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Headphone Amplifiers
Coupling Capacitorless
Headphone Amplifiers
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
●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
Supply
Voltage
[V]
Supply
Current
[mA]
Gain
[V/V]
Maximum
Output Power
[mW]
THD+N
[%]
Noise
Voltage
[µVrms]
PSRR
[dB] Package
BD88400GUL
2.4～5.5 2.0
(No signal)
Variable gain
with external
resister
80
(VDD=3.3V,RL=16Ω
THD+N≦1%,f=1kHz)
0.006
(VDD=3.3V,RL=16Ω
Po=10mW,f=1kHz)
10 -80
(f=217Hz)
VCSP50L2
(2.1mm x 2.1mm)
BD88410GUL -1.0
BD88415GUL -1.5
BD88420GUL -2.0
No.11102EAT04
Technical Note
2/25
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
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●Absolute maximum ratings
Parameter Symbol Ratings Unit
SGND to PGND voltage VGG 0.0 V
SVDD to PVDD voltage VDD -0.3～0.3 V
SVSS to PVSS voltage VSS 0.0 V
SGND or PGND to SVDD, PVDD voltage VDG -0.3～6.0 V
SVSS, PVSS to SGND or PGND voltage VSG -3.5～0.3 V
SGND to IN_- voltage VIN (SVSS-0.3)～2.8 V
SGND to OUT_- voltage VOUT (SVSS-0.3)～2.8 V
PGND to C1P- voltage VC1P (PGND-0.3)～(PVDD+0.3) V
PGND to C1N- voltage VC1N (PVSS-0.3)～(PGND+0.3) V
SGND to SHDN_B- voltage VSH (SGND-0.3)～(SVDD+0.3) V
Input current IIN -10～10 mA
Power Dissipation PD 1350 * mW
Storage Temperature Range TSTG -55～150 ℃
* 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 Symbol
Ratings Unit
Min. Typ. Max.
Supply Voltage Range VSVDD,VPVDD 2.4 - 5.5 V
Operating Temperature Range TOPR -40 - +85 ℃
Technical Note
3/25
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
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A
© 2011 ROHM Co., Ltd. All rights reserved.
●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
Parameter Symbol Limits Unit Conditions
Min. Typ. Max.
Supply Current
Shutdown Supply Current IST - 0.1 2 µA SHDNLB=SHDNRB=L
Quiescent Supply Current
IDD1 - 1.3 - mA
(SHDNLB,SHDNRB)=(H,L) or (L,H),
No signal
IDD2 - 2.0 7.4 mA
SHDNLB=SHDNRB=H,
No signal
SHDN_B Terminal
H Level Input Voltage VIH 1.95 - - V
L Level Input Voltage VIL - - 0.70 V
Input Leak Current ILEAK - - ±1 µA
Headphone Amplifier
Shutdown to Full Operation tSON - 80 - µs SHDNLB=SHDNRB=L→H
Offset Voltage VIS - ±0.5 ±5.0 mV
Maximum Output Power POUT
30 60 - mW
RL=32Ω, THD+N≦-40dB, f=1kHz,
20kHz LPF, for Single Channel
40 80 - mW
RL=16Ω, THD+N≦-40dB, f=1kHz,
20kHz LPF, for Single Channel
Total Harmonic Distortion
+ Noise THD+N
- 0.008 0.056 %
RL=32Ω, POUT=10mW, f=1kHz,
20kHz LPF
- 0.006 0.100 %
RL=16Ω, POUT=10mW, f=1kHz,
20kHz LPF
Input Impedance ZIN 10 14 19 kΩ SHDNLB=SHDNRB=H
In BD88400GUL, ZIN = Ri
Gain
BD88400GUL
AV
- -1.00 -
V/V In BD88400GUL, Gain is variable
by the external resister of Ri and Rf.
BD88410GUL -1.05 -1.00 -0.95
BD88415GUL -1.55 -1.50 -1.45
BD88420GUL -2.06 -2.00 -1.94
Gain match ΔAV - 1 - %
Noise VN - 10 - µVrms 20kHz LPF + JIS-A
Slew Rate SR - 0.15 - V/µs
Maximum Capacitive Load CL - 200 - pF
Crosstalk CT - -90 - dB
RL=32Ω, f=1kHz, VOUT=200mVP-P,
1kHz BPF
Power Supply
Rejection Ratio PSRR - -80 - dB
f=217Hz, 100mVP-P‐ripple,
217Hz BPF
Charge-Pump
Oscillator Frequency fOSC 200 300 430 kHz
Thermal-Shutdown Threshold TSD - 145 - ℃
Thermal-Shutdown Hysteresis THYS - 5 - ℃
Technical Note
4/25
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
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A
© 2011 ROHM Co., Ltd. All rights reserved.
●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.
Fig.1 Standby Current vs.
Supply Voltage
0.1n
1n
10n
100n
1u
0.0 1.0 2.0 3.0 4.0 5.0 6.0
Supply Voltage [V]
Standby Current [A
]
SHDNLB=0V
SHDNRB=0V
Fig.3 Stereo Operating
Current vs. Supply voltage
0.0
1.0
2.0
3.0
4.0
0.0 1.0 2.0 3.0 4.0 5.0 6.0
Supply Voltage [V]
Operating Current [mA]
SHDNLB=VDD
SHDNRB=VDD
* This caracteristics has
hysteresis (40mV typ) by
UV LO.
Fig.2 Monaural Operating
Current vs. Supply Voltage
0.0
1.0
2.0
3.0
4.0
0.0 1.0 2.0 3.0 4.0 5.0 6.0
Supply Voltage [V]
Operating Current [mA]
SHDNLB=VDD
SHDNRB=0V
* This caracteristics has
hysteresis (40mV typ) by
UV LO.
Fig.4 Negative Voltage vs.
Supply Voltage
-3
-2.5
-2
-1.5
-1
-0.5
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Supply Voltage [V]
VSS Voltage [V]
SHDNLB=VDD
SHDNRB=VDD
No Load
Fig.8 PSRR vs. Frequency
(VDD=3.3V)
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1k 10k 100k
Frequency [Hz]
PSRR [dB]
VDD=3.3V
Ripple = 100mVp-p
BPF
Fig.7 PSRR vs. Frequency
(VDD=2.4V)
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1k 10k 100k
Frequency [Hz]
PSRR [dB]
VDD=2.4V
Ripple = 100mVp-p
BPF
Fig.9 PSRR vs. Frequency
(VDD=5.5V)
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1k 10k 100k
Frequency [Hz]
PSRR [dB]
VDD=5.5V
Ripple = 100mVp-p
BPF
Fig.10 Crosstalk vs.
Frequency (VDD=2.4V)
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1k 10k 100k
Frequency [Hz]
PSRR [dB]
VDD=2.4V
VOUT = 200mVp-p
RL=32Ω
BPF
Fig.11 Crosstalk vs.
Frequency (VDD=3.3V)
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1k 10k 100k
Frequency [Hz]
PSRR [dB]
VDD=3.3V
VOUT = 200mVp-p
RL=32Ω
BPF
Fig.12 Crosstalk vs.
Frequency (VDD=5.5V)
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1k 10k 100k
Frequency [Hz]
PSRR [dB]
VDD=5.5V
VOUT = 200mVp-p
RL=32Ω
BPF
Fig.5 Setup time vs.
Supply Voltage
0
20
40
60
80
100
120
140
160
180
200
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Supply Voltage [V]
Setup time [us]
SHDNLB=SHDNRB
=L->H
VSS 90% Setup time
No Load
Fig.6 Maximum power vs.
Supply Voltage
0
20
40
60
80
100
120
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Supply Voltage [V]
Maximum Output Power [mW]
THD+N≦-40dB
20kHz LPF
Stereo
RL=16Ω, in phase
RL=16Ω, out of phase
RL=32Ω, out of phase
RL=32Ω, in phase
Technical Note
5/25
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
www.rohm.com 2011.03 – Rev.
A
© 2011 ROHM Co., Ltd. All rights reserved.
●Electrical characteristic curves – BD88415GUL (Reference data)
Fig.13 Output Voltage vs.
Input Voltage (VDD=2.4V)
-120
-100
-80
-60
-40
-20
0
-120 -100 -80 -60 -40 -20 0
Input Voltage [dBV]
Output Voltage [dBV]
VDD=2.4V
f=1kHz
BPF
RL=32Ω
RL=16Ω
Fig.14 Output Voltage vs.
Input Voltage (VDD=3.3V)
-120
-100
-80
-60
-40
-20
0
-120 -100 -80 -60 -40 -20 0
Input Voltage [dBV]
Output Voltage [dBV]
VDD=3.3V
f=1kHz
BPF
RL=32Ω
RL=16Ω
Fig.15 Output Voltage vs.
Input Voltage (VDD=5.5V)
-120
-100
-80
-60
-40
-20
0
-120 -100 -80 -60 -40 -20 0
Input Voltage [dBV]
Output Voltage [dBV]
VDD=5.5V
f=1kHz
BPF
RL=32Ω
RL=16Ω
Fig.16 Gain vs. Frequency
(VDD=2.4V)
-10
-8
-6
-4
-2
0
2
4
6
8
10
10 100 1k 10k 100k
Frequency [Hz]
Gain [dB]
VDD=2.4V
Po=10mW
RL=16Ω
Input coupling
capacitor = 1.0uF
RL=32Ω
RL=16Ω
Fig.17 Gain vs. Frequency
(VDD=3.3V)
-10
-8
-6
-4
-2
0
2
4
6
8
10
10 100 1k 10k 100k
Frequency [Hz]
Gain [dB]
VDD=3.3V
Po=10mW
RL=16Ω
Input coupling
capacitor = 1.0uF
RL=32Ω
RL=16Ω
Fig.18 Gain vs. Frequency
(VDD=5.5V)
-10
-8
-6
-4
-2
0
2
4
6
8
10
10 100 1k 10k 100k
Frequency [Hz]
Gain [dB]
VDD=5.5V
Po=10mW
RL=16Ω
Input coupling
capacitor = 1.0uF
RL=32Ω
RL=16Ω
Fig.19 THD+N vs. Output
Power (VDD=2.4V, RL=16Ω)
0.001
0.01
0.1
1
10
100
1n 100n 10u 1m 100m
Output Power [W]
THD+N [%]
VDD=2.4V
20kHz-LPF
f=1kHz
Stereo
RL=16Ω
In phase
Out of phase
Fig.20 THD+N vs. Output
Power (VDD=3.3V, RL=16Ω)
0.001
0.01
0.1
1
10
100
1n 100n 10u 1m 100m
Output Power [W]
THD+N [%]
VDD=3.3V
20kHz-LPF
f=1kHz
Stereo
RL=16Ω
In phase
Out of phase
Fig.21 THD+N vs. Output
Power (VDD=5.5V, RL=16Ω)
0.001
0.01
0.1
1
10
100
1n 100n 10u 1m 100m
Output Power [W]
THD+N [%]
VDD=5.5V
20kHz-LPF
f=1kHz
Stereo
RL=16Ω
In phase
Out of phase
Fig.22 THD+N vs. Output
Power (VDD=2.4V, RL=32Ω)
0.001
0.01
0.1
1
10
100
1n 100n 10u 1m 100m
Output Power [W]
THD+N [%]
VDD=2.4V
20kHz-LPF
f=1kHz
Stereo
RL=32Ω
In phase
Out of phase
Fig.23 THD+N vs. Output
Power (VDD=3.3V, RL=32Ω)
0.001
0.01
0.1
1
10
100
1n 100n 10u 1m 100m
Output Power [W]
THD+N [%]
VDD=3.3V
20kHz-LPF
f=1kHz
Stereo
RL=32Ω
In phase
Out of phase
Fig.24 THD+N vs. Output
Power (VDD=5.5V, RL=32Ω)
0.001
0.01
0.1
1
10
100
1n 100n 10u 1m 100m
Output Power [W]
THD+N [%]
VDD=5.5V
20kHz-LPF
f=1kHz
Stereo
RL=32Ω
In phase
Out of phase
Technical Note
6/25
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
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A
© 2011 ROHM Co., Ltd. All rights reserved.
●Electrical characteristic curves – BD88415GUL (Reference data) – Continued
Fig.31 Noise Spectrum
(VDD=2.4V)
-140
-120
-100
-80
-60
-40
-20
0
10 100 1k 10k 100k
Frequency [Hz]
Spectrum [dBV]
VDD=2.4V
Input connect
to the ground
with 1uF
Fig.32 Noise Spectrum
(VDD=3.3V)
-140
-120
-100
-80
-60
-40
-20
0
10 100 1k 10k 100k
Frequency [Hz]
Spectrum [dBV]
VDD=3.3V
Input connect
to the ground
with 1uF
Fig.33 Noise Spectrum
(VDD=5.5V)
-140
-120
-100
-80
-60
-40
-20
0
10 100 1k 10k 100k
Frequency [Hz]
Spectrum [dBV]
VDD=5.5V
Input connect
to the ground
with 1uF
Fig.25 THD+N vs. Frequency
(VDD=2.4V, RL=16Ω)
0.001
0.01
0.1
1
10
100
10 100 1k 10k 100k
Frequency [Hz]
THD+N [%]
VDD=2.4V
RL=16Ω
20kHz-LPF
Stereo (in phase)
Po=10mW
Po=1mW
Po=0.1mW
Fig. 26 THD+N vs. Frequency
(VDD=3.3V, RL=16Ω)
0.001
0.01
0.1
1
10
100
10 100 1k 10k 100k
Frequency [Hz]
THD+N [%]
VDD=3.3V
RL=16Ω
20kHz-LPF
Stereo (in phase)
Po=10mW
Po=1mW
Po=0.1mW
Fig. 27 THD+N vs. Frequency
(VDD=5.5V, RL=16Ω)
0.001
0.01
0.1
1
10
100
10 100 1k 10k 100k
Frequency [Hz]
THD+N [%]
VDD=5.5V
RL=16Ω
20kHz-LPF
Stereo (in phase)
Po=10mW
Po=1mW
Po=0.1mW
Fig. 28 THD+N vs. Frequency
(VDD=2.4V, RL=32Ω)
0.001
0.01
0.1
1
10
100
10 100 1k 10k 100k
Frequency [Hz]
THD+N [%]
VDD=2.4V
RL=32Ω
20kHz-LPF
Stereo (in phase)
Po=1mW
Po=10mW
Po=0.1mW
Fig. 29 THD+N vs. Frequency
(VDD=3.3V, RL=32Ω)
0.001
0.01
0.1
1
10
100
10 100 1k 10k 100k
Frequency [Hz]
THD+N [%]
VDD=3.3V
RL=32Ω
20kHz-LPF
Stereo (in phase)
Po=1mW
Po=10mW
Po=0.1mW
Fig. 30 THD+N vs. Frequency
(VDD=5.5V, RL=32Ω)
0.001
0.01
0.1
1
10
100
10 100 1k 10k 100k
Frequency [Hz]
THD+N [%]
VDD=5.5V
RL=32Ω
20kHz-LPF
Stereo (in phase)
Po=1mW
Po=10mW
Po=0.1mW
Technical Note
7/25
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
www.rohm.com 2011.03 – Rev.
A
© 2011 ROHM Co., Ltd. All rights reserved.
●Electrical characteristic curves – BD88400GUL (Reference data)
Fig.34 Output Voltage vs.
Input Voltage (VDD=3.3V)
-120
-100
-80
-60
-40
-20
0
-120 -100 -80 -60 -40 -20 0
Input Voltage [dBV]
Output Voltage [dBV]
VDD=3.3V
f=1kHz
BPF
RL=32Ω
RL=16Ω
Fig.40 Noise Spectrum
(VDD=3.3V)
-140
-120
-100
-80
-60
-40
-20
0
10 100 1k 10k 100k
Frequency [Hz]
Spectrum [dBV]
VDD=3.3V
Input connect
to the ground
with 1uF
Fig.35 Gain vs. Frequency
(VDD=3.3V)
-10
-8
-6
-4
-2
0
2
4
6
8
10
10 100 1k 10k 100k
Frequency [Hz]
Gain [dB]
VDD=3.3V, Po=10mW
Ri=10kΩ, Input coupling
capacitor = 1.0uF
RL=32Ω
RL=16Ω
Fig.36 THD+N vs. Output
Power (VDD=3.3V, RL=16Ω)
0.001
0.01
0.1
1
10
100
1n 100n 10u 1m 100m
Output Power [W]
THD+N [%]
VDD=3.3V
20kHz-LPF
f=1kHz
Stereo
RL=16ΩOut of phase
In phase
Fig. 37 THD+N vs. Output
Power (VDD=3.3V, RL=32Ω)
0.001
0.01
0.1
1
10
100
1n 100n 10u 1m 100m
Output Power [W]
THD+N [%]
VDD=3.3V
20kHz-LPF
f=1kHz
Stereo
RL=32ΩOut of phase
In phase
Fig.38 THD+N vs. Frequency
(VDD=3.3V, RL=16Ω)
0.001
0.01
0.1
1
10
100
10 100 1k 10k 100k
Frequency [Hz]
THD+N [%]
VDD=3.3V
RL=16Ω
20kHz-LPF
Stereo (in phase)
Po=10mW
Po=1mW
Po=0.1mW
Fig. 39 THD+N vs. Frequency
(VDD=3.3V, RL=32Ω)
0.001
0.01
0.1
1
10
100
10 100 1k 10k 100k
Frequency [Hz]
THD+N [%]
VDD=3.3V
RL=32Ω
20kHz-LPF
Stereo (in phase)
Po=10mW
Po=1mW
Po=0.1mW
Technical Note
8/25
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
www.rohm.com 2011.03 – Rev.
A
© 2011 ROHM Co., Ltd. All rights reserved.
●Electrical characteristic curves – BD88410GUL (Reference data)
Fig.41 Output Voltage vs.
Input Voltage (VDD=3.3V)
-120
-100
-80
-60
-40
-20
0
-120 -100 -80 -60 -40 -20 0
Input Voltage [dBV]
Output Voltage [dBV]
VDD=3.3V
f=1kHz
BPF
RL=32Ω
RL=16Ω
Fig.42 Gain vs. Frequency
(VDD=3.3V)
-10
-8
-6
-4
-2
0
2
4
6
8
10
10 100 1k 10k 100k
Frequency [Hz]
Gain [dB]
VDD=3.3V
Po=10mW
Input coupling
capacitor = 1.0uF
RL=32Ω
RL=16Ω
Fig.47 Noise Spectrum
(VDD=3.3V)
-140
-120
-100
-80
-60
-40
-20
0
10 100 1k 10k 100k
Frequency [Hz]
Spectrum [dBV]
VDD=3.3V
Input connect
to the ground
with 1uF
Fig.43 THD+N vs. Output
Power (VDD=3.3V, RL=16Ω)
0.001
0.01
0.1
1
10
100
1n 100n 10u 1m 100m
Output Power [W]
THD+N [%]
VDD=3.3V
20kHz-LPF
f=1kHz
Stereo
RL=16ΩOut of phase
In phase
Fig. 44 THD+N vs. Output
Power (VDD=3.3V, RL=32Ω)
0.001
0.01
0.1
1
10
100
1n 100n 10u 1m 100m
Output Power [W]
THD+N [%]
VDD=3.3V
20kHz-LPF
f=1kHz
Stereo
RL=32ΩOut of phase
In phase
Fig.45 THD+N vs. Frequency
(VDD=3.3V, RL=16Ω)
0.001
0.01
0.1
1
10
100
10 100 1k 10k 100k
Frequency [Hz]
THD+N [%]
VDD=3.3V
RL=16Ω
20kHz-LPF
Stereo (in phase)
Po=10mW
Po=1mW
Po=0.1mW
Fig. 46 THD+N vs. Frequency
(VDD=3.3V, RL=32Ω)
0.001
0.01
0.1
1
10
100
10 100 1k 10k 100k
Frequency [Hz]
THD+N [%]
VDD=3.3V
RL=32Ω
20kHz-LPF
Stereo (in phase)
Po=10mW
Po=1mW Po=0.1mW
Technical Note
9/25
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●Electrical characteristic curves – BD88420GUL (Reference data)
Fig.48 Output Voltage vs.
Input Voltage (VDD=3.3V)
-120
-100
-80
-60
-40
-20
0
-120 -100 -80 -60 -40 -20 0
Input Voltage [dBV]
Output Voltage [dBV]
VDD=3.3V
f=1kHz
BPF
RL=32Ω
RL=16Ω
Fig.49 Gain vs. Frequency
(VDD=3.3V)
-10
-8
-6
-4
-2
0
2
4
6
8
10
10 100 1k 10k 100k
Frequency [Hz]
Gain [dB]
VDD=3.3V
Po=10mW
Input coupling
capacitor = 1.0uF
RL=32Ω
RL=16Ω
Fig.54 Noise Spectrum
(VDD=3.3V)
-140
-120
-100
-80
-60
-40
-20
0
10 100 1k 10k 100k
Frequency [Hz]
Spectrum [dBV]
VDD=3.3V
Input connect
to the ground
with 1uF
Fig.50 THD+N vs. Output
Power (VDD=3.3V, RL=16Ω)
0.001
0.01
0.1
1
10
100
1n 100n 10u 1m 100m
Output Power [W]
THD+N [%]
VDD=3.3V
20kHz-LPF
f=1kHz
Stereo
RL=16ΩOut of phase
In phase
Fig. 51 THD+N vs. Output
Power (VDD=3.3V, RL=32Ω)
0.001
0.01
0.1
1
10
100
1n 100n 10u 1m 100m
Output Power [W]
THD+N [%]
VDD=3.3V
20kHz-LPF
f=1kHz
Stereo
RL=32ΩOut of phase
In phase
Fig.52 THD+N vs. Frequency
(VDD=3.3V, RL=16Ω)
0.001
0.01
0.1
1
10
100
10 100 1k 10k 100k
Frequency [Hz]
THD+N [%]
VDD=3.3V
RL=16Ω
20kHz-LPF
Stereo (in phase)
Po=10mW
Po=1mW
Po=0.1mW
Fig. 53 THD+N vs. Frequency
(VDD=3.3V, RL=32Ω)
0.001
0.01
0.1
1
10
100
10 100 1k 10k 100k
Frequency [Hz]
THD+N [%]
VDD=3.3V
RL=32Ω
20kHz-LPF
Stereo (in phase)
Po=10mW
Po=1mW Po=0.1mW
Technical Note
10/25
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●Pin Arrangement
1 2 3 4
D SVDD OUTL SVSS PVSS
C INL OUTR C1N
B SHDNRB SHDNLB PGND
A INR SGND PVDD C1P
(Bottom View)
●Pin Function
Ball
Matrix Pin name Function Symbol
A1 INR Headphone Amplifier (Rch) input C
A2 SGND Ground for Headphone Amplifier -
A3 PVDD Positive Power Supply for Charge Pump -
A4 C1P Flying Capacitor (CF) Positive A
B1 SHDNRB Headphone Amplifier (Rch) Shutdown Control (H:active, L:shutdown) E
B2 SHDNLB Headphone Amplifier (Lch) Shutdown Control (H:active, L:shutdown) E
B4 PGND Ground for Charge Pump -
C1 INL Headphone Amplifier (Lch) input C
C2 OUTR Headphone Amplifier (Rch) output D
C4 C1N Flying Capacitor (CF) Negative B
D1 SVDD Ground for Headphone Amplifier -
D2 OUTL Headphone Amplifier (Lch) output D
D3 SVSS Negative Supply Voltage for Signal -
D4 PVSS Negative Supply Voltage output F
●Pin equivalent circuit
A
　　　　　
PAD
PVDD PVDD
PGND PGND
C
PAD
-
+
SVDD
SVSS
D
PAD
-
+
SVSS
SVDD
　　　
　　
E
　　　　
　
PAD
SVDD
SGND
B
　　　　　
PAD
PVSS PVSS
PGND PGND
　　　　　
Fig.55 Pin equivalent circuit
F
PAD
PGND
　　　　　
PGND
Technical Note
11/25
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●Block Diagram
Type Rin Rfb
BD88400GUL 14kΩ@Typ. Open
BD88410GUL 14kΩ@Typ. 14kΩ@Typ.
BD88415GUL 14kΩ@Typ. 21kΩ@Typ.
BD88420GUL 14kΩ@Typ. 28kΩ@Typ.
Fig.56 Block Diagram
D2
+
-
SVDD
SVSS
+
-
SVDD
SVSS
SHORT
PROTECTION
TSD
SGND
SGND
UVLO/
SHUTDOWN
CONTROL
C2
Rin Rfb
RfbRin
C1
A1
B2B1
D1
CHARGE
PUMP
CLOCK
GENERATOR
SVDD
SVDD
SVDD
D3
SVDD
SVSS
A3
A4
B4
C4
D4
SGND
A2
PVDD
C1P
PGND
C1N
PVSS
INR INL
SHDNLB
SHDNRB
SGND
SVDD
OUTL
OUTR
SVSS
CHARGE
PUMP
CONTROL
PVDD
Technical Note
12/25
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●Functional descriptions
The conventional headphone amplifier composition is occupied to Fig.57. In this composition, the signal is output by using
the middle point bias circuit based on the middle point bias. Therefore, the output coupling capacitor that removes the DC
voltage difference and does the AC coupling is necessary. This coupling capacitor and the impedance of the headphone
composes the high-pass filter. Therefore, the signal degradation in the low frequency region learns by experience. The
output coupling capacitor should be a large capacity, because the cutoff frequency of this high-pass filter becomes the
following formula (1).
CL
cCR2
1
fπ
(1)
* Cc is the coupling capacitor, and RL is the impedance of the headphone.
Moreover, POP noise by the middle point bias start-up is generated and the degradation of PSRR learns by experience.
+
-
VDD
GND
+
Vout
Input
time [s]
Vout [V]
VDD/2
Middle Point
Bias Circuit
VDD
0
Vhp
0
Vhp [V]
time [s]
Cc
Fig.57 Conventional headphone amplifier composition
The composition of the series of BD884xxGUL is occupied to Fig.58. In this composition, the signal is output by using a
negative voltage based on the ground level. Therefore, the amplifier output can be connected directly with the headphone.
And, the output coupling capacitor becomes unnecessary. Additionally, the signal degradation in the low frequency region
with the coupling capacitor is not generated, and the deep bass is achieved.
Moreover, POP noise is controlled because of no middle point bias start-up. And, the degradation of PSRR doesn't occur by
being based on the ground.
+
-
HPVDD
Vout
Input
time [s]
Vout [V]
VDD
Charge
Pump VSS
0
CF : Flying
Capacitor
CH : Hold
Capacitor
Vhp
0
Vhp [V]
time [s]
HPVDD
Fig.58 Composition of the series of BD884xxGUL
Technical Note
13/25
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[CHARGE PUMP / CHARGE PUMP CONTROL]
The negative power supply circuit is composed of the regulated charge-pump. This circuit outputs the regulated negative
voltage (PVSS) directly from power-supply voltage (PVDD). Therefore, it doesn't depend on the power-supply voltage, and
a constant voltage is output (PVSS=-2.4V@Typ., refer to Fig.4). Moreover, there is not swinging of the power supply by the
output current of the headphone amplifier, and it doesn't influence the headphone amplifier characteristic.
Fig.59 Characteristics of load current regulation of PVSS (Reference data)
・Power control
The power control is a logical sum of SHDNLB and SHDNRB. The negative power supply circuit starts when H level is
input to either of SHDNLB or SHDNRB, and power is downed at the SHDNLB=SHDNRB=L level.
Table.1 Control of the charge pump
SHDNLB SHDNRB Control
L L Power down
L H Power on
H L Power on
H H Power on
・Operating Frequency
The operating frequency of the negative power supply charge pump is designed for the temperature and the voltage
dependence may decrease. The reference data (measurements) is occupied to Fig.60. Please note the interference with
the frequency in the application board.
Fig.60 Temperature characteristic and Voltage characteristic of operating frequency (Reference data)
・The flying capacitor and the hold capacitor
The flying capacitor (CF) and the hold capacitor (CH) greatly influence the characteristic of the charge pump. Therefore,
please connect the capacitor with an excellent temperature characteristic and voltage characteristic of 2.2µF as much as
possible near IC.
-3
-2.5
-2
-1.5
-1
-0.5
0
0 20406080
Load Current [mA]
VSS Voltage [V]
Ta=25℃
VDD=3.3V
SHDN_B=SVDD
CF=CH=2.2uF
200
220
240
260
280
300
320
340
360
380
400
2.0 3.0 4.0 5.0 6.0
Supply Voltage[V]
Charge Pump Ocsillator Frequency [kHz
]
Ta=25℃
Measure : C1P
CF=CH=2.2uF
200
220
240
260
280
300
320
340
360
380
400
-50.0 0.0 50.0 100.0
Ta [℃]
Charge Pump Ocsillator Frequency [kHz
]
VDD=3.3V
Measure : C1P
CF=CH=2.2uF
Technical Note
14/25
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[HEADPHONE AMP]
The headphone amplifier is driven by the internal positive voltage (+2.4V) and negative voltage (SVSS, -2.4V) based on
ground (SGND). Therefore, the headphone can be connected without the output coupling capacitor. As a result, it brings the
improved low-frequency characteristic compared with the headphone of the conventional coupling capacitor type.
・Power control
L channel and R channel of the headphone amplifier can be independently controlled by SHDNLB and SHDNRB logic.
When the SVSS voltage is -1.1V@Typ. or more, the headphone amplifier does not operate to protect from illegal operation.
And in addition, the overcurrent protection circuit is built in. The amplifier is shutdown when the overcurrent occurs
because of the output short-circuit etc., and IC is protected from being destroyed.
Table.2 Control of the headphone amplifier
SHDNLB SHDNRB L channel R channel
L L Power down Power down
L H Power down Power on
H L Power on Power down
H H Power on Power on
VDD
0
[V]
[time]
SHDNx B
0
[V]
[time]
SVSS
-1.1V
A mplif ier
En a b le
Amprilier
Disable
Fig.61 Area of headphone amplifier can operate
SVSS does not have internal connection with PVSS. Please connect SVSS with PVSS on the application board.
・Input coupling capacitor
Input DC level of BD884xxGUL is 0V (SGND). The input coupling capacitor is necessary for the connection with the
signal source device. The signal decrease happens in the low frequency because of composing the high-pass filter by
this input coupling capacitor and the input impedance of BD884xxGUL.
The input impedance of BD884xxGUL is Rin (14kΩ@Typ.). The cutoff frequency of this high-pass filter becomes the
following formula. (In BD88400GUL, Rin becomes external resistance Ri. )
inin
cCRπ2
1
f (2)
* Cin is the input coupling capacitor.
Fig.62 Frequency response by the input coupling capacitor (Reference data)
-21.0
-18.0
-15.0
-12.0
-9.0
-6.0
-3.0
0.0
3.0
6.0
9.0
1 10 100
Frequency [Hz]
Gain [dB]
Rin=14kΩ
Cin=1uF
Cin=2.2uF
Cin=4.7uF
Cin=10uF
Technical Note
15/25
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
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And, the degradation of THD+N happens because of the input coupling capacitor. Therefore, please consider these about
the selection of parts.
* Capacitor size: 1608
Fig.63 THD+N by the input coupling capacitor (Reference data)
・State of terminal when power down
The state of the terminal changes by the power control of the headphone amplifier. When it is shutdown, the input
impedance of the input terminal becomes 7.1kΩ@Typ. (In BD88400GUL, become Ri + 7.1kΩ). The time constant can be
reduced when the input coupling capacitor is charged.
The input voltage changes while charging up the input coupling capacitor. Therefore, do not operate the headphone
amplifier while charging.
Audio
Source
+
-
VDD
Vout
time [s]
Vs [V]
Output
Bias
0
VSS
Vs Vin
time [s]
Vin [V]
Output
Bias
0
Cin
Rin =7.1kΩ
Fig.64 Input voltage transition with input coupling capacitor
This charge time constant becomes the following formula (3) by using the input coupling capacitor and the input
impedance. And the calculation value of the convergence to the wait time is indicated in Fig.65.
ininCRτ (3)
* Rin=7.1kΩ@Typ.. In BD88400GUL, Rin=Ri+7.1kΩ
Fig.65 Wait time and convergence (Reference)
0
10
20
30
40
50
60
70
80
90
100
0τ 1τ 2τ 3τ 4τ 5τ 6τ 7τ 8τ
Wait time [s]
Convergence [%]
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1k 10k 100k
Frequency [Hz]
THD+N [dB]
BD88415GUL
VDD=3.3V
Po=10mW
RL=16Ω
20kHz LPF
Cin=0.22uF
Cin=0.47uF
Cin=1.0uF
Cin=2.2uF
Technical Note
16/25
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
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[UVLO / SHUTDOWN CONTROL]
BD884xxGUL has low voltage protection function (UVLO: Under Voltage Lock Out). And protect from the illegal operation of
IC by a low power supply voltage.
The detection voltage is 2.13V@Typ., so it does not influence 2.4V of recommended operation voltage. UVLO controls the
whole of IC, and does both the negative power supply charge pump and the headphone amplifier in power down.
[TSD]
BD884xxGUL has overheating protection function (TSD: Thermal Shutdown). And the headphone amplifier becomes
shutdown when illegally overheating by the headphone amplifier illegally operation.
●Timming Chart
(Usually Operation)
PV DD,SV DD
SHDNLB
SHDNRB
PVSS,SVSS
INL,INR
OUTL
OUTR
Shutdow n Setup Signal output Shutdow n
Amp enable
Fig.66 Usually Operation
(UVLO Operation)
PVDD,SVDD
SHDNLB,
SHDNRB
PVSS,SVSS
OUTL
OUTR
SetupSignal output Signal outputUVLO
Fig.67 UVLO Operation
(TSD Operation)
PV DD, SV DD
SHDNLB,
SHDNRB
PVSS,SVSS
OUTL
OUTR
Signal output Signal outputTSD
Ta
Hy steresis = 5℃
Fig.68 TSD Operation
Technical Note
17/25
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●Application Circuit
Fig.69 BD88410GU/BD88415GUL/BD88420GUL application circuit
Fig.70 BD88400GUL application circuit
In BD88400GUL, the Pass Gain becomes the following formula (4). The Pass Gain and the resister Rf is limited by table.3.
i
f
R
R
Gain (4)
Table.3 Pass Gain and Resister Limit
Item Min. Typ. Max. Unit
Pass Gain 0.5 1.0 2.0 V/V
Rf 1.0 10 - kΩ
Ri - 10 - kΩ
Ri is not limited. But, if this resister Ri is very small, the signal decrease happens in the low frequency (Refer to formula 2).
Part Function value Remarks
CF Flying
Capacitor 2.2µF Temp. Characteristic：
Class-B
CH Hold
Capacitor 2.2µF Temp. Characteristic：
Class-B
Cpvdd Bypass
Capacitor 1.0µF Temp. Characteristic：
Class-B
Csvdd Bypass
Capacitor 1.0µF Temp. Characteristic：
Class-B
Cil Coupling
Capacitor 1.0µF Temp. Characteristic：
Class-B
Cir Coupling
Capacitor 1.0µF Temp. Characteristic：
Class-B
Part Function value Remarks
CF Flying
Capacitor 2.2µF Temp. Characteristic：
Class-B
CH Hold
Capacitor 2.2µF Temp. Characteristic：
Class-B
Cpvdd Bypass
Capacitor 1.0µF Temp. Characteristic：
Class-B
Csvdd Bypass
Capacitor 1.0µF Temp. Characteristic：
Class-B
Cil Coupling
Capacitor 1.0µF Temp. Characteristic：
Class-B
Cir Coupling
Capacitor 1.0µF Temp. Characteristic：
Class-B
Ri Input
Resistor 10kΩ MCR006YZPJ103
(ROHM)
Rf Feedback
Resistor 10kΩ MCR006YZPJ103
(ROHM)
D2
+
-
SVDD
SVSS
+
-
SVDD
SVSS
SHORT
PROTECTION
TSD
SGND
SGND
UVLO/
SHUTDOWN
CONTROL
C2
Rin Rfb
Rfb
Rin
C1
A1
B2B1
D1
CHARGE
PUMP
CLOCK
GENERATOR
SVDD
SVDD
SVDD
D3
SVDD
SVSS
A3
A4
B4
C4
D4
SGND
A2
PVDD
C1P
PGND
C1N
PVSS
SVDD
OUTL
OUTR
SVSS
CHARGE
PUMP
CONTROL
PVDD
3.3V
1.0μF
2.2μF
2.2μF
1.0μF
Rch Input
3.3V
1.0μF
SHUTDOWN
Control
1.0μF
Lch Input
CF
CH
Cpvdd
Csvdd
Cil
Cir
INR INL
SHDNLB
SHDNRB
SGND
Technical Note
18/25
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
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●Thermal Derating Curve
The reference value of the thermal derating curve is indicated in Fig.71.
(Conditions)
This value is for mounted on the ROHM application board
Board size：40mm x 60mm x 1.6mm
Top Copper Area：79.9%
Bottom Copper Area：80.2%
Board Layout：Fig.74
Fig.71 Thermal Derating Curve
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
0 25 50 75 100 125 150
Ta [℃]
Pd [W]
Technical Note
19/25
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
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●Evaluation Board
D8876FV Evaluation Board loads with the necessary parts. It can operate only by it. It is using RCA Connector for input
terminal and Headphone jack (φ=3.5mm) for output terminal. Therefore it can easily connect between Audio equipments.
And it can operate by single supply (2.4 to 5.5V). The switch on the board (SDB) can control shutdown.
(Spec.)
Item Limit Unit
Supply Voltage Range (VDD) 3.0 to 5.5 V
Maximum Supply Current 1.0 A
Operating Temperature Range -40 to 85 ℃
Input Voltage Range -2.5 to 2.5 V
Output Voltage Range -2.5 to 2.5 V
Minimum Load Impedance 15 Ω
(Schematic)
OUTL
INL
PVDD
SVDD
PGND
SGND
SHDNLB
OUTR
INR
C1P
C1N
PVSS
SVSS
SHDNRB
D1
B2
A3
C1
D2 C2
A1
D4
D3
A4
C4
B4
A2
B1
C6
1μF
IN<L>
RCA(White)
IN<L>
L
R
OUTL OUTR
R5R6
VDD
3.3V
+
GND
GND
Headphone
Jack
CN1
C7
10uF
VDD
GND
(Open)
VDD
GND
(Open)
SW2 SW1
SHDNLB SHDNRB
GND
C3
2.2μF
C4
1μF
IN<R>
RCA(Red)
IN<R>
C1
2.2μF
C5
1μF
C2
1μF
BD88410GUL
/ BD88415GUL
/ BD88420GUL
VSS
Fig.72 Evaluation Board Schematic (BD88410GUL/BD88415GUL/BD88420GUL)
Technical Note
20/25
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OUTL
INL
PVDD
SVDD
PGND
SGND
SHDNLB
OUTR
INR
C1P
C1N
PVSS
SVSS
SHDNRB
D1
B2
A3
C1
D2 C2
A1
D4
D3
A4
C4
B4
A2
B1
C6
1μF
IN<L>
RCA(White)
IN<L>
L
R
OUTL OUTR
R5R6
VDD
3.3V
+
GND
GND
Headphone
Jack
CN1
C7
10uF
VDD
GND
(Open)
VDD
GND
(Open)
SW2 SW1
SHDNLB SHDNRB
GND
C3
2.2μF
C4
1μF
IN<R>
RCA(Red)
IN<R>
C1
2.2μF
C5
1μF
C2
1μF
BD88400GUL
VSS
R3
10kΩ
R4
10kΩ
R1
10kΩ
R2
10kΩ
Fig.73 Evaluation Board Schematic (BD88400GUL)
(Parts List)
Parts name Type Value Size
U1 CSP-14pin BD884xxGUL 2.1mm x 2.1mm
C1, C3 Chip Ceramic capacitor 2.2µF 1608
C2, C4～C6 Chip Ceramic capacitor 1.0µF 1608
C7 Tantalum capacitor 10µF 3216
R1～R4 Chip Resistor 10kΩ 1608
R5, R6 Chip Resistor Open -
CN1 Headphone jack - φ=3.5mm
R1～R4 * Chip Resistor 10kΩ 1608
*About BD88200GUL, R1～R4 of is the resistor for the gain setting.
(Operation procedure)
① Turn off the switch (SHNDLB/SHDNRB) on evaluation board.
② Connect the positive terminal of the power supply to the VDD pin and ground terminal to the GND pin.
③ Connect the left output of the audio source to the INL and connect the right output to the INR.
④ Turn on the power supply.
⑤ Turn on the switch (SHDNLB/SHDNRB) on the evaluation board. (H)
⑥ Input the audio source.
Technical Note
21/25
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(Board Layout)
(TOP SILKSCREEN – TOP VIEW) (TOP LAYER - TOP VIEW)
(BOTTOM LAYER – TOP VIEW) (BOTTOM SILKSCREEN – TOP VIEW)
Fig.74 ROHM Application Board Layout (BD88410GUL/BD88415GUL/BD88420GUL)
Technical Note
22/25
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
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A
© 2011 ROHM Co., Ltd. All rights reserved.
(TOP SILKSCREEN – TOP VIEW) (TOP LAYER - TOP VIEW)
(BOTTOM LAYER – TOP VIEW) (BOTTOM SILKSCREEN – TOP VIEW)
Fig.75 ROHM Application Board Layout (BD88400GUL)
Technical Note
23/25
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
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A
© 2011 ROHM Co., Ltd. All rights reserved.
●Notes for use
(1) Absolute Maximum Ratings
An excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions, etc.,
can break down devices, thus making impossible to identify breaking mode such as a short circuit or an open circuit. If
any special mode exceeding the absolute maximum ratings is assumed, consideration should be given to take physical
safety measures including the use of fuses, etc.
(2) Operating conditions
These conditions represent a range within which characteristics can be provided approximately as expected. The
electrical characteristics are guaranteed under the conditions of each parameter.
(3) Reverse connection of power supply connector
The reverse connection of power supply connector can break down ICs. Take protective measures against the
breakdown due to the reverse connection, such as mounting an external diode between the power supply and the IC’s
power supply terminal.
(4) Power supply line
Design PCB pattern to provide low impedance for the wiring between the power supply and the GND lines. In this
regard, for the digital block power supply and the analog block power supply, even though these power supplies has
the same level of potential, separate the power supply pattern for the digital block from that for the analog block, thus
suppressing the diffraction of digital noises to the analog block power supply resulting from impedance common to the
wiring patterns. For the GND line, give consideration to design the patterns in a similar manner.
Furthermore, for all power supply terminals to ICs, mount a capacitor between the power supply and the GND terminal.
At the same time, in order to use an electrolytic capacitor, thoroughly check to be sure the characteristics of the
capacitor to be used present no problem including the occurrence of capacity dropout at a low temperature, thus
determining the constant.
(5) GND voltage
Make setting of the potential of the GND terminal so that it will be maintained at the minimum in any operating state.
Furthermore, check to be sure no terminals are at a potential lower than the GND voltage including an actual electric
transient.
(6) Short circuit between terminals and erroneous mounting
In order to mount ICs on a set PCB, pay thorough attention to the direction and offset of the ICs. Erroneous mounting
can break down the ICs. Furthermore, if a short circuit occurs due to foreign matters entering between terminals or
between the terminal and the power supply or the GND terminal, the ICs can break down.
(7) Operation in strong electromagnetic field
Be noted that using ICs in the strong electromagnetic field can malfunction them.
(8) Inspection with set PCB
On the inspection with the set PCB, if a capacitor is connected to a low-impedance IC terminal, the IC can suffer stress.
Therefore, be sure to discharge from the set PCB by each process. Furthermore, in order to mount or dismount the set
PCB to/from the jig for the inspection process, be sure to turn OFF the power supply and then mount the set PCB to
the jig. After the completion of the inspection, be sure to turn OFF the power supply and then dismount it from the jig. In
addition, for protection against static electricity, establish a ground for the assembly process and pay thorough attention
to the transportation and the storage of the set PCB.
(9) Input terminals
In terms of the construction of IC, parasitic elements are inevitably formed in relation to potential. The operation of the
parasitic element can cause interference with circuit operation, thus resulting in a malfunction and then breakdown of
the input terminal. Therefore, pay thorough attention not to handle the input terminals, such as to apply to the input
terminals a voltage lower than the GND respectively, so that any parasitic element will operate. Furthermore, do not
apply a voltage to the input terminals when no power supply voltage is applied to the IC. In addition, even if the power
supply voltage is applied, apply to the input terminals a voltage lower than the power supply voltage or within the
guaranteed value of electrical characteristics.
(10) Ground wiring pattern
If small-signal GND and large-current GND are provided, It will be recommended to separate the large-current GND
pattern from the small-signal GND pattern and establish a single ground at the reference point of the set PCB so that
resistance to the wiring pattern and voltage fluctuations due to a large current will cause no fluctuations in voltages of
the small-signal GND. Pay attention not to cause fluctuations in the GND wiring pattern of external parts as well.
(11) External capacitor
In order to use a ceramic capacitor as the external capacitor, determine the constant with consideration given to a
degradation in the nominal capacitance due to DC bias and changes in the capacitance due to temperature, etc.
(12) About the rush current
For ICs with more than one power supply, it is possible that rush current may flow instantaneously due to the internal
powering sequence and delays. Therefore, give special consideration to power coupling capacitance, power wiring,
width of GND wiring, and routing of wiring.
Technical Note
24/25
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
www.rohm.com 2011.03 – Rev.
A
© 2011 ROHM Co., Ltd. All rights reserved.
●Ordering part number
B D 8 8 4 1 5 G U L - E 2
Part No. Part No.
BD88400
BD88410
BD88415
BD88420
Package
GUL: VCSP50L2 Packaging and formingspecification
E2: Embossed tape and reel
∗
Order quantity needs to be multiple of the minimum quantity.
<Tape and Reel information>
Embossed carrier tapeTape
Quantity
Direction
of feed 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
3000pcs
E2
()
Direction of feed
Reel 1pin
(Unit : mm)
VCSP50L2
(BD88400GUL)
2.10±0.05
1PIN MARK
2.10±0.05
0.55MAX
0.1±0.05
S
0.06 S
3
0.30±0.05
2
(φ0.15)INDEX POST
4
C
1
0.30±0.05
B
A
P=0.5×3
P=0.5×3
D
14-φ0.25±0.05
A
B
BA
0.05
∗
Order quantity needs to be multiple of the minimum quantity.
<Tape and Reel information>
Embossed carrier tapeTape
Quantity
Direction
of feed 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
3000pcs
E2
()
Direction of feed
Reel 1pin
(Unit : mm)
VCSP50L2
(BD88410GUL)
2.10±0.05
1PIN MARK
2.10±0.05
0.55MAX
0.1±0.05
S
0.06 S
3
0.30±0.05
2
(φ0.15)INDEX POST
4
C
1
0.30±0.05
B
A
P=0.5×3
P=0.5×3
D
14-φ0.25±0.05
A
B
BA
0.05
∗
Order quantity needs to be multiple of the minimum quantity.
<Tape and Reel information>
Embossed carrier tapeTape
Quantity
Direction
of feed 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
3000pcs
E2
()
Direction of feed
Reel 1pin
(Unit : mm)
VCSP50L2
(BD88415GUL)
2.10±0.05
1PIN MARK
2.10±0.05
0.55MAX
0.1±0.05
S
0.06 S
3
0.30±0.05
2
(φ0.15)INDEX POST
4
C
1
0.30±0.05
B
A
P=0.5×3
P=0.5×3
D
14-φ0.25±0.05
A
B
BA
0.05
Technical Note
25/25
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
www.rohm.com 2011.03 – Rev.
A
© 2011 ROHM Co., Ltd. All rights reserved.
∗
Order quantity needs to be multiple of the minimum quantity.
<Tape and Reel information>
Embossed carrier tapeTape
Quantity
Direction
of feed 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
3000pcs
E2
()
Direction of feed
Reel 1pin
(Unit : mm)
VCSP50L2
(BD88420GUL)
2.10±0.05
1PIN MARK
2.10±0.05
0.55MAX
0.1±0.05
S
0.06 S
3
0.30±0.05
2
(φ0.15)INDEX POST
4
C
1
0.30±0.05
B
A
P=0.5×3
P=0.5×3
D
14-φ0.25±0.05
A
B
BA
0.05
R1120
A
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© 2011 ROHM Co., Ltd. All rights reserved.
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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
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