SAA7824 Datasheet, PDF (59/89 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 30 foc_parm3 parameter: focus lead length, CA
start level for focus acquisition
foc_parm3
foc_lead_length value
(binary)
0000 xxx1
1000 xxx1
0100 xxx1
1100 xxx1
0010 xxx1
1010 xxx1
0110 xxx1
1110 xxx1
0001 xxx1
1001 xxx1
0101 xxx1
1101 xxx1
0011 xxx1
1011 xxx1
0111 xxx1
1111 xxx1
CA_start value (binary)
xxxx 000x
xxxx 001x
xxxx 010x
xxxx 011x
xxxx 100x
xxxx 101x
xxxx 110x
xxxx 111x
Focus lead length f₃/f₂
64
32
21.3
16
12.8
10.7
9.1
8
7.1
6.4
5.8
5.3
4.9
4.6
4.3
4
CA_min
0.0225
0.03
0.045
0.06
0.09
0.125
0.18
1.0
Table 31 CA_drop parameter: CA level for dropout
detection
CA_drop value (binary)
xxx0 0000
xxx0 0100
xxx0 1000
xxx0 1100
xxx1 0000
xxx1 0100
xxx1 1000
xxx1 1100
CA_min
0.0225
0.03
0.045
0.06
0.09
0.125
0.18
1.0
Table 32 FE_start parameter: minimum threshold for
focus start
FE_start value (decimal)
0
1
2
i
64
65...127
127
128...255
Minimum threshold for
(d₁ − d₂)/(d₁ + d₂)
always
1/127
2/127
i/127
64/127
65 to 127/127
continuous ramping
not allowed
Table 33 foc_int_strength parameter: focus integrator
strength
foc_int_strength value
(decimal)
0
1
2
i
21
22...255
Focus integrator
strength f₅ Hz
integrator hold
1.2
2.4
1.2 × i
25
undefined
Table 34 foc_gain parameter: focus gain
foc_gain value (decimal)
1
2
3
i
255
0
G
2048
1024
2048/3
2048/i
2048/255
undefined
2003 Oct 01
59