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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)： | 11/56頁 |
| 文件大小： | 254K |
| 代理商： | TDA9874H |
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1998 Apr 27
11
Philips Semiconductors
Preliminary specification
Digital TV sound demodulator/decoder
TDA9874H
6.1.9
NICAM
AUTO
-
MUTE
This function is enabled by setting bit AMUTE LOW
(see Section 7.3.11). Upper and lower error limits may be
defined by writing appropriate values to two registers in the
I
2
C-bus section (see Sections 7.3.13 and 7.3.14). When
the number of errors in a 128 ms period exceeds the upper
error limit, the auto-mute function will switch the output
sound from NICAM to whatever sound is on the first sound
carrier (FM or AM) or to the analog mono input. When the
error count is smaller than the lower error limit, the NICAM
sound is restored.
The auto-mute function can be disabled by setting bit
AMUTE HIGH. In this case clicks become audible, when
the error count increases. The user will hear a signal of
degrading quality.
A decision to enable/disable the auto-muting is taken by
the microprocessor based on an interpretation of the
application control bits C1, C2, C3 and C4, and possibly
any additional strategy implemented by the setmaker in
the microcontroller software.
When the AM sound in NICAM L systems is demodulated
in the 1st sound IF and the audio signal connected to the
mono input of the TDA9874H, the controlling
microprocessor has to take care of switching from NICAM
reception to mono input, if auto-muting is desired. This
could be achieved by setting the AMSEL bit HIGH
additionally to AMUTE bit LOW (see also Section 7.3.11).
6.1.10
C
RYSTAL OSCILLATOR
A circuit diagram of the external components of the
voltage-controlled crystal oscillator is shown in Fig.7 in
Chapter 9.
6.1.11
T
EST PINS
All test pins are active HIGH. In normal operation of the
device they can be left open-circuit, as they have internal
pull-down resistors. Test functions are for manufacturing
tests only and are not available to customers.
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相關(guān)代理商/技術(shù)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(guān)文件:STA321 View All Specifications 標準包裝: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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