saa7327 NXP Semiconductors, saa7327 Datasheet - Page 8

• Manufacturer Part Number: saa7327
• Description: Digital Servo Processor And Compact Disc Decoder With Integrated Dac For Video Cd Cd7 Ii
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7
7.1
7.1.1
The decoding part supports a full audio specification and
can operate at two different disc speeds, from
single-speed (n = 1) to 2 times speed (n = 2). The factor
‘n’ is called the overspeed factor. A simplified data flow
through the decoder part is illustrated in Fig.7.
7.1.2
The SAA7327 is a two speed decoding device, with an
internal Phase-Locked Loop (PLL) clock multiplier.
2000 Jun 26
handbook, full pagewidth
Digital servo processor and Compact Disc
decoder with integrated DAC for video CD (CD7 II)
FUNCTIONAL DESCRIPTION
Decoder part
P
D
RINCIPAL OPERATIONAL MODES OF THE DECODER
ECODING SPEED AND CRYSTAL FREQUENCY
CROUT
HFREF
V DDA1
V SSA1
V SSA2
ISLICE
CRIN
V RIN
HFIN
I ref
D1
D2
D3
D4
R1
R2
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
Fig.2 Pin configuration.
SAA7327H
8
Depending on the crystal frequency used and the internal
clock settings (selectable via decoder register B), the
playback speeds shown in Table 1 are possible, where ‘n’
is the overspeed factor (1 or 2).
An internal clock multiplier is present, controlled by
SELPLL, and should only be used if a 8.4672 or
16.9344 MHz crystal, ceramic resonator or external clock
is present.
7.1.3
For Electronic Shock Absorption (ESA) applications, the
SAA7327 can be put into lock-to-disc mode. This allows
Constant Angular Velocity (CAV) disc playback with
L
OCK
-
TO
-
DISC MODE
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
MGS249
SBSY
SFSY
SUB
RCK
TEST3
STATUS
SILD
RAB
SCL
SDA
RESET
SCLI
SDI
WCLI
V2/V3
V SSD1
Product specification
SAA7327