參數(shù)資料
型號(hào)： TZA1038HW,118
廠商： NXP Semiconductors
文件頁(yè)數(shù)： 35/45頁(yè)
文件大小： 0K
描述： IC DVD SIGNAL PROC 48-HTQFP
標(biāo)準(zhǔn)包裝： 2,500
系列： *
類型： *
應(yīng)用： *
安裝類型： 表面貼裝
封裝/外殼： 48-TQFP 裸露焊盤
供應(yīng)商設(shè)備封裝： 48-HTQFP
包裝： 帶卷 (TR)
其它名稱： 935273843118
TZA1038HW-T
TZA1038HW-T-ND
2003 Sep 03
40
Philips Semiconductors
Product specication
High speed advanced analog DVD signal
processor and laser supply
TZA1038HW
11.3
Energy saving
Bit PWRON can be used to bring the TZA1038HW into
STANDBY mode reducing the supply current to
approximately 0.5 mA.
11.4
Initial DC and gain setting strategy
11.4.1
ELECTRICAL OFFSET FROM PICK-UP
It is useful to compensate for electrical offset, especially
with pick-ups that give a low output signal. It is possible to
compensate for each individual servo channel. Due to
internal circuitry, the TZA1038HW servo channels can
handle only signals positive with respect to the reference
input OPUREF. Therefore the potentially negative offset
from the pick-up must first be cancelled. The LFOFFS DAC
can be programmed to do this, and will apply this to all six
channels at the same time. The LFOFFS DAC can be set
to 0, 5, 10 or 15 mV.
As a second step, the offset between each channel can be
compensated by connecting the DACs to each individual
DAC (COFFSA to COFFSD, ROFFSE and ROFFSF). These
DACs can be programmed between 0 and 20 mV with
approximately 1.25 mV resolution. Where the LFOFFS DAC
increases the outputs signal level, the individual DACs
decrease the output signal. In this way the output signal
can be set very close to zero. The range of DACs, LFOFFS,
COFFS and ROFFS can be tripled with control
bit SERVOOS.
The output current of servo channel A is calculated by:
In case the laser is switched off, the term (VA VOPUREF)
represents the electrical offset from the pick-up.
The procedure to cancel the offset is:
1. Activate the pick-up and switch off the laser.
2. Set LFOFFS to its maximum value.
3. Measure the output currents off all relevant servo
outputs.
4. If all outputs represent a signal >5 mV equivalent input
voltage, decrease VLFOFFS then repeat step 3; if all
outputs represent a signal <5 mV equivalent input
voltage, go to step 5.
5. Measure each output and increase COFFS until the
output current is close enough to zero.
This procedure needs only to be done once, or after a
longer time when temperature may have changed the
pick-up offset.
The test pin OCENTRAL can be useful to follow this
procedure. This pin can be programmed to output a copy
of the signal OA to OD (see register 12).
11.4.2
GAIN SETTING SERVO
The servo gain has to be chosen dependant on the
reflectivity of the disc. So this needs to be done each time
when a new disc is inserted in the mechanism. A trial and
error procedure should find the optimal setting. Gain can
be set in 3 dB steps.
DC LEVEL IN RF PATH
Once the gains in the servo path have been set, the
average DC level at the inputs can be calculated from the
value of the servo output signals:
Where IOx is the average value of the output currents at
pins OA to OD.
This value is a good estimate to use initially to set the
RF DC compensation, VRFOFFS. The range and resolution
of the RFOFFS DACs are scaled with the programmed gain
of G1.
In cases where a DC coupling between TZA1038HW and
the decoder is made, a fine tuning of the RF DC
compensation can be done during play. The zero-crossing
level of the data-eye pattern can be used to judge the
correct DC compensation level.
11.4.4
GAIN SETTING RF PATH
The choice of RF gain is determined by the modulation of
the disc, therefore the modulation needs to be checked
each time a new disc is inserted in the mechanism. A trial
and error procedure should be sufficient to find the
optimum setting. For optimum use of the dynamic range:
Use G3 for fine tuning and AGC, so initially this should
be set in the range 0 to 6 dB to leave an additional gain
of 6 dB free to use during disc defects
Use G1 and G2 to set the gain, increase G1 first,
when G1 has reached its maximum then G2 should be
increased
G2 shows better noise performance in 12 and 24 dB
settings than in 6 and 18 dB setting
A similar procedure can be followed for RFSUM.
I
OA
V
A
V
OPUREF
–
() V
FLOFFS
V
COFFSA
–
+
[] A
LFC
×
14 k
-------------------------------------------------------------------------------------------------------------------------
=
V
I
Ox
14 k
×
A
LFC
V
LFOFFS
V
COFFSx
+
()
–
-------------------------------------------------------------------------
=
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