參數(shù)資料
型號(hào)： TDA9875
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： Digital TV Sound Processor DTVSP
中文描述： SPECIALTY CONSUMER CIRCUIT, PDIP64
文件頁(yè)數(shù)： 43/92頁(yè)
文件大?。?/td> 279K
代理商： TDA9875
1998 Feb 13
43
Philips Semiconductors
Preliminary specification
Digital TV Sound Processor (DTVSP)
TDA9875
10.3.11.2 Description
Table 32
Description of Table 31 (notes 1, 2 and 3)
Notes
1.
The decision of whether auto-muting is permitted shall be taken by the controlling microcontroller based on
information contained in the TDA9875’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.
In FM mode of sound carrier 2, the TIMPOL bit can be used to switch pin V
tune
HIGH or LOW.
2.
3.
10.3.12 NICAM
OUTPUT LEVEL ADJUST REGISTER
10.3.12.1 Description
This register is used to correct for standard and station-dependent differences of signal levels. Table 33 applies to both
NICAM sound outputs.
10.3.12.2 Definition
Table 33
Subaddress 15 (notes 1 and 2)
NAME
HIGH/LOW
FUNCTION
AMUTE
HIGH
Automatic muting is disabled. This bit has only an effect when the second sound
carrier is set to NICAM.
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
switches the NICAM J17 de-emphasis off
switches the NICAM J17 de-emphasis on
enables the output of the NICAM serial data stream from the DQPSK demodulator
and of the associated clock, PCLK
both outputs will be 3-stated
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.
sets the NICAM timing loop to normal polarity
LOW
NDEEM
HIGH
LOW
HIGH
DOUTEN
LOW
HIGH
TIMPOL
LOW
MSB
LSB
GAIN SETTING
(dB)
B7
B6
B5
B4
B3
B2
B1
B0
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
1
1
1
1
0
0
0
0
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
+15
+14
+13
+12
+11
+10
+9
+8
+7
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