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| www.rohm.com 2015.06 - rev.d ? 2015 rohm co., ltd. all rights reserved. 1/8 headphone amplifiers standard headphone amplifiers bh3544f,bh3547f,bh3548f description bh3544f, bh3547f, bh3548f are headphone amplifiers suitable for portable products. bh3544f, bh3547f, bh3548f has a fixed gain of 6 db. external resistors for gain setting are not needed. package of bh3544f, bh3547f, bh3548f is pin-to-pin compatible (sop8), enable to replace each other easily. bh3544f, bh3547f, bh3548f also has mute functions that make it easy to prevent pop noise when power supply turns on/off. moreover, thermal shutdown function is built-in.bh3544f, bh3547f can drive 16/32 ? load, bh3548f can drive 8/16/32 ? . so, bh3548f is suitable for 8 ? receiver. features 1) built-in mute function for preventing pop noise when power supply turns on/off 2) built-in thermal shutdown function 3) bh3544f, bh3547f, bh3548f are pin-to-pin compatible 4) sop8 small package applications tv, desktop pc, notebook pc, camcorder and other equipment having headphone output line up part no. bh3544f bh3547f bh3548f unit supply voltage +2.8 +6.5 +4.5 +6.5 +4.0 +5.5 v quiescent current 7.0 3.7 6.5 ma amplifier gain 6 db output [r l =16 ? ] 62 77 62 mw load impedance 16 / 32 8/16/32 ? operating temperature range -25 +75 -40 +85 absolute maximum ratings(ta=25c) parameter symbol ratings unit bh3544f,bh3547f,bh3548f applied voltage vcc 7.0 v power dissipation pd 550 *1 mw storage temperature ts t g - 5 5 +125 c *1 derating is done at 5.5mw/c above ta=25c. (when mounted on a 70mm 70mm1.6mm pcb board, fr4) operating conditions (ta=25c) parameter symbol limits unit bh3544f bh3547f bh3548f supply voltage vcc +2.8 +6.5 +4.5 +6.5 +4.0 +5.5 v temperature range topr -25 +75 -40 +85 * these product are not designed for protection against radioactive rays. no.15102ed t 02
www.rohm.com 2015.06 - rev.d ? 2015 rohm co., ltd. all rights reserved. technical note 2/8 bh3544f,bh3547f,bh3548f electrical characteristics (unless ot herwise noted, ta=25c,vcc=5v,rl=32 ? ,f=1khz,bw=400 30khz, vin =-6dbv) parameter symbol limits(typ.) unit conditions bh3544f bh3547f bh3548f quiescent current i q 7 3.7 6.5 ma v in =0vrms mute pin control voltage h v tmh 1.6< v mute off mute pin control voltage l v tml <0.3 v mute on gain g vc 6 db - gain difference between channels g vc 0 db - total harmonic distortion thd 0.02 0.05 0.02 % bw=20 20khz rated output 1 p o1 31 46 31 mw r l =32 ? ,thd<0.1% (bh3541f,bh3544f,bh3548f) r l =32 ? ,thd 0.3% (bh3547f) rated output 2 p o2 62 77 62 mw r l =16 ? ,thd<0.1% (bh3541f,bh3544f,bh3548f) r l =16 ? ,thd 0.5% (bh3547f) rated output 3 p o3 - 120 mw r l =8 ? ,thd 0.25% (bh3548f) output noise voltage v no -93 dbv bw=20 20khz,rg=0? channel separation cs -90 -87 -90 db rg=0 ? mute attenuation att -80 db rg=0 ? ripple rejection rr -57 db f rr =100hz,v rr =-20dbv input resistance rin 90 k ? - reference data bh3544f bh3544f bh3544f fig. 1 quiescent current vs. power supply voltage fig. 2 in dc current vs. power supply voltage fig. 3 output voltage vs. mute control voltage www.rohm.com 2015.06 - rev.d ? 2015 rohm co., ltd. all rights reserved. technical note 3/8 bh3544f,bh3547f,bh3548f reference data (continued) bh3544f bh3544f bh3544f ? 40 0.001 total harmonic distortion : thd (%) output voltage : v o (dbv) 0.01 10 ? 30 ? 20 ? 10 10 0.1 1 0 f ? 100h z f ? 1kh z f ? 10kh z ta ? 25 ? c r l ? 32 ? v cc ? 5v ? 40 0.001 total harmonic distortion : thd (%) output voltage: v o (dbv) 0.01 10 ? 30 ? 20 ? 10 10 0.1 1 0 f ? 100h z f ? 1kh z f ? 10kh z ta ? 25 ? c r l ? 32 ? v cc ? 3v fig. 4 voltage gain vs. frequency fig. 5 total harmonic distortion vs. output voltage (1) fig. 6 total harmonic distortion vs. output voltage (2) bh3544f bh3544f bh3544f fig. 7 total harmonic distortion vs. output voltage (3) fig. 8 total harmonic distortion vs. output voltage (4) fig. 9 channel separation vs. frequency bh3544f bh3544f bh3544f fig. 10 mute attenuation vs. frequency fig. 11 ripple rejection vs. frequency fig. 12 ripple rejection vs. power supply voltage total harmonic distortion : thd (%) total harmonic distortion : thd (%) www.rohm.com 2015.06 - rev.d ? 2015 rohm co., ltd. all rights reserved. technical note 4/8 bh3544f,bh3547f,bh3548f 5 6 7 8 3 4 v cc out2 bias in2 90k 90k 6db 6db bias mute t sd 2 1 out1 mute in1 gnd ? ? block diagram fig. 13 measurement circuit fig. 14 8 7 6 5 1 2 3 4 bias + + 90k 90k mute tsd 6db 6db r5 1 1 2 v in 2 sw5 47 in2 bias vcc cv cc 10 v 330 v 7ac 1 2 32 16 330 v 1 2 32 16 sw7 sw1 a iq sw8b 12 swba v rr v cc v 1ac out1 mute in1 gnd 1 1 2 v in 1 sw3 r3 out2 v tm www.rohm.com 2015.06 - rev.d ? 2015 rohm co., ltd. all rights reserved. technical note 5/8 bh3544f,bh3547f,bh3548f terminal equivalent circuit / description pin no. pin name i /o pin voltage equivalent circuit function bh3544f, bh3548f bh3547f 1 7 out1 out2 o 2.1v (vcc=5v) output pin 2 mute i 0.1v (when open) mute control pin active:hi mute:lo (open) 3 5 in1 in2 i 2.1v (vcc=5v) input pin 6 bias i/o 2.1v (vcc=5v) bias pin (since the 47 f externally attached capacitor also serves as the time constant for pop noise countermeasures, evaluate adequately when changing it.) 4 gnd i - - - gnd pin 8 vcc i - - - power supply pin the figure in the pin explanation and input/output equivalent circ uit is reference value, it doesn?t guarantee the value. 200k 2 vcc 190k 2 vcc bias 6 60k 60k vcc vcc bias 6 70k 64k vcc vcc 10k 1 7 1 7 10k 1 7 1 7 3 5 90k bias vcc 3 5 90k vcc bias www.rohm.com 2015.06 - rev.d ? 2015 rohm co., ltd. all rights reserved. technical note 6/8 bh3544f,bh3547f,bh3548f application circuit 5 6 7 8 3 4 v cc out2 bias in2 47 1 v in 2 90k 90k 6db 6db bias mute tsd 2 1 out1 mute in1 gnd 1 v in 1 1 100k 330 10 vmute h : active l : mute 330 v cc r5 c5 c6 c7 c8 c1 c2 c3 r3 r2 + + + + fig. 15 description of external components 1) input coupling capacitors (c3, c5) these are determined according to the lower cutoff frequency fc. moreover, since lowering the capacitance can cause the occurrence of pop noise, when changing this, determine it after adequate checking. since the input impedance is 90k ? , these are found by the expressions below, although drift, temperature characteristics, and other considerations are necessary. (layered ceramic capacitors are recommended.) c3(c5)=1/(2 90k ? fc) 2) bias capacitor (c6) when vcc=5v, 47 f is recommended. since lowering the capacitance too much can cause worsening of electrical characteristics or the occurrence of pop noise, when chan ging this, determine it after checking this adequately. 3) mute pin pop noise countermeasures (r2, c2) since bh3544f,bh3548f have an impedance of 190k ? against gnd and the bh3547f has 200k ? , it may be impossible to cancel mute mode if r2 is made too large. 4) output coupling capacitors (c1, c7) these are determined by the lower cutoff frequency. if r l is the output load resistance (assuming a resistance r x is put in for output protection or current restrict ion), these are found by the expression below. c1(c7)=1/(2 (r l +r ) fc) 5) input gain adjustment resistances (r3, r5) externally attached resistances (r3, r5) make input gain adjustment possible. the gain found by the expression below can be set. g vc =6+20log(90k ? /(90k ? +r3[r5])) [db] when input gain is not accommodated, these resistors have no use. www.rohm.com 2015.06 - rev.d ? 2015 rohm co., ltd. all rights reserved. technical note 7/8 bh3544f,bh3547f,bh3548f notes for use 1) numbers and data in entries are representative desi gn values and are not guarante ed values of the items. 2) although we are confident in recommending the sample applic ation circuits, carefully check their characteristics further when using them. when modifying externally attached compon ent constants before use, dete rmine them so that they have sufficient margins by taking into account variations in externally attached components and the rohm lsi, not only for static characteristics but also including transient characteristics. 3) absolute maximum ratings if applied voltage, operating temperatur e range, or other absolute maximum ratings are exceeded, the lsi may be damaged. do not apply voltages or temp eratures that exceed the absolute maximum ratings. if you think of a case in which absolute maximum ratings are exceeded, enforce fuses or other physical safety measures and investigate how not to apply the conditions under which absol ute maximum ratings are exceeded to the lsi. 4) gnd potential make the gnd pin voltage such that it is the lowest voltag e even when operating below it. actually confirm that the voltage of each pin does not become a lower volt age than the gnd pin, including transient phenomena. 5) thermal design perform thermal design in which there are adequate margins by taking into account the allowable power dissipation in actual states of use. 6) shorts between pins and misinstallation when mounting the lsi on a board, pay adeq uate attention to orientation and placem ent discrepancies of the lsi. if it is misinstalled and the power is turned on, the lsi may be damaged. it also may be dam aged if it is shorted by a foreign substance coming between pins of the lsi or between a pin and a power supply or a pin and a gnd. 7) operation in strong magnetic fields adequately evaluate use in a strong magnetic fiel d, since there is a possibility of malfunction. 8) pop noise countermeasures in order to prevent the pop noise that occurs when the power supply turns on or off, make the rise and fall with reference to the timing diagram shown below. 1)bh3544f/ bh3548f fig. 16 (a):mute period (use as pop noise countermeasure when power supply turns on/off by makingvmute=lo.) (b):mute cancellation period (this has a time constant becau se it is used by the externally attached c2 and r2 as a pop noise countermeasure on mute c ancellation, so be careful of the timing.) (c):mute start time (as on cancella tion, this has a time constant.) 2)bh3547f fig. 17 (a):before vcc rise (or at the same time as vcc) make mute cancelled (vmute=hi). (b):soft mute period (this time can be set by externally attached r2 and c2) vcc vmute out sg (i t (rise time) (play period) (fall period) (mute period) (a) (b) rise time play period rise time vcc out mute a bc a www.rohm.com 2015.06 - rev.d ? 2015 rohm co., ltd. all rights reserved. technical note 8/8 bh3544f,bh3547f,bh3548f ordering part number b h 3 5 4 4 f - e 2 part no. part no. 3544 3547 3548 package f: sop8 packaging and forming specification e2: embossed tape and reel ? order quantity needs to be multiple of the minimum quantity. datasheet d a t a s h e e t notice-pga-e rev.001 ? 2015 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, ro hm 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 hm?s 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 rohm?s 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 bel ow), 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 descr ibed 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 us ed on a surface-mount products, the flow soldering method must be used on a through hole mount products. if the flow sol dering method is preferred on a surface-mount products, please consult with the rohm representative in advance. for details, please refer to rohm mounting specification datasheet d a t a s h e e t notice-pga-e rev.001 ? 2015 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 c onsidering 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 indepen dent 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 hum idity 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 rohm?s 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 concerned goods might be fallen under listed items of export control prescribed by foreign exchange and foreign trade act, please consult with rohm in case of export. precaution regarding intellectual property rights 1. all information and data including but not limited to application example contain ed 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. 2. rohm shall not have any obligations where the claims, actions or demands arising from the co mbination of the products with other articles such as components, circui ts, systems or external equipment (including software). 3. 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 products or the informati on contained in this document. pr ovided, however, that rohm will not assert its intellectual property rights or other rights against you or your customers to the extent necessary to manufacture or sell products containing the produc ts, subject to the terms and conditions herein. 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. datasheet datasheet notice ? we rev.001 ? 2015 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. datasheet part number bh3544f package sop8 unit quantity 2500 minimum package quantity 2500 packing type taping constitution materials list inquiry rohs yes bh3544f - web page distribution inventory |
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