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BA3308FV-E2 Datasheet(PDF) 5 Page - Rohm |
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BA3308FV-E2 Datasheet(HTML) 5 Page - Rohm |
5 / 13 page Technical Note 5/9 BA3308F,BA3308FV www.rohm.com 2012.06 - Rev.C © 2011 ROHM Co., Ltd. All rights reserved. ●Description of operations 1. Recording 1) Record amplifier 2) ALC Fig.5 BA3308 Cont ch2 (ch1) ch2 (ch1) ch1 (ch2) 2 (8) 1 (9) 3 (7) 5 3.9k 10 F INPUT 39 18k 1M 100 F 10 F 22 F OUTPUT R1 (R2) R3 (R4) R5 (R6) R7 (R8) C1 (C2) C3 (C4) C5 (C6) C7 (C8) Fig.14 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 Ω 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. 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. 13(9) 11(10) 1 (7) 4 Fig.6 ch2 (ch1) ch2 (ch1) ch1 (ch2) Cont Comp BA3308 3 (7) 5 2 (8) 4.5VF VOUT (DC AC) 3VF R7 C7 R1 (R2) Fig.15 1 (7) 4 13(9) |
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