SAA7824 Datasheet, PDF (56/89 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
7.17.7 SUMMARY OF SERVO COMMAND PARAMETERS
Table 27 Servo command parameters
PARAMETER
foc_parm_1
RAM
ADDRESS
−
AFFECTS
focus PID
foc_parm_2
−
focus PID
foc_parm_3
−
focus PID
foc_int
foc_gain
CA_drop
ramp_offset
ramp_height
ramp_incr
FE_start
rad_parm_play
rad_pole_noise
rad_length_lead
rad_int
rad_gain
rad_parm_jump
vel_parm1
vel_parm2
speed_threshold
hold_mult
14H
15H
12H
16H
18H
−
19H
28H
29H
1CH
1EH
2AH
27H
1FH
32H
48H
49H
focus PID
focus PID
focus PID
focus ramp
focus ramp
focus ramp
focus ramp
radial PID
radial PID
radial PID
radial PID
radial PID
radial jump
radial jump
radial jump
radial jump
radial jump
brake_dist_max
sledge_long_brake
sledge_Umax
sledge_level
sledge_parm_1
sledge_parm_2
21H
radial jump
58H
radial jump
−
sledge
−
sledge
36H
sledge
17H
sledge
sledge_pulse1
sledge_pulse2
defect_parm
playwatchtime
jumpwatchtime
46H
pulsed sledge
64H
pulsed sledge
−
defect detector
54H
Watchdog
57H
Watchdog
POR VALUE
DETERMINES
−
end of focus lead
defect detector enabling
−
focus low-pass
focus error normalizing
−
focus lead length
minimum light level
−
focus integrator crossover frequency
70H
focus PID loop gain
−
sensitivity of dropout detector
−
asymmetry of focus ramp
−
peak-to-peak value of ramp voltage
−
slope of ramp voltage
−
minimum value of focus error
−
end of radial lead
−
radial low-pass
−
length of radial lead
−
radial integrator crossover frequency
70H
radial loop gain
−
filter during jump
−
PI controller crossover frequencies
−
jump pre-defined profile
−
maximum speed in fastrad mode
00H
electronic damping
sledge bandwidth during jump
−
maximum sledge distance allowed in
fast actuator steered mode
FFH
brake distance of sledge
−
voltage on sledge during long jump
−
voltage on sledge when steered
−
sledge integrator crossover frequency
−
sledge low-pass frequencies
sledge gain
sledge operation mode
−
pulse width
−
pulse height
−
defect detector setting
−
radial on-track Watchdog time
−
radial jump Watchdog time-out
2003 Oct 01
56