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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)： | 13/48頁 |
| 文件大?。?/td> | 199K |
| 代理商： | TZA1035HL |
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2003 Jun 03
13
Philips Semiconductors
Preliminary specification
High speed advanced analog DVD signal
processor and laser supply
TZA1035HL
7.2.4
D
IFFERENTIAL PHASE DETECTION
The TZA1035HL provides differential phase detection to
support DVD in various ways:
DPD2withfourchannelsprogrammedtobeactivegives
DPD as required in the standard specification
Two of the four channels can be excluded from the DPD
for pick-ups with an alternative photodiode arrangement
An increase in performance, dedicated for DVD+RW,
can be obtained by using the DPD4 method. Then two
truly separated phase detectors are active. After the
phase detection of the two input pairs the result is
summed.
InputsignalsforDPDaretakenfrominputpins A to Dafter
thefirst gain stage G
1
(seeFig.3). Pre-emphasis is applied
by means of a programmable lead/lag filter. Additionally, a
programmable low-pass filter is available to improve the
signal quality under noisy signal conditions at lower
speeds. For further signal improvements the DPD pulse
stretcher can be programmed to higher values at lower
speeds.
The DPD signal is low-pass filtered by two internal
capacitors. The signal is then fed to pins S1 and S2, or
directedviathedrop-outconcealmentcircuittotheoutputs
(see Section 7.5).
7.2.4.1
Drop-out concealment
A special function is built in for compatibility with drop-out
detection strategies, based on level detection in the
S1 and S2 signals. When using DPD in a fundamental
way, there is no representation of mirror level information
from the light pen.
When the drop-out concealment function is enabled
(bit DOCEN = 1), a portion of the Central Aperture (CA)
signal is added to S1 and S2. Also, when the CA signal
drops below the DOC threshold, the DPD signal is
gradually attenuated.
The DPD detection cannot 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.
For details see Section 7.5.5.2
7.2.4.2
Push-pull and three-beam push-pull
The TZA1035HL can also provide radial information by
means of push-pull signals (from the photodiode inputs) or
in a three-spot optical system with Three-Beam Push-Pull
(TBPP). The built-in multiplexer gives a flexible method of
dealing with many detector arrangements. For push-pull,
the input signals are taken from channels A to D. There is
also a command that switches off channels B and C,
leaving channels A and D for push-pull
(bits RT_mode[2:0]).
ForTBPP,theinput signalistakenfrom channelsE and F,
irrespective of bit RFSUM setting.
7.2.4.3
Enhanced push-pull (dynamic offset
compensation for beam landing)
Thisoptioncancelsoffsetsduetobeamlanding.Afactor
α
can be programmed to re-balance the signal gain between
channels S1 and S2. In a simplified form this can be
described as:
S1 = A
LFR
× α ×
input left
S2 = A
LFR
×
(2
α
)
×
input right.
Factor
α
can be programmed in a range from 0.6 to 1.35,
with 1.0 as the balanced condition (bits
α
[3:0]).
7.2.4.4
Offset compensation
A provision is made to compensate electrical offset from a
light pen. The offset voltage from the light pen can be
positiveornegative.Ingeneral,theoffsetbetweenanytwo
channels is smaller than the absolute offsets. As negative
input signals cannot be handled by the TZA1035HL
internal servo channels, a two-step approach is adopted:
A coarse DAC, common to all the input channels, adds
an offset that shifts the input signals in positive direction
until all inputs are
≥
0. The DAC used (LF
OFFS
) has a
2-bit resolution (bits LF
OFF
[1:0]).
A fine setting per channel is provided to cancel the
remainder of the offset between the channels. This is
achieved by DACs subtracting the DC component from
thesignalsandbringingtheinputstoapproximatelyzero
offset (within
≈
1 mV). The DACs (registers 11 to 13)
have a 4-bit resolution.
The range of both DACs can be increased by a factor of
three to compensate for higher offset values by means of
control parameter bit SERVOOS.
With a switched-off laser, the result of the offset
cancellation can be observed at each corresponding
output pin, OA to OD, S1 and S2, or via a built-in
multiplexer to pin OCENTRAL (central channels only).
See registers 11 to 13 for DAC and multiplexer control.
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