參數(shù)資料
型號(hào)： TDA9874APS
廠(chǎng)商： NXP SEMICONDUCTORS
元件分類(lèi)： 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(yè)數(shù)： 54/68頁(yè)
文件大?。?/td> 231K
代理商： TDA9874APS
1999 Dec 03
54
Philips Semiconductors
Preliminary specification
Digital TV sound demodulator/decoder
TDA9874A
Table 78
Description of the NISR bits; notes 1 and 2
Notes
1.
The TDA9874A does not support the extended control modes. Therefore, the program of the first sound carrier
(i.e. FM mono or AM) is selected for reproduction in case bit C3 is set HIGH, independent of bit AMUTE in the NICAM
configuration register being set or not.
When a NICAM transmitter is switched off, the device will lose synchronization. In that case the program of the first
sound carrier is selected for reproduction, independent of bit AMUTE being set or not.
2.
10.4.3
NICAM E
RROR
C
OUNT
R
EGISTER
(NIECR)
Bits B7 to B0 contain the number of errors occurring in the previous 128 ms period. The register is updated every
128 ms.
Table 79
NICAM error count register (subaddress 2)
10.4.4
D
ATA
R
EGISTERS
(DR1
AND
DR2)
The contents of these two registers provide information on the additional data bits. AD byte 0 is stored at subaddress 3.
Table 80
Data register 1 (subaddress 3)
Table 81
Description of the DR1 bits
Table 82
Data register 2 (subaddress 4)
BIT
SYMBOL
DESCRIPTION
7
6
5
4
3
C4
C3
C2
C1
OSB
NICAM application control bits:
these bits correspond to the control bits C1 to C4 in
the NICAM transmission.
Synchronization bit:
when OSB = 1, it indicates that the device has both frame and C0
(16 frame) synchronization. When OSB = 0, it indicates that the audio output from the
NICAM part is digital silence.
Configuration change:
when CFC = 1, it indicates a configuration change at the
16 frame (C0) boundary
Identification of NICAM stereo:
when S/MB = 1, it indicates stereo mode
Identification of NICAM dual mono:
when D/SB = 1, it indicates dual mono mode.
2
CFC
1
0
S/MB
D/SB
7
6
5
4
3
2
1
0
B7
B6
B5
B4
B3
B2
B1
B0
7
6
5
4
3
2
1
0
AD7
AD6
AD5
AD4
AD3
AD2
AD1
AD0
BIT
SYMBOL
DESCRIPTION
7 to 0
AD7 to AD0
The lower 8 bits of the additional data word.
7
6
5
4
3
2
1
0
OVW
SAD
CI1
CI2
AD10
AD9
AD8
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