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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)： | 32/68頁 |
| 文件大小： | 231K |
| 代理商： | TDA9874APS |
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1999 Dec 03
32
Philips Semiconductors
Preliminary specification
Digital TV sound demodulator/decoder
TDA9874A
10.3.4
M
ONITOR
S
ELECT
R
EGISTER
(MSR)
This register is used to define the signal source (the level of which is to be monitored) and the signal channel. Data can
be monitored e.g. before or after the DC filter at the FM/AM demodulator outputs. The peak level of signals can also be
observed. The last available data sample can be read out in the I
2
C-bus slave transmitter mode (see Section 10.4.5).
Phase means the differentiated phase output of the FM demodulator and is provided when the demodulator operates in
FM mode. The magnitude is supplied in AM mode.
The default setting after power-on reset is ‘0000 0000’.
Table 19
Monitor select register (subaddress 2)
Table 20
Description of the MSR bits
7
6
5
4
3
2
1
0
PEAK
0
0
MCSM1
MCSM0
0
MSS1
MSS0
BIT
SYMBOL
DESCRIPTION
7
PEAK
Peak level select:
when PEAK = 1 it selects the rectified peak level of a source to be
monitored. Peak level value is reset to logic 0 after read-out (see read registers
5 and 6). After changing the monitor signal source for peak calculation it is advisable to
ignore the first read-out value due to stored data from previous calculations.
these 2 bits are not used and should be set to logic 0
6
5
4
3
2
1
0
MCSM1
MCSM0
MSS1
MSS0
Signal channel select:
the state of these 2 bits determine which signal channel is
selected; see Table 21.
this bit is not used and should be set to logic 0
Signal source select:
the state of these 2 bits determine which signal source is
selected; see Table 22.
Table 21
Signal channel selection
Table 22
Signal source selection
MCSM1
MCSM0
SIGNAL CHANNEL
0
0
0
1
1
0
CH1
CH2
CH1
CH2
+
2
MSS1
MSS0
SIGNAL SOURCE
0
0
DC output of FM/AM
demodulator
magnitude/phase output
of FM/AM demodulator
FM/AM path output
NICAM path output
0
1
1
1
0
1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA9874H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV sound demodulator/decoder |
| TDA9875 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV Sound Processor DTVSP |
| TDA9875A | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV Sound Processor DTVSP |
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