SAA7824 datasheet(25/89 Pages) PHILIPS

Part #	SAA7824

Description	CD audio decoder, digital servo and filterless DAC with integrated pre-amp and laser control (PhonIC)

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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25 / 89 page

2003 Oct 01

25

Philips Semiconductors

Product speciﬁcation

CD audio decoder, digital servo and ﬁlterless

DAC with integrated pre-amp and laser control

SAA7824

Table 11 Pin applications

NAME

NUMBER

TYPE

REGISTER

ADDRESS

REGISTER

DATA

FUNCTION

V1

71

input

1100

XXX1

external off-track signal input

−

XXX0

internal off-track signal used input may be read

via decoder status bit; selected via register 2

V2

72

input

−−

input may be read via decoder status bit;

selected via register 2

V3

73

output

1100

00XX

output = 0

−

01XX

output = 1

V4

74

output

1101

0000

4-line motor drive (using V4 and V5)

−

XX01

Q-to-W subcode output

−

XX10

output = 0

−

XX11

output = 1

V5

75

output

1101

01XX

de-emphasis output (active HIGH)

−

10XX

output = 0

−

11XX

output = 1

7.15

Spindle motor control

7.15.1

MOTOR OUTPUT MODES

The spindle motor speed is controlled by a fully integrated

digital servo. Address information from the internal

±8

frame FIFO and disc speed information are used to

calculate the motor control output signals. Several output

modes, selected by decoder register 6, are supported:

• Pulse density, 2-line (true complement output),

(1

× n) MHz sample frequency

• PWM output, 2-line, (22.05 × n) kHz modulation

frequency

• PWM output, 4-line, (22.05 × n) kHz modulation

frequency

• CDV motor mode.

7.15.1.1

Pulse density output mode

In the pulse density mode the motor output pin (MOTO1)

is the pulse density modulated motor output signal.

A 50% duty factor corresponds with the motor not

actuated, higher duty factors mean acceleration, lower

duty factors means braking. In this mode, the MOTO2

signal is the inverse of the MOTO1 signal. Both signals

change state only on the edges of a (1

× n) MHz internal

clock signal.

7.15.1.2

PWM output mode (2-line)

In the PWM mode the motor acceleration signal is put in

pulse-width modulation form on the MOTO1 output. The

motor braking signal is pulse-width modulated on the

MOTO2 output. The timing is illustrated in Fig 16. A typical

application diagram is illustrated in Fig 17.

rep

t

= 45

µs

t

240 ns

dead

Accelerate

Brake

MOTO1

MOTO2

MGA366

Fig.16 2-line PWM mode timing.

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