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| Headphone Amplifiers Standard Headphone Amplifiers BH3541F,BH3544F,BH3547F,BH3548F No.10102EAT02 Description BH3541F, BH3544F, BH3547F, BH3548F is headphone amplifiers suitable for portable products. BH3541F has a fixed gain of 0 dB and BH3544F, BH3547F, BH3548F has a fixed gain of 6 dB. External resistors for gain setting are not needed. Package of BH3541F, BH3544F, BH3547F, BH3548F is pin-to-pin compatible (SOP8), enable to replace each other easily. BH3541F, 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. BH3541F, 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) BH3541F, 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. Supply voltage Quiescent current Amplifier gain Output [RL=16] load impedance Operating temperature range Absolute maximum ratings(Ta=25C) Parameter Applied voltage Power dissipation Storage temperature *1 BH3541F BH3544F BH3547F +4.5 +5.5 3.7 6 77 BH3548F +4.0 +5.5 6.5 62 8/16/32 -40 +85 Unit V mA dB mW +2.8 +6.5 7.0 0 62 16 / 32 -25 +75 Symbol VCC Pd Tstg Ratings BH3541F,BH3544F,BH3547F,BH3548F 7.0 550 *1 -55+125 Unit V mW C Derating is done at 5.5mW/C above Ta=25C. (When mounted on a 70mmx70mmx1.6mm PCB board, FR4) Operating conditions (Ta=25C) Parameter Supply voltage Temperature Range Symbol VCC Topr Limits BH3541F,BH3544F +2.8 +6.5 -25+75 BH3547F +4.5 +6.5 BH3548F +4.0 +5.5 -40 +85 Unit V * These product are not designed for protection against radioactive rays. www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 1/8 2010.05 - Rev.A BH3541F,BH3544F,BH3547F,BH3548F Technical Note Electrical characteristics (Unless otherwise noted, Ta=25C,VCC=5V,RL=32,f=1kHz,BW=40030kHz BH3541F : VIN=0dBV, BH3544F, BH3547F, BH3548F : VIN =-6dBV) Limits(TYP.) Parameter Symbol Unit Conditions BH3541F BH3544F BH3547F BH3548F Quiescent current Mute pin control voltage H Mute pin control voltage L Gain Gain difference between channels Total harmonic distortion IQ VTMH VTML GVC GVC THD 0.02 0 0 0.05 0.02 7 1.6< <0.3 6 3.7 6.5 mA V V dB dB % BW=2020kHz RL=32,THD<0.1% (BH3541F,BH3544F,BH3548F) RL=32,THD0.3% (BH3547F) RL=16,THD<0.1% (BH3541F,BH3544F,BH3548F) RL=16,THD0.5% (BH3547F) RL=8,THD0.25% (BH3548F) BW=2020kHz,Rg=0 Rg=0 Rg=0 fRR=100Hz,VRR=-20dBV VIN=0Vrms Mute OFF Mute ON - Rated output 1 PO1 31 46 31 mW Rated output 2 PO2 62 77 62 mW Rated output 3 Output noise voltage Channel separation Mute attenuation Ripple rejection Input resistance PO3 VNO CS ATT RR Rin 180 -90 -93 -87 -80 -57 90 120 mW dBV -90 dB dB dB k Reference data BH3541F/BH3544F BH3541F/BH3544F BH3541F/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 (c) 2010 ROHM Co., Ltd. All rights reserved. 2/8 2010.05 - Rev.A BH3541F,BH3544F,BH3547F,BH3548F Reference data (Continued) BH3541F/BH3544F TOTAL HARMONIC DISTORTION : THD TOTAL HARMONIC DISTORTION : THD (%) (%) Technical Note BH3541F/BH3544F 10 TOTAL HARMONIC DISTORTION : THD (%) (%) TOTAL HARMONIC DISTORTION : THD BH3541F/BH3544F 10 Ta25C RL32 VCC3V f10kHZ Ta25C RL32 VCC5V 1 f10kHZ 1 0.1 f1kHZ 0.1 f1kHZ 0.01 f100HZ 0.001 40 0.01 f100HZ 30 20 10 0 10 0.001 40 30 20 10 0 10 OUTPUT VOLTAGE : (dBV) VO OUTPUT VOLTAGE VO (dBV) : Fig. 4 Voltage gain vs. frequency Fig. 5 Total harmonic distortion vs. output voltage (1) Fig. 6 Total harmonic distortion vs. output voltage (2) BH3541F/BH3544F BH3541F/BH3544F BH3541F/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 BH3541F/BH3544F BH3541F/BH3544F BH3541F/BH3544F Fig. 10 MUTE attenuation vs. frequency Fig. 11 Ripple rejection vs. frequency Fig. 12 Ripple rejection vs. power supply voltage www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 3/8 2010.05 - Rev.A BH3541F,BH3544F,BH3547F,BH3548F Block diagram V CC 8 O UT2 7 BIA S 6 IN2 5 Technical Note B IAS 0d B (6d B) TS D 180 k (90 k) 180 k (9 0k) 0 dB (6d B) MUTE 1 OU T1 2 MUTE 3 I N1 4 G ND ( ) are BH3544F, BH3547F, BH3548F values. Fig. 13 Measurement circuit 32 SW7 1 330 16 2 V V7AC R5 CVCC 47 2 VCC 8 OUT2 7 BIAS 6 IN2 5 1 1 SW5 SW8B A IQ 10 VIN2 1 2 SWBA 0dB (6dB) BIAS 180k (90k) VRR TSD VCC + 0dB (6dB) 180k (90k) MUTE 32 SW1 1 1 330 OUT1 VTM 2 MUTE + 3 IN1 4 GND SW3 1 1 2 VIN1 16 2 V1AC V R3 ( ) are BH3544F, BH3547F, BH3548F values. Fig. 14 www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 4/8 2010.05 - Rev.A BH3541F,BH3544F,BH3547F,BH3548F Terminal Equivalent Circuit / Description Pin No. Pin Name Equivalent circuit BH3544F,BH3547F,BH3548F BH3547F Technical Note I /O Pin voltage Function VCC VCC 1 7 OUT1 O OUT2 2.1V (VCC=5V) 1 7 10k 1 7 10k Output pin VCC VCC 2 MUTE I 0.1V (When open) 2 190k 2 200k Mute control pin Mute on:Hi Mute off:Lo (open) VCC VCC 3 5 IN1 I IN2 2.1V (VCC=5V) 3 5 BIAS 180k 3 5 BIAS 90k Input pin VCC VCC Bias pin (Since the 47 F externally attached capacitor also serves as the time constant for pop noise countermeasures, evaluate adequately when changing it.) 6 BIAS I/O 2.1V (VCC=5V) 60k 70k 6 60k BIAS 6 64k BIAS 4 GND I - - - GND pin 8 VCC I - - - Power supply pin The figure in the pin explanation and input/output equivalent circuit is reference value, it doesn't guarantee the value. www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 5/8 2010.05 - Rev.A BH3541F,BH3544F,BH3547F,BH3548F Application circuit C7 330 + VCC C8 10 + VCC 8 OUT2 7 + BIAS 6 C6 47 IN2 5 R5 C5 1 Technical Note VIN2 BIAS 0dB (6dB) TSD 0dB (6dB) MUTE C1 330 + VMUTE H : Active L : Mute R2 100k 180k (90k) 180k (90k) 1 OUT1 2 MUTE 3 IN1 4 GND C3 1 VIN 1 R3 C2 1 ( ) are BH3544F, BH3547F, BH3548F values. 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 of the BH3541F is 180k and that of the BH3544F,BH3547F,BH3548F 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/(2x180kxfc) [BH3541F] C3(C5)=1/(2x 90kxfc) [BH3544,BH3547F,BH3548F] 2) Bias capacitor (C6) When VCC=5V, 47F is recommended. Since lowering the capacitance too much can cause worsening of electrical characteristics or the occurrence of pop noise, when changing this, determine it after checking this adequately. 3) Mute pin pop noise countermeasures (R2, C2) Since the BH3541F,BH3544F,BH3548F has 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 RL is the output load resistance (assuming a resistance RX is put in for output protection or current restriction), these are found by the expression below. C1(C7)=1/(2x(RL+R)x fc) 5) Input gain adjustment resistances (R3, R5) (BH3544F,BH3547F) Externally attached resistances (R3, R5) make input gain adjustment possible. The gain found by the expression below can be set. GVC=6+20log(90k/(90k+R3[R5])) [dB] When input gain is not accommodated, these resistors have no use. Notes for use 1) Numbers and data in entries are representative design values and are not guaranteed values of the items. 2) Although we are confident in recommending the sample application circuits, carefully check their characteristics further when using them. When modifying externally attached component constants before use, determine 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 temperature range, or other absolute maximum ratings are exceeded, the LSI may be damaged. Do not apply voltages or temperatures 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 absolute maximum ratings are exceeded to the LSI. www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 6/8 2010.05 - Rev.A BH3541F,BH3544F,BH3547F,BH3548F Technical Note 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 voltage 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 adequate attention to orientation and placement discrepancies of the LSI. If it is misinstalled and the power is turned on, the LSI may be damaged. It also may be damaged 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 field, 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)BH3541F/ BH3544F/ BH3548F Rise time A PLAY period Rise time A VCC B C OUT MUTE 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 because it is used by the externally attached C2 and R2 as a pop noise countermeasure on mute cancellation, so be careful of the timing.) (C):Mute start time (As on cancellation, this has a time constant.) 2)BH3547F (Rise time) (MUTE period) (PLAY period) (Fall period) VCC (B) (A) Vmute SG (Input Signal) OUT 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) www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 7/8 2010.05 - Rev.A BH3541F,BH3544F,BH3547F,BH3548F Ordering part number Technical Note B H 3 Part No. 3541 3544 3547 3548 5 4 1 F Package F: SOP8 - E 2 Part No. Packaging and forming specification E2: Embossed tape and reel SOP8 5.00.2 (MAX 5.35 include BURR) 8 7 6 5 +6 4 -4 0.90.15 0.3MIN Tape Quantity Direction of feed Embossed carrier tape 2500pcs E2 The direction is the 1pin of product is at the upper left when you hold 6.20.3 4.40.2 ( reel on the left hand and you pull out the tape on the right hand ) 12 3 4 0.595 1.50.1 +0.1 0.17 -0.05 S 0.1 0.11 S 1.27 0.420.1 1pin Direction of feed (Unit : mm) Reel Order quantity needs to be multiple of the minimum quantity. www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 8/8 2010.05 - Rev.A Notice Notes No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified 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 specifications, 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 specified 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 specified herein is intended only to show the typical functions of and examples of application circuits for the Products. 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 specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices). The Products specified 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, fire or any other damage caused in the event of the failure of any Product, such as derating, redundancy, fire 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, fuelcontroller 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 specified 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. Thank you for your accessing to ROHM product informations. More detail product informations and catalogs are available, please contact us. ROHM Customer Support System http://www.rohm.com/contact/ www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. R1010A |
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