BH7826FVM

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/8Ω/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. Input type Supply voltage(V) BH7824FVM Unbalanced input 2.4～5.5 BH7826FVM Balanced input 2.6～5.5 Oct. 2005 ●Absolute maximum ratings（Ta=25°C） Parameter Supply voltage Power dissipation Operating temperature Storage temperature Symbol VCCmax. Pd Topr Tstg Limits 6.0 470(*1) -30～+85(*2) -55～+125 Unit V mW °C °C *1 Reduced by 4.7 mW/C at 25C or higher, when mounted on a 70mm×70mm×1.6mm PCB board. *2 Topr=70°C～85°C is the range for performing basic operations and does not guarantee characteristics or rated output. Moreover, TSD (Thermal Shutdown) may become operable if input signals occurring in this range are excessive. 500 Power dissipation Pd[mW] 400 300 200 100 0 0 50 100 150 Temperature Ta[℃] Fig.1 Ta-Pd (when mounted on a PCB board) ●Operating range（Ta=25°C） Part No. Supply voltage BH7824FVM 2.4V～5.5V BH7826FVM 2.6～5.5 * Note: This IC is not designed to be radiation-resistant. ●Electrical characteristics（Unless otherwise noted Ta=25°C, Vcc=3.6V, f=1kHz, RL=8Ω） Typ. BA7824FVM BA7826FVM 3.5 3.5 0 0 +11.5 +11.5 0 ― +6.0 +6.0 ― +5.1 0.07 0.2 -94 -94 -107 -107 1.8 1.8 VCC×0.8～VCC 2.0～VCC 0～0.5 0～0.5 Parameter Circuit current 1 Circuit current 2 Voltage gain 1 Voltage gain 2 Maximum output voltage1 Maximum output voltage2 Output distortion Output noise level Suspend attenuation Bias setting voltage Suspend hold voltage／H Suspend hold voltage／L *1：B.W.=0.4～30kHz *2：DIN AUDIO Symbol ICC1 ICC2 GV1 GV2 VOM1 VOM2 DSTN VNO GS VBIAS VSH1 VSH2 Unit mA μA dB dB dBV dBV ％ dBV dBV V V V Conditions No signal Active mode No signal Suspend mode VIN=-20dBV,1st Opamp gain 2nd Opamp gain DSTN=1％ BTL *1 VCC=3.4V,DSTN=1%,BTL *1 VIN=-20dBV SE *1 No signal, SE Active mode *2 VIN=-20dBV BTL *2 3pin DC voltage Active mode, Hold voltage Suspend mode, Hold voltage 2/8 ●Measurement circuit 1 A/S 2 3 4 600 22k 100k BIAS 8 7 6 5 8 V 0.1μ 1.0μ 0.1μ V 0.1μ 100μ Fig.2 BH7824FVM 100k VIN2 0.1μ 22k 1 600 2 A/S 3 BIAS 8 7 6 5 100k 8 100μ V 0.1μ VCC VIN1 0.1μ 1μ 22k 4 V 600 Fig.3 BH7826FVM ●Block diagram SUSPEND CTRL 1 A/S 8 SP OUT 2 BIAS OUT 2 7 GND BIAS IN 3 BIAS 6 VCC SP IN 4 5 SP OUT 1 Fig.4 BH7824FVM SP IN 2 1 8 SP OUT 2 7 GND BIAS SUSPEND CTRL 2 A/S BIAS 3 6 VCC 5 SP OUT 1 SP IN 1 4 Fig.5 BH7826FVM 3/8 ●Equivalent circuit Pin No. BH7824FVM Pin name Equivalent circuit Pin name BH7826FVM Equivalent circuit 1 SUSPEND CTRL 01 50k 50k 1k SUSPEND CTRL 01 100k 2 30k 487k BIAS OUT 30k 02 BIAS OUT 02 100k 3 30k 57k BIAS IN 30k 03 30k 150k BIAS IN 30k 03 4 1k SP IN 04 1k SP IN 04 5 SP OUT1 05 SP OUT1 05 6 VCC － VCC － 7 GND － GND － 8 SP OUT2 08 SP OUT2 08 Note: Numerical values in figures are design values, and do not guarantee ratings. 4/8 ●Application circuit BH7824FVM Co SUSPEND 01 A/S 02 03 04 R1 R2 BIAS 08 07 SPEAKER 06 05 SP_IN(L+R) Co Cf Fig.6 BH7826FVM Cf R2 SP_IN 0.1μ R1 01 SUSPEN 1μ 03 SP_IN BIAS 08 07 1μ 06 05 SPEAKER 02 0.1μ 04 R1 R2 Cf Fig.7 5/8 ●Cautions on use 1) Set within the ranges below. Item R1 R2 Cf Co fcutoff 8, 12Ωspeaker BH7824FVM/26FVM 10kΩ ≦ R1 ≦120kΩ 47kΩ ≦ R1 ≦120kΩ Cf≦560pF (G＞+6dB) Cf≦270pF(0＜G≦+6dB) Co ≦ 100pF fcutoff ≦ 4kHz fcutoff ＝ 1/(2πR2Cf ) [Hz] 16Ωspeaker BH7824FVM ← ← ← Co ≦ 47pF ← 2) 3) Do not use this IC without a load. 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 configuration, if a large capacitive load were connected, the amplifier might oscillate. This IC is compatible with dynamic speaker loads (8/12/16Ω: BH7824FVM, 8/12Ω: BH7826FVM) and is not compatible with loads other than these mentioned. A soft mute setting becomes effective on connecting a resistor and capacitor to the SUSPEND pin (1pin: BH7824FVM, 2pin: BH7826FVM). 4) 5) VCC R C 1 Recommend R：100kΩ C：0.47μF Fig.8 BH7824FVM Soft mute 6/8 ●Reference data 14 CIRCUIT CURRENT : ICCA[mA] 4.5 CIRCUIT CURRENT : ICCS[uA] 4 13 12 10 8 6 4 2 0 2.4 2.8 3.2 3.6 4 4.4 4.8 5.2 5.6 SUPPLY VOLTAGE : VCC[V] 3 2.5 2 1.5 1 0.5 0 2.4 2.8 3.2 3.6 4 4.4 4.8 5.2 5.6 SUPPLY VOLTAGE : VCC[V] VOLTAGE GAIN : Gv[dB] 3.5 12 11 10 9 8 2.4 2.8 3.2 3.6 4 4.4 4.8 5.2 5.6 SUPPLY VOLTAGE : VCC[V] Fig.9 Circuit current (ACTIVE) vs Supply voltage TOTAL HARMONIC DISTORTION : THD[%] 1 Fig.10 Circuit current (SUSPEND) vs Supply voltage Fig.11 Voltage gain vs Supply voltage 0.1 0.01 0 2 4 6 8 SUPPLY VOLTAGE : VCC[V] Fig.12 Total harmonic distortion vs Supply voltage ●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 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. 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 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. 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. 7/8 ●Selection of order type B H 7 8 2 Part No. BH7824FVM BH7826FVM 4 F V M T R Tape and Reel information MSOP8 Tape Quantity 2.9 ± 0.1 Embossed carrier tape 3000pcs 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) 0.29 ± 0.15 0.6 ± 0.2 4.0 ± 0.2 8 5 2.8 ± 0.1 Direction of feed 1 4 0.475 0.145 +0.05 −0.03 0.22 +0.05 −0.04 0.9Max. 0.75 ± 0.05 0.08 ± 0.05 0.08 M 0.65 0.08 S XX X X XXX XX X X XXX XX X X XXX XX X X XXX XX X X XXX 1Pin Reel Direction of feed ※Orders are available in complete units only. (Unit:mm) 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 Catalog No.05T341Be '05.10 ROHM C 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. 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 www.rohm.com Copyright © 2008 ROHM CO.,LTD. THE AMERICAS / EUROPE / ASIA / JAPAN Contact us : webmaster@ rohm.co. jp 21 Saiin Mizosaki-cho, Ukyo-ku, Kyoto 615-8585, Japan TEL : +81-75-311-2121 FAX : +81-75-315-0172 Appendix1-Rev2.0