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HA12155NT Fiches technique(PDF) 21 Page - Hitachi Semiconductor |
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HA12155NT Fiches technique(HTML) 21 Page - Hitachi Semiconductor |
21 / 57 page HA12155NT/HA12157NT Rev.4, Jun. 1997, page 21 of 57 Gain Control of Electronic Volume HA12155NT/HA12157NT is designed in order to change the gain by 6 bit DAC fabricated into IC. To reduce the click noise when changing volume gain instantaneously, required to connect the capacitor (CR time constant) to CNT pin (pin 6,59). These terminals are also be used as output pin of DAC. Therefore, by forcing voltage or current to these terminals, it is applicable to control volume gain directly. But, voltage forced to these terminals must be from V CC/2 –2 V to VCC/2 (for split supply use, –2 V to 0 V) in this case. In case of forcing the current these pins, voltage must be the value mentioned above even it is ±20% distributed of internal resistor (5.2 k Ω) of CNT pin. And, these case, change of a gain depending on a temperature gets large. The Tolerances of External Components for Dolby NR-Block For adequate Dolby NR tracking response, take external components shown below. For smooth capacitors of C13, C14, C25 and C26, please employ a few object of the leak, though you can be useful for an electrolytic capacitor. C25 0.1 10% C26 0.1 10% C27 2200 p 5% R23 560 2% C29 2200 p 5% C28 2200 p 5% R24 22 k 2% R29 18 k 2% 57 51 50 49 48 47 46 14 15 16 17 18 19 BIAS PB OUT (L) SS1 (L) SS2 (L) CCR (L) HLS DET(L) LLS DET(L) PB OUT (R) SS1 (R) SS2 (R) CCR (R) HLS DET(R) LLS DET(R) R11 22 k 2% C9 2200 p 5% C10 2200 p 5% R13 560 2% C12 2200 p 5% C13 0.1 10% C14 0.1 10% Unit R : C : F ±± ± ± ± ± ±± ± ± ± ± ± ± ± µ µ µ µ Ω HA12155/7 (REC 1 Chip) Figure 8 Tolerances of External Components Level Meter The coupling capacitor of LMIN pin (21 pin and 44 pin). For these capacitors please employ a small object of the leak. |
Numéro de pièce similaire - HA12155NT |
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Description similaire - HA12155NT |
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