lower cutoff frequency. If RL is the output load resistance (assuming a resistance RX is
put in for output protection or current restriction), these are found by the expression below.
C1(C7)=1/(2π×(RL+Rｘ)× fc)
5) Input gain adjustment resistances (R3, R5) (BH3544F,BH3547F)
Externally attached resistances (R3, R5) make input gain adjustment possible. The gain found by the expression
below can be set.
GVC=6+20log(90kΩ/(90kΩ+R3[R5])) [dB]
When input gain is not accommodated, these resistors have no use.
●Notes for use
1) Numbers and data in entries are representative design values and are not guaranteed values of the items.
2) Although we are confident in recommending the sample application circuits, carefully check their characteristics further
when using them. When modifying externally attached component constants before use, determine them so that they
have sufficient margins by taking into account variations in externally attached components and the Rohm LSI, not only
for static characteristics but also including transient characteristics.
3) Absolute maximum ratings
If applied voltage, operating temperature range, or other absolute maximum ratings are exceeded, the LSI may be
damaged. Do not apply voltages or temperatures that exceed the absolute maximum ratings. If you think of a case in
which absolute maximum ratings are exceeded, enforce fuses or other physical safety measures and investigate how
not to apply the conditions under which absolute maximum ratings are exceeded to the LSI.
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6/8
2009.07 - Rev.A
Technical Note
BH3541F, BH3544F, BH3547F, BH3548F
4) GND potential
Make the GND pin voltage such that it is the lowest voltage even when operating below it. Actually confirm that the
voltage of each pin does not become a lower voltage than the GND pin, including transient phenomena.
5) Thermal design
Perform thermal design in which there are adequate margins by taking into account the allowable power dissipation in
actual states of use.
6) Shorts between pins and misinstallation
When mounting the LSI on a board, pay adequate attention to orientation and placement discrepancies of the LSI.
If it is misinstalled and the power is turned on, the LSI may be damaged. It also may be damaged if it is shorted by a
foreign substance coming between pins of the LSI or between a pin and a power supply or a pin and a GND.
7) Operation in strong magnetic fields
Adequately evaluate use in a strong magnetic field, since there is a possibility of malfunction.
8) Pop noise countermeasures
In order to prevent the pop noise that occurs when the power supply turns ON or OFF, make the rise and fall with
reference to the timing diagram shown below.
1)BH3541F/ BH3544F/ BH3548F
Rise time
A
VCC
Rise time
PLAY period
B
A
C
OUT
MUTE
Fig. 16
(A)：Mute period (Use as pop noise countermeasure when power supply turns ON/OFF by makingVMUTE=Lo.)
(B)：Mute cancellation period (This has a time constant because it is used by the externally attached C2 and R2 as
a pop noise countermeasure on mute cancellation, so be careful of the timing.)
(C)：Mute start time (As on cancellation, this has a time constant.)
2)BH3547F
(MUTE period)
（Rise time）
(PLAY period)
(Fall period)
（B）
VCC
（A）
Vmute
SG
(Input Signal)
OUT
Fig. 17
(A)：Before VCC rise (or at the same time as VCC) make mute cancelled (VMUTE＝Hi).
(B)：Soft mute period (This time can be set by externally attached R2 and C2)
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7/8
2009.07 - Rev.A
Technical Note
BH3541F, BH3544F, BH3547F, BH3548F
●Ordering part number
B
H
3
Part No.
5
4
1
F
Part No.
3541
3544
3547
3548
-
E
Package
F: SOP8
2
Packaging and forming specification
E2: Embossed tape and reel
SOP8
<Tape and Reel information>
6
5
0.3MIN
7
4.4±0.2
6.2±0.3
8
+6°
4° −4°
1 2
3
0.9±0.15
5.0±0.2
(MAX 5.35 include BURR)
Tape
Embossed carrier tape
Quantity
2500pcs
Direction
of feed
E2
The direction is the 1pin of product is at the upper left when you hold
( reel on the left hand and you pull out the tape on the right hand
)
4
0.595
1.5±0.1
+0.1
0.17 -0.05
0.11
S
1.27
0.42±0.1
1pin
Reel
(Unit : mm)
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© 2009 ROHM Co., Ltd. All rights reserved.
8/8
Direction of feed
∗ Order quantity needs to be multiple of the minimum quantity.
2009.07 - Rev.A
Notice
Notes
No copying or reproduction of this document, in part or in whole, is permitted without the
consent of ROHM Co.,Ltd.
The content specified herein is subject to change for improvement without notice.
The content specified herein is for the purpose of introducing ROHM's products (hereinafter
"Products"). If you wish to use any such Product, please be sure to refer to the specifications,
which can be obtained from ROHM upon request.
Examples of application circuits, circuit constants and any other information contained herein
illustrate the standard usage and operations of the Products. The peripheral conditions must
be taken into account when designing circuits for mass production.
Great care was taken in ensuring the accuracy of the information specified in this document.
However, should you incur any damage arising from any inaccuracy or misprint of such
information, ROHM shall bear no responsibility for such damage.
The technical information specified herein is intended only to show the typical functions of and
examples of application circuits for the Products. ROHM does not grant you, explicitly or
implicitly, any license to use or exercise intellectual property or other rights held by ROHM and
other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the
use of such technical information.
The Products specified in this document are intended to be used with general-use electronic
equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices).
The Products specified in this document are not designed to be radiation tolerant.
While ROHM always makes efforts to enhance the quality and reliability of its Products, a
Product may fail or malfunction for a variety of reasons.
Please be sure to implement in your equipment using the Products safety measures to guard
against the possibility of physical injury, fire or any other damage caused in the event of the
failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM
shall bear no responsibility whatsoever for your use of any Product outside of the prescribed
scope or not in accordance with the instruction manual.
The Products are not designed or manufactured to be used with any equipment, device or
system which requires an extremely high level of reliability the failure or malfunction of which
may result in a direct threat to human life or create a risk of human injury (such as a medical
instrument, transportation equipment, aerospace machinery, nuclear-reactor controller,
fuel-controller or other safety device). ROHM shall bear no responsibility in any way for use of
any of the Products for the above special purposes. If a Product is intended to be used for any
such special purpose, please contact a ROHM sales representative before purchasing.
If you intend to export or ship overseas any Product or technology specified herein that may
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obtain a license or permit under the Law.
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More detail product informations and catalogs are available, please contact us.
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R0039A