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. BH3541F Supply voltage Quiescent current Amplifier gain BH3544F BH3547F BH3548F Unit +2.8 +6.5 +4.5 +5.5 +4.0 +5.5 V 7.0 3.7 6.5 mA 0 Output [RL=16] 6 62 dB 77 load impedance Operating temperature range 62 mW 16 / 32 8/16/32 -25 +75 -40 +85 Absolute maximum ratings(Ta=25C) Parameter Applied voltage Power dissipation Storage temperature *1 Ratings Symbol Unit BH3541F,BH3544F,BH3547F,BH3548F VCC 7.0 V Pd 550 *1 mW Tstg -55+125 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 Symbol Supply voltage VCC Temperature Range Topr Limits Unit BH3541F,BH3544F BH3547F BH3548F +2.8 +6.5 +4.5 +6.5 +4.0 +5.5 V -40 +85 -25+75 * 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 Technical Note BH3541F,BH3544F,BH3547F,BH3548F 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 IQ 7 3.7 6.5 mA VIN=0Vrms Mute pin control voltage H VTMH 1.6< V Mute OFF Mute pin control voltage L VTML <0.3 V Mute ON Gain GVC Gain difference between channels GVC Total harmonic distortion THD 0 6 0 0.02 0.05 0.02 dB - dB - % Rated output 1 PO1 31 46 31 mW Rated output 2 PO2 62 77 62 mW Rated output 3 PO3 120 mW Output noise voltage VNO Channel separation CS Mute attenuation ATT Ripple rejection RR Input resistance Rin -93 -90 180 dBV -87 -90 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 dB Rg=0 -80 dB Rg=0 -57 dB fRR=100Hz,VRR=-20dBV 90 k - Reference data BH3541F/BH3544F Fig. 1 Quiescent current vs. power supply voltage www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. BH3541F/BH3544F Fig. 2 in DC current vs. power supply voltage 2/8 BH3541F/BH3544F Fig. 3 Output voltage vs. Mute control voltage 2010.05 - Rev.A Technical Note BH3541F,BH3544F,BH3547F,BH3548F Reference data (Continued) Fig. 4 Voltage gain vs. frequency BH3541F/BH3544F Fig. 7 Total harmonic distortion vs. output voltage (3) 10 BH3541F/BH3544F Ta25C RL32 VCC5V 1 f10kHZ 0.1 f1kHZ 0.01 f100HZ 0.001 40 30 20 10 0 10 Ta25C RL32 VCC3V 1 f10kHZ 0.1 f1kHZ 0.01 0.001 40 f100HZ 30 20 10 0 10 OUTPUT VOLTAGE: VO (dBV) Fig. 5 Total harmonic distortion vs. output voltage (1) Fig. 6 Total harmonic distortion vs. output voltage (2) BH3541F/BH3544F Fig. 8 Total harmonic distortion vs. output voltage (4) BH3541F/BH3544F Fig. 10 MUTE attenuation vs. frequency Fig. 11 Ripple rejection vs. frequency www.rohm.com 10 OUTPUT VOLTAGE :VO (dBV) BH3541F/BH3544F (c) 2010 ROHM Co., Ltd. All rights reserved. TOTAL DISTORTION : THD (%) (%) TOTALHARMONIC HARMONIC DISTORTION : THD BH3541F/BH3544F TOTAL HARMONIC DISTORTION : THD (%) TOTAL HARMONIC DISTORTION : THD (%) BH3541F/BH3544F 3/8 BH3541F/BH3544F Fig. 9 Channel separation vs. frequency BH3541F/BH3544F Fig. 12 Ripple rejection vs. power supply voltage 2010.05 - Rev.A Technical Note BH3541F,BH3544F,BH3547F,BH3548F Block diagram V CC O UT2 BIA S IN2 8 7 6 5 B IAS 180 k (90 k) 0d B (6d B) 180 k (9 0k) TS D 0 dB (6d B) MUTE 1 2 3 4 OU T1 MUTE I N1 G ND ( ) are BH3544F, BH3547F, BH3548F values. Fig. 13 Measurement circuit SW7 1 32 16 330 2 V V7AC SW5 R5 1 1 47 CVCC 2 SW8B 10 A IQ 1 2 OUT2 VCC 8 BIAS 7 IN2 6 VIN2 5 BIAS SWBA 180k (90k) 0dB (6dB) + VRR 180k (90k) TSD VCC + 0dB (6dB) MUTE 32 16 SW1 1 2 1 330 V1AC V 2 OUT1 3 MUTE VTM 4 IN1 R3 GND SW3 1 1 2 VIN1 ( ) are BH3544F, BH3547F, BH3548F values. Fig. 14 www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 4/8 2010.05 - Rev.A Technical Note BH3541F,BH3544F,BH3547F,BH3548F Terminal Equivalent Circuit / Description Pin No. Pin Name I /O Pin voltage Equivalent circuit BH3544F,BH3547F,BH3548F VCC 1 OUT1 O 7 OUT2 2.1V (VCC=5V) VCC 1 Output pin 1 7 7 10k 10k VCC VCC 2 MUTE I 0.1V (When open) 2 200k VCC VCC IN1 I 5 IN2 2.1V (VCC=5V) 3 3 5 I/O 2.1V (VCC=5V) 90k BIAS 70k 60k 6 Bias pin VCC VCC BIAS Input pin 5 180k BIAS 6 Mute control pin Mute on:Hi Mute off:Lo (open) 2 190k 3 Function BH3547F BIAS 6 BIAS 64k 60k (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 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 Technical Note BH3541F,BH3544F,BH3547F,BH3548F Application circuit C7 330 + VCC C8 10 VCC + + BIAS OUT2 8 C6 47 7 R5 C5 1 VIN2 IN2 6 5 BIAS 180k (90k) 0dB (6dB) 180k (90k) TSD 0dB (6dB) MUTE C1 330 + 1 2 OUT1 VMUTE H : Active L : Mute R2 100k 3 4 MUTE IN1 C2 1 R3 GND C3 1 VIN 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 Technical Note BH3541F,BH3544F,BH3547F,BH3548F 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 VCC Rise time PLAY period B A 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 (MUTE period) (Rise time) (PLAY period) (Fall period) (B) VCC (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 Technical Note BH3541F,BH3544F,BH3547F,BH3548F Ordering part number B H 3 Part No. 5 4 1 F Part No. 3541 3544 3547 3548 - E Package F: SOP8 2 Packaging and forming specification E2: Embossed tape and reel SOP8 <Tape and Reel information> 7 6 5 6.20.3 4.40.2 0.3MIN 8 +6 4 -4 1 2 3 0.90.15 5.00.2 (MAX 5.35 include BURR) Tape Embossed carrier tape Quantity 2500pcs Direction of feed E2 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 ) 4 0.595 1.50.1 +0.1 0.17 -0.05 S S 0.11 0.1 1.27 1pin 0.420.1 Reel (Unit : mm) www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 8/8 Direction of feed Order quantity needs to be multiple of the minimum quantity. 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. 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