Philips SACD 1000/001 Service Manual page 71

Circuit-, IC descriptions and list of abbreviations
DSP for CD and DVD-ROM systems
FEATURES
• Compatibility with CD-I, CD-ROM, MPEG-video
DVD-ROM and DVD-video applications
• Designed for very high playback speeds
• Typical CD-ROM operation up to n = 12, DVD-ROM to
n = 1.9, maximum rates (tbf)
• Matched filtering, quad-pass error correction
(C1-C2-C1-C2), overspeed audio playback function
included (up to 3 kbytes buffer)
• Lock-to-disc playback, Constant Angular Velocity
(CAV), pseudo-Constant Linear Velocity (CLV) and CLV
motor control loops
• Interface to 32 kbytes SRAM for DVD error correction
and de-interleave
• Sub-code/ header processing for DVD and CD formats
• Programmable HF equalizer
• In DVD mode it is still compatible with Philips block
decoders
• Sub-CPU interface can be parallel or fast I
• On-chip clock multiplier.
GENERAL DESCRIPTION
This device is a high-end combined Compact Disc (CD)
and Digital Versatile Disc (DVD) compatible decoding
device. The device operates with an external 32 kbytes
S-RAM memory for de-interleaving operations. The device
provides quad-pass error correction for CD-ROM
applications (C1-C2-C1-C2) and operates in lock-to-disk,
CAV, pseudo CLV and CLV modes.
QUICK REFERENCE DATA
SYMBOL
V digital supply voltage
DDD
I digital supply current
DDD
V analog supply voltage
DDA
I analog supply current
DDA
f crystal input frequency
xtal
T operating ambient temperature
amb
T storage temperature
stg
In DVD modes double-pass C1-C2 error correction is used
which is capable of correcting up to 5 C1 frame errors and
16 C2 frame errors.
The SAA7335 contains all the functions required to
decode an EFM or EFM+ HF signal directly from the laser
pre-amplifier, including analog front-end, PLL data
recovery, demodulation and error correction. The spindle
motor interface provides both motor control signals from
the demodulator and, in addition, contains a tachometer
loop that accepts tachometer pulses from the motor unit.
The SAA7335 has two independent microcontroller
interfaces. The first is a serial I
standard 8-bit multiplexed parallel interface. Both of these
interfaces provide access to a total of 32 × 8-bit registers
2
C-bus
for control and status.
This data sheet contains an descriptive overview of the
device together with electrical and timing characteristics.
For a detailed description of the device refer to the user
guide "SAU/UM96018" .
Supply of this CD/DVD IC does not convey an implied
license under any patent right to use this IC in any CD or
DVD application.
PARAMETER
SACD 1000
2
C-bus and the second is a
MIN. TYP. MAX.
4.5 5.0 5.5
−
70 300
4.5 5.0 5.5
−
70 300
4 25 tbf
−20 −
+70
−55 −
+125
9. GB 115
SAA7335
UNIT
V
mA
V
mA
MHz
°C
°C