Pioneer DEH-3770MP Manuel d'utilisateur télécharger pdf (Page 4)

234

CX-3158

1.1.2 RF and RFAGC amplifiers

The photo-detector outputs (A + C) and (B + D) are added, amplified, and equalized inside this LSI, and then provided

as the RF signal from the RFI terminal. The RF signal can be used for eye-pattern check.

The low frequency component of the RFO voltage is:

RFO = (A + B + C + D) x 2

The RFO is used for the FOK generation circuit and RF offset adjustment circuit.

The RFI output from the pin 119 is A/C-coupled outside this LSI, and returned to the pin 118 of this LSI. The signal is

amplified in the RFAGC amplifier to obtain the RFAGC signal. This LSI is equipped with the RFAGC auto-adjustment

function as explained below. This function automatically controls the RFO level to keep at 1.5V by switching the feed-

back gain for the RFAGC amplifier.

The RFO signal is also used for the EFM, DFCT, MIRR, and RFAGC auto-adjustment circuits.

Fig. 1.1.2 RF/AGC/FE

PICKUP UNIT

A+C

VREF

125

10K

15R2K

VREF

For RFOK generation

To DEFECT/A3T detection

FE A/D

RFOFF setup

61K

8R8K

35K

111K

8R8K

10K

127

128

126

B+D

CD CORE UNIT

UPD63763GJ

RFOFF setup

136

FEO

135

FE-

20K 11R2K

119

RFO

118

AGCI

7R05K

10K 10K

1R2K

5R6K

4R7K

1R2K

33P

56P

123

RF-

122

RF2-

116

AGCO

121

EQ1

120

EQ2

1 2 3 4 5 6 7 8 9 ... 23 24

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Pioneer DEH-3770MP Manuel d'utilisateur Page 4

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