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參數(shù)資料
| 型號： | TDA9874H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 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 |
| 文件頁數(shù)： | 24/56頁 |
| 文件大小： | 254K |
| 代理商： | TDA9874H |
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1998 Apr 27
24
Philips Semiconductors
Preliminary specification
Digital TV sound demodulator/decoder
TDA9874H
Changing the FM identification mode during FM reception may cause a brief flickering of bit IDSTE or IDDUA in the
Device Status Register (see Section 7.4.1).
When Channel 2 is used to receive FM sound carriers with the current application proposal (see Chapter 9), it is
recommended to set the TIMPOL bit HIGH (write subaddress 14; see Section 7.3.11) for best S/N performance.
7.3.7
FM D
E
-
EMPHASIS
R
EGISTER
(FMDR)
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.
The default setting at power-up is 10001000.
Table 26
FM De-emphasis Register (subaddress 10)
Table 27
Description of FMDR bits
Table 28
De-emphasis
Note
1.
The FM de-emphasis gain is 0 dB at 40 Hz.
7
6
5
4
3
2
1
0
ADEEM2
FMDSC23
FMDSC22
FMDSC21
ADEEM1
FMDSC13
FMDSC12
FMDSC11
BIT
SYMBOL
DESCRIPTION
7
ADEEM2
Adaptive de-emphasis on/off.
ADEEM2 = 1, activates the adaptive de-emphasis
function (for Wegener-Panda 1 encoded programs), which is required for certain
satellite FM channels. The standard FM de-emphasis must then be set to 75
μ
s.
ADEEM2 = 0, the adaptive de-emphasis is off.
FM de-emphasis.
The state of these 3 bits determine the FM de-emphasis for sound
carrier 2; see Table 28.
6
5
4
3
FMDSC23
FMDSC22
FMDSC21
ADEEM1
Adaptive de-emphasis on/off.
ADEEM1 = 1, activates the adaptive de-emphasis
function (for Wegener-Panda 1 encoded programs), which is required for certain
satellite FM channels. The standard FM de-emphasis must then be set to 75
μ
s.
ADEEM1 = 0, the adaptive de-emphasis is off.
FM de-emphasis.
The state of these 3 bits determine the FM de-emphasis for sound
carrier 1; see Table 28.
2
1
0
FMDSC13
FMDSC12
FMDSC11
FMDSC23
FMDSC22
FMDSC21
DE-EMPHASIS
(1)
FMDSC13
FMDSC12
FMDSC11
0
0
0
0
1
0
0
1
1
0
0
1
0
1
0
50
μ
s
60
μ
s
75
μ
s
J17
off
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TDA9875 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV Sound Processor DTVSP |
| TDA9875A | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV Sound Processor DTVSP |
| TDA9875AH | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV Sound Processor DTVSP |
| TDA9875AH/V2,557 | 功能描述:IC SOUND PROC DGTL TV 64QFP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻處理 系列:- 其它有關文件:STA321 View All Specifications 標準包裝:1 系列:Sound Terminal™ 類型:音頻處理器 應用:數(shù)字音頻 安裝類型:表面貼裝 封裝/外殼:64-LQFP 裸露焊盤 供應商設備封裝:64-LQFP EP（10x10） 包裝:Digi-Reel® 其它名稱:497-11050-6 |
| TDA9880 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Alignment-free multistandard vision and FM sound IF-PLL demodulator |
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