1-38 (No.49868)
• 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
Reference voltage (VRO) output pin
*VRO=1/2VCC When VCC=3.3V
Focus error signal generation amp output pin
Focus error signal generation amp negative-phase input pin
Signal amp output pin for track count
Combining RFRP signal and TEO signal with TC94A14F/FA configures tracking search system.
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
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