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TZA1038HW-TZA1038HW/E
High speed advanced analog DVD signal processor and laser supply
Philips Semiconductors Product specification
High speed advanced analog DVD signal
processor and laser supply TZA1038HW
CONTENTS FEATURES GENERAL DESCRIPTION ORDERING INFORMATION QUICK REFERENCE DATA BLOCK DIAGRAM PINNING FUNCTIONAL DESCRIPTION
7.1 RF data processing
7.2 Servo signal processing
7.2.1 Servo signal path set-up
7.2.2 Focus servo
7.2.3 Radial servo
7.2.4 Differential phase detection
7.2.4.1 Drop-out concealment
7.2.4.2 Push-pull and three-beam push-pull
7.2.4.3 Enhanced push-pull (dynamic offset
compensation for beam landing)
7.2.4.4 Offset compensation
7.2.5 Automatic dual laser supply
7.2.6 Power-on reset and general poweron
7.2.7 Compatibility with TZA1033HL/V1
7.2.7.1 Software compatibility
7.2.7.2 Hardware compatibility
7.2.8 Interface to the system controller
7.3 Control registers
7.3.1 Register 0: power control
7.3.2 Register 1: servo and RF modes
7.3.3 Register 2: focus offset DAC
7.3.4 Register 3: RF path gain
7.3.5 Register 4: RF left and right, or sum offset
compensation
7.3.6 Register 5: RF sum offset compensation
7.3.7 Register 6: servo gain and dynamic radial
offset compensation factor
7.3.8 Register7: servo path gain and bandwidth and path bandwidth and pre-emphasis
7.3.9 Register 8: RF channel selection
7.3.10 Register 11: radial servo offset cancellation
7.3.11 Register 12: central servo offset cancellation
inputsA andB
7.3.12 Register 13: central servo offset cancellation
inputsC andD
7.3.13 Register 14: RF filter settings
7.3.14 Register 15: DPD filter settings
7.4 Internal digital control, serial bus and external
digital input signal relationships
7.4.1 STANDBY mode
7.4.2 RF only mode
7.5 Signal descriptions
7.5.1 Data path signals through pinsAtoD
7.5.2 Data signal path through input pins RFSUMP
and RFSUMN
7.5.3 HF filtering
7.5.4 Focus signals
7.5.5 Radial signals
7.5.5.1 DPD signals (DVD-ROM mode) with no
drop-out concealment
7.5.5.2 DPD signals (DVD-ROM mode) with
drop-out concealment
7.5.5.3 Three-beam push-pull (CD mode)
7.5.5.4 Enhanced push-pull LIMITING VALUES THERMAL CHARACTERISTICS CHARACTERISTICS APPLICATION INFORMATION
11.1 Signal relationships
11.1.1 Data path
11.1.2 Servo path
11.2 Programming examples
11.3 Energy saving
11.4 Initial DC and gain setting strategy
11.4.1 Electrical offset from pick-up
11.4.2 Gain setting servo
11.4.3 DC level in RF path
11.4.4 Gain setting RF path PACKAGE OUTLINE SOLDERING
13.1 Introduction to soldering surface mount
packages
13.2 Reflow soldering
13.3 Wave soldering
13.4 Manual soldering
13.5 Suitability of surface mount IC packages for
wave and reflow soldering methods DATA SHEET STATUS DEFINITIONS DISCLAIMERS
Philips Semiconductors Product specification
High speed advanced analog DVD signal
processor and laser supply TZA1038HW
FEATURES Operates with DVD-ROM, DVD+RW, DVD-RW,
CD-ROM and CD-RW Operates up to 64× CD-ROM and 12× DVD-ROM RF data amplifier with wide, fine pitch programmable
noise filter and equalizer equivalent to 64× CD or× DVD Programmable RF gain for DVD-ROM, CD-RW and
CD-ROM applications (approximately 50 dB range to
cover a large range of disc-reflectivity and OPUs) Additional RF sum input Balanced RF data signal transfer Universal photodiode IC interface using internal
conversion resistors and offset cancellation Input buffers and amplifiers with low-pass filtering Three different tracking servo strategies: Conventional three-beam tracking for CD Differential Phase Detection (DPD) for DVD-ROM,
including option to emulate traditional drop-out
detection: Drop-Out Concealment (DOC) Advanced push-pull with dynamic offset
compensation. Enhanced signal conditioningin DPD circuitfor optimal
tracking performance under noisy conditions Radial error signal for Fast Track Counting (FTC) RF only mode: servo outputs canbesetto 3-state, while data path remains active Radial servo polarity switch Flexible adaption to different light pen configurations Two fully automatic laser controls for red and infrared
lasers, including stabilization and an on/off switch Automatic selection of monitor diode polarity Digital interface with 3 and5 V compatibility.
GENERAL DESCRIPTIONThe TZA1038HW is an analog preprocessor and laser
supply circuit for DVD and CD read-only players. The
device contains data amplifiers, several options for radial
tracking and focus control. The preamplifier forms a
versatile, programmable interface between single light
path voltage output CD or DVD mechanisms to Philips
digital signal processor family for CD and DVD (for
example, Gecko, HDR65 or Iguana). A separate
high-speed RFSUM input is available.
The device contains several options for radial tracking: Conventional three-beam tracking for CD Differential phase detector for DVD Push-pull with flexible left and right weighting to
compensate dynamic offsets e.g. beam landing offset A radial error signal to allow Fast Track Count (FTC)
during track jumps.
The dynamic range of this preamplifier and processor
combination can be optimized for LF servo and RF data
paths. The gain in both channels can be programmed
separately and so guarantees optimal playability for all
disc types.
The RF path is fully DC coupled. The DC content
compensation techniques provide fast settling after disc
errors.
The device can accommodate astigmatic, single foucault
and double foucault detectors and canbe used with P-type
lasers with N-sub or P-sub monitor diodes. After an initial
adjustment, the circuit will maintain control over the laser
diode current. With an on-chip reference voltage
generator, a constant stabilized output power is ensured
and is independent of ageing. internal Power-on reset circuit ensuresa safe start-up
condition.
Philips Semiconductors Product specification
High speed advanced analog DVD signal
processor and laser supply TZA1038HW
ORDERING INFORMATION QUICK REFERENCE DATA
Philips Semiconductors Product specification
High speed advanced analog DVD signal
processor and laser supply TZA1038HW
Notes Input logic voltage level follows the supply voltage applied at pin VDDD3. High FTC bandwidth is achieved when IS1 andIS2> 1.5 μA.
Philips Semiconductors Product specification
High speed advanced analog DVD signal
processor and laser supply TZA1038HW
BLOCK DIAGRAM
Philips Semiconductors Product specification
High speed advanced analog DVD signal
processor and laser supply TZA1038HW
PINNING
Philips Semiconductors Product specification
High speed advanced analog DVD signal
processor and laser supply TZA1038HW
Philips Semiconductors Product specification
High speed advanced analog DVD signal
processor and laser supply TZA1038HW FUNCTIONAL DESCRIPTION
7.1 RF data processing
The RF data path is a fully DC-coupled, multi-stage
amplifier (see Fig.3). The input signal for data can be
selected from RF inputs Ato D or from the summed inputs RFSUMP and RFSUMN. Switching between the
two setsof signalsis performedbyan internal multiplexer.
The signals are fully balanced internallyto improve signal
quality and reduce power supply interference. outputs RFP and RFN can be DC coupled to the
Analog-to-Digital Converter (ADC) of the decoder.
The RF input signals are from photodiodes and have large DC contentby nature. This DC component mustbe
removed from the signals for good system performance.
Built-in DACs, located after the input stages and RFSUM, havetheabilitytodo this. The DAC range
and resolution is scaled with the gain setting of the first
amplifier stage. When the DC content is removed, the signal can be DC coupled to the decoder. The main
advantage of DC coupling is fast recovery from signal
swings due to disc defects since there is no AC coupling
capacitance to slow the recovery. When using DC
coupling, both AC and DC content in the data signal is
known. The Philips Iguana decoders have on-chip control
loops to support Automatic Gain Control (AGC) and DC
cancellation.
Two separate DACs are availablefor cases where the left
and right side DC conditions can be different.
Whenitis not possibleto havea DC connection between
the TZA1038HW and the decoder, the signals on servo
outputs OAto OD can be used as they contain the same
LP-filtered and DC coupled information.
Summingof the photodiode signalsAtoDis performedin
the second amplifier stage G2. Each individual diode
channel can be switched on, off or inverted with switches
SW-Ato SW-D.
Switching between photodiode signals and RFSUM input
is performed immediately before the third amplifier
stage G3. This stage has a variable gain with fine
resolution to allow automatic gain adjustment to be
controlled by the decoder.
The filter stage limits the bandwidth according to the
maximum playback speed of the disc. This is to optimize
the noise performance. The filter stage consists of an
equalizer and a noise filter, both of which can be
bypassed, also the boost factorof the equalizercanbe set.
The corner frequenciesof the equalizer and noise filter are
equal and can be programmed to a 7-bit resolution.
The RF output signals RFP and RFN can be DC coupled
to a decoder with a differential input pair (as with Philips
Iguana decoders). The common mode output voltage can
be set externally at pin RFREF.
The signals for differential phase detection are tapped
from the inputsAto D at the RF amplifier G1 stages. cancellation for the Ato D and RFSUM signal paths
can be set independently or simultaneously.
Philips Semiconductors Product specification
High speed advanced analog DVD signal
processor and laser supply TZA1038HW
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Philips Semiconductors Product specification
High speed advanced analog DVD signal
processor and laser supply TZA1038HW
7.2 Servo signal processing
The photodiode configurations and naming conventions
are shown in Figs4 and5.
7.2.1 SERVO SIGNAL PATH SET-UP block diagramof the servo signal pathis shownin Fig.6.
In general, the servo signal path comprises:A voltage-to-current converter withprogrammable offset
voltage source VLFOFFS that is common to all inputsA 4-bit DACfor eachof thesix channelsto compensate
for offset per channel A variable gain stage to adapt the signal level to the
specific pick-up and disc properties Low-pass filtering and output stage for the photodiode
current signals Error output stage in the radial data path for fast track
counting.
Servo output signals OAto OD, S1 and S2 are unipolar
current signals which represent the low-pass filtered
photodiode signals.In DPD radial tracking, theS1 andS2
signals are the equivalent ofthe satellite signals commonly
found in traditional CD systems.
The servo output signals OAto OD, S1 and S2 are set to
3-state if bit RFonly= 1 (register 13, bit 11).
7.2.2 FOCUS SERVO
Focus information is reflected in the four outputsto OD. Gain and offset can be programmed.
For optical pick-ups where only channels B and C are
used for focus, channels A and D can be switched off
(bit Focus_mode=0).
For initial alignment, a copy of the output currents can be
made available on pin OCENTRAL.
7.2.3 RADIAL SERVO
Radial information can be obtained from the two output
signals S1 and S2, and the gain and offset can be
programmed. The TZA1038HW provides differential
phase detection, push-pull and three-beam push-pull for
radial tracking. The signal FTC is made available for fast
track counting and is primarily the voltage error signal
derived from signals S1or S2.
The polarityof the radial loop canbe reversedvia the serial
control bus (RAD_pol).
Philips Semiconductors Product specification
High speed advanced analog DVD signal
processor and laser supply TZA1038HW
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Philips Semiconductors Product specification
High speed advanced analog DVD signal
processor and laser supply TZA1038HW
7.2.4 DIFFERENTIAL PHASE DETECTION
The TZA1038HW provides differential phase detection to
support DVD in various ways: DPD2 withfour channels programmedtobe active gives
DPD as required in the standard specification Twoof the four channels canbe excluded from the DPD
for pick-ups withan alternative photodiode arrangement An increase in performance, dedicated for DVD+RW,
can be obtained by using the DPD4 method. Then two
truly separated phase detectors are active. After the
phase detection of the two input pairs the result is
summed.
Input signalsfor DPD aretakenfrom inputpinsAto Dafter
the firstgain stageG1 (see Fig.3). Pre-emphasisis applied meansofa programmable lead/lag filter. Additionally,a
programmable low-pass filter is available to improve the
signal quality under noisy signal conditions at lower
speeds. For further signal improvements the DPD pulse
stretcher can be programmed to higher values at lower
speeds.
The DPD signal is low-pass filtered by two internal
capacitors. The signal is then fed to pinsS1 and S2, or
directedvia the drop-out concealment circuitto the outputs
(see Section 7.5).
7.2.4.1 Drop-out concealment special functionis builtinfor compatibility with drop-out
detection strategies, based on level detection in the and S2 signals. When using DPD in a fundamental
way, thereisno representationof mirror level information
from the light pen.
When the drop-out concealment function is enabled
(bit DOCEN= 1), a portion of the Central Aperture (CA)
signal is added to S1 and S2. Also, when the CA signal
drops below the DOC threshold, the DPD signal is
gradually attenuated.
The DPD detection cannot work properly when the input
signal becomes very small. The output of the DPD may
then show a significant offset. The DOC may not conceal
this offset completely because: DOC is gradually controlled from the CA signal The CA signal may not become 0 during disc-defect.
For details see Section 7.5.5.2
7.2.4.2 Push-pull and three-beam push-pull
The TZA1038HW can also provide radial information by
meansof push-pull signals (from the photodiode inputs)ora three-spot optical system with Three-Beam Push-Pull
(TBPP). The built-in multiplexer givesa flexible methodof
dealing with many detector arrangements. For push-pull,
the input signals are taken from channelsAtoD. Thereis
also a command that switches off channels B andC,
leaving channels A and D for push-pull
(bits RT_mode[2:0]).
For TBPP,theinput signalis taken from channelsE andF,
irrespective of bit RFSUM setting.
7.2.4.3 Enhanced push-pull (dynamic offset
compensation for beam landing)
This optioncancels offsets dueto beam landing.A factorα
canbe programmedto re-balance the signalgain between
channels S1 and S2. In a simplified form this can be
described as:= ALFR ×α× input left= ALFR×(2 −α)× input right.
Factorα canbe programmedina range from 0.6to 1.35,
with 1.0 as the balanced condition (bits α[3:0]).
7.2.4.4 Offset compensation provisionis madeto compensate electrical offset froma
light pen. The offset voltage from the light pen can be
positiveor negative.In general, the offset betweenanytwo
channelsis smaller than the absolute offsets.As negative
input signals cannot be handled by the TZA1038HW
internal servo channels, a two-step approach is adopted:A coarse DAC, commontoall the input channels, adds offset that shifts the input signalsin positive direction
until all inputs are ≥0. The DAC used (LFOFFS) has a
2-bit resolution (bits LFOFF[1:0]). A fine setting per channel is provided to cancel the
remainder of the offset between the channels. This is
achievedby DACs subtracting the DC component from
the signals andbringing the inputsto approximately zero
offset (within≈1 mV). The DACs (registers11to 13)
have a 4-bit resolution.
The range of both DACs can be increased by a factor of
threeto compensatefor higher offset valuesby meansof
control parameter bit SERVOOS.
With a switched-off laser, the result of the offset
cancellation can be observed at each corresponding
output pin, OAto OD, S1 and S2, or via a built-in
multiplexer to pin OCENTRAL (central channels only).
See registers11to 13 for DAC and multiplexer control.
Philips Semiconductors Product specification
High speed advanced analog DVD signal
processor and laser supply TZA1038HW
7.2.5 AUTOMATIC DUAL LASER SUPPLY
The TZA1038HW can control the output power of two
lasers; it has an Automatic Laser Power Control (ALPC)
that stabilizes the laser output power and compensates
the effects of temperature and ageing of the laser.
ALPC automatically detects if there is a P-type or N-type
monitor diode in use in either of the laser circuits. The
regulation loop formedby the ALPC, the laser, the monitor
diode and the associated adjustment resistor will settleat
the monitor input voltage. The monitor inputvoltage canbe
programmed to HIGH (≈ 180 mV) or LOW (≈ 150 mV),
according to frequently-used pre-adjustments of the light
pen. This set point can be set independently for both
ALPCs. Bandwidth limitation and smooth switch-on
behaviour is realized using an internal capacitor.
A protection circuit is included to prevent laser damage
dueto dipsin laser supply voltage VDDL.Ifa supply voltage
dip occurs, the output can saturate and restrict the
required laser current. Without the protection circuit, the
ALPC would try to maximize the output power with
destructive results for the laser when the supply voltage
recovers. The protection circuit monitors the supply
voltage and shuts off the laser when the voltage drops
belowa safe value. The ALPC recoversautomatically after
the dip has passed.
Only one laser can be activated at the same time. internal break-before-make circuit ensures safe
start-up for the laser when a toggle situation between the
two lasersis detected. When both lasers are programmed
on, neither laser will be activated.
7.2.6 POWER-ON RESET AND GENERAL POWERON
When the supply voltage is switched on, bit PWRON is
reset by the Power-On Reset (POR) signal. This
concludes in a STANDBY mode at power up. POR is
intended to prevent the lasers being damaged due to
random settings. Allother functions maybe switched when
power is on. The TZA1038HW becomes active when
bit PWRON=1.
7.2.7 COMPATIBILITY WITH TZA1033HL/V1
7.2.7.1 Software compatibility
The TZA1038HW is highly software compatible with the
TZA1033HL/V1. Provided that some conditions are met,
the software of the TZA1038HW can be used as a
successor with just minor modifications. This compatibility
is achieved with the implementation of the TZA1038HW
mode control bit (bit K2_Mode). When bit K2_Mode=0,
the TZA1038HW will act as a TZA1033HL/V1. When
bit K2_Mode= 1, the TZA1038HW will act as a
TZA1033HL/K2 and the new functions will be available
(but require a software update).
Other conditions or restrictions are: Register bitsof the TZA1038HW which were not defined
are programmedto alogic0. Registers9, 10,14 and15
may be left undefined TheG4 stage high gain settingof the TZA1033HL/V1is
not availablein the TZA1038HW;if this value was setto
logic 0, there will be no difference Whenbit K2_Mode=0 the RF bandwidth will befixedto
the minimum value of10 MHz (typical);bit K2_Mode=1
toselecta higher bandwidth; the bandwidthis now lower
than using a TZA1033HL/V1.
7.2.7.2 Hardware compatibility
The packageis changed fromLQFP64for the TZA1033HL
to LQFP48 for the TZA1038HW.
The hardware differences are: Input pins STB, HEADER and LANDof the TZA1033HL
are not present Input pins CD of TZA1033HL/V1 are not used;
TZA1038HW has RFSUM inputs instead; the RFSUM
inputs of TZA1038HW may be connected to ground
when not used.
Philips Semiconductors Product specification
High speed advanced analog DVD signal
processor and laser supply TZA1038HW
7.2.8 INTERFACETO THE SYSTEM CONTROLLER
Programming the registers of TZA1038HW is done via a
serial bus (see Fig.7). The circuitry is formed by a serial
input shift register anda numberof registers that store the
data. The registers can always be programmed,
irrespective of STANDBY mode. required, the bus lines canbe connectedin parallel with
an I2 C-bus. The protocol needs no switching of the data
line during SICL= HIGH. This means that other I2 C-bus
devices will not recognise any START or STOP
commands. Control words addressed to TZA1038HW
should go uniquely with the SILD signal. When
SILD= HIGH, the TZA1038HW will not respond to any
signal on SIDA or SICL.
During a transmission, the serial data is first stored in an
input shift register.At the rising edgeof SILD, the content
of the input register is copied into the addressed register.
This is also the moment the programmed information
becomes effective.
The input pins have CMOS compatible threshold levelsfor
both 3.3 and5 V supplies.
7.3 Control registers
The TZA1038HW is controlled by serial registers. To keep programming fast and efficient, the control bits are sent in
16-bit words. Four bits of the word are used for the address and for each address there are 12 data bits.
Table 1 Overview of control parameters
Philips Semiconductors Product specification
High speed advanced analog DVD signal
processor and laser supply TZA1038HW
Philips Semiconductors Product specification
High speed advanced analog DVD signal
processor and laser supply TZA1038HW
7.3.1 REGISTER0: POWER CONTROL
Table 2 Register address 0H
Table 3 Description of register bits (address 0H)
Philips Semiconductors Product specification
High speed advanced analog DVD signal
processor and laser supply TZA1038HW
7.3.2 REGISTER1: SERVO AND RF MODES
Table 4 Register address 1H
Table 5 Description of register bits (address 1H)
Philips Semiconductors Product specification
High speed advanced analog DVD signal
processor and laser supply TZA1038HW
7.3.3 REGISTER2: FOCUS OFFSET DAC
Table 6 Register address 2H
Table 7 Description of register bits (address 2H)
7.3.4 REGISTER3: RF PATH GAIN
Table 8 Register address 3H
Table 9 Description of register bits (address 3H)
Philips Semiconductors Product specification
High speed advanced analog DVD signal
processor and laser supply TZA1038HW
7.3.5 REGISTER4: RF LEFT AND RIGHT,OR SUM OFFSET COMPENSATION
Table 10 Register address 4H
Table 11 Description of register bits (address 4H)
7.3.6 REGISTER5: RF SUM OFFSET COMPENSATION
Table 12 Register address 5H
Table 13 Description of register bits (address 5H)
Philips Semiconductors Product specification
High speed advanced analog DVD signal
processor and laser supply TZA1038HW
7.3.7 REGISTER6: SERVO GAIN AND DYNAMIC RADIAL OFFSET COMPENSATION FACTOR
Table 14 Register address 6H
Table 15 Description of register bits (address 6H)
7.3.8 REGISTER7: SERVO PATH GAIN AND BANDWIDTH AND RF PATH BANDWIDTH AND PRE-EMPHASIS
Definitionsin register7 are intended mainlyfor software compatibility with the TZA1033HL/V1. New features that require
more bit-spaceto program aremoved toregisters14 and 15. Only DPD stretch remains programmedin register7. Some
parameters are slightly modified.
Table 16 Register address 7H
Table 17 Description of register bits (address 7H)
Philips Semiconductors Product specification
High speed advanced analog DVD signal
processor and laser supply TZA1038HW
7.3.9 REGISTER8: RF CHANNEL SELECTION
Table 18 Register address 8H
Table 19 Description of register bits (address 8H)
Philips Semiconductors Product specification
High speed advanced analog DVD signal
processor and laser supply TZA1038HW
7.3.10 REGISTER 11: RADIAL SERVO OFFSET CANCELLATION
Table 20 Register address BH
Table 21 Description of register bits (address BH)
7.3.11 REGISTER 12: CENTRAL SERVO OFFSET CANCELLATION INPUTSA ANDB
Table 22 Register address CH
