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參數(shù)資料
| 型號(hào)： | TZA1047HL/M3 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費(fèi)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(yè)數(shù)： | 9/69頁(yè) |
| 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
17 of 69
Philips Semiconductors
TZA1047
Preprocessor IC for CD and DVD rewritable
7.6.3 Single-ended current path
Apart from the RF output signal, the RF amplier also produces four identical derivative rf
signals in the current domain for use in other circuits. They are called rf-beta1, rf-beta2,
rf-norm and rf-cal, and are routed to blocks BETA and Normalizer and to the XDN output.
The outgoing signals are offset-compensated rf-currents:
The offset voltage VOO(RF) is set via the I2C-bus interface. In read mode (r/w = 1), VOO(RF)
is controlled by OFFRF[5:0]. In write mode (r/w = 0), VOO(RF) is controlled by
OFFRFW[5:0]. Voltage VRFa is the output voltage of the rst output stage across rfp and
rfn; Rrf is the RF V-to-I conversion resistance. Separate offset settings for read and write
are necessary because the combined offset of PDIC and the TZA1047 RF path will be
different in read and write modes. Read and write modes use different gain settings set by
GRFR[3:0] and GRFW[3:0], so an offset at the input to the DC-control block will have a
different effect on VRFa in read and write mode.
The offset is calibrated by measuring the voltage of the calibration signal rf-cal via the
output at pin XDN with the laser off. Avoid adding other rf currents as they may
signicantly increase the offset since it is assumed that all rf currents are offset-free after
calibration of rf-cal.
The control signal RFItest is intended only for test and evaluation purposes. It is set by
I2C-bus control bits TST[2:0]. For normal operation these bits should all be set to logic 0.
rf
V
RFa
V
OO RF
()
+
R
rf
-----------------------------------------
=
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