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參數(shù)資料
| 型號： | 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)： | 27/48頁 |
| 文件大?。?/td> | 199K |
| 代理商： | TZA1035HL |
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2003 Jun 03
27
Philips Semiconductors
Preliminary specification
High speed advanced analog DVD signal
processor and laser supply
TZA1035HL
Switches SW-A to SW-D can be programmed 1,
1 or 0
(respectively pass, invert or not pass the signal) for each
channel. In this way the data can be read by any
combination of diode inputs.
The first gain stage also carries the signals for DPD
tracking. Therefore this stage will also be active when
RFSUM input and DPD is selected. The DC offset
cancellation is also active in this situation but left and right
channels are controlled from a single DAC. Also in this
situation, the A to D and RFSUM inputs are used
simultaneously.
Control of the DC offset DACs can be chosen to be from
the same register or from two independent registers
(registers 4 and 5).
7.5.2
D
ATA SIGNAL PATH THROUGH INPUT PINS
RFSUMP
AND
RFSUMN
With bit RFSUM = 1:
(DVD
RFP
DVD
RFN
) =
A
RFSUM
×
[RFSUMP
RFSUMN
RF
OFFSS
]
RFP = RFREF + 0.5
×
A
3
×
(DVD
RFP
DVD
RFN
)
RFN = RFREF
0.5
×
A
3
×
(DVD
RFP
DVD
RFN
)
Thus:
RF
dif
= A
RFSUM
×
[RFSUMP
RFSUMN
RF
OFFSS
]
7.5.3
HF
FILTERING
The differential HF signal from the G
3
stage is sent to a
filter section that consists of an equalizer and a noise filter,
whicharecontrolledbybits BWRF,RFKEQ,RFEQENand
RFNFEN. The equalizer has a transfer function H
1
(s)
which is modelled after a target transfer function H
e
(s):
This represents a third-order equi-ripple phase filter with a
good delay response. The boost factor k is programmable
via the serial bus control bit RFKEQ. The corner
frequency
ω
0RF
= 2
π
f
0RF
is programmable via control
parameter bit BWRF. The equalizer is switched on with
control bit RFEQEN.
The noise filter has a transfer function H
2
(s) which is
modelledafterathird-orderButterworthlow-passfilterwith
target transfer function H
n
(s):
The corner frequency
ω
0RF
is equal to that of the equalizer
filter. The noise filter is switched on with bit RFNFEN.
7.5.4
F
OCUS SIGNALS
Focus servo signals:
OA =
×
A
LFC
×
(A
OPUREF + LF
OFFS
C
OFFSA
)
+
β ×
F
OFFS
OB =
×
A
LFC
×
(B
OPUREF + LF
OFFS
C
OFFSB
)
+ (1
β
)
×
F
OFFS
OC =
×
A
LFC
×
(C
OPUREF + LF
OFFS
C
OFFSC
)
+
β ×
F
OFFS
OD =
×
A
LFC
×
(D
OPUREF + LF
OFFS
C
OFFSD
)
+ (1
β
)
×
F
OFFS
The parameter
β
can be programmed via the serial bus.
The focus offset DAC can be switched on with the control
bit F
OFFSEN
.
7.5.5
R
ADIAL SIGNALS
7.5.5.1
DPD signals (DVD-ROM mode) with no
drop-out concealment
DPD tracking can be activated with bits RT_mode[2:0] of
register 1. Input signals are taken from the diode inputs
A to D, through the input stage G
1
and the DC offset
cancellation DAC. When bit RFSUM = 0, the input stage is
also used for the RF signal. When bit RFSUM = 1, the
setting for G
1
and DC offset control can be independent of
the setting for the data signal which goes through RFSUM.
t
P
t
P
S1
DPD
= I
(FS)(DPD)
×
+ I
REFRAD
S2
DPD
=
I
(FS)(DPD)
×
+ I
REFRAD
is the time difference between the two input signals,
relative to the period time T
P
of the input signal. I
(FS)(DPD)
is the full scale range.
H
e
s
( )
1
k
+
2
ω
2
-----s
×
1
ω
0RF
2
----s
α
0RF
---s
×
+
+
-------------------------------------------------------
1
τ
0RF
-----s
×
+
-------------1
×
=
H
n
s
( )
1
ω
0RF
2
-----s
0RF
-----s
+
+
---------------------1
1
0RF
-----s
+
----------1
×
=
1
LFC
R
LFC
R
LFC
R
R
LFC
---1
T
T
t
T
P
------
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