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參數(shù)資料
| 型號： | TDA9874H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | Digital TV sound demodulator/decoder |
| 中文描述： | AM/FM, AUDIO DEMODULATOR, PQFP44 |
| 封裝： | 14 X 14 MM, 2.20 MM HEIGHT, PLASTIC, SOT-205-1, QFP-44 |
| 文件頁數(shù)： | 23/56頁 |
| 文件大?。?/td> | 254K |
| 代理商： | TDA9874H |
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1998 Apr 27
23
Philips Semiconductors
Preliminary specification
Digital TV sound demodulator/decoder
TDA9874H
7.3.6
D
EMODULATOR
C
ONFIGURATION
R
EGISTER
(DCONR)
The default setting at power-up is 00000000.
Table 22
Demodulator Configuration Register (subaddress 9)
Table 23
Description of DCONR bits
Table 24
Identification mode
Table 25
Channel 2 receive mode
7.3.6.1
Notes
It is recommended to switch the FM sound mode identification off whenever the received program is not a terrestrial
2-carrier sound. Switching the identification off will reset the associated hardware to a defined state.
7
6
5
4
3
2
1
0
IDMOD1
IDMOD0
IDAREA
CH2MOD1
CH2MOD0
CH1WIDE
CH1MODE
BIT
SYMBOL
DESCRIPTION
7
6
IDMOD1
IDMOD0
Identification mode for FM sound.
These bits define the integrator time of the FM
identification. A valid result may be expected after twice this time has expired, at the
latest. The longer the time, the more reliable the identification. See Table 24.
Application area for FM identification.
IDAREA = 1, selects FM identification
frequencies in accordance with the specification for Korea. IDAREA = 0, frequencies for
Europe are selected (B/G and D/K standard).
This bit is not used and should be set to logic 0.
Channel 2 receive mode.
These bits control the hardware for the second sound carrier
in accordance with Table 25. NICAM mode employs a wider bandwidth of the
decimation filters than FM mode.
Channel 1 bandwidth.
CH1WIDE = 1, switches the decimation filters for the first sound
carrier to a wide bandwidth, so that the main sound carrier of a satellite channel with its
larger deviation can be handled without additional distortion. CH1WIDE = 0, the
bandwidth is narrow to cope with the intermodulation requirements of FM stereo.
Channel 1 receive mode.
CH1MODE = 1, selects the hardware for the first sound
carrier to operate in AM mode. CH1MODE = 0, FM mode is selected. This applies to
both terrestrial and satellite FM reception.
5
IDAREA
4
3
2
CH2MOD1
CH2MOD0
1
CH1WIDE
0
CH1MODE
IDMOD1
IDMOD0
IDENTIFICATION MODE
0
0
1
1
0
1
0
1
slow
medium
fast
off/reset
CH2MOD1
CH2MOD0
CHANNEL 2
0
0
1
0
1
0
FM
AM
NICAM
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