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參數(shù)資料
| 型號(hào)： | TZA1035HL |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | High speed advanced analog DVD signal processor and laser supply |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP48 |
| 封裝： | 7 X 7 MM, 1.40 MM HEIGHT, PLASTIC, SOT-313-2, MS-026, LQFP-48 |
| 文件頁數(shù)： | 28/48頁 |
| 文件大小： | 199K |
| 代理商： | TZA1035HL |
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2003 Jun 03
28
Philips Semiconductors
Preliminary specification
High speed advanced analog DVD signal
processor and laser supply
TZA1035HL
The bandwidth of the DPD signal is limited by the 100 kHz
phase detector integration filters and the bandwidth of the
output stages (100 kHz for S1 and S2).
The input signals used for DPD depend on the
programmed radial tracking mode (bits RT_mode[2:0]):
DPD
mode
= DPD2:
(A,D) or DPD2:
(A + C, B + D)
DPD
mode
= DPD4: 0.5[
(A,D) +
(C,B)]
Range of
is from
0.5 to + 0.5.
> 0 if A,C phase leads with respect to D,B phase.
FTC = (S1
S2)
×
(R
FTC
+ FTCREF)
ForS1 and S2bit RAD_polisassumedtobesettologic 1.
Otherwise the signals appearing at S1 and S2 will be
swapped.
7.5.5.2
DPD signals (DVD-ROM mode) with
drop-out concealment
With bit DOCEN = 1, drop-out concealment is activated
and the S1 and S2 outputs change:
Thecommonmodelevel(I
REFRAD
)isnowdeterminedby
the CA signal
The scaling changes.
At low signal levels (SUM < DOC
threshold
), the contribution
t
P
of
is reduced smoothly.
S1
DPD
= C
×
I
(FS)(DPD)(DOC)
×
+ 0.25
×
CA.
S2
DPD
=
C
×
I
(FS)(DPD)(DOC)
×
+ 0.25
×
CA.
Where:
I
(FS)(DPD)(DOC)
is the full scale range
C = concealment multiplier, C = 0 to 1 when CA is
0 to DOC
threshold
CA = OA + OB + OC + OD
DOC
threshold
is typically 3
μ
A.
ForS1 and S2bit RAD_polisassumedtobesettologic 1.
Otherwise the signals appearing at S1 and S2 will be
swapped.
The DPD detection can not work properly when the input
signal becomes very small. The output of the DPD may
then show a significant offset. The DOC may not conceal
this offset completely because:
DOC is gradually controlled from the CA signal
The CA signal may not become 0 during disc-defect.
7.5.5.3
Three-beam push-pull (CD mode)
When the three-beam system is used, the radial signals
S1 and S2 can be composed from inputs E and F.
FTC = (S1
S2)
×
R
FTC
+ FTCREF (bandwidth limited
to 600 kHz).
ForS1 and S2bit RAD_polisassumedtobesettologic 1.
Otherwise the signals appearing at S1 and S2 will be
swapped.
7.5.5.4
Enhanced push-pull
Top hold push-pull method is supported but only in
conjunction with a compatible decoder. The peak hold
function is executed in the decoder, by measuring the
mirror levels of the gap-zones in each header. The
TZA1035HL will compensate for offset errors in two ways:
The DC offset from the pick-up can be compensated by
means of a DAC (C
OFFSx
) in each channel
The dynamic offsets can be compensated by means of
the multiplier ratio
α
.
The correction values must be calculated in the decoder
and programmed via the serial bus. The method is called
the enhanced push-pull method.
ForS1 and S2bit RAD_polisassumedtobesettologic 1.
Otherwise the signals appearing at S1 and S2 will be
swapped.
t
T
P
------
t
T
P
------
t
T
P
------
t
T
P
------
t
T
P
------
t
P
T
T
t
P
T
t
T
P
------
S1
PP
A
LFR
E
---------------------------------------------------------------------R
OPUREF
–
LF
R
LFR
OFFSE
×
=
S2
PP
A
LFR
F
--------------------------------------------------------------------R
OPUREF
–
LF
R
LFR
OFFSF
×
=
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