參數(shù)資料
型號(hào)： TDA9874H
廠商： 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, PQFP44
封裝： 14 X 14 MM, 2.20 MM HEIGHT, PLASTIC, SOT-205-1, QFP-44
文件頁(yè)數(shù)： 28/56頁(yè)
文件大?。?/td> 254K
代理商： TDA9874H
1998 Apr 27
28
Philips Semiconductors
Preliminary specification
Digital TV sound demodulator/decoder
TDA9874H
7.3.11
NICAM C
ONFIGURATION
R
EGISTER
(NCONR)
The default setting at power-up is 00000000.
Table 34
NICAM Configuration Register (subaddress 14)
Table 35
Description of NCONR bits
7.3.11.1
Notes
The decision of whether auto-muting is permitted shall be taken by the controlling microprocessor based on information
contained in the TDA9874H’s status registers. Thus, it depends on the strategy implemented in the software whether the
auto-mute function is in accordance with “NICAM 728 ETS Revised for Data Applications”or any other preference.
The NICAM de-emphasis gain is 0 dB at 40 Hz.
The AMSEL bit has only an effect on the analog sound outputs (OUTL and OUTR). With regard to the digital sound
output (I
2
S), the auto-mute will only switch between NICAM and the first sound carrier.
When carrier 2 is in FM mode, the TIMPOL bit should be set HIGH, to achieve the best S/N performance with the current
oscillator application proposal (see Chapter 9).
7
6
5
4
3
2
1
0
TIMPOL
DOUTEN
AMSEL
NDEEM
AMUTE
BIT
SYMBOL
TIMPOL
DESCRIPTION
7
6
5
These 2 bits are not used and should be set to logic 0.
Timing loop polarity.
TIMPOL = 1, inverts the polarity. This feature can be used to
compensate for the phase shift that is introduced by an external inverting amplifier at
the pin V
tune
. Such an amplifier could be used to provide a larger tuning voltage swing
for the VCXO. TIMPOL = 0, sets the NICAM timing loop to normal polarity.
Data output enable.
DOUTEN = 1, enables the output of the NICAM serial data stream
from the DQPSK demodulator and of the associated clock, PCLK. DOUTEN = 0, both
outputs will be 3-stated.
This bit is not used and should be set to logic 0.
Auto-mute select.
AMSEL = 1, the auto-mute will switch between NICAM sound and
the analog mono input. This bit has only an effect when the auto-mute function is
enabled and when the DAC has been selected in the Analog Output Select Register
(see Section 7.3.17). AMSEL = 0, the auto-mute will switch between NICAM sound and
the sound on the first sound carrier (i.e. FM mono or AM).
De-emphasis on/off.
NDEEM = 1, switches the NICAM J17 de-emphasis off.
NDEEM = 0, switches the NICAM J17 de-emphasis on.
Auto-muting on/off.
AMUTE = 1, automatic muting is disabled. This bit has only an
effect, when the second sound carrier is set to NICAM. AMUTE = 0, enables the
automatic switching between NICAM and the program on the first sound carrier (i.e. FM
mono or AM), dependent on the NICAM bit error rate.
4
DOUTEN
3
2
AMSEL
1
NDEEM
0
AMUTE
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