TDA9874A Philips Semiconductors, TDA9874A Datasheet - Page 3

• Manufacturer Part Number: TDA9874A
• Description: Digital TV sound demodulator/decoder
• Manufacturer: Philips Semiconductors

Philips Semiconductors
1
1999 Dec 03
Sound IF (SIF) input switch
SIF 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
NICAM decoding (B/G, D/K, I and L standard)
2-carrier multi-standard FM demodulation (B/G, D/K 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 system L, 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
I
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.
Digital TV sound demodulator/decoder
2
S-bus serial audio output with matrix, level adjustment
FEATURES
3
2
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
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 standard. In other application areas subsets of the
standard combinations are available 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 and is
supported by the TDA9874A. The 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 and sound
systems and their key parameters is given in
Tables 1 to 3.
The analog multi-channel systems are sometimes also
called 2CS (2-carrier systems).
GENERAL DESCRIPTION
Supported standards
Preliminary specification
TDA9874A