1998 Oct 30

13

Philips Semiconductors

Product specification

Data amplifier and laser supply circuit for CD

audio and video optical systems (ADALAS)

TZA1024

The application for the TZA1024 (ADALAS) with the SAA7324 (CD10) without a coupling capacitor is shown in Fig.9.

Fig.9 Application diagram with SAA7324 (CD10) without coupling capacitor.

(1) See Equation (3) to calculate the value of this resistor.

(2) Pins EQSEL and CDRW can be controlled by the CD10 or a microprocessor but can also be fixed or switched by any other means.

(3) The 10 k

Ω feedback resistor between pins 9 and 10 is a fixed value.

(4) For recommended values per speed see Table 1.

(5) The high-pass filter (AC-coupling) is placed at the input of the preamplifier. The

−3 dB point (f = 10 kHz) is at

R2

Ω

() C2 F

()

×

4

---------------------------------------------

MGR524

handbook, full pagewidth

10 nF

100 nF

100 nF

100 nF

100 nF

TZA1024

(ADALAS)

SAA7324

(CD10)

OPU

1

2

3

4

5

6

7

8

14

13

12

11

10

9

LD

VDD(L)

CFIL

MON

DIN

GND

PWRON

CMFB

RFFB

RFEQO

CDRW

EQSEL

VDD

RGADJ

RRGADJ

(1)

from

LD

D1

D2

D3

D4

S1

S2

D1

D2

D3

D4

S1

S2

MON

VCOM

HFIN

HFREF

ISLICE

LDON

VRIN

10 k

1 k

Ω

VDD(LASER)

VDD

R2 (4

×)

VDD

(6)

LF FILTER

6

× 220 pF