參數(shù)資料
型號(hào)： TZA1038HW,118
廠商： NXP Semiconductors
文件頁數(shù)： 3/45頁
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
11
Philips Semiconductors
Product specication
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 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).
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).
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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