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
2.4½5.5
(No signal)
BD88415GUL
BD88420GUL
-1.5
-2.0
2.0
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]
Package
-1.0
80
0.006
(VDD=3.3V,RL=16Ω (VDD=3.3V,RL=16Ω
THD+N≦1%,f=1kHz) Po=10mW,f=1kHz)
10
-80
(f=217Hz)
VCSP50L2
(2.1mm x 2.1mm)
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© 2011 ROHM Co., Ltd. All rights reserved.
1/21
2011.03 – Rev. A
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
●Absolute
maximum ratings
Parameter
SGND to PGND voltage
SVDD to PVDD voltage
SVSS to PVSS voltage
SGND or PGND to SVDD, PVDD voltage
SVSS, PVSS to SGND or PGND voltage
SGND to IN_- voltage
SGND to OUT_- voltage
PGND to C1P- voltage
PGND to C1N- voltage
SGND to SHDN_B- voltage
Input current
Power Dissipation
Storage Temperature Range
*
Technical Note
Symbol
V
GG
V
DD
V
SS
V
DG
V
SG
V
IN
V
OUT
V
C1P
V
C1N
V
SH
I
IN
P
D
T
STG
Ratings
0.0
-0.3½0.3
0.0
-0.3½6.0
-3.5½0.3
(SVSS-0.3)½2.8
(SVSS-0.3)½2.8
(PGND-0.3)½(PVDD+0.3)
(PVSS-0.3)½(PGND+0.3)
(SGND-0.3)½(SVDD+0.3)
-10½10
1350 *
-55½150
Unit
V
V
V
V
V
V
V
V
V
V
mA
mW
℃
In operating over 25
℃,
de-rate the value to 10.8mW/℃. This value is for mounted on the application board
(Grass-epoxy, size: 40mm x 60mm, H=1.6mm, Top Copper area = 79.9%, Bottom Copper area = 80.2%).
●Operating
conditions
Parameter
Supply Voltage Range
Operating Temperature Range
Symbol
V
SVDD
,V
PVDD
T
OPR
Ratings
Min.
2.4
-40
Typ.
-
-
Max.
5.5
+85
Unit
V
℃
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© 2011 ROHM Co., Ltd. All rights reserved.
2/21
2011.03 – Rev. A
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
Technical Note
●Electrical
characteristics
Unless otherwise specified, Ta=25℃, SVDD=PVDD=3.3V, SGND=PGND=0V, SHDNB=SVDD, C1=C2=2.2µF,
RL=No Load, Ri=Rf=10kΩ
Limits
Parameter
Symbol
Unit
Conditions
Min.
Typ.
Max.
Supply Current
Shutdown Supply Current
I
ST
I
DD1
Quiescent Supply Current
I
DD2
SHDN_B Terminal
H Level Input Voltage
L Level Input Voltage
Input Leak Current
Headphone Amplifier
Shutdown to Full Operation
Offset Voltage
t
SON
V
IS
-
-
30
Maximum Output Power
P
OUT
40
Total Harmonic Distortion
+ Noise
Input Impedance
BD88400GUL
BD88410GUL
Gain
BD88415GUL
BD88420GUL
Gain match
Noise
Slew Rate
Maximum Capacitive Load
Crosstalk
Power Supply
Rejection Ratio
Charge-Pump
Oscillator Frequency
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
ΔA
V
V
N
SR
CL
CT
PSRR
f
OSC
TSD
T
HYS
A
V
-1.55
-2.06
-
-
-
-
-
-
200
-
-
-1.50
-2.00
1
10
0.15
200
-90
-80
300
145
5
-1.45
-1.94
-
-
-
-
-
-
430
-
-
%
µVrms
V/µs
pF
dB
dB
kHz
℃
℃
RL=32Ω, f=1kHz, VOUT=200mV
P-P
,
1kHz BPF
f=217Hz, 100mV
P-P
‐ripple,
217Hz BPF
20kHz LPF + JIS-A
-
THD+N
-
Z
IN
10
-
-1.05
0.006
14
-1.00
-1.00
0.100
19
-
-0.95
V/V
In BD88400GUL, Gain is variable
by the external resister of Ri and Rf.
%
kΩ
80
0.008
-
0.056
mW
%
80
±0.5
60
-
±5.0
-
µs
mV
mW
RL=32Ω, THD+N≦-40dB, f=1kHz,
20kHz LPF, for Single Channel
RL=16Ω, THD+N≦-40dB, f=1kHz,
20kHz LPF, for Single Channel
RL=32Ω, POUT=10mW, f=1kHz,
20kHz LPF
RL=16Ω, POUT=10mW, f=1kHz,
20kHz LPF
SHDNLB=SHDNRB=H
In BD88400GUL, ZIN = Ri
SHDNLB=SHDNRB=L→H
V
IH
V
IL
I
LEAK
1.95
-
-
-
-
-
-
0.70
±1
V
V
µA
-
2.0
7.4
mA
-
-
0.1
1.3
2
-
µA
mA
SHDNLB=SHDNRB=L
(SHDNLB,SHDNRB)=(H,L) or (L,H),
No signal
SHDNLB=SHDNRB=H,
No signal
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© 2011 ROHM Co., Ltd. All rights reserved.
3/21
2011.03 – Rev. A
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
Technical Note
●Electrical
characteristic curves – General Items (Reference data)
Unless otherwise specified, Ta=25℃, SGND=PGND=0V, SHDNLB=SHDNRB=SVDD, C1=C2=2.2µF,
Input coupling capacitor=1µF, RL=No Load
* In BD88400GUL the input resister(Ri)=10kΩ, feedback resister(Rf)=10kΩ.
1u
4.0
4.0
SHDNLB=0V
SHDNRB=0V
Operating Current [mA]
Standby Current [A]
100n
3.0
* This caracteristics has
hysteresis (40mV typ) by
UVLO.
Operating Current [mA]
SHDNLB=VDD
SHDNRB=0V
SHDNLB=VDD
SHDNRB=VDD
3.0
* This caracteristics has
hysteresis (40mV typ) by
UVLO.
10n
2.0
2.0
1n
1.0
1.0
0.1n
0.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
0.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
Supply Voltage [V]
Supply Voltage [V]
Supply Voltage [V]
Fig.1 Standby Current vs.
Supply Voltage
0
-0.5
VSS Voltage [V]
-1
-1.5
-2
-2.5
-3
2.0
2.5
3.0 3.5
4.0 4.5
5.0 5.5
6.0
Fig.2 Monaural Operating
Current vs. Supply Voltage
200
120
180
160
Setup time [us]
140
120
100
80
60
40
20
0
2.0
2.5
3.0 3.5
4.0 4.5
5.0 5.5
6.0
0
Fig.3 Stereo Operating
Current vs. Supply voltage
RL=16
Ω
, in phase
Maximum Output Power [mW]
SHDNLB=VDD
SHDNRB=VDD
No Load
SHDNLB=SHDNRB
=L->H
VSS 90% Setup time
No Load
100
80
60
RL=16
Ω
, out of phase
RL=32
Ω
, in phase
40
20
RL=32
Ω
, out of phase
THD+N
≦
-40dB
20kHz LPF
Stereo
2.0
2.5
3.0 3.5
4.0 4.5
5.0 5.5
6.0
Supply Voltage [V]
Supply Voltage [V]
Supply Voltage [V]
Fig.4 Negative Voltage vs.
Supply Voltage
0
-10
-20
-30
PSRR [dB]
PSRR [dB]
-40
-50
-60
-70
-80
-90
-100
10
100
1k
Frequency [Hz]
10k
100k
0
Fig.5 Setup time vs.
Supply Voltage
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
10
100
1k
Frequency [Hz]
10k
100k
PSRR [dB]
Fig.6 Maximum power vs.
Supply Voltage
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
10
100
1k
Frequency [Hz]
10k
100k
VDD=2.4V
Ripple = 100mVp-p
BPF
VDD=3.3V
Ripple = 100mVp-p
BPF
VDD=5.5V
Ripple = 100mVp-p
BPF
Fig.7 PSRR vs. Frequency
(VDD=2.4V)
0
-10
-20
-30
PSRR [dB]
-40
-50
-60
-70
-80
-90
-100
10
100
1k
Frequency [Hz]
10k
100k
0
Fig.8 PSRR vs. Frequency
(VDD=3.3V)
-10
-20
-30
PSRR [dB]
-40
-50
-60
-70
-80
-90
-100
10
100
1k
Frequency [Hz]
10k
100k
Fig.9 PSRR vs. Frequency
(VDD=5.5V)
0
-10
-20
-30
PSRR [dB]
-40
-50
-60
-70
-80
-90
-100
10
100
1k
Frequency [Hz]
10k
100k
VDD=2.4V
VOUT = 200mVp-p
RL=32
Ω
BPF
VDD=3.3V
VOUT = 200mVp-p
RL=32
Ω
BPF
VDD=5.5V
VOUT = 200mVp-p
RL=32
Ω
BPF
Fig.10 Crosstalk vs.
Frequency (VDD=2.4V)
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© 2011 ROHM Co., Ltd. All rights reserved.
Fig.11 Crosstalk vs.
Frequency (VDD=3.3V)
Fig.12 Crosstalk vs.
Frequency (VDD=5.5V)
4/21
2011.03 – Rev. A
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
●Electrical
characteristic curves – BD88415GUL (Reference data)
0
-20
-40
Technical Note
Output Voltage [dBV]
Output Voltage [dBV]
Output Voltage [dBV]
VDD=2.4V
f=1kHz
BPF
RL=32
Ω
0
-20
-40
VDD=3.3V
f=1kHz
BPF
RL=32
Ω
0
-20
-40
VDD=5.5V
f=1kHz
BPF
RL=32
Ω
RL=16
Ω
-60
-80
-100
-120
-120
RL=16
Ω
-60
-80
-100
-120
-120
RL=16
Ω
-60
-80
-100
-120
-120
-100
-80
-60
-40
-20
0
-100
-80
-60
-40
-20
0
-100
-80
-60
-40
-20
0
Input Voltage [dBV]
Input Voltage [dBV]
Input Voltage [dBV]
Fig.13 Output Voltage vs.
Input Voltage (VDD=2.4V)
10
8
6
4
Gain [dB]
Gain [dB]
2
0
-2
-4
-6
-8
-10
10
100
1k
Frequency [Hz]
10k
100k
10
8
Fig.14 Output Voltage vs.
Input Voltage (VDD=3.3V)
10
8
Fig.15 Output Voltage vs.
Input Voltage (VDD=5.5V)
RL=16
Ω
6
4
RL=16
Ω
6
4
RL=16
Ω
RL=32
Ω
VDD=2.4V
Po=10mW
RL=16
Ω
Input coupling
capacitor = 1.0uF
0
-2
-4
-6
-8
-10
10
100
RL=32
Ω
VDD=3.3V
Po=10mW
RL=16
Ω
Input coupling
capacitor = 1.0uF
1k
Frequency [Hz]
10k
100k
Gain [dB]
2
2
0
-2
-4
-6
-8
-10
10
100
1k
Frequency [Hz]
10k
100k
RL=32
Ω
VDD=5.5V
Po=10mW
RL=16
Ω
Input coupling
capacitor = 1.0uF
Fig.16 Gain vs. Frequency
(VDD=2.4V)
100
Fig.17 Gain vs. Frequency
(VDD=3.3V)
100
100
Fig.18 Gain vs. Frequency
(VDD=5.5V)
10
10
10
THD+N [%]
THD+N [%]
THD+N [%]
1
In phase
VDD=2.4V
20kHz-LPF
f=1kHz
Stereo
RL=16
Ω
1n
100n
10u
1
In phase
VDD=3.3V
20kHz-LPF
f=1kHz
Stereo
RL=16
Ω
1n
100n
10u
1
In phase
VDD=5.5V
20kHz-LPF
f=1kHz
Stereo
RL=16
Ω
1n
100n
10u
0.1
0.1
0.1
0.01
0.01
0.01
Out of phase
0.001
1m
100m
Out of phase
0.001
1m
100m
Out of phase
1m
100m
0.001
Output Power [W]
Output Power [W]
Output Power [W]
Fig.19 THD+N vs. Output
Power (VDD=2.4V, RL=16Ω)
100
Fig.20 THD+N vs. Output
Power (VDD=3.3V, RL=16Ω)
100
Fig.21 THD+N vs. Output
Power (VDD=5.5V, RL=16Ω)
100
10
10
10
THD+N [%]
THD+N [%]
THD+N [%]
1
In phase
VDD=2.4V
20kHz-LPF
f=1kHz
Stereo
RL=32
Ω
1n
100n
10u
1
In phase
VDD=3.3V
20kHz-LPF
f=1kHz
Stereo
RL=32
Ω
1n
100n
10u
1
In phase
VDD=5.5V
20kHz-LPF
f=1kHz
Stereo
RL=32
Ω
1n
100n
10u
0.1
0.1
0.1
0.01
0.01
0.01
Out of phase
0.001
1m
100m
Out of phase
0.001
1m
100m
Out of phase
1m
100m
0.001
Output Power [W]
Output Power [W]
Output Power [W]
Fig.22 THD+N vs. Output
Power (VDD=2.4V, RL=32Ω)
Fig.23 THD+N vs. Output
Power (VDD=3.3V, RL=32Ω)
Fig.24 THD+N vs. Output
Power (VDD=5.5V, RL=32Ω)
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© 2011 ROHM Co., Ltd. All rights reserved.
5/21
2011.03 – Rev. A
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