tda9874h NXP Semiconductors, tda9874h Datasheet - Page 3

• Manufacturer Part Number: tda9874h
• Description: Digital Tv Sound Demodulator/decoder
• Manufacturer: NXP Semiconductors

Philips Semiconductors
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2
The TDA9874H 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.
2000 Jun 26
Sound IF (SIF) input switch e.g. to select between
terrestrial TV SIF and SAT SIF sources
SIF Automatic Gain Control (AGC) with 21 dB control
range
SIF 8-bit Analog-to-Digital Converter (ADC)
Differential Quadrature Phase Shift Keying (DQPSK)
demodulation for different standards, simultaneously
with 1-channel FM demodulation
Near Instantaneous Companded Audio Multiplexing
(NICAM) decoding (B/G, D/K, I and L standard)
2-carrier multi-standard FM demodulation (B/G, D/K, I
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 L standard,
simultaneously with NICAM
Monitor selection for FM/AM demodulator outputs and
FM and NICAM signals
Digital crossbar switch
I
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.
Digital TV sound demodulator/decoder
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S-bus serial audio output with matrix, level adjust and
FEATURES
GENERAL DESCRIPTION
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2.1
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 standards. 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,
which gives limited performance.
Korea has a stereo sound system similar to Europe which
is supported by the TDA9874H. Differences include
deviation, modulation contents and identification. It is
based on M standard.
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).
Supported standards
Product specification
TDA9874H