www.rohm.com 2011.04 - rev.b ? 2011 rohm co., ltd. all rights reserved. 1/8 conpact 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 +5.5 +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.11102ebt02
www.rohm.com 2011.04 - rev.b ? 2011 rohm co., ltd. all rights reserved. technical note 2/8 bh3544f,bh3547f,bh3548f electrical characteristics (unless otherwise 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% (bh3544f,bh3548f) r l =32 ? ,thd 0.3% (bh3547f) rated output 2 p o2 62 77 62 mw r l =16 ? ,thd<0.1% (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 2011.04 - rev.b ? 2011 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 2011.04 - rev.b ? 2011 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 2011.04 - rev.b ? 2011 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 mute on:hi mute off: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 2011.04 - rev.b ? 2011 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 necessa ry. (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 accommodat ed, these resistors have no use.
www.rohm.com 2011.04 - rev.b ? 2011 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 com ponent constants before use, det ermine 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 ra tings are exceeded, the lsi may be damaged. do not apply voltages or temper atures that exceed the absol ute 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 voltage 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 ar e 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 adequ ate 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 noi se 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 2011.04 - rev.b ? 2011 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. embossed carrier tape tape quantity 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 2500pcs e2 () direction of feed reel 1pin (unit : mm) sop8 0.9 0.15 0.3min 4 + 6 ? 4 0.17 +0.1 - 0.05 0.595 6 4 3 8 2 5 1 7 5.0 0.2 6.2 0.3 4.4 0.2 (max 5.35 include burr) 1.27 0.11 0.42 0.1 1.5 0.1 s 0.1 s
r1120 a www.rohm.com ? 2011 rohm co., ltd. all rights reserved. notice rohm customer support system http://www.rohm.com/contact/ thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact us. notes no copying or reproduction of this document, in part or in whole, is permitted without the consent of rohm co.,ltd. the content specied herein is subject to change for improvement without notice. the content specied 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 specications, 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 specied 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 specied herein is intended only to show the typical functions of and examples of application circuits for the produc ts. 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 specied in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, ofce-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specied 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, re or any other damage caused in the event of the failure of any product, such as derating, redundancy, re 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, fuel- controller 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. if you intend to export or ship overseas any product or technology specied herein that may be controlled under the foreign exchange and the foreign trade law, you will be required to obtain a license or permit under the law.
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