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參數(shù)資料
| 型號： | TDA9875A |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | Digital TV Sound Processor DTVSP |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP64 |
| 封裝： | SHRINK, PLASTIC, DIP |
| 文件頁數(shù)： | 3/96頁 |
| 文件大?。?/td> | 296K |
| 代理商： | TDA9875A |
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1999 Dec 20
3
Philips Semiconductors
Product specification
Digital TV Sound Processor (DTVSP)
TDA9875A
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)
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, I and L standard)
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
OptionalAM demodulationforsystem L,simultaneously
with NICAM
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
I
2
S-bus interface for a feature extension (e.g. Dolby Pro
Logic) 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 function for SCART copies
DualaudioDigital-to-AnalogConverter(DAC)fromDSP
to analog crossbar switch, bandwidth 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 TDA9875A is a single-chip Digital TV Sound
Processor (DTVSP) for analog and digital multi-channel
sound systems in TV sets and satellite receivers.
2.1
Supported standards
The multistandard/multi-stereo capability of the
TDA9875A 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
standards. In other application areas there exists only
subsets of these 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 and 8 MHz UHF) and monaural sound.
The AM sound of L/L accent standard is normally
demodulated in the first sound IF. The resulting AF signal
has to be entered into the mono audio input of the
TDA9875A. A second possibility is to use the internal
AM demodulator stage, however this gives limited
performance.
Korea has a stereo sound system similar to Europe and is
supported by the TDA9875A. The 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).
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