參數(shù)資料
型號(hào)： TZA1035HL
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 消費(fèi)家電
英文描述： High speed advanced analog DVD signal processor and laser supply
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP48
封裝： 7 X 7 MM, 1.40 MM HEIGHT, PLASTIC, SOT-313-2, MS-026, LQFP-48
文件頁(yè)數(shù)： 11/48頁(yè)
文件大?。?/td> 199K
代理商： TZA1035HL
2003 Jun 03
11
Philips Semiconductors
Preliminary specification
High speed advanced analog DVD signal
processor and laser supply
TZA1035HL
7.2
Servo signal processing
The photodiode configurations and naming conventions
are shown in Figs 4 and 5.
7.2.1
S
ERVO SIGNAL PATH SET
-
UP
A block diagram of the servo signal path is shown in Fig.6.
In general, the servo signal path comprises:
Avoltage-to-currentconverterwithprogrammableoffset
voltage source V
LFOFFS
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
signalsaretheequivalentofthesatellitesignalscommonly
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).
7.2.2
F
OCUS 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
R
ADIAL SERVO
Radial information can be obtained from the two output
signals S1 and S2, and the gain and offset can be
programmed. The TZA1035HL 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.
Thepolarityoftheradialloopcanbereversedviatheserial
control bus (RAD_pol).
MGW553
handbook, halfpage
tangential direction
left
right
C
D
B
A
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)
Fig.4 Astigmatic diode configuration.
Fig.5 Foucault diode configuration.
Data = A + B + C + D
Push-pull = A
D
Focus = C
B
DPD2 = phase (A, D)
DPD4 not applicable
MGW554
handbook, halfpage
tangential direction
left
right
D
C
B
A
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