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)： 43/68頁
文件大?。?/td> 231K
代理商： TDA9874APS
1999 Dec 03
43
Philips Semiconductors
Preliminary specification
Digital TV sound demodulator/decoder
TDA9874A
10.3.17 S
TEREO
DAC O
UTPUT
S
ELECT
R
EGISTER
(SDACOSR)
This register is used to define the signal source to be
entered into the DAC. The stereo DAC output can be
routed to the analog stereo output pins, depending on the
setting in the AOSR; see Section 10.3.18.
A simplified setting is possible, if automatic FM dematrix
switching (see Section 10.3.9) and auto-select
(see Section 10.3.18) is applied.
The two combinations of FM and NICAM shown in
Table 50 apply to the (rare) condition that three different
languagesarebeingbroadcastinanFM + NICAMsystem.
They allow for a two-out-of-three selection for special
applications. It should be noted that the controlling
microprocessor has to assure that the FM dematrix is set
to the mono position or that IDSWFM is set HIGH.
An additional Automatic Volume Level (AVL) control
function is implemented, which provides a constant output
level of
23 dB (FS) for input levels between 0 and
29 dB (FS). There are some fixed decay time constants
to choose from, i.e. 2, 4 or 8 s.
The automatic stereo DAC switching, operating similar to
the mono DAC switching, is shown in Table 56.
The default setting after power-on reset is ‘0000 0000’.
Bits 2 and 6 are not used and should be set to logic 0.
Table 47
Stereo DAC output select register
(subaddress 19)
Table 48
Selection of stereo DAC gain
Table 49
AVL control mode
The AVL attack time is always 10 ms.
Table 50
Signal source left and right
The auto-select function is available only if SDOS1 and
SDOS0 are set to ‘00’ or ‘01’. Matrixing can be set in the
analog output select register.
10.3.18 A
NALOG
O
UTPUT
S
ELECT
R
EGISTER
(AOSR)
This register is used to define both the signal source to be
output at the analog outputs and the output channel
selector mode.
The DAC outputs are automatically muted in the event that
one of the analog inputs is selected for output.
The
position of the matrix applies only to the DAC
outputs, it is not available for analog input signals.
The default setting after power-on reset is ‘0000 0000’.
7
6
5
4
3
2
1
0
SDGS1 0
AVL
1
AVL
0
SDGS0 0 SDOS1 SDOS0
SDGS1
SDGS0
DAC GAIN
(dB)
0
0
1
1
0
1
0
1
0
3
6
9
AVL1
AVL0
AVL MODE
0
0
1
1
0
1
0
1
off or reset
short decay (2 s)
medium decay (4 s)
long decay (8 s)
SDOS1
SDOS0
SIGNAL SOURCE STEREO
DAC
LEFT
RIGHT
0
0
1
1
0
1
0
1
FM/AM
NICAM left
FM/AM
FM/AM
FM/AM
NICAM right
NICAM M1
NICAM M2
L
R
+
2
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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
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