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參數資料
| 型號： | 935263704518 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO DEMODULATOR, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁數： | 23/71頁 |
| 文件大小： | 304K |
| 代理商： | 935263704518 |
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2000 Aug 04
3
Philips Semiconductors
Product specication
Digital TV sound demodulator/decoder
TDA9874A
1
FEATURES
Sound IF (SIF) input switch
SIF Automatic Gain Control (AGC) with 24 dB control
range
Switchable 10 dB SIF input attenuator
SIF 8-bit Analog-to-Digital Converter (ADC)
Easy TV standard programming option
Differential Quadrature Phase Shift Keying (DQPSK)
demodulation for different standards, simultaneously
with 1-channel FM demodulation
Near Instantaneous Companded Audio Multiplex
(NICAM) decoding (B/G, D/K, I and L standard)
2-carrier multi-standard FM demodulation (B/G, D/K,
I and M standard)
Single carrier high deviation FM mono demodulation
mode
Decoding for three analog multi-channel systems (A2)
and satellite sound
Adaptive de-emphasis for satellite
Programmable identification (B/G, D/K and M standard)
and different identification times
FM pilot carrier presence detector
Optional AM demodulation for L standard,
simultaneously with NICAM
Monitor selection for FM/AM demodulator outputs and
FM and NICAM signals with peak option
Automatic FM dematrixing option
Digital crossbar switch
I2S-bus 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
Automatic Volume Level (AVL) control
Analog crossbar switch with inputs for mono and stereo
Output selection of mono, stereo, dual, dual A or dual B
Additional mono output with automatic select
20 kHz bandwidth for analog path
Standby mode
Automatic output selection for TV applications.
2
GENERAL DESCRIPTION
The TDA9874A is a single-chip Digital TV Sound
Demodulator/Decoder (DTVSD) 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
TDA9874A is of interest in Europe, Hong Kong/PR China
and South East Asia. This includes B/G, D/K, I, M and
L standards. In other application areas there exist subsets
of the standard combinations or only single standards are
transmitted.
All A2 (analog 2-carrier) and NICAM systems are
supported. M standard (with mono or BTSC stereo sound)
can be received and processed in mono sound mode.
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 TDA9874A. A second
possibility is to use the internal AM demodulator stage
(with 6.5 MHz intercarrier), which gives limited
performance.
Korea has a stereo sound system similar to Europe which
is supported by the TDA9874A. Differences include
deviation, modulation contents and identification. It is
based on M standard.
For all FM standards a high deviation mode for a single
carrier monaural sound demodulation is selectable.
An overview of the supported standards, sound systems
and their key parameters is given in Tables 1 to 3.
The analog multi-channel systems are sometimes also
referred to as 2-carrier systems (2CS).
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