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1/10 www.rohm.com 2014.04 - rev.b ? 2014 rohm co., ltd. all rights reserved. class-ab speaker amplifiers 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 bi-cmos process is used. this ic supports: headphone amplifier gain adjustment, active/suspend switching, speaker amplifier stereo/monaural switching, and am plifier mute switching. all functions are contro llable from a microcontroller. built-in digit al 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 specificat ions (9 ma typ. in active mode, 0.2 a typ. in suspend mode) applications notebook computers, lcd tvs, etc. absolute maximum ratings (ta=25 ) parameter ratings unit supply voltage +6.0 v power dissipation 1100 *1 mw storage temperature -55 ~ +125 operating temperature -10 ~ +70 *1 reduced by 11 mw/ at 25 or higher, when mounting on a 70mmx70mmx1.6mm pcb board). operating conditions (ta=25 ) parameter ratings unit supply voltage +3.0~+5.5 v * this ic is not designed to be radiation-resistant. no.14077ebt06 downloaded from: http:///
technical note 2/10 www.rohm.com 2014.04 - rev.b ? 2014 rohm co., ltd. all rights reserved. BH7884EFV electrical characteristics (unless otherwise noted, v cc =3.3v, ta=25 , f=1khz) parameter symbol limits unit condition min. typ. max. 1 chip circuit current actv ia - 9.0 18.0 ma no signal active circuit current spnd is - 0.2 10.0 a no signal suspend sp amp voltage gain1 g sp 1 9.0 12.0 15.0 db se, vin=-18dbv,rl=8 ? voltage gain2 g sp 2 15.2 18.2 21.2 db btl, vin=-18dbv distortion d sp - 0.1 1.0 % btl, vin=-18dbv maximum output level v osp 2.2 5.2 - dbv btl, dsp=1% output noise level v nsp - -97 -80 dbv se, din-audio cross talk ct sp - -90 -80 dbv se, vin=-18dbv, din-audio output level on mute mt sp - -102 -80 dbv btl, vin=-18dbv hp amp voltage gain 3 g hp 2.6 5.6 8.6 db vol:max, r l =10k ? ,vin=-12dbv voltage gain 4 g hp -10 -7 -4 db vol:max, r l =32 ? ,vin=-12dbv distortion d hp - 0.025 0.1 % vol:max, r l =32 ? ,vin=-8dbv variable width of volume g hp 70 100 - db vol:min ~ max, rl=32 ? maximum output level v ohp -2.0 1.0 - dbv vol:max, dhp=1%, rl=10k ? output noise level v nhp - -98 -80 dbv vol:max, r l =32 ? , din-audio cross talk ct hp - -98 -80 dbv vol:max, r l =32 ? ,vin=-12dbv din-audio output level on mute mt hp - -110 -80 dbv vol:max, r l =32 ? ,vin=-12dbv din-audio beep amp output voltage level v bp 0.8 1.25 - vpp vin=1.3dbv, f=1khz, 20mhzlpf bias output voltage level v bias 1.4 1.7 2.0 v no signal ctrl active mode v 11h v cc -0.3 - v cc v active mode. hold voltage of 11pin. suspend mode v 11l gnd - 0.3 v suspend mode. hold voltage of 11pin. sp/on mode v 2h v cc -0.3 - v cc v sp / on mode. hold voltage of 2pin. sp/off mode v 2l gnd - 0.3 v sp/off mode. hold voltage of 2pin. bass-boost/on mode v 4h v cc -0.7 - v cc v sp / bass boost mode. hold voltage of 4pin. bass-boost/off mode v 4l gnd - 0.7 v sp / non boost mode. hold voltage of 4pin. stereo mode v 3h v cc -0.7 - v cc v sp / stereo mode. hold voltage of 3pin. mono mode v 3l gnd - 0.7 v sp / mono mode. hold voltage of 3pin. active mode v 10h v cc -0.7 - v cc v hp / active mode. hold voltage of 10pin. mute mode v 10l gnd - 0.7 v hp / mute mode. hold voltage of 10pin. psrr ripple rejection ratio g pr - -64 - dbv f=100hz, 0.3vpp, sin input spout monitor, din-audio downloaded from: http:///
technical note 3/10 www.rohm.com 2014.04 - rev.b ? 2014 rohm co., ltd. all rights reserved. BH7884EFV block diagram fig.1 downloaded from: http:///
technical note 4/10 www.rohm.com 2014.04 - rev.b ? 2014 rohm co., ltd. all rights reserved. BH7884EFV control pin settings sp mute pin:2pin h sp active spamp is in active state l sp mute spamp is in suspend state stereo/mono pin:3pin h stereo for spamp, lch and rch both are in active state l mono 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 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 downloaded from: http:///
technical note 5/10 www.rohm.com 2014.04 - rev.b ? 2014 rohm co., ltd. all rights reserved. BH7884EFV equivalent circuit pin1 sp_in_lch pin2 sp_mute pin3 st/mn pin4 bass boost pin5 line_in_lch pin6 bias pi n7 beep_in pin8 line_in_rch pin9 hp_vol pin10 hp_mute pin11 suspend pin12 sp_in_rch 27k 60k 16k 47k downloaded from: http:///
technical note 6/10 www.rohm.com 2014.04 - rev.b ? 2014 rohm co., ltd. all rights reserved. BH7884EFV pin13 hp_out_rch pin14 vcc_rch pin15 boost_r_rch pin16 spout1_rch 25k 5k pin17 spout2_rch pin18 gnd_r ch pin19 gnd_lch pin20 spout2_lch 25k 5k 25k 5k pin21 spout1_lch pin22 boost_r_lc h pin23 vcc_lch pin24 hp_out_lch 25k 5k downloaded from: http:///
technical note 7/10 www.rohm.com 2014.04 - rev.b ? 2014 rohm co., ltd. all rights reserved. BH7884EFV application circuit fig.2 downloaded from: http:///
technical note 8/10 www.rohm.com 2014.04 - rev.b ? 2014 rohm co., ltd. all rights reserved. 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: db r 5 (or r 8 ) g hp = 20 log 40k 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: ? ) 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: g spb = 20log r 1 (or r 12 ) 40k + r 21-20 (or r 16-15 ) (db) the cut-off frequency in bassboost is generally calculated by the following equation: 1 f cb = 2 c 21 22 (or c 16 15 )r 21 20 (or r 16 15 ) the voltage gain in nonboost is generally calculated by the following equation: g sp =20log 40k r 1 (or r 12 ) (db) 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 t he 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 refere nce values, whose val ues are not guaranteed. downloaded from: http:///
technical note 9/10 www.rohm.com 2014.04 - rev.b ? 2014 rohm co., ltd. all rights reserved. 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 circui ts 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 r egarding 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 off on) (vcc on off) vcc spnd hpmt spmt vcc spnd hpmt spmt 1) off l l l 1) off h h h 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 ? 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. downloaded from: http:///
technical note 10/10 www.rohm.com 2014.04 - rev.b ? 2014 rohm co., ltd. all rights reserved. BH7884EFV ordering part number b h 7 8 8 4 e f v - e 2 part no. part no. package efv: htssop-b24 packaging and forming specification e2: embossed tape and reel (unit : mm) htssop-b24 0.65 1.0max 0.85 0.05 0.08 0.05 0.24 +0.05 - 0.04 0.08 m s 0.08 1.0 0.2 0.53 0.15 0.17 +0.05 - 0.03 4 + 6 4 s 24 13 11 2 0.325 (3.4) (5.0) 7.8 0.1 7.6 0.2 5.6 0.1 (max 8.15 include burr) 1pin mark ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape (with dry pack) tapequantity 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 2000pcs e2 () direction of feed reel 1pin downloaded from: http:///
datasheet datasheet notice - ge rev.002 ? 2014 rohm co., ltd. all rights reserved. notice precaution on using rohm products 1. our products are designed and manufac tured for application in ordinary elec tronic equipments (such as av equipment, oa equipment, telecommunication equipment, home electroni c appliances, amusement equipment, etc.). if you intend to use our products in devices requiring ex tremely high reliability (such as medical equipment (note 1) , transport equipment, traffic equipment, aircraft/spacecra ft, nuclear power controllers, fuel c ontrollers, car equipment including car accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or serious damage to property (specific applications), please consult with the rohm sale s representative in advance. unless otherwise agreed in writing by rohm in advance, rohm shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of any ro hms products for specific applications. (note1) medical equipment classification of the specific applications japan usa eu china class class class b class class class 2. rohm designs and manufactures its products subject to strict quality control system. however, semiconductor products can fail or malfunction at a certain rate. please be sure to implement, at your own responsibilities, adequate safety measures including but not limited to fail-safe desi gn against the physical injury, damage to any property, which a failure or malfunction of our products may cause. the following are examples of safety measures: [a] installation of protection circuits or other protective devices to improve system safety [b] installation of redundant circuits to reduce the impact of single or multiple circuit failure 3. our products are designed and manufactured for use under standard conditions and not under any special or extraordinary environments or conditio ns, as exemplified below. accordin gly, rohm shall not be in any way responsible or liable for any damages, expenses or losses arising from the use of an y rohms products under any special or extraordinary environments or conditions. if you intend to use our products under any special or extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of product performance, reliability, etc, prior to use, must be necessary: [a] use of our products in any types of liquid, incl uding water, oils, chemicals, and organic solvents [b] use of our products outdoors or in places where the products are exposed to direct sunlight or dust [c] use of our products in places where the products ar e exposed to sea wind or corrosive gases, including cl 2 , h 2 s, nh 3 , so 2 , and no 2 [d] use of our products in places where the products are exposed to static electricity or electromagnetic waves [e] use of our products in proximity to heat-producing components, plastic cords, or other flammable items [f] sealing or coating our products with resin or other coating materials [g] use of our products without cleaning residue of flux (ev en if you use no-clean type fluxes, cleaning residue of flux is recommended); or washing our products by using water or water-soluble cleaning agents for cleaning residue after soldering [h] use of the products in places subject to dew condensation 4. the products are not subjec t to radiation-proof design. 5. please verify and confirm characteristics of the final or mounted products in using the products. 6. in particular, if a transient load (a large amount of load applied in a short per iod of time, such as pulse. is applied, confirmation of performance characteristics after on-boar d mounting is strongly recomm ended. avoid applying power exceeding normal rated power; exceeding the power rating under steady-state loading c ondition may negatively affect product performance and reliability. 7. de-rate power dissipation (pd) depending on ambient temper ature (ta). when used in seal ed area, confirm the actual ambient temperature. 8. confirm that operation temperat ure is within the specified range described in the product specification. 9. rohm shall not be in any way responsible or liable for fa ilure induced under deviant condi tion from what is defined in this document. precaution for mounting / circuit board design 1. when a highly active halogenous (chlori ne, bromine, etc.) flux is used, the resi due of flux may negatively affect product performance and reliability. 2. in principle, the reflow soldering method must be used; if flow soldering met hod is preferred, please consult with the rohm representative in advance. for details, please refer to rohm mounting specification downloaded from: http:///
datasheet datasheet notice - ge rev.002 ? 2014 rohm co., ltd. all rights reserved. precautions regarding application examples and external circuits 1. if change is made to the constant of an external circuit, pl ease allow a sufficient margin considering variations of the characteristics of the products and external components, including transient characteri stics, as well as static characteristics. 2. you agree that application notes, re ference designs, and associated data and in formation contained in this document are presented only as guidance for products use. theref ore, in case you use such information, you are solely responsible for it and you must exercise your own independent verification and judgment in the use of such information contained in this document. rohm shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of such information. precaution for electrostatic this product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. please take proper caution in your manufacturing process and storage so that voltage exceeding t he products maximum rating will not be applied to products. please take special care under dry condit ion (e.g. grounding of human body / equipment / solder iron, isolation from charged objects, se tting of ionizer, friction prevention and temperature / humidity control). precaution for storage / transportation 1. product performance and soldered connections may deteriora te if the products are stor ed in the places where: [a] the products are exposed to sea winds or corros ive gases, including cl2, h2s, nh3, so2, and no2 [b] the temperature or humidity exceeds those recommended by rohm [c] the products are exposed to di rect sunshine or condensation [d] the products are exposed to high electrostatic 2. even under rohm recommended storage c ondition, solderability of products out of recommended storage time period may be degraded. it is strongly recommended to confirm sol derability before using products of which storage time is exceeding the recommended storage time period. 3. store / transport cartons in the co rrect direction, which is indicated on a carton with a symbol. otherwise bent leads may occur due to excessive stress applied when dropping of a carton. 4. use products within the specified time after opening a humidity barrier bag. baking is required before using products of which storage time is exceeding the recommended storage time period. precaution for product label qr code printed on rohm products label is for rohms internal use only. precaution for disposition when disposing products please dispose them proper ly using an authorized industry waste company. precaution for foreign exchange and foreign trade act since our products might fall under cont rolled goods prescribed by the applicable foreign exchange and foreign trade act, please consult with rohm representative in case of export. precaution regarding intellectual property rights 1. all information and data including but not limited to application example contained in this document is for reference only. rohm does not warrant that foregoi ng information or data will not infringe any intellectual property rights or any other rights of any third party regarding such information or data. rohm shall not be in any way responsible or liable for infringement of any intellectual property rights or ot her damages arising from use of such information or data.: 2. no license, expressly or implied, is granted hereby under any intellectual property rights or other rights of rohm or any third parties with respect to the information contained in this document. other precaution 1. this document may not be reprinted or reproduced, in whol e or in part, without prior written consent of rohm. 2. the products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written consent of rohm. 3. in no event shall you use in any wa y whatsoever the products and the related technical information contained in the products or this document for any military purposes, incl uding but not limited to, the development of mass-destruction weapons. 4. the proper names of companies or products described in this document are trademarks or registered trademarks of rohm, its affiliated companies or third parties. downloaded from: http:///
datasheet datasheet notice C we rev.001 ? 2014 rohm co., ltd. all rights reserved. general precaution 1. before you use our pro ducts, you are requested to care fully read this document and fully understand its contents. rohm shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny rohms products against warning, caution or note contained in this document. 2. all information contained in this docume nt is current as of the issuing date and subj ec t to change without any prior notice. before purchasing or using rohms products, please confirm the la test information with a rohm sale s representative. 3. the information contained in this doc ument is provi ded on an as is basis and rohm does not warrant that all information contained in this document is accurate an d/or error-free. rohm shall not be in an y way responsible or liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or concerning such information. downloaded from: http:///

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