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HA12215F Datasheet(PDF) 15 Page - Hitachi Semiconductor |
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HA12215F Datasheet(HTML) 15 Page - Hitachi Semiconductor |
15 / 69 page HA12215F Rev.5, Oct. 1999, page 15 of 69 BIAS (N) Pin 33 BIAS (M) Pin 31 R22 Vbias R21 R19 BIAS (C) Pin 32 R20 VEE Figure 10 External Components of Bias Block Automatic Level Control ALC is the input decay rate variable system. It has internal variable resistors of pin 55 (pin 44) by RECOUT signal that is inputted to pin 9 (pin 34). The operation is similitude to MS, detected by pin 13. The signal input pin is pin 56 (pin 43). Resistor R1, R2 and capacitor C2, external components, for the input circuit are commended as figure 12. There are requested to use value of the block diagram figure for performance maintenance of S/N, T.H.D. etc. Figure 11 shows the relation with R1 front RIN point and ROUT. ALC operation level acts for the center of +4.5 dB at tape position TYPE I, IV and the center of +2.5 dB at tape position TYPE II, to standard level (300 mVrms). Then, adopted maximum value circuit, ALC is operated by a large channel of a signal. ALC ON/OFF can switch it by pin 15. Please do ALC ON, after it does for one time ALC OFF inevitably, for ALC time to start usefully (when switching PB → PASS, when switching PB → PASS), in order to reset ALC circuit. RIN TYPE II 2.5dB 300mV TYPE I, IV 4.5dB Figure 11 ALC Operation Level |
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