Philips Semiconductors
Digital TV Sound Processor (DTVSP)
Product specification
TDA9870A
1 FEATURES
1.1 Demodulator and decoder section
• Sound IF (SIF) input switch e.g. to select between
terrestrial TV SIF and SAT SIF sources
• SIF AGC with 24 dB control range
• SIF 8-bit Analog-to-Digital Converter (ADC)
• Two-carrier multistandard FM demodulation
(B/G, D/K and M standard)
• Decoding for three analog multi-channel systems
(A2, A2+ and A2*) and satellite sound
• Programmable identification (B/G, D/K and M standard)
and different identification times.
1.2 DSP section
• Digital crossbar switch for all digital signal sources and
destinations
• Control of volume, balance, contour, bass, treble,
pseudo stereo, spatial, bass boost and soft mute
• Plop-free volume control
• Automatic Volume Level (AVL) control
• Adaptive de-emphasis for satellite
• Programmable beeper
• Monitor selection for FM/AM DC values and signals,
with peak detection option
• I2S-bus interface for a feature extension (e.g. Dolby
surround) with matrix, level adjust and mute.
1.3 Analog audio section
• Analog crossbar switch with inputs for mono and stereo
(also applicable as SCART 3 input), SCART 1
input/output, SCART 2 input/output and line output
• User defined full-level/−3 dB scaling for SCART outputs
• Output selection of mono, stereo, dual A/B, dual A or
dual B
• 20 kHz bandwidth for SCART-to-SCART copies
• Standby mode with functionality for SCART copies
• Dual audio Digital-to-Analog Converter (DAC) from DSP
to analog crossbar switch, bandwidth of 15 kHz
• Dual audio ADC from analog inputs to DSP
• Two dual audio DACs for loudspeaker (Main) and
headphone (Auxiliary) outputs; also applicable for
L, R, C and S in the Dolby Pro Logic mode with feature
extension.
2 GENERAL DESCRIPTION
The TDA9870A is a single-chip Digital TV Sound
Processor (DTVSP) for analog multi-channel sound
systems in TV sets and satellite receivers.
2.1 Supported standards
The multistandard/multi-stereo capability of the
TDA9870A is mainly of interest in Europe, but also in
Hong Kong/Peoples Republic of China and South East
Asia. This includes B/G, D/K, I, M and L standard. In other
application areas there exists only subsets of those
standard combinations otherwise only single standards
are transmitted.
M standard is transmitted in Europe by the American
Forces Network (AFN) with European channel spacing
(7 MHz VHF, 8 MHz UHF) and monaural sound.
Korea has a stereo sound system similar to Europe and is
supported by the TDA9870A. 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 sound systems (A2, A2+
and A2*) are 2-Carrier Systems (2CS).
1999 Dec 20
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