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參數(shù)資料
| 型號： | TDA9874APS |
| 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, PDIP42 |
| 封裝： | 0.600 INCH, SHRINK, PLASTIC, MS-020, SOT-270-1, DIP-42 |
| 文件頁數(shù)： | 36/68頁 |
| 文件大?。?/td> | 231K |
| 代理商： | TDA9874APS |
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1999 Dec 03
36
Philips Semiconductors
Preliminary specification
Digital TV sound demodulator/decoder
TDA9874A
Table 33
De-emphasis
Notes
1.
2.
The FM de-emphasis gain is 0 dB at 40 Hz.
Not used in any known terrestrial TV sound standard. NICAM de-emphasis is selected in the NICAM configuration
register; see Table 41.
10.3.9
FM
DE
M
ATRIX
R
EGISTER
(FMMR)
This register is used to select the proper dematrixing characteristics as appropriate for the standard of the received
carrier and the related sound mode identification. For the dematrixing, it is assumed that the output from sound carrier 1
is on channel 1 input. Bits 3 to 6 are not used.
The default setting after power-on reset is ‘0000 0000’.
Table 34
FM dematrix register (subaddress 11)
Table 35
Description of the FMMR bits
FMDSC23; FMDSC13
FMDSC22; FMDSC12
FMDSC21;FMDSC11
DE-EMPHASIS
(1)
50
μ
s
60
μ
s
75
μ
s
J17
(2)
off
0
0
0
0
1
0
0
1
1
0
0
1
0
1
0
7
6
5
4
3
2
1
0
IDSWFM
0
0
0
0
FDMS2
FDMS1
FDMS0
BIT
SYMBOL
DESCRIPTION
7
IDSWFM
Automatic FM-dematrix switching:
if set to logic 1, the FM dematrix is switched
automatically in dependence on the current FM identification result. In case of stereo,
the type of stereo dematrixing (Europe or Korea) is determined by bit IDAREA in
subaddress 9. Bits FDMS2, FDMS1 and FDMS0 are ignored and the dematrix output is
set according to Table 37. With channel 2 in NICAM mode, mono (channel 1) is always
selected.
these 4 bits are not used and should be set to logic 0
6
5
4
3
2
1
0
FDMS2
FDMS1
FDMS0
Dematrixing characteristics select:
the state of these 3 bits select the dematrixing
characteristics; see Table 36
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