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(No.49793)1-47
• Pin function
Pin No. Symbol I/O Function
1 VCC - 3.3V power supply pin
2 FNI I Main-beam amp input pin
3 FPI I Main-beam amp input pin
4 TPI I Sub-beam amp input pin
5 TNI I Sub-beam amp input pin
6 MDI I Monitor photo diode amp input pin
7 LDO O Laser diode amp output pin
8 SEL I APC circuit ON/OFF control signal, laser diode (LDO) control signal input
or bottom/peak detection frequency change pin.
9 TEB I Tracking error balance adjustment signal input pin
Adjusts TE signal balance by eliminating carrier component from PWM signal (3-state output,
PWM carrier = 88.2kHz) output from TC94A14F/FA
TEBC pin using RC-LPF and inputting DC.
TEBC input voltage:GND~VCC
10 TEN I Tracking error signal generation amp negative-phase input pin
11 TEO O Tracking error signal generation amp output pin.
Combining TEO signal RFRP signal with TC94A14F/FA configures tracking search system.
12 RFDC O RF signal peak detection output pin
13 GVSW I AGC/FE/TE amp gain change pin
14 VRO O Reference voltage (VRO) output pin
*VRO=1/2VCC When VCC=3.3V
15 FEO O Focus error signal generation amp output pin
16 FEN I Focus error signal generation amp negative-phase input pin
17 RFRP O Signal amp output pin for track count
Combining RFRP signal and TEO signal with TC94A14F/FA configures tracking search system.
18
19
20
REIS
RFGO
RFGC
I
O
I
RF signal amplitude adjustment amp output pin
RF amplitude adjustment control signal input pin
Adjusts RF signal amplitude by eliminating carrier component from PWM signal (3-state output,
PWM carrier=88.2kHz)output fromTC94A14F/14FA *RFGC pin using RC-LPF and inputting DC.
*RFGC input voltage:GND~VCC
21 AGCIN I RF signal amplitude adjustment amp input pin
22 RFO O RF signal generation amp output pin
23 RFI I RF signal generation amp input pin
24 GND - GND pin
SEL
GND
Hiz
VCC
APC
circuit
LDO
OFF Connected VCC through 1k resistor
ON
Control signal output
ON Control signal output
VCC
GVSW Mode
GND
Hiz
CD-RW
Normal