Sharp CD-RW5000 Service Manual page 58

CD-RW5000
IC6 VHiTA2147F/-1:Servo Pre Amp. (TA2147F)
Pin No. Terminal Name
1 VCC
2 FNI
3 FPI
4 TPI
5 TNI
6 MDI
7 LDO
8 SEL
9 TEBC
10 TEN
11 TEO
12 RFDC
13 GVSW
14 VRO
15 FEO
16 FEN
17 RFRP
18 RFRPIN
19 RFGO
20 RFGC
21 AGCIN
22 RFO
23 RFN
24 GND
RFDC TEO TEN TEB
GVSW VRO FEO FEN
Input/Output
— 3.3V power supply terminal
Input Main beam amp input terminal
Input Main beam amp input terminal
Input Sub-beam amp input terminal
Input Sub-beam amp input terminal
Input Monitor photodiode amplifier input terminal
Output Laser diode amp output terminal
Input APC circuit ON/OFF signal, LDO terminal control input terminal and bottom/peak
detection frequency switching terminal
SEL
Input Tracking error balance adjustment signal input terminal
• TEBC input voltage
Input Tracking error signal generation amp antiphase input terminal
Output Tracking error signal generation amp output terminal
Output RF signal peak detection output terminal
Input AGC, FE, TE amp gain switching terminal
GVSW
Output Reference voltage (VRO) output terminal • VCC=3.3V: VRO=1/2 VCC
Output Focus error signal generation amp output terminal
Input Focus error signal generation amp antiphase input terminal
Output Signal generation amp output terminal for track count
Input Signal generation amp input terminal for track count
Output RF signal amplitude adjustment amp output terminal
Input RF amplitude adjustment control signal input terminal • RFGC input voltage
Input RF signal amplitude adjustment amp input terminal
Output RF signal generation amp output terminal
Input RF signal generation amp input terminal
— GND terminal
SEL LDO MDI TNI
RFRP RFRPIN RFGO RFGC
Figure 58 BLOCK DIAGRAM OF IC
APC circuit
GND OFF
Hi-z ON
VCC ON
Mode
GND CD-RW
Hi-z CD-DA
VCC CD-CA
TPI FPI FNI VCC
AGCIN RFO RFN GND
– 58 –
Function
LDO
Connection to VCC via 1kΩ
Control signal output
Control signal output
PIN
TEB
SEL
(TE_BAL)
V (APC_SW)
CTRL
V
APC ON -50%
CC
HiZ
APC ON 0%
APC OFF
GND
+50%
(LDO=H)
RFGC GVSW
(CD/RW)
(AGC_Gain)
DA
+12dB
(0dB)
DA
+6dB
(0dB)
RW
0dB
(+12dB)