SAA7824 Datasheet, PDF (66/89 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 55 defect_parm parameter: defect detector control
defect_parm
xxxx xx00
xxxx xx01
xxxx xx10
xxxx xx11
defect_parm
xxxx 10xx
xxxx 11xx
xxxx 00xx
xxxx 01xx
defect_parm
xx00 xxxx
xx01 xxxx
xx10 xxxx
xx11 xxxx
defect_parm
00xx xxxx
01xx xxxx
10xx xxxx
11xx xxxx
Fast filter bandwidth
3500 Hz
7000 Hz
14000 Hz
reserved for future use
Slow filter time
constant
Alpha value
16 ms
0.00006
8 ms
0.00012
4 ms
0.00024
2 ms
0.00048
Coefficient β value
0.25
0.125
0.0625
reserved for future use
Defect detector maximum ON time
1.0 ms
1.5 ms
2.0 ms
2.5 ms
Table 56 interrupt_mask parameter: mask to enable
interrupt in interrupt status register; RAM
address 53H
interrupt_mask
0000 0000
xxxx xxx1
xxxx xx1x
xxxx x1xx
xxxx 1xxx
xxx1 xxxx
xx1x xxxx
x1xx xxxx
Interrupt enabled
no interrupt
focus lost
subcode ready
subcode absolute seconds
changed
subcode discontinuity
radial error
autosequencer state
changes
autosequencer error
Table 57 time_parameter: timer interrupt values
time_parameter value
(decimal)⁽¹⁾
129 ≤ i ≤ 143
144 ≤ i ≤ 159
160 ≤ i ≤ 175
176 ≤ i ≤ 191
192 ≤ i ≤ 207
208 ≤ i ≤ 223
224 ≤ i ≤ 239
2402 ≤ i ≤ 55
0 ≤ i ≤ 15
16 ≤ i ≤ 31
32 ≤ i ≤ 47
48 ≤ i ≤ 63
64 ≤ i ≤ 79
80 ≤ i ≤ 95
96 ≤ i ≤ 111
111
112...127
Timer interrupt values
wait time (ms)
4.26 × (i − 128)
68.2 + 4.57 × (i − 144)
141.4 + 4.92 × (i − 160)
224.1 + 5.33 × (i − 176
305.4 + 5.82 × (i − 192
398.5 + 6.40 × (i − 208)
500.8 + 7.11 × (i − 224
614.6 + 8.00 × (i − 240)
742.6 + 9.11 × i
888.9 + 10.6 × (i − 16)
1059 + 12.8 × (i − 32)
1263 + 16.0 × (i − 48)
1519 + 21.2 × (i − 64)
1860 + 32.0 × (i − 80)
2372 + 64.0 × (i − 96)
3398.0
infinite
Note
1. The time_parameter values are also used for
focus_start_time, motor_start_time1,
motor_start_time2, radial_init_time and brake_time.
Table 58 phase_shift parameter: focus/radial AGC
detection phase shift; RAM address 67H
phase_shift
(decimal)
0
1 × a⁽¹⁾
2×a
i×a
128
−1 × a
−2 × a
−i × a
128
Focus/radial AGC detection phase
shift
(µs)
(deg)
0
60.47
120.94
i × 60.47
−60.47
−120.94
−i × 60.47
0
180 × (a/128)
180 × (2 × a/128)
180 × (i × a/128)
180
−180 × (a/128)
−180 × (2 × a/128)
−180 × (i × a/128)
180
Note
1. The value a is the value programmed in Table 60 as
the 6 LSBs of osc_inc.
2003 Oct 01
66