Sharp XL-UH250 Service Manual - Page 90

IC1 VHITC94A70FG5: CD MP3 DECODER 4/4, Pin Description

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XL-UH250 IC1 VHITC94A70FG5: CD MP3 DECODER (4/4) Pin Description Pin No. Symbol 88 AGCi Input / Output Description Input 3AI/F RF signal AGC amplifier input pin. Default Input Remarks 89 Rfo Output 3AI/F RF signal generation amplifier output pin. Output 90 RVDD3 Power supply for 3.3V RF amplifier core circuit. 91 LDo 92 MDi 93 RVSS3 94 FNi2 95 FNi1 96 FPi2 97 FPi1 98 TPi 99 TNPC 100 TNi Output 3AI/F Input 3AI/F Input 3AI/F Input 3AI/F Input 3AI/F Input 3AI/F Input 3AI/F Output 3AI/F Input 3AI/F Laser diode amplifier output pin. Monitor photodiode amplifier input pin. Grounding pin for RF amplifier core circuit. Main beam signal input pin. To be connected to PIN diode C. Main beam signal input pin. To be connected to PIN diode A. Main beam signal input pin. To be connected to PIN diode D. Main beam signal input pin. To be connected to PIN diode B. Sub beam signal input pin. To be connected to PIN diode F. TNI/TPI input common capacitor connection pin. Sub beam signal input pin. To be connected to PIN diode E. Input Reference Voltage=178mVtyp. Input Input Input Input Input Output Input Connect to VRO by capacitor. * 3A I/F : 3 V analog circuit input/output pin. 1.5 I/F : 1.5Vdigital input/output pin. 3 I/F : 3 V digital input/output pin. Note: The servo output pins (FOO, TRO, FMO, and DMO) become undefined or GND level under the following conditions: • /RST pin = Low • Crystal oscillation stopped according to the instructions by the Stop crystal oscillation command. • Power supply for CD is OFF. • SRAMSTB pin = High To prevent the undefined pin states from affecting the servo circuitry or any other mechanical blocks in the system, appropriate measures should be taken, such as using a driver IC supporting a standby feature to place the system in standby mode while either of the above conditions is satisfied. 8 - 6

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XL-UH250
8 – 6
IC1 VHITC94A70FG5: CD MP3 DECODER (4/4)
Pin Description
* 3A I/F : 3 V analog circuit input/output pin.
1.5 I/F : 1.5Vdigital input/output pin.
3 I/F : 3 V digital input/output pin.
Note: The servo output pins (FOO, TRO, FMO, and DMO) become undefined or GND level under the following conditions:
• /RST pin = Low
• Crystal oscillation stopped according to the instructions by the Stop crystal oscillation command.
• Power supply for CD is OFF.
• SRAMSTB pin = High
To prevent the undefined pin states from affecting the servo circuitry or any other mechanical blocks in the system, appropriate
measures should be taken, such as using a driver IC supporting a standby feature to place the system in standby mode while
either of the above conditions is satisfied.
Pin
No.
Symbol
Input / Output
Description
Default
Remarks
88
AGCi
Input 3AI/F
RF signal AGC amplifier input pin.
Input
89
Rfo
Output 3AI/F
RF signal generation amplifier output pin.
Output
90
RVDD3
Power supply for 3.3V RF amplifier core circuit.
91
LDo
Output 3AI/F
Laser diode amplifier output pin.
92
MDi
Input
3AI/F
Monitor photodiode amplifier input pin.
Input
Reference
Voltage=178mVtyp.
93
RVSS3
Grounding pin for RF amplifier core circuit.
94
FNi2
Input 3AI/F
Main beam signal input pin. To be connected to PIN
diode C.
Input
95
FNi1
Input 3AI/F
Main beam signal input pin. To be connected to PIN
diode A.
Input
96
FPi2
Input 3AI/F
Main beam signal input pin. To be connected to PIN
diode D.
Input
97
FPi1
Input
3AI/F
Main beam signal input pin. To be connected to PIN
diode B.
Input
98
TPi
Input 3AI/F
Sub beam signal input pin. To be connected to PIN
diode F.
Input
99
TNPC
Output 3AI/F
TNI/TPI input common capacitor connection pin.
Output
Connect to VRO by capacitor.
100
TNi
Input 3AI/F
Sub beam signal input pin. To be connected to PIN
diode E.
Input