TDA9874AHB View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
MFG CO.
'TDA9874AHB' PDF : 69 Pages View PDF
Philips Semiconductors
Digital TV sound demodulator/decoder
Product specification
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).
2000 Aug 04
3
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