BA6386K

Optical disc ICs Preservo amplifier for CD players BA6386K The BA6386K is a preservo amplifier for CD players. By using this paired with a ROHM DSP, a servo and main signal system can be configured with few external components and low power consumption. FApplications CD players FFeatures 1) Internal RF AGC circuits. 2) Internal APC circuit. 3) Internal auto asymmetry circuit. 4) Internal disc defect detector. 5) Internal focus protect function against disc defects. FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 513 Optical disc ICs FBlock diagram BA6386K 514 Optical disc ICs FPin descriptions BA6386K 515 Optical disc ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C and VCC = 2.5V) BA6386K 516 Optical disc ICs BA6386K 517 Optical disc ICs FMeasurement circuit BA6386K 518 Optical disc ICs FCircuit operation (1) RF amplifier, FOK comparator BA6386K RFO is shifted downwards from VB by 0.9V. However, the resistance between pins 23 and 24 is set to 20kΩ and if this resistance is changed, use external components to adjust the shift back to 0.9V. Have the feedback resistance 10kΩ or greater. If the DC component of RF rises 0.3V, then FOK becomes high. 519 Optical disc ICs (2) FE amplifier and focus search BA6386K The voltage for focus search is obtained by the charging and discharging of the capacitor attached to pin 8. The charging current is I/10 and the discharging current is I. The FEO output ampl...