HA12188AF
Pre-Amplifier and Servo IC for Quadruple-Speed CD-ROM
ADE-207-183(Z)
1st. Edition October 1995
Description
The typical values of built-in capacitances in this IC are reduced 10% compared with those in IC HA12188F. The values of Electrical Characteristics of this IC are same as those of IC HA12188F.
Functions
•RF amplifier
•Focus error amplifier
•Tracking error amplifier
•FOK detector
•Mirror detector
•Defect detector
•APC amplifier
•Focus, tracking, and sled servo control
•Inner/outer direction detector
Features
•Built-in variable resistors for adjusting tracking error EF balance, tracking gain, and focus gain
•Single power supply
•Supports double and quadruple speeds
•Few external components
•FP-56 package
HA12188AF
Block Diagram
VCC |
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42 |
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29 |
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RS2 |
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RS1 |
RFS |
Bias |
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Mirror |
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Defect |
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– + |
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– |
FOK |
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28 LDS |
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+ |
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27 CLK |
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+ |
RF1 |
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– |
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26 DATA |
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25 XLT |
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– |
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FE |
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Input |
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RF2 |
+ |
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I/F |
24 DC |
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44 |
– |
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Logic |
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23 XRST |
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+ |
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+ |
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VR |
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22 SENS |
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– |
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APC |
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Output |
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21 COUT |
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46 |
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I/F |
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+ |
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20 DEFECT |
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47 |
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– |
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or DRT |
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+ |
TR1 |
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SLM |
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48 |
– |
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DRIV. |
TR2 BAL |
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TM5 TM6 |
19 |
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+ |
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SSA |
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VR |
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49 |
– |
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+ – |
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50 |
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18 |
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51 |
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VR |
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– |
+ |
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17 |
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TM2 |
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TE |
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+ |
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52 |
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TM3 TM4 |
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53 |
+ |
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THS |
Phase |
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– |
TZC |
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compen. |
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54 |
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TM7 |
TSA |
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FA |
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– |
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– |
FZC |
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+ |
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55 |
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+ |
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– |
+ |
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56 |
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FS4 |
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TPS |
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TM1 |
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DS1 |
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FS2 |
FS1 |
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TLS |
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FLS |
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Phase |
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TAC |
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DS2 |
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compen. |
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FSA |
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DRIV. |
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Focus |
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FPS |
– |
+ |
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bias |
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× |
2.7 |
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× 2.7 |
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15 VCC |
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adj. |
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1 |
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2 |
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14 |
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+ |
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FAC |
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DRIV. |
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•The states of the IC’s internal switches at XRST = “L” are shown at block diagram.
•The black dot symbol of transfer switch shows on state.
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” mean connecting to V . |
• The symbols “ |
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CC |
• The symbols “ |
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” mean connecting to pin 45. |
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Rev.1, Oct. 1995, page 2 of 35
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HA12188AF |
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Pin Descriptions and Equivalent Circuits |
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Pin No. |
Symbol |
Equivalent Circuit |
Function |
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1 |
FH |
470 k |
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Focus error hold signal output |
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3 |
TH |
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Tracking error hold signal output |
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2 |
TSI |
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Tracking servo input |
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56 |
FSI |
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Focus servo input |
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4 |
FLS |
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90 k |
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Focus-servo low-frequency filter |
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resistor & capacitor connection |
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(FLS on) |
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5 |
FLS |
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30 k |
Focus-servo low-frequency filter |
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capacitor connection (FLS off) |
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6 |
SGND |
— |
Servo ground |
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7 |
FPS |
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Resistor connection for programming |
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focus-servo phase compensation |
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(FPS off) |
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8 |
FPS |
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Resistor connection for programming |
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focus-servo phase compensation |
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(FPS on) |
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9 |
FSA |
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Focus servo output |
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20 k
10 |
FS1 |
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FS1 voltage output |
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20 k |
11 |
TLS |
33 k |
Tracking servo low-frequency filter |
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capacitor connection (TLS off) |
Rev.1, Oct. 1995, page 3 of 35
HA12188AF
Pin Descriptions and Equivalent Circuits (cont)
Pin No. |
Symbol |
Equivalent Circuit |
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Function |
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12 |
TLS |
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100 k |
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Tracking servo low-frequency filter |
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resistor & capacitor connection |
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(TLS on) |
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13 |
TPS |
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Resistor connection for programming |
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tracking servo phase compensation |
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(TPS off) |
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14 |
TPS |
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Resistor connection for programming |
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tracking servo phase compensation |
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(TPS on) |
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15 |
SVCC |
— |
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Servo power supply |
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16 |
TSA |
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Tracking servo output |
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22 k
17 |
TM2 |
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Sled servo input |
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18 |
SSM |
SSA amplifier inverting input |
19 |
SSA |
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Sled servo output |
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Rev.1, Oct. 1995, page 4 of 35
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HA12188AF |
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Pin Descriptions and Equivalent Circuits (cont) |
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Pin No. |
Symbol |
Equivalent Circuit |
Function |
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20 |
DRT |
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VCC |
Defect signal output or inner/outer |
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10 k |
direction signal output |
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21 |
COUT |
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COUT output |
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22 |
SENS |
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SENS output |
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23 |
XRST |
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Reset input |
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24 |
DC |
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DC input |
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25 |
XLT |
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XLT input |
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26 |
DATA |
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Data input |
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27 |
CLK |
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Clock input |
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28 |
LDS |
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50 k |
Laser switch input |
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50 k |
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29 |
DFIN |
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43 k |
Defect comparator input |
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30 |
DFO |
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Defect envelope signal output |
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31 |
DFH |
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Defect hold signal output |
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Rev.1, Oct. 1995, page 5 of 35
HA12188AF
Pin Descriptions and Equivalent Circuits (cont)
Pin No. |
Symbol |
Equivalent Circuit |
Function |
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32 |
FOK |
VCC |
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FOK comparator output |
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20 k |
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33 |
MIRH |
Mirror hold signal output |
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100 k |
34 |
RFA |
40 k |
RF signal AC input |
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18 k |
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35 |
BYPS |
20 k |
Capacitor connection for ripple filter |
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36 |
ISET |
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Resistor connection for programming |
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reference current |
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37 |
PGND |
— |
Pre-amplifier ground |
38 |
RFO |
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RF signal output |
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18 k |
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40 k |
39 |
RS1 |
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RS1 switch |
Rev.1, Oct. 1995, page 6 of 35
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HA12188AF |
Pin Descriptions and Equivalent Circuits (cont) |
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Pin No. |
Symbol |
Equivalent Circuit |
Function |
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40 |
RS2 |
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RS2 switch |
41 |
RFM |
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RFS amplifier inverting input |
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5 k |
5 k |
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42 |
PVCC |
— |
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Pre-amplifier power supply |
43 |
RF1 |
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RF1 amplifier input |
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10 k |
44 |
RF2 |
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RF2 amplifier input |
45 |
VC |
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Voltage reference output |
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20 k |
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46 |
MD |
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APC amplifier input |
47 |
LD |
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APC amplifier output |
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150 k |
1 k |
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48 |
TR1 |
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TR1 amplifier input |
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80 k |
3.6 p |
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32 k |
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20 k |
16 k |
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49 |
TR2 |
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TR2 amplifier input |
Rev.1, Oct. 1995, page 7 of 35
HA12188AF
Pin Descriptions and Equivalent Circuits (cont)
Pin No. |
Symbol Equivalent Circuit |
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Function |
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50 |
TEP |
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TE amplifier non-inverting input |
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22.6 k |
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51 |
TEM |
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TE amplifier inverting input |
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52 |
TEO |
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TE amplifier output |
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53 |
TZC |
TZC comparator input |
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75 k |
54 |
FAM |
FA amplifier inverting input |
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5.5 k |
55 |
FAO |
FA amplifier output |
Rev.1, Oct. 1995, page 8 of 35
HA12188AF
Operation
1. Microprocessor Control
The IC’s internal switches can be operated by sending control data from a microprocessor. The signal timing is shown in figure 1, and the control commands are listed in table 1.
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DATA |
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
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T1 |
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T2 |
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CLK |
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XLT |
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T3 |
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T4 |
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Item |
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Symbol |
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Min |
Typ |
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Max |
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Unit |
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Clock frequency |
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fCLK |
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— |
— |
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520 |
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kHz |
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Clock pulse width |
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T1, T2 |
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0.96 |
— |
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— |
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s |
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Delay time |
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T3 |
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1 |
— |
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— |
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s |
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Latch pulse width |
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T4 |
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2 |
— |
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— |
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s |
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Figure 1 Timing Diagram for Microprocessor Control
Signals from the microprocessor are input at pins 23 to 27. A low input at the XRST pin resets the IC. Normally this pin should be kept high. (See figure 2.)
27 CLK
26 DATA
Input 25 XLT
I/F 24 DC
Logic
23 XRST
22 SENS
Output
21 COUT
I/F
20 DEFECT or DRT
Figure 2 Microprocessor Interface
Rev.1, Oct. 1995, page 9 of 35
HA12188AF
Table 1 Microprocessor Control Commands
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DATA *1 |
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SENS |
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D7D6D5D4 |
D3 |
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D2 |
D1 |
D0 |
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Focus mode |
0 |
0 |
0 |
0 |
FS4 |
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*2 |
FS2 |
FS1 |
FZC |
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DEFECT |
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OFF |
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Tracking mode and FS1 |
0 |
0 |
0 |
1 |
DRT |
*3 |
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TM7 *4 |
FS1 current |
THS |
H |
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0: Defect |
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*5 |
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DRT setting |
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1: Direction |
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Access control mode |
0 |
0 |
1 |
0 |
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See table 2 |
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TZC |
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TM3, TM4 current *6 |
TM5, TM6 current *6 |
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D3 D2 Current value |
D1 D0 Current value |
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Pulse setting mode |
0 |
0 |
1 |
1 |
0 |
0 |
32 A |
0 |
0 |
32 A |
H |
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0 |
1 |
16 A |
0 |
1 |
16 A |
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1 |
0 |
24 A |
1 |
0 |
24 A |
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1 |
1 |
8 |
A |
1 |
1 |
8 A |
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Mirror |
*7 |
Focus |
RF |
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tracking |
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Speed setting mode |
0 |
1 |
0 |
0 |
D3 D2 |
Mode |
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0 |
0 |
Normal |
FLS FPS |
RS1 RS2 |
H |
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0 |
1 |
Double |
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1 |
1 |
Quadruple |
TLS TPS |
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EF balance adjustment |
0 |
1 |
0 |
1 |
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BAL2 |
BAL1 |
BAL0 |
H |
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0 ; Focus |
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GF2 |
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GF0 |
H |
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Tracking gain and focus |
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gain |
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0 |
1 |
1 |
0 |
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gain adjustment |
1 ; Tracking |
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GT2 |
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GT0 |
H |
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gain |
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Notes: 1. The switch name surrounded by circle means that the switch turns on when the corresponding bit is “1”. The switch name with bar surrounded by circle means that the switch turns on when the corresponding bit is “0”.
2.“DEFECT OFF” means that switches DS1 and DS2 don’t turn on when the corresponding bit is “1”. Though the “DEFECT OFF” bit is set, the output at pin 20 is defect signal (in defect signal output mode).
3.DRT (pin 20) outputs defect signal when the corresponding bit is “0”, and outputs direction signal when the corresponding bit is “1”.
4.TM7 can turn on only when COUT is high.
5.The value of two current sources over switch FS1 are 18 A(source) 36 A(sink) when the corresponding bit is “1”, and are 9 A(source) 18 A(sink) when the corresponding bit is “0”.
6.The current values through switches TM3, TM4, TM5 and TM6 can be selected in four steps.
7.The speed of Mirror circuit can be selected in three steps. Don’t use D3 = “1”, D2 = “0” mode.
Rev.1, Oct. 1995, page 10 of 35
HA12188AF
Table 2 Access Control Mode
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DATA |
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ST1 |
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ST2 |
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ST3 |
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D3 |
D2 |
D1 |
D0 TM6 TM5 TM4 TM3 TM2 TM1 TM6 TM5 TM4 TM3 TM2 TM1 TM6 TM5 TM4 TM3 TM2 TM1 |
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$20 |
0 |
0 |
0 |
0 |
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$21 |
0 |
0 |
0 |
1 |
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$22 |
0 |
0 |
1 |
0 |
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$23 |
0 |
0 |
1 |
1 |
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$24 |
0 |
1 |
0 |
0 |
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$25 |
0 |
1 |
0 |
1 |
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$26 |
0 |
1 |
1 |
0 |
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$27 |
0 |
1 |
1 |
1 |
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$28 |
1 |
0 |
0 |
0 |
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$29 |
1 |
0 |
0 |
1 |
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$2A |
1 |
0 |
1 |
0 |
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$2B |
1 |
0 |
1 |
1 |
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$2C |
1 |
1 |
0 |
0 |
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$2D |
1 |
1 |
0 |
1 |
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$2E |
1 |
1 |
1 |
0 |
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$2F |
1 |
1 |
1 |
1 |
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A circle means that the switch is ON.
Note: After the microprocessor sends serial data, TM1 to TM6 can be switched among the states listed under ST1 to ST3 by input at the DC pin. First, if the microprocessor sends serial data when DC is high, TM1 to TM6 are placed in the state listed under ST1. When DC is brought low, the states change to the states listed under ST2. Then if DC is brought high again, the states change to the states listed under ST3.
Rev.1, Oct. 1995, page 11 of 35