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52
MN103SA6G
Write
Strategy
IC 201
CN 101
Optical
Pick-up
LPC-812R
LD
PD
LDD
Serial
I/F
D/A
D/A
D/A
D/A
D/A
D/A
M
P
X
IC 121
AN22113A
APC
19
A/D
ADSC
S/H
Signal
FM
123
VPD
127 FPDM
124
VREFPD
40
41
42
SH1
SH2
SH3
VGA
LPF
Ave
Erase
Space
VGA
S/H2
S/H3
S/H1
DESCRIPTION OF CIRCUIT
1. ALPC (Automatic Laser Power Control) Circuit
1-1. Block Diagram
1-2. ALPC (Automatic Laser Power Control) Circuit Operation
The ALPC block detects the laser output power of the front monitor. The power signal detected with the PD for front monitor
detection is input the voltage from the VPD pin(123Pin) or the FPDM pin(127Pin), the reference signal of the input signal is
input from the VREFPD pin(124Pin). The ALPC block generates the singals from the input laser power signals in the
following detection systems. This block has four detection paths:All average value path, multi pulse average/peak value
detection path, erase/bottom value detection path, space/playback power value detection path.
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