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參數(shù)資料
| 型號： | 935263704557 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO DEMODULATOR, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁數(shù)： | 19/71頁 |
| 文件大?。?/td> | 304K |
| 代理商： | 935263704557 |
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2000 Aug 04
26
Philips Semiconductors
Product specication
Digital TV sound demodulator/decoder
TDA9874A
7.3.7
DEMODULATOR CONFIGURATION REGISTER
This register should not be used when applying ESP. The default setting after Power-on reset is 0000 0000.
Table 24 Demodulator conguration register (subaddress 9)
Table 25 Description of the demodulator conguration register bits
Table 26 Identication mode
Table 27 Channel 2 receive mode
76543210
IDMOD1
IDMOD0
IDAREA
FILTBW1
CH2MOD1
CH2MOD0
FILTBW0
CH1MODE
BIT
SYMBOL
DESCRIPTION
7
IDMOD1
Identication mode for FM sound: these bits dene the integrator time of the
FM identication. A valid result may be expected after twice this time has expired, at the
latest. The longer the time, the more reliable the identication; see Table 26.
6
IDMOD0
5
IDAREA
Application area for FM identication: if bit IDAREA = 1 it selects the FM identication
frequencies in accordance with the specication for Korea. If bit IDAREA = 0 the
frequencies for Europe are selected (B/G and D/K standard).
4
FILTBW1
this bit selects the lter bandwidth in accordance with Table 28
3
CH2MOD1
Channel 2 receive mode: these bits control the hardware for the second sound carrier in
accordance with Table 27. The NICAM mode employs a wider bandwidth of the
decimation lters than the FM mode.
2
CH2MOD0
1
FILTBW0
this bit selects the lter bandwidth in accordance with Table 28
0
CH1MODE
Channel 1 receive mode: if bit CH1MODE = 1 it selects the hardware for the rst sound
carrier to operate in AM mode. If bit CH1MODE = 0 the FM mode is assumed. This
applies to both terrestrial and satellite FM reception.
IDMOD1
IDMOD0
IDENTIFICATION MODE
0
slow
0
1
medium
1
0
fast
1
off/reset, recommended during use of high deviation mode
CH2MOD1
CH2MOD0
CHANNEL 2
00
FM
01
AM
1
0
NICAM
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