Preservo amplifier for CD players
Optical disc ICs
Preservo amplifier for CD players
BA6386K
The BA6386K is a preservo amplifier for CD players. By using...
Description
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)
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Optical disc ICs
FBlock diagram
BA6386K
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Optical disc ICs
FPin descriptions
BA6386K
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Optical disc ICs
FElectrical characteristics (unless otherwise noted, Ta = 25_C and VCC = 2.5V)
BA6386K
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Optical disc ICs
BA6386K
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Optical disc ICs
FMeasurement circuit
BA6386K
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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.
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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...
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