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PDF TZA1038HW Data sheet ( Hoja de datos )
| Número de pieza | TZA1038HW | |
| Descripción | High speed advanced analog DVD signal processor and laser supply | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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INTEGRATED CIRCUITS
DATA SHEET
TZA1038HW
High speed advanced analog DVD
signal processor and laser supply
Product specification
2003 Sep 03
1 page  
www.DataSheet4U.com
Philips Semiconductors
High speed advanced analog DVD signal
processor and laser supply
Product specification
TZA1038HW
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
Vi(RF)(FS)
Vi(SUM)(dif)
VI(DC)
Vo(RF)(dif)(p-p)
VO(RF)(DC)
Vi(RFREF)(CM)
input voltage on
at the appropriate signal
pins A to D for full-scale at path gain setting
output
RF signal path
−
LF signal path
−
differential input voltage
on pins RFSUMP and
RFSUMN
GRFSUM = −6 dB
−
DC input voltage range on with respect to VSS
pins RFSUMP and
RFSUMN
1.3
differential output voltage
on pins RFP and RFN
(peak-to-peak value)
−
DC output voltage on
pins RFP and RFN
0.35
input reference voltage on
pin RFREF for common
mode output
0.8
−
−
−
−
−
−
1.2
600
700
1 800
VDDA − 1.0
1.4
VDDA − 1.9
2.1
Laser supply
Io(laser)(max)
Vi(mon)
maximum current output
to laser
input voltage from laser
monitor diode
P-type monitor diode
LOW level voltage
HIGH level voltage
N-type monitor diode
LOW level voltage
HIGH level voltage
−120 −
−
− VDDA4 − 0.155 −
− VDDA4 − 0.190 −
− 0.155
− 0.185
−
−
Notes
1. Input logic voltage level follows the supply voltage applied at pin VDDD3.
2. High FTC bandwidth is achieved when IS1 and IS2 > 1.5 µA.
UNIT
mV
mV
mV
V
V
V
V
mA
V
V
V
V
2003 Sep 03
5
5 Page 
www.DataSheet4U.com
Philips Semiconductors
High speed advanced analog DVD signal
processor and laser supply
Product specification
TZA1038HW
7.2 Servo signal processing
The photodiode configurations and naming conventions
are shown in Figs 4 and 5.
7.2.1 SERVO SIGNAL PATH SET-UP
A block diagram of the servo signal path is shown in Fig.6.
In general, the servo signal path comprises:
• A voltage-to-current converter with programmable offset
voltage source VLFOFFS that is common to all inputs
• A 4-bit DAC for each of the six channels to 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 OA to OD, S1 and S2 are unipolar
current signals which represent the low-pass filtered
photodiode signals. In DPD radial tracking, the S1 and S2
signals are the equivalent of the satellite signals commonly
found in traditional CD systems.
The servo output signals OA to OD, S1 and S2 are set to
3-state if bit RFonly = 1 (register 13, bit 11).
handbook, halfpagAe
B
DC
Data = A + B + C + D
Push-pull = (A + B) − (C + D)
Focus = (A + C) − (B + D)
DPD2 = phase (A + B, C + D)
DPD4 = phase (A,D) + phase (C,B)
left
tangential direction
right
MGW553
Fig.4 Astigmatic diode configuration.
handbook, halfpage
left
tangential direction
right
A BC D
MGW554
Data = A + B + C + D
Push-pull = A − D
Focus = C − B
DPD2 = phase (A, D)
DPD4 not applicable
Fig.5 Foucault diode configuration.
7.2.2 FOCUS SERVO
Focus information is reflected in the four outputs
OA to 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 S1 or S2.
The polarity of the radial loop can be reversed via the serial
control bus (RAD_pol).
2003 Sep 03
11
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| PDF Descargar | [ Datasheet TZA1038HW.PDF ] | |
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