參數(shù)資料
型號(hào)： TZA1031HL
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)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(yè)數(shù)： 9/52頁(yè)
文件大?。?/td> 207K
代理商： TZA1031HL
2002 Jun 06
17
Philips Semiconductors
Product specication
Signal processing IC for DVD rewriteable
TZA1031
7.2.1
AUX BLOCK
The input currents Qi (i = 1 to 6) are converted into
voltages V(Qi) = VTln(Qi/IS) for use in the normalizer
circuits ((see Fig.7). Furthermore, AUX produces the
signals Qs, satsum and mir, defined as:
QS =Q1 +Q2 +Q3 +Q4
Satsum = Q5 +Q6
The mir signal is defined in Table 4.
Table 4
The mir signal denition
7.2.2
DOC BLOCK: NORMALIZATION AND DROP-OUT
CONCEALMENT
The blocks FOC, RAD and TL contain normalizer circuits.
A normalizer circuit N with input currents I1 and I2
produces the following dropout-concealed output
current IO:
(1)
where IDOC is a dropout-concealed scaling current that is
chosen according to the modulation depth of the signal to
be normalized, produced by the DOC circuit. The NORM
block has one dropout-concealment circuit that delivers
various currents, IDOC1 through IDOC4, for the normalizer
circuits. The dropout-concealed scale currents IDOCi
(i=1to4) are defined as IDOCi =GDOC × INi, where INi are
programmable reference currents and GDOC is defined by:
GDOC = 1 if CAN > IT
GDOC = CAN/IT if CAN ≤ IT
where IT is the threshold level for dropout-concealment
with which the normalized sum current CAN is compared.
If CAN drops below IT the scale factor GDOC will decrease
linearly with CAN in order to prevent ‘dividing-by-zero’.
There is a threshold ITW for write and a threshold ITR for
read: IT =ITW if r/w = 0, IT =ITR if r/w = 1. The currents INi,
ITW and ITR are programmable via the serial bus.
BIT S4/8
BIT CA/PP
mir
00
Qs
01
Qs
10
Q5 +Q6 +QS
11
Q5 +Q6 +QS
MGW483
handbook, halfpage
AUX
Q1 to Q6
V(Q1) to V(Q6)
mir
satsum
QS
Fig.7 AUX block.
I
O
I
1
I
2
–
I
1
I
2
+
---------------
I
DOC
×
=
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