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| Audio Accessory ICs Preamps with Built-in ALC BA3308F,BA3308FV No.10087EAT01 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 Vrms) 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 SOP14 BA3308FV SSOP-B14 www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 1/9 2010.04 - Rev.A BA3308F,BA3308FV Absolute maximum ratings(Ta=25) Parameter Supply voltage BA3308F Power dissipation BA3308FV Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 16 450*1 350*2 2575 55125 Unit V mW Technical Note *1 Reduce by 4.5 mW/C over 25C, when mounted on a 70mmx70mmx1.6mm PCB board. 2 * Reduce by 3.5 mW/C over 25C Operating conditions(Ta=25) Parameter Supply voltage Symbol VCC Min. 4.5 Typ. - Max. 14 Unit V Note: This IC is not designed to be radiation-resistant. Electrical characteristics(Unless otherwise noted, Ta=25, Vcc=7.0V, f=1kHz, BPF2020kHz) Parameter Quiescent current Open loop voltage gain Total harmonic distortion Input resistance Maximum output voltage Input conversion noise voltage ALC range ALC channel balance Channel separation Symbol IQ GVO THD RIN VOM VNIN ALC ALC CS Min. 1.5 70 15 0.6 40 60 Typ. 3.5 80 0.1 25 1.2 1 45 0 75 Max. 4.5 0.3 45 2 2.5 Unit mA dB % k Vrms Vrms dB dB dB THD=1% Rg=2.2k, referenced to NAB 34dB at 1kHz Rg=3.9 k, VIN-70 dBV standard, THD=3% VIN=-60dBV,-30dBV VO=0dBV, NAB 34dB VIN=0Vrms VOUT=-10dBV NAB34dB, VOUT=40mVrms Conditions Test Circuit Fig.17 Fig.17 Fig.17 Fig.17 Fig.17 Fig.17 Fig.17 Fig.17 Fig.17 www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 2/9 2010.04 - Rev.A BA3308F,BA3308FV Block diagram Technical Note BA3308F/FV OUTPUT1 1 GND N.C. 2 3 4 5 6 7 Vcc ALC 14 N.C. 13 INPUT1 12 N.C. 11 NF1 ALC VCC N.C. 10 NF2 9 8 INPUT2 N.C. OUTPUT2 Fig.1 www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 3/9 2010.04 - Rev.A BA3308F,BA3308FV Electrical characteristic curves (Reference data) Technical Note Fig.2 Quiescent current vs. power supply voltage Fig.3 Quiescent current vs. ambient temperature Fig.4 Voltage gain vs. frequency Fig.5 Total harmonic distortion vs. frequency Fig.6 Voltage gain vs. supply voltage Fig.7 Closed loop voltage gain vs. ambient temperature Fig.8 Input conversion noise voltage vs. signal source resistance Fig.9 Channel separation vs. frequency Fig.10 ALC characteristics Fig.11 Input/output characteristics Fig.12 Maximum output voltage vs. power supply voltage Fig.13 Maximum output voltage vs. load resistance www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 4/9 2010.04 - Rev.A BA3308F,BA3308FV Description of operations 1. Recording 1) Record amplifier BA3308 Cont Technical Note ch2 (ch1) 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. ch1 (ch2) ch2 (ch1) 2 13(9)(8) R1 (R2) 3.9k C1 (C2) 10F 1 11(10) (9) R5 (R6) 18k R3 (R4) 39 C3 (C4) 100F 3 (7) 1 4 5 C5 (C6) 10F C7 (C8) 22F R7 (R8) 1M 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 k 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. ch1 (ch2) ch2 (ch1) ch2 (ch1) Comp Cont 4.5VF BA3308 VOUT (DCAC) 1 (7) 4 13(9) 3 (7) 3VF R7 5 2 (8) C7 R1 (R2) Fig.15 Fig.6 www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 5/9 2010.04 - Rev.A 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 = R11R9/ (jC9R9)/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). Technical Note BA3308 A1 13(9) 2 (8) 11(10) 1 (9) C1 (C2) 10F R3 (R4) 39 R11 (R12) 4.3k R9 (R10) 120k C9 0.027F (C10) 1 (7) 3 (7) 4 5 C3 (C4) 100F INPUT C5 (C6) 10F OUTPUT Fig.16 Fig.7 www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 6/9 2010.04 - Rev.A BA3308F,BA3308FV Measurement circuit Technical Note V 10k OUTPUT1 10F 120k 1.2k 33k 2 0.1F SW4A 100F 22k 1 1 39 SW2A V2 30k INPUT1 V 2 3 SW6A V V1 1 2 1M SW5 22F VCC 14 13 12 ALC 3.9k SW3A 3 4 5 11 10 9 8 3.9k SW3B 220 6 330F 7 0.1F 1.2k 33k 2 SW4B 30k 39 SW2B V2 100F V 2.2k 2 SW1B 1 3 SW6B INPUT2 10F 10k V 120k OUTPUT2 1 V V1 Fig.17 Application circuit OUTPUT1 C3 R3 R5 18k 100F 39 C5 10F 1 2 R7 1M VCC=7V 14 R1 C5 INPUT1 10F 13 12 ALC 11 10 R2 C2 3.9k 3 22F C7 4 5 R8 220 C8 330F 6 7 R6 18k 9 8 3.9k 10F INPUT2 R4 C4 39 100F C6 10F R11 (R12) 4.3k R9 (R10) 120k OUTPUT2 For playback, connect the following NAB time constant circuit between C9 (C10) 0.027F pins 11 and 1 and pins 10 and 7 in place of R5 and R6. Fig.18 www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 7/9 2010.04 - Rev.A BA3308F,BA3308FV Technical Note 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 (c) 2010 ROHM Co., Ltd. All rights reserved. 8/9 2010.04 - Rev.A BA3308F,BA3308FV Ordering part number Technical Note B A 3 Part No. 3 0 8 F Package F: SOP14 FV: SSOP-B14 - E 2 Part No. Packaging and forming specification E2: Embossed tape and reel SOP14 8.7 0.2 (MAX 9.05 include BURR) 14 8 Tape Quantity Direction of feed 0.3MIN 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 ) 1 7 0.15 0.1 1.50.1 0.11 1.27 0.4 0.1 0.1 1pin (Unit : mm) Direction of feed Reel Order quantity needs to be multiple of the minimum quantity. SSOP-B14 5.0 0.2 14 8 Tape Quantity 0.3Min. Embossed carrier tape 2500pcs E2 The direction is the 1pin of product is at the upper left when you hold 6.4 0.3 4.4 0.2 Direction of feed ( reel on the left hand and you pull out the tape on the right hand ) 1 7 0.15 0.1 1.15 0.1 0.10 0.65 0.1 0.22 0.1 1pin (Unit : mm) Direction of feed Reel Order quantity needs to be multiple of the minimum quantity. www.rohm.com (c) 2010 ROHM Co., Ltd. All rights reserved. 9/9 2010.04 - 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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