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LC78624E Datasheet(PDF) 11 Page - Sanyo Semicon Device |
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LC78624E Datasheet(HTML) 11 Page - Sanyo Semicon Device |
11 / 27 page • CLV mode In CLV mode the LC78624E detects the disk speed from the HF signal and provides proper linear speed using several different control schemes by switching the DSP internal modes. The PWM reference period corresponds to a frequency of 7.35 kHz. The V/P pin outputs a high level during rough servo and a low level during phase control. • Rough servo gain switching For 8 cm disks, the rough servo mode CLV control gain can be set about 8.5 dB lower than the gain used for 12 cm disks. • Phase control gain switching The phase control gain can be changed by changing the divisor used by the dividers in the stage immediately preceding the phase comparator. No. 5811-11/27 LC78624E Internal mode CLV+ CLV– V/P Rough servo (velocity too low) High Low High Rough servo (velocity too high) Low High High Phase control (PCK locked) PWM PWM Low Code Command RES = low $B1 CLV PHASE COMPARATOR DIVISOR: 1/2 $B2 CLV PHASE COMPARATOR DIVISOR: 1/4 $B3 CLV PHASE COMPARATOR DIVISOR: 1/8 $B0 NO CLV PHASE COMPARATOR DIVISOR USED q q Code Command RES = low $A8 DISC 8 cm SET $A9 DISC 12 cm SET q q A09906 |
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