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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)： | 19/52頁 |
| 文件大?。?/td> | 207K |
| 代理商： | TZA1031HL |
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2002 Jun 06
26
Philips Semiconductors
Product specication
Signal processing IC for DVD rewriteable
TZA1031
7.5.2
DYE MEDIA
For dye media the first method (ALF1/2 = 1) uses a circuit where the absorption area is measured by integrating the
difference between the peak level of the returning signal rf and rf itself during a period determined by the HIGH level of
AINTON. A part of that area is used for ALFA by sampling it at the trailing edge of ASTROBE, which occurs before the
trailing edge of AINTON. This results in an effective integration period T. The resulting signal is optionally normalized on
the disc reflection signal CAN. Method 1 produces an energy quantity alfa-dye, expressed in [J]/sample. The transfer
functions defining alfa-dye for the first method are shown below. The parameter NDYE controls the normalization of the
signal.
For NDYE = 0:
(5)
For NDYE = 1:
(6)
IAT and IAN are parameters set via a 3-wire interface register.
IAR is a drop-out concealed version of IAN.
IAR =IAN if CAN > IAT; IAR =IAN × CAN/IAT if CAN ≤ IAT.
It should be noted that if NDYE = 0 the drop-out concealment acts as a programmable gain. The integrator capacitor
CA =ANC0, with AN =2AN and C0 a fixed reference value of 50 pF, can be programmed to match the integration time Tα
associated with the applied writing speed.
The second method (ALF1/2 = 0) for dye media measures the absorption area by directly integrating and sampling the
returning write pulse, then normalizing it on the actual laser peak write power LASP, and after an optional normalization
on the disc reflection signal CAN, subtracting the result from a reference current IA2. Method 2 produces a dimension
less relative alfa-dye, expressed as a ratio of the non-writing pulse area. The corresponding relations for alfa-dye are
shown in equations (7) and (8).
For NDYE = 0:
(7)
For NDYE = 1:
(8)
Here IA2 serves as a reference current that represents the peak level of rf normalized on the write power LASP and the
reflection signal CAN. Because IA2 is not accurately known in advance, it must be calibrated (outside the device) to yield
alfa-dye = 0 if pit formation is absent.
7.5.3
PHASE CHANGE MEDIA
For phase change media the produced alfa is either proportional to ‘P
× R’ or to ‘P√R’, where P is the optical power and
R is the reflection. These quantities are measures of the laser power incident on the recording layer. There are two
methods defined. The first method (ALF1/2 = 1) uses the satellite spots to measure the disc reflection. The reflection
signal is the satellite-sum signal satsum, normalized on the sampled power signal SLASP. If SQRT = 1 a square-root
operation is applied and the result is multiplied by LASP to give alfa-pc. The relations for alfa-pc are shown in
equations (9) and (10).
alfa-dye
G
d
1
C
A
-------
×
rf
PEAK
rf
–
()
Tα
∫
×
dt
×
I
AN
I
AT
--------
×
=
alfa-dye
G
d
1
C
A
-------
×
rf
PEAK
rf
–
()
Tα
∫
×
dt
×
I
AR
CAN
------------
×
=
alfa-dye
I
A2
G
d
1
C
A
-------
×
rfdt
Tα
∫
I
ref1
LASP
---------------
×
I
AN
I
AT
--------
×
–
=
alfa-dye
I
A2
G
d
1
C
A
-------
×
rfdt
Tα
∫
×
I
ref1
LASP
---------------
×
I
ref2
CAN
------------
×
–
I
AR
I
ref2
---------
×
=
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