saa7825 NXP Semiconductors, saa7825 Datasheet - Page 59

• Manufacturer Part Number: saa7825
• Description: Cd Audio Decoder, Digital Servo And Filterless Dac With Integrated Pre-amp And Laser Control
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 30 foc_parm3 parameter: focus lead length, CA
Table 31 CA_drop parameter: CA level for dropout
2003 Aug 13
CA_start value (binary)
CA_drop value (binary)
CD audio decoder, digital servo and filterless
DAC with integrated pre-amp and laser control
foc_lead_length value
foc_parm3
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
xxx0 0000
xxx0 0100
xxx0 1000
xxx0 1100
xxx1 0000
xxx1 0100
xxx1 1000
xxx1 1100
xxxx 000x
xxxx 001x
xxxx 010x
xxxx 011x
xxxx 100x
xxxx 101x
xxxx 110x
xxxx 111x
start level for focus acquisition
detection
(binary)
Focus lead length f
0.0225
0.0225
CA
CA
0.045
0.125
0.045
0.125
21.3
12.8
10.7
0.03
0.06
0.09
0.18
0.03
0.06
0.09
0.18
9.1
7.1
6.4
5.8
5.3
4.9
4.6
4.3
1.0
1.0
64
32
16
8
4
min
min
3
/f
2
59
Table 32 FE_start parameter: minimum threshold for
Table 33 foc_int_strength parameter: focus integrator
Table 34 foc_gain parameter: focus gain
FE_start value (decimal)
foc_gain value (decimal)
foc_int_strength value
(decimal)
128...255
focus start
strength
65...127
22...255
127
255
64
21
0
1
2
0
1
2
1
2
3
0
i
i
i
Minimum threshold for
continuous ramping
(d
Focus integrator
Objective specification
strength f
integrator hold
1
65 to 127/127
not allowed
undefined
undefined
2048/255
d
always
64/127
2048/3
1.2
2048/i
1/127
2/127
SAA7825
i/127
2048
1024
2
1.2
2.4
25
)/(d
G
1
i
5
+ d
Hz
2
)