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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)： | 14/56頁 |
| 文件大?。?/td> | 254K |
| 代理商： | TDA9874H |
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1998 Apr 27
14
Philips Semiconductors
Preliminary specification
Digital TV sound demodulator/decoder
TDA9874H
6.3
Description of the analog audio section
6.3.1
A
NALOG CROSSBAR SWITCH AND ANALOG MATRIX
The TDA9874H has one external analog stereo input, one
mono input and one two-channel output port. Analog
source selector switches are employed to provide the
desired analog signal routing capability, which is done by
the analog crossbar switch section.
The basic signal routing philosophy of the TDA9874H is
that each switch handles two signal channels at the same
time, e.g. Left and Right, language A and B, directly at the
source. For an overview of the signal flow see Fig.5.
Each source selector switch is followed by an analog
matrix to perform further selection tasks, like putting a
signal from one input channel, say, language A, to both
output channels or for swapping left and right channel.
The analog matrix provides the functions given in Table 6.
All switches and matrices are controlled via the I
2
C-bus.
Table 6
Analog matrix functions
MODE
MATRIX OUTPUT
L OUTPUT
R OUTPUT
1
2
3
4
L input
R input
L input
R input
L input
L input
R input
6.3.2
E
XTERNAL AND MONO INPUTS
The external and mono inputs accept signal levels of up to
1.4 V (RMS). By adding external series resistors to
provide a suitable attenuation, the external input could be
used as a SCART input. Whenever the external or mono
input is selected, the output of the DAC is muted to
improve the crosstalk performance.
6.3.3
D
UAL AUDIO
DAC
The TDA9874H comprises a two-channel audio DAC for
feeding signals from the DSP section to the analog
crossbar switch. These DACs have a resolution of 15 bits
and employ four-fold oversampling and noise shaping.
6.3.4
A
UDIO OUTPUT BUFFERS
The output buffers provide 0 dB of gain and offer a muting
possibility. The post filter capacitors of the audio DACs are
connected to the buffer outputs.
6.3.5
S
TANDBY MODE
The Standby mode (see Section 7.3.2) disables most
functions and reduces power dissipation of the
TDA9874H, but provides no other functionality.
Internal registers may lose their information in Standby
mode. Therefore, the device needs to be initialized on
returning to normal operation. This can be accomplished in
the same way as after a power-on reset.
Fig.4 Switch diagram for the audio section.
handbook, full pagewidth
MGK754
OUTR
source select
matrix
mono (AM)
EXTIL
EXTIR
DACL
DACR
OUTL
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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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