CXA2581 데이터 시트보기 (PDF) - Sony Semiconductor
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CXA2581 Datasheet PDF : 22 Pages
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CXA2581N
• Focus Error
The signals input to the A and C pins and the B and D pins are arithmetically amplified and the focus error
signal is output.
This circuit has RW/ROM switching and offset addition functions.
VC
100k
ROM
23.5k
A6
C8
B7
D9
ROM
VOFST
RW
30k
30k
30k
30k
47k
200k
FE = Gain { (B + D) – (A + C) }
Low frequency gain ROM: 16dB
RW: 28dB
RW
100k
ROM
47k
RW
200k
FEI 17
124
50k
DVC
16 FE
124
Cut-off frequency fc (typ.) ROM: 300kHz
RW: 300kHz
• Tracking Error
The signals input to the E and F pins are arithmetically amplified and the tracking error signal is output.
This circuit has RW/ROM switching and offset addition functions.
TE_BAL 19
20k
F
10
gm
20k 11 E gm
ROM
VOFST
VC
RW
20k
63k
251k
10k
63k ROM
251k RW
DVCC
20k
10k
VC
31.5k
125.5k
ROM RW
TE = Gain (F – E)
Low frequency gain ROM: 16dB
RW: 28dB
18 TE
TE balance adjustment
F – E low frequency gain = ±6dB
DVC
External resistance value vs. Low frequency gain
Low frequency
gain [dB]
22
16
12.5
Resistance value [Ω]
10k
20k
30k
– 11 –
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