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| Optical disc ICs Preservo amplifier for CD players BA6377K The BA6377K is a preservo amplifier that generates RF, focus error and tracking error signals from the signals output by current output optical pickups. Using this IC in combination with the 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. FAbsolute maximum ratings (Ta = 25_C) 4) Internal APC circuit. 5) Internal focus protection against disk defects. FRecommended operating conditions (Ta = 25_C) 71 Optical disc ICs FBlock diagram BA6377K FPin descriptions 72 Optical disc ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 5V) BA6377K 73 Optical disc ICs BA6377K 74 Optical disc ICs FMeasurement circuit BA6377K 75 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. BA6377K 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. 76 Optical disc ICs FApplication example BA6377K 77 Optical disc ICs FElectrical characteristic curves BA6377K FExternal dimensions (Units: mm) 78 |
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