SAA7824 datasheet(64/89 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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64 / 89 page

2003 Oct 01

64

Philips Semiconductors

Product speciﬁcation

CD audio decoder, digital servo and ﬁlterless

DAC with integrated pre-amp and laser control

SAA7824

Table 46 brake_dist_max parameter: maximum sledge

distance allowed in fast actuator steered mode;

RAM address 21H

Table 47 sledge_Umax parameter: voltage on sledge

during long jump

Table 48 sledge_level parameter: voltage on sledge

when steered

Table 49 jumpwatchtime parameter: radial jump

watchdog readout time difference; RAM

address 57H

Table 50 playwatchtime parameter: radial play watchdog

maximum time-out; RAM address 54H

Table 51 radcontrol parameter: automatic radial servo

switch-off control; RAM address 59H

brake_dist_max value

(decimal)

Maximum sledge

distance allowed in fast

actuator steered mode,

number of tracks

0...127

not allowed

−11 × 16

−22 × 16

....

−ii × 16

....

−127

127

× 16

−128

128

× 16

sledge_Umax (decimal)

voltage on sledge

127

255/256

× V

DD

i

(i + 128)/256

× VDD

0

0.5

× VDD

−1

(128

− 1)/256 × VDD

−i(−i + 128)/256 × VDD

−128

0

sledge_level (decimal)

voltage on sledge

127

127/256

× V

DD

i

i/256

× VDD

00

−1

−1/256 × V

DD

−i

−i/256 × VDD

−128

−128/256 × VDD

jumpwatchtime

Radial jump watchdog

readout time difference

ms

80H to FFH

none

0H

0

1H

0.25

ii

× 0.25

7FH

32

playwatchtime

Radial play watchdog

maximum time-out ms

80H

0

81H

0.5

82H

1

i(i

− 80H) × 0.5

00H

64

j

(j + 80H)

× 0.5

7fH

128

radcontrol

Hex

Automatic

radial servo

switch-off

control

0000 0000

00

radial servo not

inﬂuenced by

watchdog

0100 0000

40

switch-off radial

servo on jump

error; no action

on play error

0010 0000

20

switch-off radial

servo on play

error; no action

on jump error

0110 0000

60

switch-off radial

servo on play or

jump error

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