TDA9875 Philips Semiconductors, TDA9875 Datasheet - Page 43

• Manufacturer Part Number: TDA9875
• Description: Digital TV Sound Processor DTVSP
• Manufacturer: Philips Semiconductors

Philips Semiconductors
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
2. The NICAM de-emphasis gain is 0 dB at 40 Hz.
3. In FM mode of sound carrier 2, the TIMPOL bit can be used to switch pin V
10.3.12 NICAM
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)
1998 Feb 13
Digital TV Sound Processor (DTVSP)
MSB
DOUTEN
B7
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.
TIMPOL
NDEEM
AMUTE
X
X
X
X
X
X
X
X
X
NAME
B6
X
X
X
X
X
X
X
X
X
OUTPUT LEVEL ADJUST REGISTER
HIGH/LOW
HIGH
HIGH
HIGH
HIGH
LOW
LOW
LOW
LOW
B5
X
X
X
X
X
X
X
X
X
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
could be used to provide a larger tuning voltage swing for the VCXO.
sets the NICAM timing loop to normal polarity
B4
0
0
0
0
0
0
0
0
0
B3
1
1
1
1
1
1
1
1
0
B2
1
1
1
1
0
0
0
0
1
43
B1
1
1
0
0
1
1
0
0
1
FUNCTION
LSB
B0
1
0
1
0
1
0
1
0
1
tune
HIGH or LOW.
tune
GAIN SETTING
Preliminary specification
. Such an amplifier
(dB)
+15
+14
+13
+12
+11
+10
+9
+8
+7
TDA9875