SAA7824 datasheet(29/89 Pages) PHILIPS

Part #	SAA7824

Description	CD audio decoder, digital servo and filterless DAC with integrated pre-amp and laser control (PhonIC)

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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29 / 89 page

2003 Oct 01

29

Philips Semiconductors

Product speciﬁcation

CD audio decoder, digital servo and ﬁlterless

DAC with integrated pre-amp and laser control

SAA7824

7.16

Servo part

7.16.1

DIODE SIGNAL PROCESSING

The photo detector in conventional two-stage three-beam

Compact Disc systems normally contains six discrete

diodes. Four of these diodes (three for single foucault

systems) carry the Central Aperture signal (CA) while the

other two diodes (satellite diodes) carry the radial tracking

information. The CA signals are summed into an HF signal

for the decoder function and are also differentiated (after

analog-to-digital conversion) to produce the low frequency

focus control signals.

The low frequency content of the six (five if single

Foucault) photo diode inputs are converted to digital Pulse

Density Modulated (PDM) bitstreams by six Sigma-delta

ADCs. These support a range of OPUs by interfacing to

Voltage mode mechanisms and by having 16 selectable

gain ranges in two sets, one set for D1-to-D4 and the other

for R1 and R2.

Table 13 Shadow register settings to control diode voltage ranges

SHADEN BITS

SHADOW

REGISTER

ADDRESS

DATA

VOLTAGE (mV)

INITIAL

01

(bank 1)

A

signal magnitude

control for diodes

D1 to D4

(LF only)

1010

0000

20

−

0001

25

−

0010

30

−

0011

40

−

0100

60

−

0101

75

−

0110

100

−

0111

120

−

1000

150

−

1001

200

−

1010

270

−

1011

350

−

1100

450

−

1101

600

−

1110

720

−

1111

960

reset

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