S5L1462B Datasheet, PDF (40/43 Pages) Samsung semiconductor – CD and DVD playback

S5L1462B
ALPC CIRCUIT
RF SIGNAL PROCESSOR
-
+
VBGO
PDDVD
+
20k
-
LD_SEL
VCC
MUX
3.5k
GND
+
PDCD _20k
-
LD_SEL
VCC _MUX
3.5k
GND
LDODVD
VCC
+
PICK-UP
+
GND
VCC
+
LDOCD
PICK-UP
+
GND
• This circuit is for controlling the Laser Diode's amount of light. It sets the amount of light that is output during
playback, and stabilizes it by detecting the fluctuation in Laser Power for voltage or temperature change using
the Monitor Photo Diode's output current change.
• ALPC for CD and DVD are separate. ALPC circuit selection and On/Off are controlled by Add 00H's LDONB.
The unselected ALPC maintains Off status.
• The ALPC reacts to the P-SUB LASER DIODE. Its standard voltage can be changed by the value of the external
ZENER DIODE connected to the VREFLP_BGI block.
• PD's standard input voltage range is 100mV -- 0.5V.
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