Sharp CDC2900 - 3-CD Compact Stereo System Service Manual page 49

IC2 VHiLC78622N-1: Servo/Signal Control (LC78622NE) (1/2)
Pin
Terminal Name Input/Output
No.
1 DEFI Input
2 TAI Input
3 PDO Output
4 VVSS
5 ISET Input
6 VVDD
7 FR Input
8 VSS
9 EFMO Output
10 EFMIN Input
11 TEST2 Input
12 CLV+ Outout
13 CLV- Output
14 V/P Output
15 HLF Intput
16 TES Input
17 TOFF Output
18 TGL Output
19 JP+ Output
20 JP- Output
21* PCK Output
22* FSEQ Output
23 VDD
24 CONT1 Input/Output General-use input/output terminal 1.
25 CONT2 Input/Output General-use input/output terminal 2.
26 CONT3 Input/Output General-use input/output terminal 3.
27 CONT4 Input/Output General-use input/output terminal 4.
28* CONT5 Input/Output General-use input/output terminal 5.
29* EMPH/CONT6 Output
30* C2F Output
31 DOUT Output
32* TEST3 Input
33 TEST4 Input
34 PCCL Input
35* MUTEL/CONT7 Output
36 LVDD
37 LCHO Output
38 LVSS
39 RVSS
40 RCHO Output
41 RVDD
42* MUTER/CONT8 Output
43 XVDD
44 XOUT Output
45 XIN Input
46 XVSS
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
Defect detection signal (DFF) input terminal. (When this terminal is not used, connect it to 0V.)
For PLL Input terminal for test. Pull-down resistor built in. Be sure to connect this terminal to 0V.
Phase comparison output terminal for external VCO control.
— Grounding terminal for built-in VCO. Be sure to connect this terminal to 0V.
Resistor connection terminal for adjustment of PDO output current.
— Power terminal for built-in VCO.
For VCO frequency range adjustment.
— Digital system grounding terminal. Be sure to connect this terminal to 0V.
For slice level control EFM signal output terminal.
Input terminal for test. Pull-down resistor built-in. Be sure to connect this terminal to 0V.
Output for disc motor control. 3-value output is enabled according to command.
Output for disc motor control. 3-value output is enabled according to command.
Rough servo/phase control automatic selection monitor output terminal.
"H": Rough servo, "L": Phase servo
Track detection signal input terminal. Schmidt input.
Tracking error signal input terminal. Schmidt input.
Tracking OFF output terminal.
Output terminal for tracking gain selection. "L": Gain raising.
Output for track jump control. 3-value output is enabled according to command.
Output for track jump control. 3-value output is enabled according to command.
Clock monitor terminal for EFM data play-back. Phase lock: 4.3218 MHz.
Sync signal detection output terminal.
When the sync signal detected from the EFM signal coincides with the internally generated sync
signal: "H"
— Digital system power terminal.
Deemphasis monitor terminal. "H": Deemphasis disc play-back. General-use output terminal 6.
C2 flag output terminal.
Digital OUT output terminal. (EIAJ format)
Input terminal for test. Pull-down resistor built-in. Be sure to connect this terminal to 0V.
Input terminal for test. Pull-down resistor built-in. Be sure to connect this terminal to 0V.
General-use input/output command recognition terminal. Pull-down resistor built in.
When this terminal is used for the same function as that of LC78622E, open or connect this
terminal to 0V.
H: Only the general-use input/output port command is controllable.
L: All command controls are enabled.
L channel 1-bit DAC
—
—
— R channel 1-bit DAC
—
— Power terminal for crystal oscillation.
16.9344 MHz crystal oscillator connection terminal.
16.9344 MHz crystal oscillator connection terminal.
— Grounding terminal for crystal oscillation. Be sure to connect this terminal to 0V.
Function
EFM signal input terminal.
Control with serial data command from microcomputer.
When this terminal is not used, set it as an input terminal
and connect to 0V or set it as an output terminal and
open.
Mute output terminal for L channel. General-use output terminal 7.
Power terminal for L channel.
L channel output terminal.
Grounding terminal for L channel. Be sure to connect this terminal to 0V.
Grounding terminal for R channel. Be sure to connect this terminal to 0V.
R channel output terminal.
Power terminal for R channel.
Mute output terminal for R channel. General-use output terminal 8.
– 49 –
CD-C622/C2900