LG HB954TB, Service Manual, Page: 112 / 121

4-17
1-3. Pin Function
PIN NO PIN NAME TYPE DESCRIPTION
RF Signals & S/H Control Pulses (21)
5 TRINA Analog Input Input of Tracking Signal (A)
6 TRINB Analog Input Input of Tracking Signal (B)
7 TRINC Analog Input Input of Tracking Signal (C)
8 TRIND Analog Input Input of Tracking Signal (D)
9 INA Analog Input Input of Main Beam Signal (A)
10 INB Analog Input Input of Main Beam Signal (B)
11 INC Analog Input Input of Main Beam Signal (C)
12 IND Analog Input Input of Main Beam Signal (D)
14 INE Analog Input Input of Sub-Beam Signal (E)
15 INF Analog Input Input of Sub-Beam Signal (F)
16 ING Analog Input Input of Sub-Beam Signal (G)
17 INH Analog Input Input of Sub-Beam Signal (H)
19 FOIP/RRFSUM Analog Input
Input of Focusing Signal (Positive)
Alternative Function : Read RF sum
20 FOIN Analog Input Input of Focusing Signal (Negative)
24 RFIN Analog Input Differential Input of AC Coupling RF SUM Signal (Negative)
25 RFIP Analog Input Differential Input of AC Coupling RF SUM Signal (Positive)
26 RFIP2 Analog Input Differential Input of AC Coupling RF SUM Signal (Positive)
27 RFIN2 Analog Input Differential Input of AC Coupling RF SUM Signal (Negative)
47 GAINSW Analog Output Read gain switch. 1
48 GAINSW2 Analog Output Read gain switch 2.
49 GAINSW3 Analog Output Read gain switch 3.
EQRF Circuits (1)
128 EQBIAS Analog Output
External Bias Connection for Circuits in EQRF Block & SATA Block.
The external resistor need meet the precision for SATA requirement. (23.1K, 1%)
APC (Auto Power Control for Laser) (6)
22 FPDODVD Analog Input Laser Power Monitor Input for DVD APC / Differential positive input
23 FPDOCD Analog Input Laser Power Monitor Input for CD APC / Differential negative input
121 VRDCO Analog Output Output Voltage of Laser Diode Control in Read APC
122 VRDC1O Analog Output Output Voltage 1 of Laser Diode Control in Read APC
123 VRDC2O Analog Output Output Voltage 2 of Laser Diode Control in Read APC
124 VRDC3O Analog Output Output Voltage 3 of Laser Diode Control in Read APC
Reference Voltages & DACs (5)
1 V14 Analog Output Output of Voltage Reference (1.4V)
2 VFVREF Analog Output Output of Voltage Reference
3 HAVC Analog Output Decoupling Pin for Reference Voltage of Main and Sub Beams
28 REG_CAP Analog Output Output of Voltage Reference
125 VDAC0 Analog Output Output of General DAC
MPXOUT (Multiplexer Circuit for Various Signals) and Testing Interface (4)
117 MPXOUT3/MON/GO Analog Output
Multiplexer Output 3 for Signal Monitoring.
Alternate function : Internal monitored signal output / General output.
118 MPXOUT2/MON/GO Analog Output
Multiplexer Output 2 for Signal Monitoring.
Alternate function : Internal monitored signal output / General output.
119 MPXOUT1/MON/GO Analog Output
Multiplexer Output 1 for Signal Monitoring.
Alternate function : Internal monitored signal output / General output
126 AUX1 Analog I/O Auxiliary Input.Alternative Function : Signal Monitoring
RF Power Supplies (11)
4 AGND_1 Analog Ground Ground Pin
13 AVDD33_2 Analog Power(3.3V) Power Pin
18 AGND_2 Analog Ground Ground Pin
21 AVDD12_2 Analog Power(1.2V) Power Pin
29 AGND_3 Analog Ground Ground Pin
30 AVDD33_3 Analog Power(3.3V) Power Pin