Audio Accessory ICs Preamps with Built-in ALC BA3308F,BA3308FV No.11087ECT01 ●Description The BA3308F/FV is a dual preamplifier for recording and playback with ALC (auto level control), developed for stereo radio, cassette recorders, tape recorders, and other pre amplifiers audio applications. ALC circuit has a build in rectification circuit with wide adjustable dynamic range, high gain, low distortion amplifiers with direct coupling and mute circuit, used to cut off pop noise during power on. Available in SOP14, or SSOP-B14 Packages. ●Features 1) Built-in ALC rectification diode 2) Wide operating power supply voltage range (VCC=4.5~14 V) 3) Low current consumption (IQ=3.5mA) 4) High gain (GVO=80dB) 5) Low distortion (THD=0.1%) 6) Low noise (VNIN=1 μVrms) 7) Input coupling capacitor not needed 8) Good ALC channel balance 9) Built-in power supply mute circuit 10) Dynamic range of ALC can be changed by attaching input resistance. ●Applications Stereo radio, cassette tape recorders, stereo cassette decks, home stereos, music centers, etc. ●Line up matrix Part No. Package BA3308F BA3308FV SOP14 SSOP-B14 www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 1/9 2012.06 - Rev.C Technical Note BA3308F,BA3308FV ●Absolute maximum ratings(Ta=25℃) Parameter Symbol Supply voltage VCC BA3308F Power dissipation BA3308FV Operating temperature Storage temperature Limits Unit 16 V 450*1 350*2 －25～＋75 －55～＋125 Pd Topr Tstg mW ℃ ℃ *1 Reduce by 4.5 mW/C over 25C, when mounted on a 70mm×70mm×1.6mm PCB board. 2 * Reduce by 3.5 mW/C over 25C ●Operating conditions(Ta=25℃) Parameter Symbol Min. Typ. Max. Unit VCC 4.5 - 14 V Supply voltage Note: This IC is not designed to be radiation-resistant. ●Electrical characteristics(Unless otherwise noted, Ta=25℃, Vcc=7.0V, f=1kHz, BPF20～20kHz) Parameter Test Circuit Fig.17 Symbol Min. Typ. Max. Unit IQ 1.5 3.5 4.5 mA VIN=0Vrms Open loop voltage gain GVO 70 80 - dB VOUT=-10dBV Fig.17 Total harmonic distortion THD - 0.1 0.3 % NAB34dB, VOUT=40mVrms Fig.17 Input resistance RIN 15 25 45 kΩ Maximum output voltage Input conversion noise voltage VOM 0.6 1.2 - Vrms VNIN - 1 2 μVrms ALC 40 45 - dB ΔALC - 0 2.5 dB VIN=-60dBV,-30dBV Fig.17 CS 60 75 - dB VO=0dBV, NAB 34dB Fig.17 Quiescent current ALC range ALC channel balance Channel separation www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 2/9 Conditions Fig.17 THD=1% Rg=2.2kΩ, referenced to NAB 34dB at 1kHz Rg=3.9 kΩ, VIN＝-70 dBV standard, THD=3% Fig.17 Fig.17 Fig.17 2012.06 - Rev.C Technical Note BA3308F,BA3308FV ●Block diagram BA3308F/FV 14 N.C. OUTPUT1 1 GND 2 N.C. 3 ALC V CC N.C. OUTPUT2 ALC 4 5 13 INPUT1 12 N.C. 11 NF1 V cc 6 7 10 NF2 9 INPUT2 8 N.C. Fig.1 www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 3/9 2012.06 - Rev.C Technical Note BA3308F,BA3308FV ●Electrical characteristic curves (Reference data) Fig.2 Quiescent current vs. power supply voltage Fig.5 Total harmonic distortion vs. frequency Fig.8 Input conversion noise voltage vs. signal source resistance Fig.11 Input/output characteristics www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. Fig.3 Quiescent current vs. ambient temperature Fig.6 Voltage gain vs. supply voltage Fig.4 Voltage gain vs. frequency Fig.7 Closed loop voltage gain vs. ambient temperature Fig.9 Channel separation vs. frequency Fig.10 ALC characteristics Fig.12 Maximum output voltage vs. power supply voltage Fig.13 Maximum output voltage vs. load resistance 4/9 2012.06 - Rev.C Technical Note BA3308F,BA3308FV ●Description of operations 1. Recording 1) Record amplifier BA3308 ch2 (ch1) Cont The BA3308F/FV amplifier of ch1 and ch2 input stage (13pin, 9pin) can be direct coupled or use coupling capacitors (C1/C2). The voltage gain of the record amplifier is determined by GV=R5/R3. The R5/R6, and C3/R3 regulate control of the pop noise that occurs at power-on (see “Cautions on use”) and direct current bias fed back is set by R5/R6 and C5/C6 at the output stage. ch2 (ch1) ch1 (ch2) 2 (8) 13(9) R1 (R2) 3.9k C1 (C2) 10F 1 (9) 11(10) 45 31 (7) R5 (R6) 18k R3 (R4) 39 R7 (R8) 1M C7 (C8) 22F C5 (C6) 10F C3 (C4) 100F INPUT OUTPUT Fig.14 Fig.5 2) ALC The BA3308F/FV has an on-chip signal rectifier and electronic volume needed for ALC. The signal rectifier compares the direct current output voltage that is superposed in the output stage (1, 7pin) signal to the reference voltage 4.5VF (≒3V; 1VF is approximately 0.7V) in the comparator circuit and if the output voltage is higher, it turns the comparator ON to charge the smoothing capacitor C7. Since the operation point of the output stage of amplifier ch1 and ch2 is fixed at 3VF, the comparator turns ON when the peak value of the signal output voltage is 1.5VF (effective value approx. 0.75V). Once the direct current signal for electronic volume is controlled, ALC operation starts. The electronic volume, which is connected between the input line (13, 9pin) and GND, causes the input signal to attenuate according to the ratio of the external resistance (R1, R2) to the resistance value of the electronic volume. The ALC range varies according to the values of R1 and R2. For small ALC variation the S/N will determinate an adequate ALC range is obtained by applying several kΩ of the R1 and R2. The attack time and recovery time of ALC are set according to C7 and R7 of 4pin. If the time constants (C7, R7) are large, the recovery time will be long and as C7 becomes smaller, and the attack time will be shorter. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 5/9 ch1 (ch2) ch2 (ch1) Comp ch2 (ch1) Cont 4.5VF BA3308 VOUT (DCAC) 1 (7) 4 3 (7) 13(9) 5 2 (8) 3VF R7 C7 Fig.15 Fig.6 2012.06 - Rev.C R1 (R2) Technical Note BA3308F,BA3308FV 2. On playback Since amplifier ch1 and ch2 are used as a NAB equalizer . amplifier at playback, a time constant circuit is established in the NF section (1-11pin, 7-10pin) to obtain NAB characteristics. The voltage gain at this time is determined by the following formula: GV = │R11＋R9/ (│＋jωC9・R9)│/R3 Obtain the necessary gain by regulating the (power-on pop noise prevention) NAB time constant circuit in the same way when regulating the gain at recording stage. The operating point of the output stage (1,7pin) is fixed at 3VF. Accordingly, even if VCC is raised to 5V or more, as in the VMAX-VCC characteristic (Fig.13), the maximum output voltage does not rise above 1.2V (Typ.). 4pin is grounded at playback since ALC is not needed. For better signal-to-noise ratio characteristics at playback, don’t use R1 and R2, which are attached to the input pin (13pin, 9pin). www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 6/9 BA3308 A1 13(9) 2 (8) 11(10) 1 (9) R3 (R4) 39 C1 (C2) 10μF R11 (R12) 4.3k R9 (R10) 120k C9 0.027μF (C10) C3 (C4) 100μF 31 (7) (7) 45 C5 (C6) 10μF OUTPUT INPUT Fig.16 Fig.7 2012.06 - Rev.C Technical Note BA3308F,BA3308FV ●Measurement circuit V 100μF 10k 22k 2 OUTPUT1 1 120k 1.2k V SW6A 3 1 10μF SW2A V2 33k INPUT1 30k SW4A 2 V1 V 39Ω 0.1μF 1M SW5 VCC 14 2 13 3 22μF 220Ω 1 SW3A 3.9k SW3B 12 ALC 4 330μF 3.9k 11 5 10 6 9 7 8 0.1μF 1.2k 2 SW4B 30k 33k 1 120k 10μF 39Ω SW2B V2 V 10kΩ 3 1 OUTPUT2 SW6B V 100μF 2.2k INPUT2 2 V V1 SW1B Fig.17 Fig.17 ●Application circuit OUTPUT1 C5 C3 R3 10μF 100μF 39Ω R5 18kΩ 1 14 2 13 3 12 R1 R7 VCC=7 1MΩ R8 220Ω 22μF ALC 4 C7 3.9kΩ C5 INPUT1 10μF 11 330μF 5 C8 10 R2 6 9 7 8 3.9kΩ C2 INPUT2 10μF R6 18kΩ C6 R4 39Ω 10μF OUTPUT2 R11 (R12) 4.3kΩ C4 R9 (R10) 120kΩ 100μF For playback, connect the following NAB time constant circuit between C9 (C10) pins 11 and 1 and pins 10 and 7 in place of R5 and R6. 0.027μF Fig.18 www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 7/9 2012.06 - Rev.C Technical Note BA3308F,BA3308FV ●Notes for use 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 magnetic fields Using the ICs in a strong electromagnetic field can cause operation malfunction. 8) The BA3308F/FV has an on-chip power supply mute circuit that checks for pop noise at power-on. This prevents the occurrence of pop noise by timing the charge times of the direct current cut capacitors C3 and C4 of 10pin and 11pin, and of capacitor C8 for the ripple filter of 5pin. Accordingly, to obtain an adequate effect, it is recommended that the constants of the application circuit be used in C3, C4, R3, R4, C8, and R8. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 8/9 2012.06 - Rev.C Technical Note BA3308F,BA3308FV ●Ordering part number B A 3 Part No. 3 0 8 F Part No. - Package F: SOP14 FV: SSOP-B14 E 2 Packaging and forming specification E2: Embossed tape and reel SOP14 <Tape and Reel information> 8.7 ± 0.2 (MAX 9.05 include BURR) 8 Tape Embossed carrier tape Quantity 2500pcs E2 Direction of feed 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 0.3MIN 4.4±0.2 6.2±0.3 14 1 ) 7 1.5±0.1 0.15 ± 0.1 0.4 ± 0.1 0.11 1.27 0.1 1pin Direction of feed ∗ Order quantity needs to be multiple of the minimum quantity. Reel (Unit : mm) SSOP-B14 <Tape and Reel information> 5.0 ± 0.2 8 0.3Min. 4.4 ± 0.2 6.4 ± 0.3 14 1 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 ) 7 0.10 1.15 ± 0.1 0.15 ± 0.1 0.65 0.1 0.22 ± 0.1 1pin Reel (Unit : mm) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 9/9 Direction of feed ∗ Order quantity needs to be multiple of the minimum quantity. 2012.06 - Rev.C 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. Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of any ROHM’s Products for Specific Applications. (Note1) Medical Equipment Classification of the Specific Applications JAPAN USA EU CHINA CLASSⅢ CLASSⅡb CLASSⅢ CLASSⅢ CLASSⅣ CLASSⅢ 2. ROHM designs and manufactures its Products subject to strict quality control system. However, semiconductor products can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate safety measures including but not limited to fail-safe design against the physical injury, damage to any property, which a failure or malfunction of our Products may cause. The following are examples of safety measures: [a] Installation of protection circuits or other protective devices to improve system safety [b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure 3. Our Products are designed and manufactured for use under standard conditions and not under any special or extraordinary environments or conditions, as exemplified below. Accordingly, ROHM shall not be in any way responsible or liable for any damages, expenses or losses arising from the use of any ROHM’s Products under any special or extraordinary environments or conditions. If you intend to use our Products under any special or extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of product performance, reliability, etc, prior to use, must be necessary: [a] Use of our Products in any types of liquid, including water, oils, chemicals, and organic solvents [b] Use of our Products outdoors or in places where the Products are exposed to direct sunlight or dust [c] Use of our Products in places where the Products are exposed to sea wind or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2 [d] Use of our Products in places where the Products are exposed to static electricity or electromagnetic waves [e] Use of our Products in proximity to heat-producing components, plastic cords, or other flammable items [f] Sealing or coating our Products with resin or other coating materials [g] Use of our Products without cleaning residue of flux (even if you use no-clean type fluxes, cleaning residue of flux is recommended); or Washing our Products by using water or water-soluble cleaning agents for cleaning residue after soldering [h] Use of the Products in places subject to dew condensation 4. 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; if flow soldering method is preferred, please consult with the ROHM representative in advance. For details, please refer to ROHM Mounting specification Notice - GE © 2014 ROHM Co., Ltd. All rights reserved. Rev.002 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. You agree that application notes, reference designs, and associated data and information contained in this document are presented only as guidance for Products use. Therefore, in case you use such information, you are solely responsible for it and you must exercise your own independent verification and judgment in the use of such information contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of such information. Precaution for Electrostatic This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper caution in your manufacturing process and storage so that voltage exceeding the Products maximum rating will not be applied to Products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron, isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control). Precaution for Storage / Transportation 1. Product performance and soldered connections may deteriorate if the Products are stored in the places where: [a] the Products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2 [b] the temperature or humidity exceeds those recommended by ROHM [c] the Products are exposed to direct sunshine or condensation [d] the Products are exposed to high Electrostatic 2. Even under ROHM recommended storage condition, solderability of products out of recommended storage time period may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is exceeding the recommended storage time period. 3. Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads may occur due to excessive stress applied when dropping of a carton. 4. Use Products within the specified time after opening a humidity barrier bag. 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