S5L1462B Datasheet, PDF (31/43 Pages) Samsung semiconductor – CD and DVD playback

RF SIGNAL PROCESSOR
RF SUM & AGC AMP BLOCK
RFP1
RFP2
RFP3
RFP4
GAIN_RFSUM
+
+ _{RF SUM}
+
+ AGC AMP
-
+
S5L1462B
RFAGCO
EQIN
VCC
AGCC
GND
SW
Control on/off
-
COMP
+
-
+
AGC_LVL
AGCB
BOTTOM
PEAK
AGCP
GND
• The RF SUM AMP either adds or subtracts the input signal selected in the RF Multiplexer by the RFSUM_SEL
and compensates according to the I/V polarity using ADDRESS 00H's BUF_SEL, to produce the RF signal.
Also, the RF SUM AMP is able to adjust the LEVEL by the gain selected by GAIN_RFSUM (-6 – -16dB).
• The RF AGC circuit makes the signal whose gain was adjusted by the RFSUM AMP into a regular size. The
AGC circuit's output size is selected according to the value of AGC_LVL (3.2V – 3.75V), between 0.5Vpp --
1.25Vpp in increments of 0.25Vpp STEP. The AGC's response time constant is decided by the resistance
capacity of the Capacitor connected to the external connection PIN (AGCP, AGCB, AGCC).
• SW is prohibited the peaking by hold the AGC voltage when meet the defect or interruption
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