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| Optical disc ICs Preservo amplifiers for CD players BA6376K The BA6376K is a preservo amplifier that generates RF, focus error and tracking error signals from the signals output by voltage output optical pickups. Using this IC in combination with ROHM's DSP can significantly reduce the number of attached components for CD player servos and signal processing circuits. FApplications CD players FFeatures 1) Internal focus search sequence, for better playability. 2) Internal disk defect detector. 3) Internal auto asymmetry circuit. 4) Internal APC circuit. 5) Internal focus protection against disk defects. FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 63 Optical disc ICs FBlock diagram BA6376K FPin descriptions 64 Optical disc ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 3.4V) BA6376K 65 Optical disc ICs BA6376K 66 Optical disc ICs FMeasurement circuit BA6376K 67 Optical disc ICs FCircuit operation Focus search sequence operations When the loop turns on The focus loop turns on when the fall of FEC is detected while FOK is at the HIGH level. BA6376K When the loop turns off The focus loop turns off after the elapse of a delay (T[S], see below) after FOK changes to the LOW state. 68 Optical disc ICs FApplication example BA6376K 69 Optical disc ICs FElectrical characteristic curves BA6376K FExternal dimensions (Units: mm) 70 |
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