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參數(shù)資料
| 型號： | TZA1047HL/M3 |
| 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, 1.4 MM HEIGHT, PLASTIC, MS-026, SOT314-2, LQFP-64 |
| 文件頁數(shù)： | 28/69頁 |
| 文件大小： | 324K |
| 代理商： | TZA1047HL/M3 |
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9397 750 14664
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 02 — 1 June 2005
34 of 69
Philips Semiconductors
TZA1047
Preprocessor IC for CD and DVD rewritable
If bit RFCAL = 1, output XDN provides an amplied, low-pass ltered version of signal
rf-cal (see Section 7.6). This can be used to eliminate the offset in the RF path.
Note that the rf-cal output is unipolar, so only positive outputs are possible. If bit
Q/NE = 0, signal XDN (or rf-cal) is output at pin S2.
The relationship between the XDN signal components is shown in Table 18.
Calculation of XDN gain: In TZA1047/M1 XDN was a voltage output on a 1.3 V bias level,
made with a conversion resistance of 80 k
. This was connected to S2 on centaurus1
with a 100 series resistor. The reference voltage on S2 was set to 1.2 V. With a second
resistor, a bias current was added to have a 6
A bias level. (S2 is a 12 A range unipolar
input).
This situation resulted in a full range (6
A) swing with IN3 = 0h so Idoc3 = 16 A.
Calculating back, the modulation on XDN is (6
A × 80/100)/16 A = 30 %. This is more
than expected but will be accepted as a fact of life.
Intermezzo: XDN is used to measure lens position. The beam is 3.5 mm diameter through
the lens, the position shift range required is 0.4mm. This is 11.5 %, but XDN will not be
linear with position because the beam intensity in the middle is higher than at the edges.
Calculation for TZA1047/M2: Assume 30 % modulation. XDN will be connected to D2, a
bipolar input with
±12 A range. The nominal reference current should be
12
× (1/0.3) = 40 A. By using I
N3 =4+4 × IN3, this is achieved at IN3 = 9h which is nicely
in the middle of the range.
7.11.5 Track loss servo signal block (normalizer sub-block)
The TL block produces a normalized track loss error signal TLN. A detailed block diagram
of the TL block is shown in Figure 19.
If bit RTLN = 1, signal TLN is only valid for the tracking methods 3-spot CA and 3-spot PP.
If bit RTLN = 0, signal TLN is the low-pass ltered central sum signal QS, scaled with a
factor of 1
3.
Table 18:
XDN signal (bit PXDN = 0)
Bit S4/8
Bit CA/PP
Bit RFCAL
Signal XDN
0
N[Q5, Q6]
× GDOC × IN3
X
1
0
N[(Q1 + Q3), (Q2 + Q4)]
× G
DOC × IN3
1
0
N[(Q1 + Q3 + Q5), (Q2 + Q4 + Q6)]
× G
DOC × IN3
X
1
rfcal
Fig 19. TL block.
001aab191
+/
PTLN
N
IDOC4
CLAMP
CA/PP
Q5, Q6,
Qsnorm
QSNORM
TLN
TLN to MON
RTLN
CLMP ICL
1/3
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