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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)： | 3/56頁 |
| 文件大?。?/td> | 254K |
| 代理商： | TDA9874H |
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1998 Apr 27
3
Philips Semiconductors
Preliminary specification
Digital TV sound demodulator/decoder
TDA9874H
1
FEATURES
SIF input switch e.g. to select between terrestrial TV SIF
and SAT SIF sources
SIF AGC with 21 dB control range
SIF 8-bit Analog-to-Digital Converter (ADC)
DQPSK demodulation for different standards,
simultaneously with 1-channel FM demodulation
NICAM decoding (B/G, I and L standard)
Two-carrier multi-standard FM demodulation
(B/G, D/K and M standard)
Decoding for three analog multi-channel systems
(A2, A2+ and A2*) and satellite sound
Adaptive de-emphasis for satellite
Programmable identification (B/G, D/K and M standard)
and different identification times
Optional AM demodulation for system L, simultaneously
with NICAM
Monitor selection for FM/AM demodulator outputs and
FM and NICAM signals
Digital crossbar switch
I
2
S serial audio output with matrix, level adjust and mute
Dual audio Digital-to-Analog Converter (DAC) from
digital crossbar switch to analog crossbar switch,
bandwidth 15 kHz
Analog crossbar switch with inputs for mono and stereo
Output selection of mono, stereo, dual, dual A or dual B
20 kHz bandwidth for analog path
Standby mode.
2
GENERAL DESCRIPTION
The TDA9874H is a single-chip Digital TV Sound
Demodulator/Decoder (DTVSD1) for analog and digital
multi-channel sound systems in TV/VCR sets and satellite
receivers.
2.1
Supported standards
The multi-standard/multi-stereo capability of the
TDA9874H is mainly of interest in Europe, but also in
Hong Kong/PR China and South East Asia. This includes
B/G, D/K, I, M and L standard. In other application areas
there exist subsets of those standard combinations or only
single standards are transmitted.
Standard M is transmitted in Europe by the American
Forces Network with European channel spacing
(7 MHz VHF, 8 MHz UHF) and monaural sound.
The AM sound of L/L’ standard is normally demodulated in
the 1st sound IF. The resulting AF signal has to be entered
into the mono audio input of the TDA9874H. A second
possibility is to use the internal AM demodulator stage,
giving limited performance.
Korea has a stereo sound system similar to Europe and is
supported by the TDA9874H. Differences include
deviation, modulation contents and identification. It is
based on M standard.
An overview of the supported standards and sound
systems and their key parameters is given in Table 1.
The analog multi-channel systems are sometimes also
named 2CS (2 carrier systems).
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