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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)： | 30/69頁 |
| 文件大?。?/td> | 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
36 of 69
Philips Semiconductors
TZA1047
Preprocessor IC for CD and DVD rewritable
When signal RS is active, signal rf-norm is sampled and ltered and then normalized to
the laser power. When rf-norm is sampled and ltered, externally sourced signal LASP
must also be sampled and ltered in order to obtain a quotient which is a normalized
reection signal free of EFM. Signals srf and SLASP are the sampled and ltered versions
of rf-norm and LASP, respectively, which are used in the ALFA block. The lter corner
frequency is selectable by bit BWRS. For high speeds, the ngerprint correction loop has
to be faster than at low write speeds. For dye media, the laser power does not vary during
sampling, however, the LASP signal does vary during sampling. In these situations, a
reference current IPR is used as a read power reference. Signal srf is also used to produce
the disc reection signal CAN via a divider circuit which is routed to the DOC and MON
blocks.
A test mode is entered by setting bit CANtest to logic 1. CANtest is controlled from the
TEST block via register TST[2:0], bit CANtest is logic 1 if TST[2:0] = 001. In this mode,
signal CAN can be forced externally via pin TEST (signal CANT). This mode can be used
to facilitate debugging and testing of the DOC and ALFA blocks without having to set-up
an RF signal input.
Mirror signal mir must be normalized to the laser power. Signal mir is derived from signals
Q1 to Q6 which have been sampled and ltered in the Input circuit. Because signal mir is
already sampled and ltered, signal LASP must also be sampled and ltered in order to
produce a quotient signal MIRN which is a normalized reection signal free of EFM. In
some situations the laser power does not vary during sampling, while LASP does. In those
situations, a reference current IPR is used as a read power reference. Signal IPR should be
used in writing modes for which the LASP input signal is carrying ALFA information (e.g.
reection control for phase change media writing). This is because if ALFA information is
used in the calculation instead of a xed reference power, it would render the result of the
block invalid. If signals Q1 to Q6 are not sampled during write, the mirror signal MIRN
must be based on rf-norm, which is selected by setting bit MIR1/2 to logic 0. If bit
Q/NE = 0, signal MIRN is routed as signal S1 to the output, and is also routed to the MON
block for test purposes.
7.11.7 Output current polarities
The currents TLN, REN, FEN and XDN are bipolar currents, and if bit Q/NE = 0, are
routed to servo current outputs D2, D3, D4 and S2 respectively. The current MIRN is
unipolar, and if bit Q/NE = 0, is routed to servo current output S1. It is negative according
to the denition used in this document, i.e. sourced by TZA1047. The internal servo
currents Q1 to Q6 are unipolar currents, and if bit Q/NE = 1, are routed directly to D1 to
D4, S1 and S2, and are sourced by the TZA1047.
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