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參數資料
型號: TZA1031HL
廠商: NXP SEMICONDUCTORS
元件分類: 消費家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝: 10 X 10 MM, 1.40 MM, PLASTIC, MS-026, SOT-314-2, LQFP-64
文件頁數: 10/52頁
文件大小: 207K
代理商: TZA1031HL
2002 Jun 06
18
Philips Semiconductors
Product specication
Signal processing IC for DVD rewriteable
TZA1031
7.2.3
FOC BLOCK: FOCUS SERVO SIGNAL NORMALIZATION
A schematic representation of the FOC circuit is shown in Fig.8.
The normalized focus error signal FEN is based on either 2 or 4 input currents, defined by FEN4/2. If FEN4/2 = 1, then
4 input currents are used. The normalization blocks (N) perform the function described in equation (1) in Section 7.2.2.
An offset can be applied which depends on the state of r/w (to compensate for chromatic aberration in the optics). If
r/w = 1 (read mode) OFR is used. Finally the polarity of FEN can be reversed by setting PFEN = 1. FEN is available on
output D2 if Q/NE = 0. FEN can also be observed via the MON block.
7.2.4
RAD BLOCK: RADIAL SERVO SIGNAL NORMALIZATION
handbook, full pagewidth
MGW484
0.5
+/
N
V
I
IDOC1
FEN4/2
FEN
V(Q3)
V(Q1)
r/w
PFEN
N
V
I
IDOC1
OFW
OFR
V(Q2)
V(Q4)
Fig.8 FOC block.
handbook, full pagewidth
MGW485
VCAL
XDN
Q6
Q5
V(Q1) to V(Q6)
+/
PXDN
+/
PREN
I/V
RXDN
REN4/2
N
V
I
IDOC3
S4/8, CA/PP
V(Q1) to V(Q6)
N
V
I
IDOC2
S4/8, CA/PP
RFCAL
rf-cal
REN
DPD
+
LPF
CMPP
Fig.9 RAD block.
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