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Número de pieza BD88420GUL
Descripción Coupling Capacitorless Headphone Amplifiers
Fabricantes ROHM Semiconductor 
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Headphone Amplifiers
Coupling Capacitorless
Headphone Amplifiers
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
No.11102EAT04
Description
BD88xxxGUL is output coupling capacitorless headphone amplifier. This IC has a negative voltage generator of regulated
type built-in and generates the direct regulated negative voltage from the supply voltage. It is possible to drive headphones
in a ground standard with both voltage of the positive voltage (+2.4V) and the negative voltage (-2.4V). Therefore a
large-capacity output coupling capacitor becomes needless and can reduce a cost, a board area, and the height of the part.
In addition, there is not the signal decrement by the low range to happen by output coupling capacitor and output load
impedance and can output a rich low tone.
Features
1) 2.4V to 5.5V Single-Supply Operation
2) No Bulky DC-Blocking Capacitors Required
3) No Degradation of Low-Frequency Response Due to Output Capacitors
4) Ground-Referenced Outputs
5) Gain setting
BD88400GUL: Variable gain with external resistors
BD88410GUL: -1.0V/V
BD88415GUL: -1.5V/V
BD88420GUL: -2.0V/V
6) Low THD+N
7) Low Supply Current
8) Integrated Negative Power Supply
9) Integrated Short-Circuit and Thermal-Overload Protection
10) Small package
VCSP50L2 (2.1mm x 2.1mm)
Applications
Mobile Phones, Smart Phones, PDAs, Portable Audio Players, PCs, TVs, Digital Cameras, Digital Video Cameras,
Electronic Dictionaries, Voice Recorders, Bluetooth Head-sets, etc
Line up
Type
BD88400GUL
BD88410GUL
BD88415GUL
Supply Supply
Voltage Current
[V] [mA]
Gain
[V/V]
Variable gain
with external
resister
Maximum
Output Power
[mW]
THD+N
[%]
Noise
Voltage
[µVrms]
PSRR
[dB]
2.45.5
2.0
(No signal)
-1.0
-1.5
80 0.006
(VDD=3.3V,RL=16(VDD=3.3V,RL=16
THD+N1%,f=1kHz) Po=10mW,f=1kHz)
10
-80
(f=217Hz)
Package
VCSP50L2
(2.1mm x 2.1mm)
BD88420GUL
-2.0
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
1/25
2011.03 – Rev. A

1 page




BD88420GUL pdf
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
Electrical characteristic curves – BD88415GUL (Reference data)
0 VDD=2.4V
f=1kHz
-20 BPF
RL=32Ω
-40
RL=16Ω
-60
-80
-100
-120
-120 -100 -80 -60 -40 -20
0
Input Voltage [dBV]
Fig.13 Output Voltage vs.
Input Voltage (VDD=2.4V)
10
8
6 RL=16Ω
4
2
0 RL=32Ω
-2 VDD=2.4V
-4 Po=10mW
-6
RL=16Ω
Input coupling
-8 capacitor = 1.0uF
-10
10 100 1k
10k 100k
Frequency [Hz]
Fig.16 Gain vs. Frequency
(VDD=2.4V)
100
10
1 In phase
0.1 VDD=2.4V
20kHz-LPF
0.01 f=1kHz
Stereo
RL=16Ω
0.001
1n 100n
Out of phase
10u 1m 100m
Output Power [W]
Fig.19 THD+N vs. Output
Power (VDD=2.4V, RL=16Ω)
100
10
1 In phase
0.1 VDD=2.4V
20kHz-LPF
0.01 f=1kHz
Stereo
RL=32Ω
0.001
1n 100n
Out of phase
10u 1m 100m
Output Power [W]
Fig.22 THD+N vs. Output
Power (VDD=2.4V, RL=32Ω)
0 VDD=3.3V
f=1kHz
-20 BPF
RL=32Ω
-40
RL=16Ω
-60
-80
-100
-120
-120 -100 -80 -60 -40 -20
0
Input Voltage [dBV]
Fig.14 Output Voltage vs.
Input Voltage (VDD=3.3V)
10
8
6 RL=16Ω
4
2
0 RL=32Ω
-2 VDD=3.3V
-4 Po=10mW
-6
RL=16Ω
Input coupling
-8 capacitor = 1.0uF
-10
10 100 1k
10k 100k
Frequency [Hz]
Fig.17 Gain vs. Frequency
(VDD=3.3V)
100
10
1 In phase
0.1 VDD=3.3V
20kHz-LPF
0.01 f=1kHz
Stereo
RL=16Ω
0.001
1n 100n
Out of phase
10u 1m 100m
Output Power [W]
Fig.20 THD+N vs. Output
Power (VDD=3.3V, RL=16Ω)
100
10
1 In phase
0.1 VDD=3.3V
20kHz-LPF
0.01 f=1kHz
Stereo
RL=32Ω
0.001
1n 100n
Out of phase
10u 1m 100m
Output Power [W]
Fig.23 THD+N vs. Output
Power (VDD=3.3V, RL=32Ω)
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
5/25
Technical Note
0 VDD=5.5V
f=1kHz
-20 BPF
RL=32Ω
-40
RL=16Ω
-60
-80
-100
-120
-120 -100 -80 -60 -40 -20
0
Input Voltage [dBV]
Fig.15 Output Voltage vs.
Input Voltage (VDD=5.5V)
10
8
6 RL=16Ω
4
2
0 RL=32Ω
-2 VDD=5.5V
-4 Po=10mW
-6
RL=16Ω
Input coupling
-8 capacitor = 1.0uF
-10
10 100 1k
10k 100k
Frequency [Hz]
Fig.18 Gain vs. Frequency
(VDD=5.5V)
100
10
1 In phase
0.1 VDD=5.5V
20kHz-LPF
0.01 f=1kHz
Stereo
RL=16Ω
0.001
1n 100n
Out of phase
10u 1m 100m
Output Power [W]
Fig.21 THD+N vs. Output
Power (VDD=5.5V, RL=16Ω)
100
10
1 In phase
0.1 VDD=5.5V
20kHz-LPF
0.01 f=1kHz
Stereo
RL=32Ω
0.001
1n 100n
Out of phase
10u 1m 100m
Output Power [W]
Fig.24 THD+N vs. Output
Power (VDD=5.5V, RL=32Ω)
2011.03 – Rev. A

5 Page





BD88420GUL arduino
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
Block Diagram
Technical Note
PVDD
A3
C1P
A4
PGND
B4
C1N
C4
PVSS
D4
CHARGE
PUMP
B1 B2
C1
SVDD
UVLO/
SHUTDOWN
CONTROL
Rin Rfb
SVDD
-
+
SVSS
SGND
SVDD
SVDD D1
OUTL
D2
SVDD
TSD
SHORT
PROTECTION
PVDD
SVDD
CHARGE
PUMP
CONTROL
CLOCK
GENERATOR
SGND
A2
A1
SGND
SVSS
+
-
SVDD
Rin Rfb
OUTR
C2
SVSS
SVSS D3
Type
BD88400GUL
BD88410GUL
BD88415GUL
BD88420GUL
Rin
14kΩ@Typ.
14kΩ@Typ.
14kΩ@Typ.
14kΩ@Typ.
Rfb
Open
14kΩ@Typ.
21kΩ@Typ.
28kΩ@Typ.
Fig.56 Block Diagram
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
11/25
2011.03 – Rev. A

11 Page







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