參數(shù)資料
型號(hào)： CXA1372S
廠商： Sony Corporation
英文描述： RF Signal Processing Servo Amplifier for CD Player(710.00 k)
中文描述： 射頻信號(hào)處理伺服放大器的CD播放器（710.00十一）
文件頁(yè)數(shù)： 15/32頁(yè)
文件大小： 710K
代理商： CXA1372S
– 15 –
CXA1372BQ/BS
Focus OK circuit
15k
92k
VG
54k
20k
V
CC
0.625V
RFO
RFI
FOK
×
1
FOCUS OK AMP
FOCUS OK
COMPARATOR
RF signal
33
39
40
C5
0.01μ
The focus OK circuit creates the timing window okaying the focus servo from the focus search state.
The HPF output is obtained at Pin 39 from Pin 40 (RF signal), and the LPF output (opposite phase) of the
focus OK amplifier output is also obtained.
The focus OK output reverses when V
RFI
– V
RFO
≈
–0.37V.
Note that, C5 determines the time constants of the HPF for the EFM comparator and mirror circuit and the LPF
of the focus OK amplifier. Ordinarily, with a C5 equal to 0.01μF selected, the fc is equal to 1kHz, and block
error rate degradation brought about by RF envelope defects caused by scratched discs can be prevented.
EFM comparator
EFM comparator changes RF signal to a binary value. The asymmetry generated due to variations in disc
manufacturing cannot be eliminated by the AC coupling alone. Therefore, the reference voltage of EFM
comparator is controlled through 1 and 0 that are in approximately equal numbers in the binary EFM signals.
As this comparator is a current SW type, each of the High and Low levels is not equal to the power supply
voltage. A feedback has to be applied through the CMOS buffer.
R8, R9, C8, and C9 form a LPF to obtain (V
CC
+ DGND)/2V. When fc (cut-off frequency) exceeds 500Hz, the
EFM low-frequency components leak badly, and the block error rate worsens.
31
C8
C9
ASY
R8
R9
CMOS
BUFFER
CXD2500
100k
20k
VC
Vcc
40k
40k
AUTO ASYMMETRY
BUFFER
AUTO ASYMMETRY
CONTROL AMP
39
RFI
EFM COMPARATOR
32
EFM
DGND = 0V
×
6
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