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| 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(shù)： | 11/52頁 |
| 文件大小： | 207K |
| 代理商： | TZA1031HL |
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2002 Jun 06
19
Philips Semiconductors
Product specication
Signal processing IC for DVD rewriteable
TZA1031
The normalized radial error signal REN is based on either
2 or 4 input currents, defined by REN4/2 and DPD (see
Fig.9). If DPD = 0 and REN4/2 = 0 the associated tracking
method is either 1-spot PP (4 segments), 3-spot CA or
3-spot PP. If DPD = 0 and REN4/2 = 1 the associated
tracking method is 1-spot PP (8 segments). In that case
the offset correction signal obtained from the lower branch
is low-pass filtered before it is added to the main
normalized PP. An external capacitor named CCMPP,
connected to pin CMPP, defines the 3 dB frequency of the
filter. If DPD = 1 the tracking method is DPD and REN is
obtained from the difference of Q5 and Q6. Finally the
polarity of REN is reversed if PREN is set to logic 1.
Additionally, the signal XDN (normalized spot position) is
generated. XDN is either based on 3-spot PP, 1-spot PP
(4 segments) or on 1-spot PP (8 segments). For
RFCAL = 1 the XDN output is used to output an amplified,
low-pass filtered version of the signal rf (see Section 7.3).
This can be used to eliminate the offset in the RF path. It
should be noted that the output of rf-call is unipolar, so
only positive outputs are possible.
7.2.5
TL BLOCK: TRACK LOSS SERVO SIGNAL
If RTLN = 1 the normalized trackless signal TLN is only valid for the tracking methods 3-spot CA and 3-spot PP. For
RTLN = 0 TLN is the low-pass filtered central sum signal QS, scaled with a factor 1/3.
The output of TLN (both positive and negative) can be clamped to a maximum value ICL in order to deal with media that
have a high and low modulation depth of TLN on one disc (e.g. written and blank regions). The clamp can be
enabled/disabled with bit CLMP. The polarity of TLN is reversed by setting PTLN = 1. TLN is sent as D4 to the output if
Q/NE = 0, a copy is sent to the MON block.
handbook, full pagewidth
MGW486
RTLN
QS
CLMP
1/3
+/
TLN
PTLN
V(Q1) to V(Q6)
satsum
N
V
I
IDOC4
CA/PP
CLAMP
X
Fig.10 TL block.
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