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參數(shù)資料
| 型號： | TDA9875 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | Digital TV Sound Processor DTVSP |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP64 |
| 文件頁數(shù)： | 17/92頁 |
| 文件大?。?/td> | 279K |
| 代理商： | TDA9875 |
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1998 Feb 13
17
Philips Semiconductors
Preliminary specification
Digital TV Sound Processor (DTVSP)
TDA9875
6.3.1
A
NALOG CROSSBAR SWITCH AND ANALOG MATRIX
(see also Fig.6)
There are a number of analog input and output ports with
the TDA9875. Analog source selector switches are
employed to provide the desired analog signal routing
capability. The analog signal routing is performed by the
analog crossbar switch section. A dual audio ADC
provides the connection to the DSP section and a dual
audio DAC provides the connection from the DSP section
to the analog crossbar switch. The digital signal routing is
performed by a digital crossbar switch.
The basic signal routing philosophy of the TDA9875 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.
Each source selector switch is followed by an analog
matrix to perform further selection tasks, such as putting a
signal from one input channel, say language A, to both
output channels or for swapping left and right channels.
The analog matrix provides the functions given in Table 6
(see also Fig.5).
Table 6
Analog matrix functions
All switches and matrices are controlled via the I
2
C-bus.
There is one restriction for switching signals at inputs and
outputs for SCART 1 and SCART 2. At these ports, an
input signal cannot be copied to its own output, i.e. it is not
possible to make a copy from SCART 1 input to SCART 1
output.
MODE
MATRIX OUTPUT
LEFT OUTPUT
RIGHT OUTPUT
1
2
3
4
left input
right input
left input
right input
right input
left input
left input
right input
Fig.5 Analog matrix.
handbook, halfpage
MGK110
ANALOG
MATRIX
right input
left output
right output
6.3.2
SCART
INPUTS
The SCART specification allows for a signal level of up to
2 V (RMS). Because of signal handling limitations, due to
the 5 V supply voltage of the TDA9875, it is necessary to
have fixed 3 dB attenuators at the SCART inputs to obtain
a 2 V input. This results in a
3 dB SCART-to-SCART
copy gain. If 0 dB copy gain is preferred (with maximum
1.4 V input), there are +3 dB/0 dB amplifiers at the outputs
of SCART 1 and SCART 2 and at the line output.
The input attenuator is realized by an external series
resistor in combination with the input impedance, both of
which form a voltage divider. With this voltage divider the
maximum SCART signal level of 2 V (RMS) is scaled
down to 1.4 V (RMS) at the input pin. If it is known for
certain applications that the input signal level is always
below 1.4 V (RMS), the SCART inputs can be used
without external resistors.
6.3.3
E
XTERNAL AND MONO INPUTS
The 3 dB input attenuators are not required for the external
and mono inputs, because those signal levels are under
control of the TV designer. The maximum allowed input
level is 1.4 V (RMS). By adding external series resistors,
the external inputs can be used as an additional SCART
input.
6.3.4
SCART
OUTPUTS
The SCART outputs employ amplifiers with two gain
settings. The gain can be set to +3 dB or to 0 dB via the
I
2
C-bus. The +3 dB position is needed to compensate for
the 3 dB attenuation at the SCART inputs should
SCART-to-SCART copies with 0 dB gain be preferred
[under the condition of 1.4 V (RMS) maximum input level].
The 0 dB position is needed, for example, for an
external-to-SCART copy with 0 dB gain.
6.3.5
L
INE OUTPUT
The line output can provide an unprocessed copy of the
audio signal in the loudspeaker channels. This can be
either an external signal that comes from the dual audio
ADC, or a signal from an internal digital audio source that
comes from the dual audio DAC. The line output employs
amplifiers with two gain settings. The +3 dB position is
needed to compensate for the attenuation at the
SCART inputs, while the 0 dB position is needed, for
example, for non-attenuated external or internal digital
signals (see Section 6.3.4).
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| TDA9880T | 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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