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TECHNICAL NOTE
Speaker /Headphone Amplifier Series
1W+1W Stereo Speaker / Headphone Amplifier
BH7884EFV
Description The BH7884EFV is a low voltage, low noise, high output speaker and headphone amplifier drive, in which a BiCMOS 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=8, 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 A TYP. in SUSPEND mode)
Applications Notebook computers, LCD TVs, etc.
Absolute maximum ratings(Ta=25C) Parameter Supply voltage Power dissipation Storage temperature Operating temperature Limits +6.0 1100 *1 -55 +125 -10 +70 Unit V mW C C
*1 Reduced by 11 mW/C at 25C or higher, when mounting on a 70mmX70mmX1.6mm PCB board).
Operating range (Ta=25C) Parameter Supply voltage Limits +3.0~+5.5 Unit V
* This IC is not designed to be radiation-resistant.
Oct. 2005
Electrical characteristics
(Unless otherwise noted, Vcc=3.3V, Ta=25C, f=1kHz) Specifications Min. 9.0 15.2 2.2 2.6 -10 70 -2.0 Typ. 9.0 0.2 12.0 18.2 0.1 5.2 -97 -90 -102 5.6 -7 0.025 100 1.0 -98 -98 -110 Max. 18.0 10.0 15.0 21.2 1.0 -80 -80 -80 8.6 -4 0.1 -80 -80 -80
Parameter 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
Symbol
Unit
Condition
IA Is GSP1 GSP2 DSP VOSP VNSP CTSP MTSP GHP GHP DHP GHP VoHP VNHP CTHP MTHP
mA A dB dB % dBV dBV dBV dBV dB dB % dB dBV dBV dBV dBV
No signal ACTIVE No signal SUSPEND SE, Vin=-18dBV,RL=8 BTL, Vin=-18dBV BTL, Vin=-18dBV BTL, DSP=1% SE, DIN-Audio SE, Vin=-18dBV, DIN-Audio BTL, Vin=-18dBV VOL:MAX, RL=10k,Vin=-12dBV VOL:MAX, RL=32,Vin=-12dBV VOL:MAX, RL=32,Vin=-8dBV VOL:MINMAX, RL=32 VOL:MAX, DHP=1%, RL=10k VOL:MAX, RL=32, DIN-Audio VOL:MAX, RL=32,Vin=-12dBV DIN-Audio VOL:MAX, RL=32,Vin=-12dBV DIN-Audio Vin=1.3dBV, f=1kHz, 20MHzLPF No Signal 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/BassBoost mode. Hold Voltage of 4pin. SP/NonBoost 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
VBP VBIAS
0.8 1.4 VCC -0.3 GND VCC -0.3 GND VCC -0.7 GND VCC -0.7 GND VCC -0.7 GND
1.25 1.7
2.0
Vpp V
V11H V11L V2H V2L V4H V4L V3H V3L V10H V10L
-
VCC 0.3 VCC 0.3 VCC 0.7 VCC 0.7 VCC 0.7
V V V V V V V V V V
GPR
-
-64
-
dBV
2/8
Block diagram
Fig.1
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 (The SPAMP mute function is realized by connecting HP_OUT to SP_IN) H L ACTIVE MUTE SUSPEND PIN:11PIN H L ACTIVE SUSPEND The IC is in active state The IC is in suspend state HPAMP is in active state HPAMP is in mute state
Equivalent circuit (1 of 2) 3/8
PIN1
SP_IN_LCH
PIN2
SP
MUTE
PIN3
ST/MN
PIN4
BASS BOOST
100k
100k
100k
100k
100k
100k
PIN5
LINE_IN_LCH
PIN6
BIAS
PIN7
BEEP_IN
PIN8
LIHE_IN_RCH
50
50k 35k
50 100k
16k
47k 27k
60k
PIN9
HP_VOL
PIN10
HP_MUTE
PIN11
SUSPEND
PIN12
SP_IN_RCH
100k 1k 100k
100k
100k
100k
100k
PIN13
HP_OUT_RCH
PIN14
VCC_RCH
PIN15
BOOST_R_RCH
PIN16
SPOUT1_RCH
25k 12 7.5k
40k
16
25k
40k
15
7.5k
4/8
Equivalent circuit (2 of 2)
PIN17
SPOUT2_RCH
PIN18
GND_RCH
PIN19
GND_LCH
PIN20
SPOUT2_LCH
25k
25k
7.5k
7.5k
PIN21
SPOUT1_LCH
PIN22
BOOST_R_LCH
PIN23
VCC_LCH
PIN24
HP_OUT_LCH
25k
40k 1
21
30k
7.5k
40k
22
7.5k
Application circuit
Fig.2
5/8
Description of operations 1) LINEIN (5,8PIN)HPOUT (13,24PIN) voltage gain The voltage gain at EVRMAX is generally calculated by the following equation:
GHP 20 log 40k (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 1Vpp< 0.5Vpp 0.25Vpp
Vcc=5V
<56k
Vcc=4V
<91k
Vcc=3.3V
<120k
68k 75k
110k 130k
160k 200k
Unit:
To obtain the default setting output (approx. 1.2 Vpp output), make R7=10 k. 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:
GSPB 20 log 40k R 2122 (or R1615 ) (dB) R1(or R12 )
The cut-off frequency in BASSBOOST is generally calculated by the following equation:
fCB 1 (HZ ) 2C21-22 (or C16-15 ) R21-22 (or R16-15 )
The voltage gain in NONBOOST is generally calculated by the following equation:
GSP 20 log 40 k (dB) R1 ( or R12 )
4) EVR control characteristic HP AMP gain is controlled by the ratio of voltage to resistance between VCC and GND. 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.
6/8
Operation Notes 1. 2. Numbers and data in entries are representative design values and are not guaranteed values of the items. 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. 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. 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. Thermal design Perform thermal design, in which there are adequate margins, by taking into account the permissible dissipation (Pd) in actual states of use. 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. Operation in strong electromagnetic field Using the ICs in a strong electromagnetic field can cause operation malfunction. 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 OFFON} 1) 2) 3) 4) 5) 9. 10. 11. VCC OFF ON ON ON ON SPND L L H H H HPMT L L L H H SPMT L L L L H 1) 2) 3) 4) 5) VCC OFF ON ON ON ON {VCC ONOFF} SPND H H H L L HPMT H H L L L SPMT H L L L L
3.
4.
5.
6.
7. 8.
12.
13. 14.
Power supply bypass capacitor Place the bypass capacitor close to the VCCGND pins. Mode switching Do not apply a voltage that exceeds VCC or a voltage that is less than GND, at a control pin. Power package Ensure a heat dissipation by connecting the heatsink to the back of the IC and to the GND board. Ensure that the GND area is large. HPOUT Connect resistance (100 is recommended) to the output for SPAMP input level adjustment and to prevent HPAMP oscillation. Capacitive load Do not connect a capacitive load to SPAMP or HPAMP output as it may cause oscillation. Startup time at low temperature and reduced power Use the following methods to eliminate longer start up time at low temperatures (less than about -10C) 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.
7/8
Selection of order type
B
H
7
8
8
4
E
F
V
E
2
Part No. BH7884EFV
Tape and Reel information
HTSSOP-B24

Tape Quantity
7.8 0.1
24 13
Embossed carrier tape 2000pcs 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)
4 +6 -4
0.53 0.15 1 0.2
7.6 0.2 5.6 0.1
Direction of feed
0.325
1.0Max. 0.85 0.05 0.08 0.05
1
12
0.17 +0.05 -0.03
1234
1234
1234
1234
1234
1234
1234
1234
0.08 S 0.65 0.2
+0.05 -0.04
0.08 M
Reel
1pin
Direction of feed
(Unit:mm)
When you order , please order in times the amount of package quantity.
The contents described herein are correct as of October, 2005 The contents described herein are subject to change without notice. For updates of the latest information, please contact and confirm with ROHM CO.,LTD. Any part of this application note must not be duplicated or copied without our permission. Application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. Please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. Any data, including, but not limited to application circuit diagrams and information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. ROHM CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by ROHM CO., LTD. is granted to any such buyer. The products described herein utilize silicon as the main material. The products described herein are not designed to be X ray proof.
Published by Application Engineering Group
8/8
Catalog No.05T374Be '05.10 ROHM
Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of ROHM CO.,LTD. The contents described herein are subject to change without notice. The specifications for the product described in this document are for reference only. Upon actual use, therefore, please request that specifications to be separately delivered. Application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. Please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. Any data, including, but not limited to application circuit diagrams information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. ROHM CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, no express or implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by ROHM CO., LTD. is granted to any such buyer. Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). Should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of which would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. It is our top priority to supply products with the utmost quality and reliability. However, there is always a chance of failure due to unexpected factors. Therefore, please take into account the derating characteristics and allow for sufficient safety features, such as extra margin, anti-flammability, and fail-safe measures when designing in order to prevent possible accidents that may result in bodily harm or fire caused by component failure. ROHM cannot be held responsible for any damages arising from the use of the products under conditions out of the range of the specifications or due to non-compliance with the NOTES specified in this catalog.
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