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參數資料
型號: TZA1031HL
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, 1.40 MM, PLASTIC, MS-026, SOT-314-2, LQFP-64
文件頁數: 20/52頁
文件大小: 207K
代理商: TZA1031HL
2002 Jun 06
27
Philips Semiconductors
Product specication
Signal processing IC for DVD rewriteable
TZA1031
For SQRT = 0:
(9)
For SQRT = 1:
(10)
The second method for phase change media (ALF1/2 = 0) uses the signal from the central spot rather than from
satellite spots to measure the disc reflection. The reflection signal is the sampled rf-signal srf, normalized on the sampled
power signal SLASP.
For SQRT = 0:
(11)
For SQRT = 1:
(12)
7.5.4
ALFA CIRCUIT GENERAL
The ALFA circuit is enabled by setting bit ENALF = 1. For ENALF = 0 the ALFA output current remains zero. A copy of
the ALFA output current is sent to the MON block. The polarity of the ALFA output current is negative, i.e. the current is
sourced by the device.
7.6
BETA
7.6.1
BETA MEASUREMENT CIRCUIT FOR WRITE POWER CALIBRATION
alfa-pc
I
AN
I
ref2
---------
satsum
9
SLASP
×
-----------------------------
×
LASP
×
=
alfa-pc
I
AN
I
ref2
---------
satsum
9
SLASP
×
-----------------------------
×
LASP
×
=
alfa-pc
I
AN
I
ref2
---------
srf
4
SLASP
×
-----------------------------
×
LASP
×
=
alfa-pc
I
AN
I
ref2
---------
srf
4
SLASP
×
-----------------------------
×
LASP
×
=
handbook, full pagewidth
Vbeta
rf-beta2
rf-beta1
MGW493
PEAK
DETECTOR
BCTL
IBS
CA1
+
A1
Vbeta
LPF
BCTL
CCALF
CALF
Vbeta
PEAK
DETECTOR
BCTL
CA2
+
A2
Fig.17 BETA circuit.
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