CXA2581 Sony Corporation, CXA2581 Datasheet - Page 11

• Manufacturer Part Number: CXA2581
• Description: RF Signal Processor for CD Players
• Manufacturer: Sony Corporation

• 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.
• 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.
20k
20k
FE = Gain { (B + D) – (A + C) }
Low frequency gain
Cut-off frequency fc (typ.) ROM: 300kHz
10
11
F
E
TE_BAL
gm
gm
VOFST
Low frequency
gain [dB]
12.5
22
16
19
External resistance value vs. Low frequency gain
10k
VC
VC
ROM
ROM: 16dB
RW: 28dB
C
D
A
B
RW
VOFST
6
8
7
9
RW: 300kHz
23.5k
ROM
ROM
RW
30k
30k
30k
30k
47k
200k
20k
20k
31.5k
251k
ROM
63k
VC
RW
100k
10k
10k
47k
200k
DVC
20k
– 11 –
RW
ROM
RW
125.5k
251k
63k
DV
ROM
RW
CC
50k
FEI
124
DVC
18
17
30k
TE
100k
Resistance value [ ]
TE = Gain (F – E)
Low frequency gain
TE balance adjustment
F – E low frequency gain = ±6dB
16
124
FE
ROM: 16dB
RW: 28dB
CXA2581N