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| 型號： | 93526374518 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | FM, AUDIO DEMODULATOR, PQFP44 |
| 封裝： | PLASTIC, SOT-205, QFP-44 |
| 文件頁數(shù)： | 28/71頁 |
| 文件大小： | 269K |
| 代理商： | 93526374518 |
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2000 Aug 04
34
Philips Semiconductors
Product specication
Digital TV sound demodulator/decoder
TDA9874A
7.3.14
NICAM LOWER ERROR LIMIT REGISTER (NLELR)
When the auto-mute function is enabled
(see Section 7.3.12) and the NICAM bit error count is
lower than the value contained in this register, the NICAM
signal is selected (again) for reproduction; see also
Section 7.3.15.
The default setting after Power-on reset is 0001 0100.
Table 41 NICAM lower error limit register
(subaddress 16)
7.3.15
NICAM UPPER ERROR LIMIT REGISTER (NUELR)
When the auto-mute function is enabled and the NICAM bit
error count is higher than the value contained in this
register, the signal of the first sound carrier (i.e. FM mono
or AM sound) or the analog mono input is selected for
reproduction.
The difference between the upper and lower error limit
constitutes a hysteresis to avoid frequent switching
between NICAM and the program on the 1st sound carrier.
The default setting after Power-on reset is 0101 0000.
Table 42 NICAM upper error limit register
(subaddress 17)
7.3.16
AUDIO MUTE CONTROL REGISTER (AMCONR)
Only bits 6, 2 and 1 are used. When any of these bits is set
to logic 1, the corresponding pair of output channels will be
muted. A bit set to logic 0 allows normal signal output.
The unused bits should be set to logic 1
The default setting after Power-on reset is 1111 1111.
76543210
B7
B6
B5
B4
B3
B2
B1
B0
7
6
543210
B7
B6
B5
B4
B3
B2
B1
B0
Table 43 Audio mute control register (subaddress 18)
Table 44 Description of the audio mute control register bits
76543210
1
MUTI2S
1
MUTSOUT
MUTMOUT
1
BIT
SYMBOL
DESCRIPTION
7
this bit is not used and should be set to logic 1
6
MUTI2S
Mute I2S-bus output: if bit MUTI2S = 1 the I2S-bus output is muted
5
these bits are not used and should be set to logic 1
4
3
2
MUTSOUT
Mute Stereo Output: if bit MUTSOUT = 1 the analog stereo output is muted
1
MUTMOUT
Mute Mono Output: if bit MUTMOUT = 1 the analog mono output is muted
0
this bit is not used and should be set to logic 1
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