■ LC78645E (IC501)
Digital Servo Block Diagrams
• Overview
The focus servo circuit performs analog/digital conversion on FE(the focus error signal), while the tracking
and sled servo circuits do so on TE(the tracking error signal), then they each pass that result through an
equalizer, perform digital/analog conversion, and output it, At the spindle servo, based on the EFM signal
during CLV control or the FG signal during CAV control, the calculated value passes through an equalizer,
undergoes digital/analog conversion, and is output.
■ BU2090F (IC501)
-12 -bit, Serial IN, parallel OUT driver
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