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 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

42

41

40

39

38

37

36

35

34

33

32

31

30

29

RS2

RS1

RFS

Bias

Mirror

Defect

– +

–

FOK

28 LDS

+

27 CLK

+

RF1

–

26 DATA

+

25 XLT

43

–

FE

Input

RF2

+

I/F

24 DC

44

–

Logic

23 XRST

45

+

+

VR

22 SENS

–

APC

Output

21 COUT

46

I/F

+

20 DEFECT

47

–

or DRT

+

TR1

SLM

48

–

DRIV.

TR2 BAL

TM5 TM6

19

+

SSA

VR

49

–

+ –

50

18

51

VR

–

+

17

TM2

TE

+

52

TM3 TM4

53

+

THS

Phase

–

TZC

compen.

54

TM7

TSA

FA

–

–

FZC

+

55

+

–

+

56

FS4

TPS

TM1

16

DS1

FS2

FS1

TLS

FLS

Phase

TAC

DS2

compen.

FSA

DRIV.

Focus

FPS

–

+

bias

×

2.7

× 2.7

15 VCC

adj.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

+

FAC

DRIV.

•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.

			” mean connecting to V .
• The symbols “
			CC
• The symbols “			” mean connecting to pin 45.

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

HA12188AF

Pin Descriptions and Equivalent Circuits

Pin No.

Symbol

Equivalent Circuit

Function

1

FH

470 k

Focus error hold signal output

3

TH

Tracking error hold signal output

2

TSI

Tracking servo input

56

FSI

Focus servo input

4

FLS

90 k

Focus-servo low-frequency filter

resistor & capacitor connection

(FLS on)

5

FLS

30 k

Focus-servo low-frequency filter

capacitor connection (FLS off)

6

SGND

—

Servo ground

7

FPS

Resistor connection for programming

focus-servo phase compensation

(FPS off)

8

FPS

Resistor connection for programming

focus-servo phase compensation

(FPS on)

9

FSA

Focus servo output

20 k

10	FS1					FS1 voltage output

			20 k
11	TLS	33 k	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		100 k							Tracking servo low-frequency filter
										resistor & capacitor connection
										(TLS on)
13	TPS									Resistor connection for programming
										tracking servo phase compensation
										(TPS off)
14	TPS									Resistor connection for programming
										tracking servo phase compensation
										(TPS on)
15	SVCC	—								Servo power supply
16	TSA									Tracking servo output

22 k

17	TM2				Sled servo input

18

SSM

SSA amplifier inverting input

19	SSA						Sled servo output

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

						HA12188AF
	Pin Descriptions and Equivalent Circuits (cont)
	Pin No.	Symbol	Equivalent Circuit			Function
	20	DRT			VCC	Defect signal output or inner/outer
				10 k		direction signal output

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				50 k				Laser switch input
						50 k
29	DFIN					43 k			Defect comparator input
30	DFO								Defect envelope signal output

31	DFH			Defect hold signal output

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

HA12188AF

Pin Descriptions and Equivalent Circuits (cont)

Pin No.	Symbol	Equivalent Circuit				Function
32	FOK	VCC				FOK comparator output
				20 k

33

MIRH

Mirror hold signal output

			100 k
34	RFA	40 k	RF signal AC input
		18 k
35	BYPS	20 k	Capacitor connection for ripple filter

36	ISET		Resistor connection for programming
			reference current

37	PGND	—	Pre-amplifier ground
38	RFO		RF signal output
			18 k
			40 k
39	RS1		RS1 switch

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

				HA12188AF
Pin Descriptions and Equivalent Circuits (cont)
Pin No.	Symbol	Equivalent Circuit		Function
40	RS2			RS2 switch
41	RFM			RFS amplifier inverting input
		5 k	5 k
42	PVCC	—		Pre-amplifier power supply
43	RF1			RF1 amplifier input
				10 k
44	RF2			RF2 amplifier input
45	VC			Voltage reference output
			20 k
46	MD			APC amplifier input
47	LD			APC amplifier output
		150 k		1 k
48	TR1			TR1 amplifier input
			80 k	3.6 p
				32 k
		20 k	16 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					TE amplifier non-inverting input
				22.6 k
51	TEM					TE amplifier inverting input
52	TEO					TE amplifier output

53	TZC	TZC comparator input
		75 k
54	FAM	FA amplifier inverting input
		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.

	DATA		0			1	2	3	4	5	6	7
		T1				T2
	CLK
	XLT											T3					T4
	Item					Symbol			Min	Typ		Max				Unit
	Clock frequency					fCLK			—	—		520				kHz
	Clock pulse width					T1, T2			0.96	—		—				s
	Delay time					T3			1	—		—				s
	Latch pulse width					T4			2	—		—				s

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

								DATA *1					SENS
		D7D6D5D4				D3			D2	D1		D0
	Focus mode	0	0	0	0	FS4			*2	FS2		FS1	FZC
								DEFECT
								OFF
	Tracking mode and FS1	0	0	0	1	DRT	*3		TM7 *4	FS1 current		THS	H
						0: Defect					*5
	DRT setting					1: Direction
	Access control mode	0	0	1	0				See table 2				TZC
						TM3, TM4 current *6				TM5, TM6 current *6
						D3 D2 Current value				D1 D0 Current value
	Pulse setting mode	0	0	1	1	0	0	32 A		0	0	32 A	H
						0	1	16 A		0	1	16 A
						1	0	24 A		1	0	24 A
						1	1	8	A	1	1	8 A
								Mirror	*7	Focus		RF
										tracking
	Speed setting mode	0	1	0	0	D3 D2		Mode
						0	0	Normal		FLS FPS		RS1 RS2	H
						0	1	Double
						1	1	Quadruple		TLS TPS
	EF balance adjustment	0	1	0	1				BAL2	BAL1		BAL0	H
						0 ; Focus			GF2			GF0	H
	Tracking gain and focus					gain
		0	1	1	0
	gain adjustment					1 ; Tracking
									GT2			GT0	H
						gain

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

		DATA				ST1		ST2		ST3
	D3	D2	D1	D0 TM6 TM5 TM4 TM3 TM2 TM1 TM6 TM5 TM4 TM3 TM2 TM1 TM6 TM5 TM4 TM3 TM2 TM1
$20	0	0	0	0
$21	0	0	0	1
$22	0	0	1	0
$23	0	0	1	1
$24	0	1	0	0
$25	0	1	0	1
$26	0	1	1	0
$27	0	1	1	1
$28	1	0	0	0
$29	1	0	0	1
$2A	1	0	1	0
$2B	1	0	1	1
$2C	1	1	0	0
$2D	1	1	0	1
$2E	1	1	1	0
$2F	1	1	1	1

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