HIT HA12188AF Datasheet

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 I C 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 g ain

• Single power supply

• Supports double and quadruple speeds

• Few external components

• FP-56 package

HA12188AF

Block Diagram

V

CC

40

RFS

RS2

RF1

+ –

43

RF2

+ –

44 45

+

APC

46 47

48

TR2

49

+ –

BAL

TR1

+ –

VR

RS1

–+

– +

FE

+ –

VR

50 51

VR

–+

TE

52

+

53

–

FA

TZC

– +

FS4

FZC

– +

54

55

56

DS1

FLS

Phase

compen.

×2.7

FPS

Focus bias adj.

DS2

1 2 5 6

3 4 7 8 9

• 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.

• The symbols “ ” mean connecting to V

• The symbols “ ” mean connecting to pin 45.

CC

FS2

.

Bias

35363738394142

FS1

FSA

–+

FAC DRIV.

TM1

11 1210 13 14

+

Mirror

THS

– +

FOK

TLS

Logic

Phase

compen.

×2.7

3134 32 30 2933

Defect

TM5 TM6

TM7

TPS

Input

I/F

Output

I/F

TM2

TM3 TM4

–+

TSA

–+

SSA

28 27 26 25

24 23

22 21 20

19

18

17

16

15

TAC DRIV.

LDS CLK DATA XLT

DC XRST

SENS COUT DEFECT

or DRT

SLM DRIV.

+

V

CC

Rev.1, Oct. 1995, page 2 of 35

HA12188AF

Pin Descriptions and Equivalent Circuits

Pin No. Symbol Equivalent Circuit Function

1FH

3 TH Tracking error hold signal output 2TSI Tracking servo input

56 FSI Focus servo input 4FLS

5 FLS

6 SGND — Servo ground 7 FPS Resistor connection for programming

470 k

90 k

30 k

Focus error hold signal output

Focus-servo low-frequency filter resistor & capacitor connection (FLS on)

Focus-servo low-frequency filter capacitor connection (FLS off)

focus-servo phase compensation (FPS off)

8 FPS Resistor connection for programming

focus-servo phase compensation (FPS on)

9FSA

10 FS1

11 TLS

20 k

33 k

Focus servo output

FS1 voltage output

Tracking servo low-frequency filter capacitor connection (TLS off)

Rev.1, Oct. 1995, page 3 of 35

HA12188AF

Pin Descriptions and Equivalent Circuits (cont)

Pin No. Symbol Equivalent Circuit Function

12 TLS

13 TPS Resistor connection for programming

14 TPS Resistor connection for programming

15 SV 16 TSA

CC

— Servo power supply

100 k

22 k

Tracking servo low-frequency filter resistor & capacitor connection (TLS on)

tracking servo phase compensat ion (TPS off)

tracking servo phase compensat ion (TPS on)

Tracking servo output

17 TM2 Sled serv o input

18 SSM SSA amplifier inverting input

19 SSA Sled servo output

Rev.1, Oct. 1995, page 4 of 35

Pin Descriptions and Equivalent Circuits (cont)

Pin No. Symbol Equivalent Circuit Function

20 DRT

21 COUT COUT output 22 SENS SENS output 23 XRST Reset input

24 DC DC input 25 XLT XLT input 26 DATA Data input 27 CLK Clock input 28 LDS

10 k

50 k

V

CC

Defect signal output or inner/outer direction signal output

Laser switch input

HA12188AF

50 k

29 DFIN

30 DFO Defect envelope signal output

31 DFH Defect hold signal output

43 k

Defect comparator input

Rev.1, Oct. 1995, page 5 of 35

HA12188AF

Pin Descriptions and Equivalent Circuits (cont)

Pin No. Symbol Equivalent Circuit Function

32 FOK

V

CC

20 k

FOK comparator output

33 MIRH

100 k

34 RFA

35 BYPS

36 ISET Resistor connection for programming

37 PGND — Pre-amplifier ground 38 RFO

40 k

18 k

20 k

18 k

Mirror hold signal output

RF signal AC input

Capacitor connection for ripple filter

reference current

RF signal output

40 k

39 RS1 RS1 switch

Rev.1, Oct. 1995, page 6 of 35

Pin Descriptions and Equivalent Circuits (cont)

Pin No. Symbol Equivalent Circuit Function

40 RS2

RS2 switch

HA12188AF

41 RFM

42 PV 43 RF1

5 k 5 k

CC

— Pre-amplifier power supply

10 k

RFS amplifier inverting input

RF1 amplifier input

44 RF2 RF2 amplifier input 45 V

C

20 k

Voltage reference output

46 MD APC amplifier input

47 LD

APC amplifier output

48 TR1

20 k

150 k

80 k

16 k

1 k

TR1 amplifier input

3.6 p

32 k

49 TR2 TR2 amplifier input

Rev.1, Oct. 1995, page 7 of 35

HA12188AF

Pin Descriptions and Equivalent Circuits (cont)

Pin No. Symbol Equivalent Circuit Function

50 TEP

51 TEM TE amplifier inverting input 52 TEO TE amplifier output

22.6 k

TE amplifier non-inverting input

53 TZC

75 k

54 FAM

55 FAO FA amplifier output

5.5 k

TZC comparator input

FA amplifier inverting input

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.

DATA

CLK

XLT

Item

Clock frequency Clock pulse width Delay time Latch pulse width

01234567

T1

T2

Symbol

f

CLK

T1, T2 T3 T4

Min

—

0.96 1 2

Typ

— — — —

T3

Max

520

— — —

T4

Unit

kHz

µs µs µs

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

25

Input

I/F

Logic

Output

I/F

XLT

24

DC

23

XRST

22

SENS

21

COUT

20

DEFECT or DRT

Figure 2 Microprocessor Interface

Rev.1, Oct. 1995, page 9 of 35

HA12188AF

Table 1 Microprocessor Control Commands

D7D6D5D4 D3 D2 D1 D0

Focus mode

Tracking mode and FS1 DRT setting

0000

0001

FS4

*3

DRT 0: Defect 1: Direction

*1

DATA

DEFECT OFF

*2

*4

TM7 THS H

FS2 FS1 FZC

FS1 current

*5

SENS

Access control mode

Pulse setting mode

Speed setting mode

EF balance adjustment

Tracking gain and focus gain adjustment

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”. “DEFECT OFF” means that switches DS1 and DS2 don’t turn on when the corresponding bit

2. is “1”. Though the “DEFECT OFF” bit is set, the output at pin 20 is defect signal (in defect signal output mode). DRT (pin 20) outputs defect signal when the corresponding bit is “0”, and outputs direction

3. signal when the corresponding bit is “1”. TM7 can turn on only when COUT is high.

4. The value of two current sources over switch FS1 are 18 µA(source) 36 µA(sink) when the

5. corresponding bit is “1”, and are 9 µA(source) 18 µA(sink) when the corresponding bit is “0”. The current values through switches TM3, TM4, TM5 and TM6 can be selected in four steps.

6. The speed of Mirror circuit can be selected in three steps. Don’t use D3 = “1”, D2 = “0” mode.

7.

0010

0011

0100

0101

0110

D3

0 ;

1 ; Tracking

D2 0 0 1 1

D2 0 0 1

Focus gain

gain

0 1 0 1

0 1 1

Current value

Mirror

See table 2

*6 *6

32µA 16µA 24µA

8µA

*7

Mode Normal Double

Quadruple

BAL2 BAL1 BAL0 H

GF2 GF0 H

GT2 GT0

TM5, TM6 currentTM3, TM4 current

D1

D0

0

1

0

1

Focus

tracking

FLS FPS TLS TPS

Current value

32µA 16µA 24µA

8µA

RF

RS1 RS2

TZC

H

Rev.1, Oct. 1995, page 10 of 35

Table 2 Access Control Mode

HA12188AF

ST3

$20 $21 $22 $23 $24 $25 $26 $27 $28 $29 $2A $2B $2C $2D $2E $2F

DATA ST1 ST2

D3

D2

D1

D0

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

TM5 TM4 TM3 TM2 TM1 TM6 TM5 TM4 TM3 TM2 TM1 TM6 TM5 TM4 TM3 TM2 TM1

TM6

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