CXD3003 datasheet(116/137 Pages) SONY

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CXD3003R

$3A (preset: $3A 00 00)

D15

D14

D13

D12

D11

D10

FBON FBSS FBUP FBV1 FBV0

TJD0 FPS1 FPS0 TPS1 TPS0

SJHD INBK MTI0

FBON:

FBIAS (focus bias) register addition (on/off)

The FBIAS register value is added to the signal loaded into the FCS In register by FBON = 1

(on).

FBSS:

FBIAS (focus bias) register/counter switching

FBSS = 0: register, FBSS = 1: counter.

FBUP:

FBIAS (focus bias) counter up/down operation switching

This performs counter up/down control when FBSS = 1. FBUP = 0: down counter,

FBUP = 1: up counter.

FBV1, FBV0:

FBIAS (focus bias) counter voltage switching

The number of FCS BIAS count-up/-down steps per cycle is decided by these bits.

TJD0:

This sets the tracking servo filter data RAM to 0 when switched from track jump to servo on

only when SFJP = 1 (during surf jump operation).

FPS1, FPS0:

Gain setting when transferring data from the focus filter to the PWM block.

TPS1, TPS0:

Gain setting when transferring data from the tracking filter to the PWM block.

This is effective for increasing the overall gain in order to widen the servo band.

Operation when FPS1, FPS0 (TPS1, TPS0) = 00 is the same as usual (7-bit shift). However,

6dB, 12dB and 18dB can be selected independently for focus and tracking by setting the

relative gain to 0dB when FPS1, FPS0 (TPS1, TPS0) = 00.

SJHD:

This holds the tracking filter output at the value when surf jump starts during surf jump.

INBK:

When INBK = 0 (off), the brake circuit masks the tracking drive signal with TRKCNCL which is

generated by taking the MIRR signal at the TZC edge. When INBK = 1 (on), the tracking filter

input is masked instead of the drive output.

MTI0:

The tracking filter input is masked when the MIRR signal is high by setting MTI0 = 1 (on).

The counter changes once for each

sampling cycle of the focus servo filter.

When MCK is 128Fs, the sampling

frequency is 88.2kHz. When converted

to FE input, 1 step is approximately 1/29

× VDD/2, VDD = supply voltage.

FBV1

FBV0

Number of steps per cycle

FPS1

FPS0

0dB

+6dB

+12dB

+18dB

Relative gain

TPS1

TPS0

0dB

+6dB

+12dB

+18dB

Relative gain

∗

∗: preset

∗

∗: preset

∗

CXD3003 датащи(PDF) 116 Page - Sony Corporation

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