SAA7824 Datasheet, PDF (64/89 Pages) NXP Semiconductors – CD audio decoder, digital servo and filterless DAC with integrated pre-amp and laser control (PhonIC)

Philips Semiconductors
CD audio decoder, digital servo and filterless
DAC with integrated pre-amp and laser control
Product specification
SAA7824
Table 46 brake_dist_max parameter: maximum sledge
distance allowed in fast actuator steered mode;
RAM address 21H
brake_dist_max value
(decimal)
0...127
−1
−2
....
−i
....
−127
−128
Maximum sledge
distance allowed in fast
actuator steered mode,
number of tracks
not allowed
1 × 16
2 × 16
....
i × 16
....
127 × 16
128 × 16
Table 47 sledge_Umax parameter: voltage on sledge
during long jump
sledge_Umax (decimal)
127
i
0
−1
−i
−128
voltage on sledge
255/256 × V_DD
(i + 128)/256 × V_DD
0.5 × V_DD
(128 − 1)/256 × V_DD
(−i + 128)/256 × V_DD
0
Table 48 sledge_level parameter: voltage on sledge
when steered
sledge_level (decimal)
127
i
0
−1
−i
−128
voltage on sledge
127/256 × V_DD
i/256 × V_DD
0
−1/256 × V_DD
−i/256 × V_DD
−128/256 × V_DD
Table 49 jumpwatchtime parameter: radial jump
watchdog readout time difference; RAM
address 57H
jumpwatchtime
80H to FFH
0H
1H
i
7FH
Radial jump watchdog
readout time difference
ms
none
0
0.25
i × 0.25
32
Table 50 playwatchtime parameter: radial play watchdog
maximum time-out; RAM address 54H
playwatchtime
80H
81H
82H
i
00H
j
7fH
Radial play watchdog
maximum time-out ms
0
0.5
1
(i − 80H) × 0.5
64
(j + 80H) × 0.5
128
Table 51 radcontrol parameter: automatic radial servo
switch-off control; RAM address 59H
radcontrol
0000 0000
0100 0000
0010 0000
0110 0000
Automatic
Hex
radial servo
switch-off
control
00
radial servo not
influenced by
watchdog
40
switch-off radial
servo on jump
error; no action
on play error
20
switch-off radial
servo on play
error; no action
on jump error
60
switch-off radial
servo on play or
jump error
2003 Oct 01
64