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Global Mixed-mode Technology Inc.

G569C

CD-RW Laser Diode Current Driver

Features

Single +5V supply

Laser diode read current driver

Laser diode write current driver

Laser diode Erase current driver

Deltap circuit to control write current

FSA circuit to integrate photo diode current

Cagain circuit to convert V

cagain

into current

Dalpha circuit to perform voltage subtraction

and limiting

3-wire interface to control internal DAC

A build-in OP-AMP

48-pin SSOP package

General Description

The G569C is a single chip solution for the various

functions relating to laser diode operation in a CD-RW

drive. The G569C integrates nine functional blocks in

one chip. It has five voltage-to-current converters, one

current-to-voltage converters which is called FSA, one

OP-AMP, one eight-channels D/A converter, and one

voltage subtracter with output clamping capability

called Dalpha.

Three of the five V-to-I converters provide the laser

diode currents for Read, Write, and Erase operations,

respectively; another one of the V-I converters

provides the Cagain current; and the other one

provides Deltap current which can selectively shunt a

certain amount of laser diode current for write

operation. For the Write and Erase operations, the

voltage to current conversion ratio can be adjusted

using an external or internal DAC resistor array. The

FSA circuit performs integration on the output current

of an external photo diode, and sample-and-hold the

peak voltage. It is used to monitor the laser diode

power. The internal eight-channel D/A converter is

used to provide the input voltage for above functional

blocks. The G569C is available in a 48-pin SSOP

surface-mount package.

Applications

CD-RW Drive

Pin configuration

G569C

IW_IN

LS_DELTA

TST1

PWO

DALPHA

PWO_I

PWB

PWMAX

PWMIN

/RESET

VSS

EDB

LS_ERASE

PERASE

RECORD

CDR

S2V9

CAGAIN2

CAGS_I

DCAGAIN

CAGAIN

RCAGAIN1

RCAGAIN2

PRFINE

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

48

47

46

45

44

43

42

41

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

WDB

LS_WRITE

PWRITE

LD

DI

CLK

VSS

VOUT

VI-

VI+

VDD

FSOF

FSWS

FSCLR

FSW

IFSA

FSR

FSRS

VDD

SELN4_IN

PR_I

LS_READ

IR

PRCOARSE

Ordering Information

ORDER ORDER NUMBER

NUMBER

(Pb free)

G569CS8U

G569CS8Uf

Note: S8: SSOP-48

U: Tape & Reel

TEMP.

RANGE

0擄C to 85擄C

PACKAGE

SSOP-48

SSOP-48

Ver: 1.0

Oct 02, 2000

TEL: 886-3-5788833

http://www.gmt.com.tw

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G569CS8U相關(guān)型號(hào)PDF文件下載

• 型號(hào)
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  描述
  廠商
  下載
• G569C
  英文版
  CD-RW Laser Diode Current Driver
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• G569C
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• G569CS8U
  英文版
  CD-RW Laser Diode Current Driver
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• G569CS8UF
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