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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： | 17/52頁 |
| 文件大小： | 207K |
| 代理商： | TZA1031HL |
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2002 Jun 06
24
Philips Semiconductors
Product specication
Signal processing IC for DVD rewriteable
TZA1031
The RF-AMP produces four derivative rf-signals for use in
other circuits. They are sent as rf-beta1, rf-beta2, rf-norm
and rf-alfa to the BETA, NORM and ALFA blocks. The
outgoing signals are offset-compensated rf-currents
defined by:
The offset voltage ORF is set via the serial bus to obtain
rf = 0 if the laser is off. This offset is calibrated by
measuring voltage rf-cal via the XDN output. The
rf calibration signal is biased at a reference voltage Vref,
which can be measured separately by setting ZCAL = 1.
During offset calibration it must be kept in mind that the
rf-cal output can only be positive. Negative offsets can be
present in the system but will not be visible on the rf-cal
output, which will not go below Vref. The behaviour of rf-cal
is illustrated in Fig.14.
The balanced voltages bca-rfp and bca-rfn are derived as
well as input for the BCA circuit.
rf
a
O
RF
+
R
rf
------------------------
=
MGW490
handbook, halfpage
rfa (V)
Vref
rf-cal
(V)
Fig.14 Output of rf-cal.
7.4
PP-AMP
7.4.1
PUSH-PULL CHANNEL AMPLIFIER AND FILTERING
The input current PPN is converted into a voltage and then the gain is set by GPP, which is controlled via the serial bus
(see Fig.15). The bandwidth of the output signal is determined by a 1st-order Low-Pass Filter (LPF) which is controlled
by parameter BWPP.
handbook, full pagewidth
MGW491
LPF
BWPP
GPP
I/V
PPNO
PPN
Fig.15 PP-AMP circuit.
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