S5L1462B Datasheet, PDF (36/43 Pages) Samsung semiconductor – CD and DVD playback

S5L1462B
ABCD SUM AMP
RF SIGNAL PROCESSOR
A
C
-
GAIN_ABCD
B
INV
15dB
ABCD
D
+
AMP
ABCD_OFST
• The input signals A, B, C, D are operated as ABCD = A+B+C+D in the ABCD SUM Amp. The gain is
compensated by Address 03H's GAIN_ABCD from 0dB - +30dB to account for the difference in disc reflectivity
according to disc type. The OFFSET is adjusted by the BACDOFST, then the signal is output as ABCD.
• The frequency characteristics of the output AMP are fc = 4MHz when in CD 2x mode, and fc=10MHz in DVD
mode.
FOK DETECT CIRCUIT
ABCD
-
-
ABCDI
+
COMP
FOK_TH
+
FOKB
• This circuit generates the FOCUS OK signal for the SERVO. It consists of a circuit that detects the PEAK of
the ABCD SUM signal, and the circuit that outputs the FOKB signal.
• It compares and outputs the ABCD SUM signal's output signal and the comparison LEVEL(FOK_TH).
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