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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)： | 22/56頁 |
| 文件大?。?/td> | 254K |
| 代理商： | TDA9874H |
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1998 Apr 27
22
Philips Semiconductors
Preliminary specification
Digital TV sound demodulator/decoder
TDA9874H
7.3.4
C
ARRIER
1 F
REQUENCY
R
EGISTER
(C1FR)
Three bytes are required to define a 24-bit frequency control word to represent the sound carrier (i.e. mixer) frequency.
These three bytes are stored at subaddresses 3 to 5; subaddress 3 being the High byte. Execution of the command
starts only after all bytes have been received. If an error occurs, e.g. a premature STOP condition, partial data for this
function are ignored. The sound carrier frequency can be calculated in accordance with the following formula:
with:
data = 24-bit frequency control word
f
mix
= desired sound carrier frequency
f
clk
= 12.288 MHz (clock frequency of mixer)
2
24
= 16777216 (number of steps in a 24-bit word size).
Example: A 5.5 MHz sound carrier frequency will be generated by sending the following sequence of data bytes to the
TDA9874H (data = 7509333 in decimal notation or 729555 in hexadecimal notation): 01110010 10010101 01010101.
The default setting at power-up is 00000000 for all three bytes.
Table 19
Carrier 1 Frequency Register High byte (subaddress 3)
Table 20
Carrier 1 Frequency Register Middle byte (subaddress 4)
Table 21
Carrier 1 Frequency Register Low byte (subaddress 5)
7.3.5
C
ARRIER
2 F
REQUENCY
R
EGISTER
(C2FR)
The format is the same as for sound carrier 1, except subaddresses 6 to 8 are used. Subaddress 6 holds the High byte.
If the Carrier 2 Frequency Register is used, it will be for either the second FM sound carrier of a terrestrial or satellite FM
program or the NICAM sound carrier.
7.3.5.1
Note
While NICAM mode is used, the sound carrier 2 frequency should be set
±
2 kHz of the NICAM carrier frequency to
improve carrier loop settling. For a deviation of +2 kHz this results in the following settings:
Standard B/G, D/K and L:
5.850 MHz + 2 kHz = 5.852 MHz = (79EAAAH).
Standard I:
6.552 MHz + 2 kHz = 6.554 MHz = (888AAAH).
7
6
5
4
3
2
1
0
B7
B6
B5
B4
B3
B2
B1
B0
7
6
5
4
3
2
1
0
B7
B6
B5
B4
B3
B2
B1
B0
7
6
5
4
3
2
1
0
B7
B6
B5
B4
B3
B2
B1
B0
data
f
f
clk
--------
2
24
×
=
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| TDA9875 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV Sound Processor DTVSP |
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| 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(guān)文件:STA321 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:Sound Terminal™ 類型:音頻處理器 應(yīng)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(yīng)商設(shè)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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