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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： | 21/52頁 |
| 文件大小： | 207K |
| 代理商： | TZA1031HL |
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2002 Jun 06
28
Philips Semiconductors
Product specication
Signal processing IC for DVD rewriteable
TZA1031
The BETA block measures of the input signal rf the average level CALF and the top and bottom peak levels A1 and A2.
Using rf-beta1 = rf-beta2 = rf, the signal relations for the BETA block are given in equations (13), (14) and (15).
(13)
(14)
(15)
The DC gain from (RFP
RFN) to A1, A2 and CALF is given by:
and can be controlled via the parameter IBS. The typical value of Vbeta is 1.25 V.
7.7
BCA
7.7.1
BURST CUTTING AREA SIGNAL PROCESSING CIRCUIT
The BCA block filters the incoming signal rf-bca after which a comparator compares it with a programmable threshold
level BCATH. The low-pass filter is modelled after a target filter Ht(s) which is given in equation (16).
(16)
Where
ω
0(BCA) =2 ×π× f0(BCA) is a fixed frequency of 300 kHz. Control bit BCAEN allows the BCA circuit to be enabled
(BCAEN = 1) or disabled (BCAEN = 0). If BCAEN = 0 the output signal remains LOW, irrespective of the input signals.
CALF
LPF(rf)
I
BS
------------------
V
beta
×
=
A1
rf
LPF(rf)
–
()
peak
I
BS
-------------------------------------------
V
beta
×
=
A2
LPF(rf)
rf
–
()
peak
I
BS
-------------------------------------------
V
beta
×
=
G
beta
V
beta
I
BS
R
rf
×
---------------------
=
handbook, full pagewidth
MGW494
LPF
comp
BCAEN
D/S
BCA
BCAT
bca-rfp
bca-rfn
Fig.18 BCA circuit.
H
t s
()
1
s
2
ω
0(BCA)
2
---------------------
s
Q
1
ω
0(BCA)
×
--------------------------------
++
-----------------------------------------------------------------------
1
s
2
ω
0(BCA)
2
---------------------
s
Q
2
ω
0(BCA)
×
--------------------------------
++
-----------------------------------------------------------------------
×
=
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