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參數(shù)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(shù)： | 13/52頁 |
| 文件大?。?/td> | 207K |
| 代理商： | TZA1031HL |
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2002 Jun 06
20
Philips Semiconductors
Product specication
Signal processing IC for DVD rewriteable
TZA1031
7.2.6
CANORM BLOCK:CA SIGNAL NORMALIZATION CIRCUIT
handbook, full pagewidth
MGW487
4.0
1/7
18.0
MIR1/2
RS
srf
MIRN
PW
INA
SLASP
IMIR
rf-norm
LPF2
MIR1/2
mir
satsum
IPR
LASP
r/w
VARP
ALF1/2
I01
CAN
I0
RS
LPF2
Fig.11 CANORM block.
When RS is active, rf = rf-norm is sampled and filtered
and then normalized on the laser power (see Fig.11).
When rf is sampled and filtered, LASP must be sampled
and filtered too, in order to obtain a quotient which is a
normalized reflection signal free of EFM. The signals srf
and SLASP are the sampled and filtered versions of rf and
LASP, respectively, which are used in the ALFA block. For
dye media the laser power does not vary during sampling,
while LASP does. In those situations a reference current
IPR is used as a read power reference. A copy of CAN is
sent to the MON block. The signal AIN is used for reflection
measurement in the ALFA block. It is either based on
central spot detection (ALF1/2 = 0) or on satellite spot
detection (ALF1/2 = 1). In the former case sampling during
the erase period of rf-norm takes place using RS, in the
latter case sampling is done in the TZA1030.
The mirror signal mir must be normalized on the laser
power. When Q1 to Q6 are sampled and filtered (in the
TZA1030), mir is sampled and filtered too and hence LASP
must be sampled and filtered also, in order to obtain a
quotient MIRN which is a normalized reflection signal free
of EFM. In some situations the laser power does not vary
during sampling, while LASP does. In those situations a
reference current IPR is used as a read power reference. If
the signals Q1 to Q6 are not sampled during write in the
TZA1030, the mirror signal MIRN must be based on rf,
which is selected by setting MIR1/2 to 0. MIRN is sent as
S1 to the output if Q/NE = 0, a copy is sent to the MON
block. The output current PW is derived from the input
current LASP and is used for power calibration purposes.
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