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TEF6862 データシート(PDF) 31 Page - NXP Semiconductors

部品番号. TEF6862
部品情報  Car Radio Enhanced Selectivity Tuner (CREST)
ダウンロード  65 Pages
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メーカー  PHILIPS [NXP Semiconductors]
ホームページ  http://www.nxp.com
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TEF6862 Datasheet(HTML) 31 Page - NXP Semiconductors

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TEF6862_1
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 01 — 14 September 2006
31 of 65
Philips Semiconductors
TEF6862
Car Radio Enhanced Selectivity Tuner (CREST)
8.2.10 Write mode: data byte IFCF
8.2.11 Write mode: data byte IFCAP
The fully integrated IF2 filter of the TEF6862 has to be aligned in order to achieve the
optimum performance at all ambient conditions. The following procedure is used for a
correct factory alignment.
Table 44.
LEVEL - data byte 7h bit description
Bit
Symbol
Description
7 to 3
LST[4:0]
level start voltage alignment
2 to 0
LSL[2:0]
level slope alignment
Table 45.
IFCF - data byte 8h bit allocation with default setting
7
6
5
4
3
2
1
0
IFCFA
IFWB
IFCF5
IFCF4
IFCF3
IFCF2
IFCF1
IFCF0
00100000
Table 46.
IFCF - data byte 8h bit description
Bit
Symbol
Description
7
IFCFA
FM IF filter alignment
0 = standard operation
1 = alignment mode: fast settling of IF filter (decoupling of the time
constant capacitor at VTCENTRE), IFCAP auto-correction disabled
and reset
6
IFWB
FM IF filter narrow
0 = standard operation
1 = alignment mode: FM IF filter at 20 kHz bandwidth
5 to 0
IFCF[5:0]
FM IF filter center frequency alignment
Table 47.
IFCAP - data byte 9h bit allocation with default setting
7
6
5
4
3
2
1
0
IFCAPA
0
0
0
IFCAP3
IFCAP2
IFCAP1
IFCAP0
01
0
0
0
Table 48.
IFCAP - data byte 9h bit description
Bit
Symbol
Description
7
IFCAPA
FM IF filter capacitor alignment enable
0 = standard operation
1 = alignment and initialization mode: IFCAP auto-correction
disabled and reset
6 to 4
-
not used, must be set to logic 0
3 to 0
IFCAP[3:0]
alignment of FM IF filter capacitor value (use read bit IFCAPG)


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