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CXA1821M View Datasheet(PDF) - Sony Semiconductor

Part Name
Description
View to exact match
CXA1821M
Sony
Sony Semiconductor Sony
CXA1821M Datasheet PDF : 13 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
CXA1821M
Description of Functions
RF Amplifier
Each signal current from the photodiodes A, B, C and D is I-V converted, and input to Pins 3, 4, 5 and 6.
These signals are added by the RF summing amplifier and equalized by the RF equalizing amplifier and then
output to Pin 16. When the RF signal is equalized, an equalizing circuit is added to Pin 17.
A
I-V
3
A
24k
B
I-V
4
B
24k
C
I-V
5
C
24k
D
I-V
6
D
24k
GND
RF SUMMING AMP
28k
10k
5.6k
RF EQAMP
RFE
17
22k
RFO
16
RFOUT
4.9k
7.3k
VC
VC
Focus Error Amplifier
The operation of (B + D) – (A + C) is performed and the signal is output to Pin 15. Pin 14 is used for bias
adjustment of the focus error signal.
A
I-V
3
A
30k
B
I-V
4
B
30k
C
I-V
5
C
30k
D
I-V
6
D
30k
GND
25p
174k
87k 25p
FOCUS
164k ERROR AMP
VC
FE
15
FEOUT
VCC
FE BIAS
FOCUS
14
47k BIAS
GND
–7–
 

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