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參數(shù)資料
| 型號： | TDA9874AH |
| 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)： | 12/68頁 |
| 文件大?。?/td> | 231K |
| 代理商： | TDA9874AH |
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1999 Dec 03
12
Philips Semiconductors
Preliminary specification
Digital TV sound demodulator/decoder
TDA9874A
6.2.4
FM (AM)
PATH
A high-pass filter suppresses DC offsets from the FM
demodulator that may occur due to carrier frequency
offsets, and supplies the FM monitor function with DC
values, e.g. for the purpose of microprocessor controlled
carrier search or fine tuning functions.
An adaptive de-emphasis is available for
Wegener-Panda 1 encoded satellite programs.
The de-emphasis stage offers a choice of settings for the
supported TV standards.
The 2-channel decoder performs the dematrixing of
1
2
(L + R), R to L and R signals of
1
2
(L + R) and
1
2
(L
R)
to L and R signals or of channel 1 and channel 2 to
L and R signals, as demanded by the different TV
standards or user preferences.
Automatic FM dematrixing is also supported.
Using the high deviation mode, only channel 1 (mono) can
be demodulated. The scaling is
6 dB compared to
2-channel decoding.
6.2.5
M
ONITOR
This function provides data words from the FM
demodulator outputs and FM and NICAM signals for
external use, such as carrier search or fine tuning.
The peak level of these signals can also be observed.
Source selection and data read-out are performed via the
I
2
C-bus.
6.2.6
D
IGITAL CROSSBAR SWITCH
The input channels are derived from the FM and NICAM
paths, while the output channels comprise I
2
S-bus and the
audio DACs to the analog crossbar switch. It should be
noted that there is no connection from the external analog
audio inputs to the digital crossbar switch.
6.2.7
D
IGITAL AUDIO OUTPUT
The digital audio output interface comprises an I
2
S-bus
output port and a system clock output. The I
2
S-bus port is
equipped with a level adjustment facility that can change
the signal level in a
±
15 dB range in 1 dB steps. Muting is
possible,too,andoutputscanbedisabledtoimproveEMC
performance.
The I
2
S-bus output matrix provides the functions for forced
mono, stereo, channel swap, channel 1 or channel 2.
Automatic selection for TV applications is possible. In this
case the microcontroller program only has to provide a
user controlled sound A or sound B selection.
6.2.8
S
TEREO CHANNEL TO THE ANALOG CROSSBAR PATH
A level adjustment function is provided with control
positions of 0, 3, 6 and 9 dB in combination with the audio
DACs. The Automatic Volume Level (AVL) function
provides a constant output level of
20 dB (FS) for input
levels between 0 and
26 dB (FS). There are some fixed
decay time constants to choose from, i.e. 2, 4 or 8 s.
Automatic selection for TV applications is possible. In this
case the microcontroller program only has to provide a
user controlled sound A or sound B selection.
6.2.9
G
ENERAL
The level adjustment functions can provide signal gain at
multiple locations. Great care has to be taken when using
gain with large input signals, e.g., due to overmodulation,
in order not to exceed the maximum possible signal swing,
which would cause severe signal distortion. The nominal
signal level of the various signal sources to the digital
crossbar switch should be 15 dB below digital full-scale,
i.e.,
15 dB (FS).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA9874AH/V2,557 | 功能描述:音頻放大器 DIGITAL STEREO DECODER VCR RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TDA9874AHB | 功能描述:音頻放大器 DIGITAL STEREO DECODER VCR RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TDA9874APS | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV sound demodulator/decoder |
| TDA9874H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV sound demodulator/decoder |
| 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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