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AN8806SB Datasheet, PDF (6/10 Pages) Panasonic Semiconductor – Three-Beam Method Head Amplifier IC for CD Player | |||
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AN8806SB
ICs for CD/CD-ROM Player
s Operational Description (The values shown below are design values when supply voltage VCC = 5V.)
⢠RFAmplifier
As shown in Figure 1, RF signals are generated by three-beam method pick-up. Equivalent resistance to RFOUT (Pin7) is
57.6kâ¦, when resistance between RFâand RFOUT is 12kâ¦.
48kâ¦
12kâ¦
Light level
AB
DC
36
â
+
48kâ¦
35
â
RRF
6
7
10kâ¦
â
10kâ¦
+
Dark leve
+
RRF (T) =48k⦠Ã
RRF
10kâ¦
Figure 1 : RF Amplifier
⢠Focus Error Amplifier
As shown in Figure 2, the operation result of (A+ C) â (B + D) is outputted to FEOUT (Pin27). Equivalent resistance to
FEOUT is 96kâ¦, when resistance between FE and FEOUT is 20kâ¦.
48kâ¦
VCBA
36
â
A+C
20kâ¦
RFE
28
27
AB
+
â
â
DC
48kâ¦
20kâ¦
+
+
B+D
35
â
+
29
â
VC
+
Ã2
fC = 30kHz
Figure 2 : Focus Error Amplifier
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