Audio Accessory ICs Preamps with Built-in ALC BA3308F,BA3308FV No.11087EBT01 ●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 2011.08 - Rev.B 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 2011.08 - Rev.B Technical Note BA3308F,BA3308FV ●Block diagram BA3308F/FV 14 N.C. OUTPUT1 1 GND 2 N.C. 3 ALC ALC 4 V CC 5 N.C. 6 OUTPUT2 13 INPUT1 12 N.C. 11 NF1 V cc 7 10 NF2 9 INPUT2 8 N.C. Fig.1 www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 3/9 2011.08 - Rev.B 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 2011.08 - Rev.B 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 2011.08 - Rev.B 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 C9 0.027μF (C10) C3 (C4) 100μF INPUT R9 (R10) 120k 31 (7) (7) 45 C5 (C6) 10μF OUTPUT Fig.16 Fig.7 2011.08 - Rev.B Technical Note BA3308F,BA3308FV ●Measurement circuit V 10k 100μF 22k OUTPUT1 10μF 1 120k 1.2k 39Ω V SW2A V SW6A 3 V1 V2 33k 2 2 1 INPUT1 30k SW4A 0.1μF 1 14 2 13 1M 3 SW5 22μF 220Ω 330μF 3.9k SW3B 11 5 10 6 9 7 8 1.2k SW3A 12 ALC 4 VCC 3.9k 0.1μF 2 SW4B 30k 33k 1 120k 10μF 39Ω SW2B V2 V 10kΩ 3 1 OUTPUT2 V 100μF 2.2k INPUT2 SW6B 2 SW1B V V1 Fig.17 ●Application circuit OUTPUT1 C5 10μF C3 R3 R5 100μF 39Ω 18kΩ R7 1MΩ C7 22μF 1 14 2 13 3 12 ALC 4 VCC=7V 330μF 220Ω C8 3.9kΩ C5 INPUT1 10μF 11 5 R8 R1 10 6 9 7 8 R2 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 2011.08 - Rev.B 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 2011.08 - Rev.B 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. 2011.08 - Rev.B 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. 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