Philips Semiconductors
Product specification
CD audio decoder, digital servo and filterless
DAC with integrated pre-amp and laser control
CONTENTS
1
2
3
4
5
6
7
7.1
7.2
7.2.1
7.2.2
7.2.3
7.2.4
7.3
7.4
7.5
7.5.1
7.5.2
7.6
7.6.1
7.6.2
7.7
7.7.1
7.7.2
7.7.3
7.7.4
7.8
7.8.1
7.9
7.9.1
7.9.2
7.9.3
7.9.4
7.9.5
7.10
7.10.1
7.10.2
7.11
7.11.1
7.12
7.12.1
7.12.2
7.13
7.14
7.15
7.15.1
7.15.2
FEATURES
GENERAL DESCRIPTION
ORDERING INFORMATION
QUICK REFERENCE DATA
BLOCK DIAGRAM
PINNING
FUNCTIONAL DESCRIPTION
Data acquisition and HF data path
Decoder part
Principle operating modes of the decoder
Decoder speed and crystal frequency
Lock-to-disc mode
Standby modes
Crystal oscillator
Data slicer and bit clock regenerator
DC offset cancellation
Offset cancellation
Reading back the DC offset value
Demodulator
Frame sync protection
EFM demodulation
Subcode data processing
Q-channel processing
EIAJ 3 and 4-wire subcode (CD graphics)
interface
V4 subcode interface
CD text interface
FIFO and error correction
Flags output (CFLG)
Audio functions
De-emphasis and phase linearity
Digital oversampling filter
Concealment
Mute, full-scale, attenuation and fade
Peak detector
Audio DAC interface
Internal dynamic element matching
digital-to-analog converter
External DAC interface
EBU interface
Format
KILL features
The KILL circuit
Silence injection
Audio features off
The versatile pins interface
Spindle motor control
Motor output modes
Spindle motor operating modes
2
7.15.3
7.15.4
7.16
7.16.1
7.16.2
7.16.3
7.16.4
7.16.5
7.16.6
7.16.7
7.16.8
7.16.9
7.16.10
7.16.11
7.17
7.17.1
7.17.2
7.17.3
7.17.4
7.17.5
7.17.6
7.17.7
8
9
10
11
12
13
14
15
16
16.1
16.2
16.3
16.4
16.5
17
18
19
20
SAA7826
Loop characteristics
FIFO overflow
Servo part
Diode signal processing
Signal conditioning
Focus servo system
Radial servo system
Off-track counting
Track counting modes
Defect detection
Off-track detection
High-level features
Driver interface
Laser interface
Microcontroller interface
Microcontroller interface (4-wire bus mode)
Microcontroller interface (I
2
C-bus mode)
Decoder and shadow registers
Summary of functions controlled by decoder
registers 0 to F
Summary of functions controlled by shadow
registers
Summary of servo commands
Summary of servo command parameters
SUMMARY OF SERVO COMMAND
PARAMETERS VALUES
LIMITING VALUES
CHARACTERISTICS
OPERATING CHARACTERISTICS
(SUBCODE INTERFACE TIMING)
OPERATING CHARACTERISTICS (I
2
S-BUS
TIMING)
OPERATING CHARACTERISTICS
(MICROCONTROLLER INTERFACE TIMING)
APPLICATION INFORMATION
PACKAGE OUTLINE
SOLDERING
Introduction to soldering surface mount
packages
Reflow soldering
Wave soldering
Manual soldering
Suitability of surface mount IC packages for
wave and reflow soldering methods
DATA SHEET STATUS
DEFINITIONS
DISCLAIMERS
PURCHASE OF PHILIPS I
2
C COMPONENTS
2003 Oct 01
Philips Semiconductors
Product specification
CD audio decoder, digital servo and filterless
DAC with integrated pre-amp and laser control
1
FEATURES
SAA7826
•
Decoder and servo parts are based upon the SAA732X
design (the original features are maintained)
•
Software compatibility is maintained with the SAA732X
by using a similar register structure (new features are
controlled from new shadow registers)
•
1×, 2× and 4× speed
•
LF (servo) signals converted to digital representations
by 6 oversampling bitstream ADCs
•
HF part summed from signals D1 to D4 and converted
to a digital signal by a data slicer
•
On-chip buffering and filtering of the diode signals from
the mechanism for signal optimization
•
Selectable DC offset cancellation of quiescent
mechanism voltages and dark currents
•
On-chip laser power control (up to 120 mA)
•
Laser on/off control, including ‘soft’ start control (zero to
nominal power in 1 ms)
•
Monitor control and feedback circuit to maintain nominal
output power throughout laser life
•
Dynamic element matching DAC with minimum external
components
•
DAC performance of
−80
dB Total Harmonic
Distortion + Noise (THD + N) and 90 dB Signal-to-Noise
Ratio (S/N) A-weighted
•
Separate left and right channel digital silence detection
available on the KILL pins
•
Digital silence detection on internal data and loopback
(external) data
•
5 versatile pins, 2 inputs and 3 outputs
•
Integrated CD text decoder with separate
microcontroller interface
•
Dedicated 4 MHz or 12 MHz clock output for
microcontroller (configurable)
•
Configured for N-sub monitor diode
•
On-chip clock multiplier allows the use of an
8.4672 MHz crystal or ceramic resonator
•
The M1 version has an EBU mute function which allows
independent muting of data being transmitted over the
EBU interface whilst maintaining the SPDIF frame
structure.
2
GENERAL DESCRIPTION
This document covers versions M0 and M1 of the CD
audio decoder IC.
The SAA7826 is a CD audio decoder IC which combines
the function of the SAA732X IC with the pre-amplifier and
laser control functions previously found in the TZA102X
IC. The design is intended to reduce the external
component count and hence the Bill Of Material (BOM).
Supply of this Compact Disc IC does not convey an
implied license under any patent right to use this IC in any
Compact Disc application.
2003 Oct 01
3
Analogue and Mixed Signal
京公网安备 11010802033920号
EEWORLD
