Rohm BH7884EFV 1w1w stereo speaker / headphone amplifier Datasheet

Class-AB Speaker Amplifiers
1W+1W Stereo
Speaker / Headphone Amplifier
BH7884EFV
No.10077EAT06
●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
Ratings
Unit
+6.0
V
1100 *1
mW
Storage temperature
-55 ~ +125
℃
Operating temperature
-10 ~ +70
℃
Supply voltage
Power dissipation
*1 Reduced by 11 mW/℃ at 25℃ or higher, when mounting on a 70mmX70mmX1.6mm PCB board).
●Operating Conditions (Ta=25℃)
Parameter
Supply voltage
*
Ratings
Unit
+3.0~+5.5
V
This IC is not designed to be radiation-resistant.
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1/10
2010.06 - Rev.A
Technical Note
BH7884EFV
●Electrical characteristics (Unless otherwise noted, VCC=3.3V, Ta=25℃, f=1kHz)
Limits
Parameter
Symbol
Unit
Min.
Typ.
Max.
■1 CHIP
Condition
Circuit current ACTV
IA
-
9.0
18.0
mA
No signal ACTIVE
Circuit current SPND
Is
-
0.2
10.0
µA
No signal
Voltage gain1
GSP1
9.0
12.0
15.0
dB
SE, Vin=-18dBV,RL=8Ω
Voltage gain2
GSP2
15.2
18.2
21.2
dB
BTL, Vin=-18dBV
Distortion
DSP
-
0.1
1.0
%
BTL, Vin=-18dBV
Maximum output level
VOSP
2.2
5.2
-
dBV
BTL, DSP=1%
Output noise level
VNSP
-
-97
-80
dBV
SE, DIN-Audio
Cross talk
CTSP
-
-90
-80
dBV
SE, Vin=-18dBV, DIN-Audio
Output level on mute
MTSP
-
-102
-80
dBV
BTL, Vin=-18dBV
Voltage gain 3
GHP
2.6
5.6
8.6
dB
VOL:MAX, RL=10kΩ,Vin=-12dBV
Voltage gain 4
GHP
-10
-7
-4
dB
VOL:MAX, RL=32Ω,Vin=-12dBV
Distortion
DHP
-
0.025
0.1
%
VOL:MAX, RL=32Ω,Vin=-8dBV
Variable width of volume
ΔGHP
70
100
-
dB
VOL:MIN ~ MAX, RL=32Ω
Maximum output level
VOHP
-2.0
1.0
-
dBV
VOL:MAX, DHP=1%, RL=10kΩ
Output noise level
VNHP
-
-98
-80
dBV
VOL:MAX, RL=32Ω, DIN-Audio
Cross talk
CTHP
-
-98
-80
dBV
Output level on mute
MTHP
-
-110
-80
dBV
VBP
0.8
1.25
-
Vpp
VBIAS
1.4
1.7
2.0
V
ACTIVE mode
V11H
VCC-0.3
-
VCC
V
SUSPEND mode
V11L
GND
-
0.3
V
SP/ON mode
V2H
VCC-0.3
-
VCC
V
SP/OFF mode
V2L
GND
-
0.3
V
BASS-BOOST/ON mode
V4H
VCC-0.7
-
VCC
V
BASS-BOOST/OFF mode
V4L
GND
-
0.7
V
STEREO mode
V3H
VCC-0.7
-
VCC
V
MONO mode
V3L
GND
-
0.7
V
ACTIVE mode
V10H
VCC-0.7
-
VCC
V
MUTE mode
V10L
GND
-
0.7
V
GPR
-
-64
-
dBV
SUSPEND
■SP AMP
■HP AMP
VOL:MAX, RL=32Ω,Vin=-12dBV
DIN-Audio
VOL:MAX, RL=32Ω,Vin=-12dBV
DIN-Audio
■BEEP AMP
Output voltage level
Vin=1.3dBV, f=1kHz, 20MHzLPF
■BIAS
Output voltage level
No Signal
■CTRL
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.
■PSRR
Ripple rejection ratio
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2/10
f=100Hz, 0.3Vpp, SIN Input
SPOUT monitor, DIN-Audio
2010.06 - Rev.A
Technical Note
BH7884EFV
●Block diagram
Fig.1
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3/10
2010.06 - Rev.A
Technical Note
BH7884EFV
●Control pin settings
SP MUTE PIN:2PIN
H
SP ACTIVE
L
SP MUTE
SPAMP is in active state
SPAMP is in suspend state
STEREO/MONO PIN:3PIN
H
STEREO
L
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
BASS BOOST
For SPAMP, bass is boosted
L
NON -BOOST
For SPAMP, bass is not boosted
MUTE PIN:10PIN
(The SPAMP mute function is realized by connecting HP_OUT to SP_IN)
H
ACTIVE
HPAMP is in active state
L
MUTE
HPAMP is in mute state
SUSPEND PIN:11PIN
H
ACTIVE
The IC is in active state
L
SUSPEND
The IC is in suspend state
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4/10
2010.06 - Rev.A
Technical Note
BH7884EFV
●Equivalent circuit
PIN1
SP_IN_LCH
PIN2
SP_MUTE
100k
PIN5
LINE_IN_LCH
PIN6
50
ST/MN
100k
BIAS
50k
PIN3
100k
PIN7
PIN4
100k
100k
BEEP_IN
HP_VOL
PIN10
100k
PIN8
LIHE_IN_RCH
47k
16k
50
100k
27k
60k
35k
PIN9
BASS BOOST
HP_MUTE
PIN11
100k
SUSPEND
100k
PIN12
SP_IN_RCH
100k
100k
100k
1k
100k
PIN13
HP_OUT_RCH
PIN14
VCC_RCH
PIN15
40k
25k
12
7.5k
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BOOST_R_RCH
5/10
40k
16
15
PIN16
SPOUT1_RCH
25k
7.5k
2010.06 - Rev.A
Technical Note
BH7884EFV
PIN17
PIN21
SPOUT2_RCH
PIN18
GND_RCH
PIN19
GND_LCH
PIN20
SPOUT2_LCH
25k
25k
7.5k
7.5k
SPOUT1_LCH
PIN22
25k
7.5k
BOOST_R_LCH
40k
1
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© 2010 ROHM Co., Ltd. All rights reserved.
40k
PIN23
21
VCC_LCH
PIN24
HP_OUT_LCH
30k
22
7.5k
6/10
2010.06 - Rev.A
Technical Note
BH7884EFV
●Application circuit
Fig.2
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7/10
2010.06 - Rev.A
Technical Note
BH7884EFV
●Description of operations
1) LINEIN (5,8PIN) ~ HPOUT (13,24PIN) voltage gain
The voltage gain at EVRMAX is generally calculated by the following equation:
40k
GHP = 20 × log
(dB)
R5(or R8)
The above gain attenuates according to the DC voltage of the VOL pin (9PIN).
By connecting multiple resistances (R), mixing input can be handled.
2) BEEPIN (7PIN) ~ HPOUT (13,24PIN)
When a pulse waveform is input at the BEEPIN pin, a pulse wave is output at HPOUT (24,13PIN).
The output level, determined by the resistance of 7PIN, has default values as follows:
HP OUT level
Vcc=5V
Vcc=4V
Vcc=3.3V
1Vpp<
<56k
<91k
<120k
0.5Vpp
68k
110k
160k
0.25Vpp
75k
130k
200k
*(Unit: Ω)
To obtain the default setting output (approx. 1.2 Vpp output), make R7=10 kΩ.
The variation in output levels is small.
Signals below a certain level are determined to be noise, by IC internals, and are not output at HPOUT.
3) SP IN (1,12PIN) ~ SP OUT (21, 20, 16,17PIN) voltage gain
The voltage gain in BASSBOOST is generally calculated by the following equation:
40k + R21-20(or R16-15)
(dB)
R1(or R12)
The cut-off frequency in BASSBOOST is generally calculated by the following equation:
1
fCB=
2πC21~22(or C16~15)×R21~20(or R16~15)
The voltage gain in NONBOOST is generally calculated by the following equation:
40k
(dB)
GSP=20×log
R1(or R12)
4) EVR control characteristic
HP AMP gain is controlled by the ratio of voltage to resistance between VCC and GND.
GSPB = 20×log
Note: A resistance (RN), shown above, is the resistance that is connected to pin N.
A capacitance (CN), shown above, is the capacitance that is connected to pin N.
The numeric values above are design reference values, whose values are not guaranteed.
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8/10
2010.06 - Rev.A
Technical Note
BH7884EFV
●Operation Notes
1. Numbers and data in entries are representative design values and are not guaranteed values of the items.
2. Although ROHM is confident that the example application circuit reflects the best possible recommendations, be sure to
verify circuit characteristics for your particular application. Modification of constants for other externally connected circuits
may cause variations in both static and transient characteristics for external components as well as this Rohm IC. Allow for
sufficient margins when determining circuit constants.
3. Absolute maximum ratings
Use of the IC in excess of absolute maximum ratings, such as the applied voltage or operating temperature range (Topr),
may result in IC damage. Assumptions should not be made regarding the state of the IC (short mode or open mode) when
such damage is suffered. A physical safety measure, such as a fuse, should be implemented when using the IC at times
where the absolute maximum ratings may be exceeded.
4. GND potential
Ensure a minimum GND pin potential in all operating conditions. Make sure that no pins are at a voltage below the GND at
any time, regardless of whether it is a transient signal or not.
5. Thermal design
Perform thermal design, in which there are adequate margins, by taking into account the permissible dissipation (Pd) in
actual states of use.
6. Short circuit between terminals and erroneous mounting
Pay attention to the assembly direction of the ICs. Wrong mounting direction or shorts between terminals, GND, or other
components on the circuits, can damage the IC.
7. Operation in strong electromagnetic field
Using the ICs in a strong electromagnetic field can cause operation malfunction.
8. Pop noise when switching power ON/OFF
To prevent pop noise when switching VCC ON/OFF or switching SUSPEND ON/OFF, use SUSPEND (11PIN=L), HP
MUTE (10PIN=L), and SUSPEND (2PIN=L) for noise control, as shown below.
(VCC ON→OFF)
(VCC OFF→ON)
VCC
1) OFF
SPND
HPMT
SPMT
L
L
L
1) OFF
H
H
H
VCC
SPND
HPMT
SPMT
2) ON
L
L
L
2) ON
H
H
L
3) ON
H
L
L
3) ON
H
L
L
4) ON
H
H
L
4) ON
L
L
L
5) ON
H
H
H
5) ON
L
L
L
9. Power supply bypass capacitor
Place the bypass capacitor close to the VCC ~ GND pins.
10. Mode switching
Do not apply a voltage that exceeds VCC or a voltage that is less than GND, at a control pin.
11. Power package
Ensure heat dissipation by connecting the heatsink to the back of the IC and to the GND board. Ensure that the GND area
is large.
12. HPOUT
Connect resistance (100 Ω is recommended) to the output for SPAMP input level adjustment and to prevent HPAMP
oscillation.
13. Capacitive load
Do not connect a capacitive load to SPAMP or HPAMP output as it may cause oscillation.
14. Startup time at low temperature and reduced power
Use the following methods to eliminate longer start up time at low temperatures (less than about -10℃) and reduced
power (less than about 3.0 V):
1) Start in SPMUTE state and then cancel SPMUTE.
2) Add to transistor and resistance, as shown in the application circuit diagram.
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9/10
2010.06 - Rev.A
Technical Note
BH7884EFV
●Ordering part number
B
H
7
Part No.
8
8
4
Part No.
E
F
V
-
Package
EFV: HTSSOP-B24
E
2
Packaging and forming specification
E2: Embossed tape and reel
HTSSOP-B24
<Tape and Reel information>
7.8±0.1
(MAX 8.15 include BURR)
(5.0)
1.0±0.2
0.53±0.15
(3.4)
1
0.325
Tape
Embossed carrier tape (with dry pack)
Quantity
2000pcs
Direction
of feed
E2
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
)
12
1PIN MARK
+0.05
0.17 -0.03
S
0.08±0.05
0.85±0.05
1.0MAX
+6°
4° −4°
13
5.6±0.1
7.6±0.2
24
0.65
0.08 S
+0.05
0.24 -0.04
0.08
1pin
M
Reel
(Unit : mm)
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10/10
Direction of feed
∗ Order quantity needs to be multiple of the minimum quantity.
2010.06 - Rev.A
Notice
Notes
No copying or reproduction of this document, in part or in whole, is permitted without the
consent of ROHM Co.,Ltd.
The content specified herein is subject to change for improvement without notice.
The content specified herein is for the purpose of introducing ROHM's products (hereinafter
"Products"). If you wish to use any such Product, please be sure to refer to the specifications,
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
be taken into account when designing circuits for mass production.
Great care was taken in ensuring the accuracy of the information specified in this document.
However, should you incur any damage arising from any inaccuracy or misprint of such
information, ROHM shall bear no responsibility for such damage.
The technical information specified herein is intended only to show the typical functions of and
examples of application circuits for the Products. ROHM does not grant you, explicitly or
implicitly, any license to use or exercise intellectual property or other rights held by ROHM and
other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the
use of such technical information.
The Products specified in this document are intended to be used with general-use electronic
equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices).
The Products specified in this document are not designed to be radiation tolerant.
While ROHM always makes efforts to enhance the quality and reliability of its Products, a
Product may fail or malfunction for a variety of reasons.
Please be sure to implement in your equipment using the Products safety measures to guard
against the possibility of physical injury, fire or any other damage caused in the event of the
failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM
shall bear no responsibility whatsoever for your use of any Product outside of the prescribed
scope or not in accordance with the instruction manual.
The Products are not designed or manufactured to be used with any equipment, device or
system which requires an extremely high level of reliability the failure or malfunction of which
may result in a direct threat to human life or create a risk of human injury (such as a medical
instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuelcontroller or other safety device). ROHM shall bear no responsibility in any way for use of any
of the Products for the above special purposes. If a Product is intended to be used for any
such special purpose, please contact a ROHM sales representative before purchasing.
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obtain a license or permit under the Law.
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More detail product informations and catalogs are available, please contact us.
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R1010A
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