Class-AB Speaker Amplifiers
1W+1W Stereo
Speaker / Headphone Amplifier
BH7884EFV
No.14077EBT06
●Description
The BH7884EFV is a low voltage, low noise, high output speaker and headphone amplifier drive, in which a Bi-CMOS
process is used. This IC supports: headphone amplifier gain adjustment, active/suspend switching, speaker amplifier
stereo/monaural switching, and amplifier mute switching. All functions are controllable from a microcontroller. Built-in digital
noise reduction circuits eliminate digital noise and BEEP sounds.
●Features
1) Built-in 1W+1W stereo speaker amplifier (Vcc=5V, RL=8Ω, THD=10%)
2) Built-in stereo headphone amplifier
3) Built-in bass boost function for speaker amplifier
4) Built-in low noise VCA (electronic volume) for headphone
5) Built-in mute circuit
6) Built-in standby circuit
7) Low current consumption specifications (9 mA TYP. in ACTIVE mode, 0.2
μA
TYP. in SUSPEND mode)
●Applications
Notebook computers, LCD TVs, etc.
●Absolute
maximum ratings(Ta=25℃)
Parameter
Supply voltage
Power dissipation
Storage temperature
Operating temperature
Ratings
+6.0
1100
*1
-55 ~ +125
-10 ~ +70
Unit
V
mW
℃
℃
*1 Reduced by 11 mW/℃ at 25℃ or higher, when mounting on a 70mmX70mmX1.6mm PCB board).
●Operating
Conditions
(Ta=25℃)
Parameter
Supply voltage
*
This IC is not designed to be radiation-resistant.
Ratings
+3.0~+5.5
Unit
V
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© 2014 ROHM Co., Ltd. All rights reserved.
1/10
2014.04 - Rev.B
BH7884EFV
●Electrical
characteristics
(Unless otherwise noted, V
CC
=3.3V, Ta=25℃, f=1kHz)
Limits
Parameter
Symbol
Unit
Min.
Typ.
Max.
■1
CHIP
Circuit current ACTV
Circuit current SPND
■SP
AMP
Voltage gain1
Voltage gain2
Distortion
Maximum output level
Output noise level
Cross talk
Output level on mute
■HP
AMP
Voltage gain 3
Voltage gain 4
Distortion
Variable width of volume
Maximum output level
Output noise level
Cross talk
Output level on mute
■BEEP
AMP
Output voltage level
■BIAS
Output voltage level
■CTRL
ACTIVE mode
SUSPEND mode
SP/ON mode
SP/OFF mode
BASS-BOOST/ON mode
BASS-BOOST/OFF mode
STEREO mode
MONO mode
ACTIVE mode
MUTE mode
■PSRR
Ripple rejection ratio
G
PR
-
-64
-
dBV
V
11H
V
11L
V
2H
V
2L
V
4H
V
4L
V
3H
V
3L
V
10H
V
10L
V
CC
-0.3
GND
V
CC
-0.3
GND
V
CC
-0.7
GND
V
CC
-0.7
GND
V
CC
-0.7
GND
-
-
-
-
-
-
-
-
-
-
V
CC
0.3
V
CC
0.3
V
CC
0.7
V
CC
0.7
V
CC
0.7
V
V
V
V
V
V
V
V
V
V
V
BIAS
1.4
1.7
2.0
V
No Signal
V
BP
0.8
1.25
-
Vpp
G
HP
G
HP
D
HP
ΔG
HP
V
OHP
V
NHP
CT
HP
MT
HP
2.6
-10
-
70
-2.0
-
-
-
5.6
-7
0.025
100
1.0
-98
-98
-110
8.6
-4
0.1
-
-
-80
-80
-80
dB
dB
%
dB
dBV
dBV
dBV
dBV
G
SP
1
G
SP
2
D
SP
V
OSP
V
NSP
CT
SP
MT
SP
9.0
15.2
-
2.2
-
-
-
12.0
18.2
0.1
5.2
-97
-90
-102
15.0
21.2
1.0
-
-80
-80
-80
dB
dB
%
dBV
dBV
dBV
dBV
IA
Is
-
-
9.0
0.2
18.0
10.0
mA
µA
Technical Note
Condition
No signal ACTIVE
No signal
SUSPEND
SE, Vin=-18dBV,RL=8Ω
BTL, Vin=-18dBV
BTL, Vin=-18dBV
BTL, DSP=1%
SE, DIN-Audio
SE, Vin=-18dBV, DIN-Audio
BTL, Vin=-18dBV
VOL:MAX, R
L
=10kΩ,Vin=-12dBV
VOL:MAX, R
L
=32Ω,Vin=-12dBV
VOL:MAX, R
L
=32Ω,Vin=-8dBV
VOL:MIN ~ MAX, RL=32Ω
VOL:MAX, DHP=1%, RL=10kΩ
VOL:MAX, R
L
=32Ω, DIN-Audio
VOL:MAX, R
L
=32Ω,Vin=-12dBV
DIN-Audio
VOL:MAX, R
L
=32Ω,Vin=-12dBV
DIN-Audio
Vin=1.3dBV, f=1kHz, 20MHzLPF
Active mode.
Hold Voltage of 11pin.
Suspend mode.
Hold Voltage of 11pin.
SP / ON mode.
Hold Voltage of 2pin.
SP/OFF mode.
Hold Voltage of 2pin.
SP / Bass Boost mode.
Hold Voltage of 4pin.
SP / Non Boost mode.
Hold Voltage of 4pin.
SP / STEREO mode.
Hold Voltage of 3pin.
SP / MONO mode.
Hold Voltage of 3pin.
HP / Active mode.
Hold Voltage of 10pin.
HP / MUTE mode.
Hold Voltage of 10pin.
f=100Hz, 0.3Vpp, SIN Input
SPOUT monitor, DIN-Audio
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© 2014 ROHM Co., Ltd. All rights reserved.
2/10
2014.04 - Rev.B
BH7884EFV
●Control
pin settings
SP MUTE PIN:2PIN
H
L
SP ACTIVE
SP MUTE
SPAMP is in active state
SPAMP is in suspend state
STEREO/MONO PIN:3PIN
H
L
STEREO
MONO
For SPAMP, LCH and RCH both are in active state
For SPAMP, LCH is in active state and RCH is in suspend state
BASSBOOST PIN:4PIN
H
L
BASS BOOST
NON -BOOST
For SPAMP, bass is boosted
For SPAMP, bass is not boosted
MUTE PIN:10PIN
H
L
ACTIVE
MUTE
HPAMP is in active state
HPAMP is in mute state
SUSPEND PIN:11PIN
H
L
ACTIVE
SUSPEND
The IC is in active state
The IC is in suspend state
Technical Note
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© 2014 ROHM Co., Ltd. All rights reserved.
4/10
2014.04 - Rev.B
Embedded System
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