Headphone Amplifiers Standard Headphone Amplifiers BH3544F,BH3547F,BH3548F No.15102EDT02 ●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 16/32Ω load, BH3548F can drive 8/16/32Ω. So, BH3548F is suitable for 8Ω 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. Supply voltage BH3544F BH3547F BH3548F +2.8 ～ +6.5 +4.5 ～ +6.5 +4.0 ～ +5.5 V 7.0 3.7 6.5 mA Quiescent current Amplifier gain 6 Output [RL=16Ω] 62 dB 62 mW 16 / 32 77 8/16/32 Ω -25 ～ +75 -40 ～ +85 ℃ load impedance Operating temperature range Unit ●Absolute maximum ratings(Ta=25°C) Parameter Applied voltage Power dissipation Storage temperature *1 Ratings Symbol Unit BH3544F,BH3547F,BH3548F VCC 7.0 Pd 550 Tstg V *1 mW -55～+125 °C Derating is done at 5.5mW/°C above Ta=25°C. (When mounted on a 70mm×70mm×1.6mm PCB board, FR4) ●Operating conditions (Ta=25°C) Parameter Symbol Supply voltage VCC Temperature Range Topr Limits Unit 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 © 2015 ROHM Co., Ltd. All rights reserved. 1/8 2015.06 - Rev.D Technical Note BH3544F,BH3547F,BH3548F ●Electrical characteristics (Unless otherwise noted, Ta=25°C,VCC=5V,RL=32Ω,f=1kHz,BW=400～30kHz, VIN =-6dBV) Limits(TYP.) Parameter Symbol Unit Conditions 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 6 dB - Gain difference between channels ΔGVC 0 dB - Total harmonic distortion THD 0.02 0.05 0.02 % 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 Input resistance -93 -90 -87 dBV -90 BW=20～20kHz RL=32Ω,THD<0.1% (BH3541F,BH3544F,BH3548F) RL=32Ω,THD＜0.3% (BH3547F) RL=16Ω,THD<0.1% (BH3541F,BH3544F,BH3548F) RL=16Ω,THD＜0.5% (BH3547F) RL=8Ω,THD＜0.25% (BH3548F) BW=20～20kHz,Rg=0Ω dB Rg=0Ω -80 dB Rg=0Ω RR -57 dB fRR=100Hz,VRR=-20dBV Rin 90 kΩ - ●Reference data BH3544F Fig. 1 Quiescent current vs. power supply voltage www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. BH3544F Fig. 2 in DC current vs. power supply voltage 2/8 BH3544F Fig. 3 Output voltage vs. Mute control voltage 2015.06 - Rev.D Technical Note BH3544F,BH3547F,BH3548F ●Reference data (Continued) Fig. 4 Voltage gain vs. frequency BH3544F Fig. 7 Total harmonic distortion vs. output voltage (3) 10 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) BH3544F Fig. 8 Total harmonic distortion vs. output voltage (4) BH3544F Fig. 10 MUTE attenuation vs. frequency Fig. 11 Ripple rejection vs. frequency www.rohm.com 10 OUTPUT VOLTAGE :VO (dBV) BH3544F © 2015 ROHM Co., Ltd. All rights reserved. TOTAL DISTORTION : THD (%) (%) TOTALHARMONIC HARMONIC DISTORTION : THD BH3544F TOTAL HARMONIC DISTORTION : THD (%) TOTAL HARMONIC DISTORTION : THD (%) BH3544F 3/8 BH3544F Fig. 9 Channel separation vs. frequency BH3544F Fig. 12 Ripple rejection vs. power supply voltage 2015.06 - Rev.D Technical Note BH3544F,BH3547F,BH3548F ●Block diagram VCC OUT2 BIAS IN2 8 7 6 5 BIAS 90k 6dB TSD 90k 6dB MUTE 1 2 3 4 OUT1 MUTE IN1 GND Fig. 13 ●Measurement circuit SW7 1 32 16 330μ 2 V V7AC SW5 R5 1μ 1 47μ CVCC 2 SW8B 10μ A IQ 1 2 VCC BIAS OUT2 8 7 IN2 6 VIN2 5 BIAS SWBA 90k VRR + 6dB TSD 90k VCC + 6dB MUTE 32 16 SW1 1 2 1 330μ V1AC V 2 OUT1 3 MUTE VTM 4 IN1 R3 GND SW3 1μ 1 2 VIN1 Fig. 14 www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. 4/8 2015.06 - Rev.D Technical Note BH3544F,BH3547F,BH3548F ●Terminal Equivalent Circuit / Description Pin No. Pin Name I /O Equivalent circuit Pin voltage BH3544F, BH3548F VCC 1 OUT1 7 OUT2 O 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 5 IN2 I 2.1V (VCC=5V) 3 3 5 I/O 2.1V (VCC=5V) 90k BIAS 60k 6 Bias pin VCC VCC BIAS Input pin 5 90k BIAS 6 Mute control pin Active:Hi Mute:Lo (open) 2 190k 3 Function BH3547F BIAS 70k 6 BIAS 64k 60k (Since the 47 µF 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 © 2015 ROHM Co., Ltd. All rights reserved. 5/8 2015.06 - Rev.D Technical Note BH3544F,BH3547F,BH3548F ●Application circuit C7 330 µ + VCC C8 10 µ VCC + + BIAS OUT2 8 C6 47µ 7 C5 1µ R5 VIN2 IN2 6 5 BIAS 90k 6dB TSD 90k 6dB MUTE C1 330µ + VMUTE H : Active L : Mute 1 2 OUT1 R2 100k 3 4 MUTE IN1 C2 1µ R3 GND C3 1µ VIN1 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 90kΩ, these are found by the expressions below, although drift, temperature characteristics, and other considerations are necessary. (Layered ceramic capacitors are recommended.) C3(C5)=1/(2π× 90kΩ×fc) 2) Bias capacitor (C6) When VCC=5V, 47μF 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 BH3544F,BH3548F have an impedance of 190kΩ against GND and the BH3547F has 200kΩ, 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/(2π×(RL+Rｘ)× 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. GVC=6+20log(90kΩ/(90kΩ+R3[R5])) [dB] When input gain is not accommodated, these resistors have no use. www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. 6/8 2015.06 - Rev.D Technical Note BH3544F,BH3547F,BH3548F ●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. 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)BH3544F/ BH3548F Rise time VCC A PLAY period B A Rise time 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.) (MUTE period) 2)BH3547F (Rise time) (PLAY period) (Fall period) (B) VCC (A) Vmute SG (I t 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 © 2015 ROHM Co., Ltd. All rights reserved. 7/8 2015.06 - Rev.D Technical Note BH3544F,BH3547F,BH3548F ●Ordering part number B H 3 Part No. 5 4 4 F - E Package F: SOP8 Part No. 3544 3547 3548 2 Packaging and forming specification E2: Embossed tape and reel SOP8 <Tape and Reel information> 7 6 5 6.2±0.3 4.4±0.2 0.3MIN 8 +6° 4° −4° 1 2 3 0.9±0.15 5.0±0.2 (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 1.5±0.1 +0.1 0.17 -0.05 S S 0.11 0.1 1.27 1pin 0.42±0.1 Reel (Unit : mm) www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. 8/8 Direction of feed ∗ Order quantity needs to be multiple of the minimum quantity. 2015.06 - Rev.D Datasheet Notice Precaution on using ROHM Products 1. Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment, OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you (Note 1) , transport intend to use our Products in devices requiring extremely high reliability (such as medical equipment equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or serious damage to property (“Specific Applications”), please consult with the ROHM sales representative in advance. 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The Products are not subject to radiation-proof design. 5. Please verify and confirm characteristics of the final or mounted products in using the Products. 6. In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse. is applied, confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect product performance and reliability. 7. De-rate Power Dissipation (Pd) depending on Ambient temperature (Ta). When used in sealed area, confirm the actual ambient temperature. 8. Confirm that operation temperature is within the specified range described in the product specification. 9. ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in this document. Precaution for Mounting / Circuit board design 1. When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product performance and reliability. 2. In principle, the reflow soldering method must be used on a surface-mount products, the flow soldering method must be used on a through hole mount products. If the flow soldering method is preferred on a surface-mount products, please consult with the ROHM representative in advance. For details, please refer to ROHM Mounting specification Notice-PGA-E © 2015 ROHM Co., Ltd. All rights reserved. Rev.001 Datasheet Precautions Regarding Application Examples and External Circuits 1. If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the characteristics of the Products and external components, including transient characteristics, as well as static characteristics. 2. 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ROHM shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny ROHM’s Products against warning, caution or note contained in this document. 2. All information contained in this docume nt is current as of the issuing date and subj ect to change without any prior notice. Before purchasing or using ROHM’s Products, please confirm the la test information with a ROHM sale s representative. 3. The information contained in this doc ument is provi ded on an “as is” basis and ROHM does not warrant that all information contained in this document is accurate an d/or error-free. ROHM shall not be in an y way responsible or liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or concerning such information. Notice – WE © 2015 ROHM Co., Ltd. All rights reserved. Rev.001