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參數資料
| 型號： | 935263704518 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO DEMODULATOR, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁數： | 36/71頁 |
| 文件大小： | 304K |
| 代理商： | 935263704518 |
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2000 Aug 04
41
Philips Semiconductors
Product specication
Digital TV sound demodulator/decoder
TDA9874A
7.3.22
MONO DAC OUTPUT SELECT REGISTER
(MDACOSR)
This register is used to define the signal source to be
entered into the mono DAC. The mono DAC is used for
signal output from digital sources.
For the mono DAC output auto-matrix switching is always
active.
In stereo mode
is chosen automatically. Selecting
Language B (bits MDOS1 and MDOS0 set to
logic 01 or 11) will only show effect, while a dual
transmission via FM A2 or NICAM is being received.
Settings in the FM dematrix register have no effect on the
source selection for the mono DAC.
The level adjustment for an FM source is determined by
the channel 1 output level adjustment register
(subaddress 12) for mono/dual A, or by the channel 2
output level adjustment register (subaddress 13) for
dual B, or by the NICAM output level adjustment register
(subaddress 15) if a NICAM source is selected.
Some extra gain can be introduced at the input to the DAC
to provide a coarse level adjustment function.
The default setting after Power-on reset is 0000 0000.
Bits 2, 4, 5 and 6 are don’t care and should be set to
logic 0.
LR
+
2
--------------
Table 64 Mono DAC output select register (subaddress 24)
Table 65 Selection of DAC gain
Table 66 Signal source
76543210
MDGS1
0
MDGS0
0
MDOS1
MDOS0
MDGS1
MDGS0
DAC GAIN (dB)
00
0
01
3
10
6
11
9
MDOS1
MDOS0
MONO DAC OUTPUT
00
FM/AM
or mono/dual A
0
1
FM/AM dual B if dual mode transmission, otherwise mono
10
NICAM
or mono/dual A
1
NICAM mono 2 if dual mode transmission, otherwise
mono
LR
+
2
--------------
LR
+
2
--------------
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