Headphone Amplifiers
Standard
Headphone Amplifiers
BH3544F,BH3547F,BH3548F
No.15102EDT02
●Description
BH3544F, BH3547F, BH3548F are headphone amplifiers suitable for portable products. BH3544F, BH3547F, BH3548F has
a fixed gain of 6 dB. External resistors for gain setting are not needed. Package of BH3544F, BH3547F, BH3548F is
pin-to-pin compatible (SOP8), enable to replace each other easily.
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.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) 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.
Supply voltage
Quiescent current
Amplifier gain
Output [R
L
=16Ω]
load impedance
Operating temperature range
●Absolute
maximum ratings(Ta=25°C)
Parameter
Applied voltage
Power dissipation
Storage temperature
*1
BH3544F
+2.8
½
+6.5
7.0
BH3547F
+4.5
½
+6.5
3.7
6
77
16 / 32
-25
½
+75
BH3548F
+4.0
½
+5.5
6.5
62
8/16/32
-40
½
+85
Unit
V
mA
dB
mW
Ω
℃
62
Symbol
VCC
Pd
Tstg
Ratings
BH3544F,BH3547F,BH3548F
7.0
550
*1
Unit
V
mW
°C
-55½+125
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
Supply voltage
Temperature Range
Symbol
VCC
Topr
Limits
BH3544F
+2.8
½
+6.5
-25½+75
BH3547F
+4.5
½
+6.5
BH3548F
+4.0
½
+5.5
-40
½
+85
Unit
V
℃
* These product are not designed for protection against radioactive rays.
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
1/8
2015.06 - Rev.D
BH3544F,BH3547F,BH3548F
Technical Note
●Electrical
characteristics (Unless otherwise noted, Ta=25°C,VCC=5V,RL=32Ω,f=1kHz,BW=400½30kHz, VIN =-6dBV)
Limits(TYP.)
Parameter
Symbol
Unit
Conditions
BH3544F
BH3547F
BH3548F
Quiescent current
Mute pin control voltage H
Mute pin control voltage L
Gain
Gain difference between
channels
Total harmonic distortion
Rated output 1
I
Q
V
TMH
V
TML
G
VC
ΔG
VC
THD
P
O1
0.02
31
7
3.7
1.6<
<0.3
6
0
0.05
46
0.02
31
6.5
mA
V
V
dB
dB
%
mW
BW=20½20kHz
R
L
=32Ω,THD<0.1%
(BH3541F,BH3544F,BH3548F)
R
L
=32Ω,THD＜0.3%
(BH3547F)
R
L
=16Ω,THD<0.1%
(BH3541F,BH3544F,BH3548F)
R
L
=16Ω,THD＜0.5%
(BH3547F)
R
L
=8Ω,THD＜0.25%
(BH3548F)
BW=20½20kHz,Rg=0Ω
Rg=0Ω
Rg=0Ω
f
RR
=100Hz,V
RR
=-20dBV
-
V
IN
=0Vrms
Mute OFF
Mute ON
-
-
Rated output 2
Rated output 3
Output noise voltage
Channel separation
Mute attenuation
Ripple rejection
Input resistance
P
O2
P
O3
V
NO
CS
ATT
RR
Rin
62
-
77
62
120
mW
mW
dBV
-93
-90
-87
-80
-57
90
-90
dB
dB
dB
kΩ
●Reference
data
BH3544F
BH3544F
BH3544F
Fig. 1 Quiescent current vs.
power supply voltage
Fig. 2 in DC current vs.
power supply voltage
Fig. 3 Output voltage vs.
Mute control voltage
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
2/8
2015.06 - Rev.D
BH3544F,BH3547F,BH3548F
●Reference
data (Continued)
BH3544F
TOTAL
HARMONIC DISTORTION : THD
TOTAL
HARMONIC DISTORTION : THD (%)
(%)
Technical Note
BH3544F
10
TOTAL HARMONIC DISTORTION : THD (%)
(%)
TOTAL HARMONIC DISTORTION : THD
BH3544F
10
Ta½25C
R
L
½32
V
CC
½3V
f½10kH
Z
Ta½25C
R
L
½32
V
CC
½5V
1
f½10kH
Z
1
0.1
f½1kH
Z
0.1
f½1kH
Z
0.01
f½100H
Z
0.001
40
0.01
f½100H
Z
30
20
10
0
10
0.001
40
30
20
10
OUTPUT VOLTAGE :
O
(dBV)
V
0
10
OUTPUT VOLTAGE V
O
(dBV)
:
Fig. 4 Voltage gain vs. frequency
Fig. 5 Total harmonic distortion vs.
output voltage (1)
Fig. 6 Total harmonic distortion vs.
output voltage (2)
BH3544F
BH3544F
BH3544F
Fig. 7 Total harmonic distortion vs.
output voltage (3)
Fig. 8 Total harmonic distortion vs.
output voltage (4)
Fig. 9 Channel separation vs.
frequency
BH3544F
BH3544F
BH3544F
Fig. 10 MUTE attenuation vs. frequency
Fig. 11 Ripple rejection vs. frequency
Fig. 12 Ripple rejection vs.
power supply voltage
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
3/8
2015.06 - Rev.D
BH3544F,BH3547F,BH3548F
●Block
diagram
VCC
8
OUT2
7
BIAS
6
BIAS
90k
6dB
TSD
6dB
MUTE
1
OUT1
2
MUTE
3
IN1
4
GND
IN2
5
Technical Note
90k
Fig. 13
●Measurement
circuit
32
SW7
1
330μ
16
2
V V
7AC
R5
CV
CC
47μ
2
VCC
8
OUT2
7
BIAS
6
IN2
5
1μ
1
SW5
SW8B
A IQ
10μ
V
IN
2
1
2
SWBA
6dB
TSD
BIAS
90k
V
RR
+
90k
6dB
V
CC
MUTE
32
SW1
1
1
330μ
OUT1
V
TM
2
MUTE
+
3
IN1
4
GND
SW3
1μ
1
2
V
IN
1
16
2
V
1AC
V
R3
Fig. 14
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
4/8
2015.06 - Rev.D
BH3544F,BH3547F,BH3548F
●Terminal
Equivalent Circuit / Description
Pin
No.
Pin
Name
Equivalent circuit
BH3544F, BH3548F
BH3547F
Technical Note
I /O
Pin voltage
Function
VCC
VCC
1
7
OUT1
OUT2
O
2.1V
(VCC=5V)
1
7
10k
1
7
10k
Output pin
VCC
VCC
2
MUTE
I
0.1V
(When open)
2
190k
2
200k
Mute control pin
Active:Hi
Mute:Lo (open)
VCC
VCC
3
5
IN1
IN2
I
2.1V
(VCC=5V)
3
5
BIAS
90k
3
5
BIAS
90k
Input pin
VCC
VCC
Bias pin
(Since the 47 µF
externally attached
capacitor also serves
as the time constant for
pop noise
countermeasures,
evaluate adequately
when changing it.)
6
BIAS
I/O
2.1V
(VCC=5V)
6
60k
BIAS
60k
6
70k
BIAS
64k
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.
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
5/8
2015.06 - Rev.D
京公网安备 11010802033920号
EEWORLD
