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參數(shù)資料
| 型號(hào)： | TDA9870A |
| 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 |
| 封裝： | SHRINK, PLASTIC, DIP |
| 文件頁(yè)數(shù)： | 37/88頁(yè) |
| 文件大?。?/td> | 362K |
| 代理商： | TDA9870A |
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1998 Aug 10
37
Philips Semiconductors
Product specification
Digital TV Sound Processor (DTVSP)
TDA9870A
Table 24
Channel 2 receive mode (see Table 23)
Table 25
Filter bandwidth Channel 1 and Channel 2 (see Table 23)
Table 26
Identification mode (see Table 23)
10.3.7
FM
DE
-
EMPHASIS REGISTER
10.3.7.1
Description
This register is used to select the proper de-emphasis characteristics as appropriate for the standard of the received
carrier. Bits B3 to B0 apply to sound carrier 1, bits B7 to B4 apply to sound carrier 2. In the event of A2 reception, both
groups must be set to the same characteristics.
10.3.7.2
Definition
Table 27
Subaddress 10 (note 1)
Note
1.
The default setting at power-up is 00000000.
B3
B2
CHANNEL 2
0
0
1
0
1
0
FM
AM
don’t care
B4
B1
FILTER BANDWIDTH
FILTER MODES
CH1
CH2
0
0
narrow
narrow
recommended for nominal terrestrial broadcast conditions and SAT with
2 carriers
recommended only for high-deviation SAT mono carriers (e.g. obsolete
main channel on Astra)
recommended for moderately overmodulated broadcast conditions
recommended for strongly overmodulated broadcast conditions
0
1
extra wide
narrow
1
1
0
1
medium
wide
medium
wide
B7
B6
IDENT MODE
0
0
1
1
0
1
0
1
slow
medium
fast
off/reset
BIT
NAME
ADEEM2
DESCRIPTION
7 (MSB)
6
5
4
3
2
1
0 (LSB)
adaptive de-emphasis on/off
time constant selection for FM de-emphasis
ADEEM1
adaptive de-emphasis on/off
time constant selection for FM de-emphasis
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| TDA9874A | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV sound demodulator/decoder |
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