technical note speaker /headphone amplifiers series 1.1w to1.5w monaural speaker amplifiers bh7824fvm, bh7826fvm description the bh7824fvm and bh7826fvm are speaker amplifier ics for low-voltage drives and low power consumption audio, specialized for mobile telephones and other mobile audio devices. features 1) btl monaural speaker amplifier 2) capable of high power 500mw/8 ? /btl output 3) wide power supply voltage range 4) supports active/shutdown modes 5) built-in anti-pop circuit 6) built-in thermal shutdown circuit applications mobile telephones, pdas, notebook computers, dsc, dvc, and other mobile audio devices. product lineup part no. bh7824fvm bh7826fvm input type unbalanced input balanced input supply voltage(v) 2.4 5.5 2.6 5.5 oct. 2005
2/8 absolute maximum ratings ta=25c parameter symbol limits unit supply voltage v cc max. 6.0 v power dissipation pd 470(*1) mw operating temperature topr -30 +85(*2) c storage temperature tstg -55 +125 c *1 reduced by 4.7 mw/ ? c at 25 ? c or higher, when mounted on a 70mm70mm1.6mm pcb board. *2 topr=70c 85c is the range for performing basic operations and does not guarantee characteristics or rated output. moreover, tsd (thermal shutdown) may become operable if i nput signals occurring in this range are excessive. fig.1 ta-pd (when mounted on a pcb board) operating range ta=25c part no. bh7824fvm bh7826fvm supply voltage 2.4v 5.5v 2.6 5.5 * note: this ic is not designed to be radiation-resistant. electrical characteristics unless otherwise noted ta=25c, vcc=3.6v, f=1khz, rl=8 ? parameter symbol typ. unit conditions ba7824fvm ba7826fvm circuit current 1 i cc1 3.5 3.5 ma no signal active mode circuit current 2 i cc2 0 0 a no signal suspend mode voltage gain 1 g v1 +11.5 +11.5 db v in =-20dbv,1st opamp gain voltage gain 2 g v2 0 D db 2nd opamp gain maximum output voltage1 v om1 +6.0 +6.0 dbv dstn=1 btl *1 maximum output voltage2 v om2 D +5.1 dbv v cc =3.4v,dstn=1%,btl *1 output distortion d stn 0.07 0.2 v in =-20dbv se *1 output noise level v no -94 -94 dbv no signal, se active mode *2 suspend attenuation g s -107 -107 dbv v in =-20dbv btl *2 bias setting voltage v bias 1.8 1.8 v 3pin dc voltage suspend hold voltage h v sh1 v cc 0.8 v cc 2.0 v cc v active mode, hold voltage suspend hold voltage l v sh2 0 0.5 0 0.5 v suspend mode, hold voltage *1 b.w.=0.4 30khz *2 din audio 0 100 200 300 400 500 0 50 100 150 temperature ta[ ] power dissipation pd[mw]
3/8 measurement circuit fig.2 bh7824fvm fig.3 bh7826fvm block diagram fig.4 bh7824fvm fig.5 bh7826fvm a/s bias 1 2 3 4 8 7 6 5 8 0.1 100 100k 22k 0.1 600 0.1 v v 1.0 a/s suspend ctrl bias out bias in sp in sp out 1 v cc gnd sp out 2 1 2 3 4 8 7 6 5 bias sp in 2 suspend ctrl bias sp in 1 sp out 1 v cc gnd sp out 2 8 7 5 a/s bias 1 2 3 4 6 100k 100k 0.1 1 22 k 600 5 7 a/s bias 1 2 3 4 6 8 22 k 600 0.1 v cc 8 v 100 v 0.1 v in2 v in1
4/8 equivalent circuit pin no. bh7824fvm bh7826fvm pin name equivalent circuit pin name equivalent circuit 1 suspend ctrl suspend ctrl 2 bias out bias out 3 bias in bias in 4 sp in sp in 5 sp out1 sp out1 6 v cc v cc 7 gnd gnd 8 sp out2 sp out2 note: numerical values in figures are design values, and do not guarantee ratings. 01 100k 50k 50k 01 1k 02 487k 30k 30k 02 100k 04 1k 05 30k 03 30k 57k 30k 03 30k 150k 04 1k 05 08 08
5/8 application circuit bh7824fvm fig.6 bh7826fvm fig.7 bias a/s r1 r2 06 05 07 08 01 02 03 04 co co suspend sp_in(l+r) cf speaker r1 speaker suspen sp_in cf sp_in 01 02 03 04 08 07 06 05 1 r2 1 cf bias 0.1 0.1 r1 r2
6/8 cautions on use 1) set within the ranges below. 2) do not use this ic without a load. 3) do not connect a capacitive load greater than 100 pf between an output pin (pin 5 or 8) and gnd. because of the multiple feedback configur ation, if a large capacitive load were connected, the amplifier might oscillate. 4) this ic is compatible with dynamic speaker loads (8/12/16 ? : bh7824fvm, 8/12 ? : bh7826fvm) and is not compatible with loads other than these mentioned. 5) a soft mute setting becomes effective on connecting a resi stor and capacitor to the su spend pin (1pin: bh7824fvm, 2pin: bh7826fvm). item 8, 12 ? speaker 16 ? speaker bh7824fvm/26fvm bh7824fvm r1 10k ? Q r1 Q 120k ? r2 47k ? Q r1 Q 120k ? cf cf Q 560pf (g +6db) cf Q 270pf(0 g Q +6db) co co Q 100pf co Q 47pf fcutoff fcutoff Q 4khz fcutoff 1/(2 r 2 cf ) [hz] recommend r 100k ? c 0.47 f fig.8 bh7824fvm soft mute 1 r c v cc
7/8 reference data 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 trans ient 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 ma ximum 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 s horts 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 9 10 11 12 13 2.4 2.8 3.2 3.6 4 4.4 4.8 5.2 5.6 supply voltage : v cc [v] voltage gain : gv[db] 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 2.4 2.8 3.2 3.6 4 4.4 4.8 5.2 5.6 supply voltage : v cc [v] circuit current : iccs[ua] 0 2 4 6 8 10 12 14 2.4 2.8 3.2 3.6 4 4.4 4.8 5.2 5.6 supply voltage : v cc [v] circuit current : icca[ma] 0.01 0.1 1 02468 supply voltage : v cc [v] total harmonic distortion : thd[%] fig.9 circuit current (active) vs supply voltage fig.10 circuit current (suspend) vs supply voltage fig.11 voltage gain vs supply voltage fig.12 total harmonic distortion vs supply voltage
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. p lease 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 a s 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 o f 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 selection of order type catalog no.05t341be '05.10 rohm c msop8 embossed carrier tape tr (correct direction: 1pin of product should be at the upper left when you hold reel on the left hand, and you pull out the tape on the right hand) tape quantity direction of feed 3000 p cs (unit:mm) 4 1 5 8 2.9 0.1 0.475 0.22 0.65 4.0 0.2 0.6 0.2 0.29 0.15 2.8 0.1 0.75 0.05 0.08 0.05 0.9max. 0.08 s + 0.05 ? 0.04 0.145 + 0.05 ? 0.03 0.08 m x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x reel 1pin orders are available in complete units only. direction of feed part no. bh7824fvm bh7826fvm tape and reel information r t 7 8 2 4 h b f vm
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. appendix1-rev2.0 thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact your nearest sales office. rohm customer support system the americas / europe / asia / japan contact us : webmaster@ rohm.co. jp www.rohm.com copyright ? 2008 rohm co.,ltd. the products listed in this document are designed to be used with ordinary electronic equipment or de vices (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. 21 saiin mizosaki- cho, ukyo-ku, kyoto 615-8585, japan tel : +81-75-311-2121 fax : +81-75-315-0172 appendix
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