MN662785TBUC Datasheet, PDF (24/89 Pages) Panasonic Semiconductor – LSI FOR COMPACT DISC/CD ROM PLAYER

MN662785TBUC


(B) Setting of the optical servo characteristics including the characteristics for anti-vibration
ɾGain constant
ɹɹɹFocus gain mantissa part
ɹFG ɹɹTracking gain mantissa part
ɹɹɹFocus gain exponent part
ɹFEXP ɹɹTracking gain exponent part
ɹɹT G
ɹɹTEXP
ɾPhase compensation and low-band compensation constant
Focus phase compensation constant ɹFC ɹɹTracking phase compensation constant ɹɹTC
Focus low-band compensation constant ɹFR ɹɹTracking low-band compensation constantɹTR
The above four constants can be set by writing 8-bit data (0 to 127) directly with the microcomputer
command.
Configuration
K
Z ^-1
+^ʵ
R
Ê´
Ì­
Ê´₊
ʵ
+^Ê´
G
Ê´
Ì®
C
Z ^-N
ɾfs of the focus system: 88.2 kHz
ɾfs of the tracking system: 88.2 kHz
ɾfs of the filter for low-band compensation: 44.1 kHz


ʨɹɹɹɹ ʩ

G
(Z)
1
ʹGɹɹ₁ɹʵɹ_Zʵɹ1 ɾR
Ê´
(1ʵCɾZ^ʵN)
G= ^{TG or FG}
2^8-TEXP
2^8-FEXP
R= ^{TR or FR}
2¹⁵
2¹⁵
K=1
C= ^{TC or FC}
128
128
N in Z^ʵN can be replaced with :
2 or 1 (by setting bit 1 of SET0) in case of the focus system.
1 in case of the tracking system.
SDD00026AEM
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