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Digital TV Sound Processor (DTVSP)
INTEGRATED CIRCUITS
DATA SHEET
TDA9875
Digital TV Sound Processor
(DTVSP)
Preliminary specification
Supersedes data of 1997 Mar 20
File under Integrated Circuits, IC02
1998 Feb 13
Philips Semiconductors
Preliminary specification
Digital TV Sound Processor (DTVSP)
TDA9875
CONTENTS
1
FEATURES
1.1
Demodulator and decoder section
1.2
DSP section
1.3
Analog audio section
2
GENERAL DESCRIPTION
2.1
Supported standards
3
ORDERING INFORMATION
4
BLOCK DIAGRAM
5
PINNING
6
FUNCTIONAL DESCRIPTION
6.1
Description of the demodulator and decoder
section
6.2
Description of the DSP
6.3
Description of the analog audio section
7
LIMITING VALUES
8
THERMAL CHARACTERISTICS
9
CHARACTERISTICS
10
I
2
C-BUS CONTROL
10.1
Introduction
10.2
Power-up state
10.3
Slave receiver mode
10.4
Slave transmitter mode
10.5
Expert mode
11
I
2
S-BUS DESCRIPTION
12
EXTERNAL COMPONENTS
13
PACKAGE OUTLINE
14
SOLDERING
14.1
Introduction
14.2
Soldering by dipping or by wave
14.3
Repairing soldered joints
15
DEFINITIONS
16
LIFE SUPPORT APPLICATIONS
17
PURCHASE OF PHILIPS I
2
C COMPONENTS
1998 Feb 13
2
Philips Semiconductors
Preliminary specification
Digital TV Sound Processor (DTVSP)
TDA9875
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 21 dB control range
·
SIF 8-bit Analog-to-Digital Converter (ADC)
·
Standby mode with functionality for SCART copies
·
DQPSK demodulation for different standards,
simultaneously with 1-channel FM demodulation
·
Dual audio digital-to-analog converter from
DSP to analog crossbar switch, bandwidth 15 kHz
·
NICAM decoding (B/G, I and L standard)
·
Dual audio ADC from analog inputs to DSP
·
Two-carrier multistandard FM demodulation (B/G, D/K
and M standard)
·
Two dual audio Digital-to-Analog Converters (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.
·
Decoding for three analog multi-channel systems (A2,
A2+ and A2*) and satellite sound
·
Optional AM demodulation for system L, simultaneously
with NICAM
2 GENERAL DESCRIPTION
The TDA9875 is a single-chip Digital TV Sound Processor
(DTVSP) for analog and digital multi-channel sound
systems in TV sets and satellite receivers.
·
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
2.1
Supported standards
The multistandard/multi-stereo capability of the TDA9875
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.
·
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
surround) with matrix, level adjust and mute.
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 TDA9875. A second
possibility is to use the internal AM demodulator stage,
however this gives limited performance.
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
Korea has a stereo sound system similar to Europe and is
supported by the TDA9875. Differences include deviation,
modulation contents and identification. It is based on
M standard.
·
User defined full-level/
-
3 dB scaling for SCART outputs
·
Output selection of mono, stereo, dual A/B, dual A or
dual B
An overview of the supported standards and sound
systems and their key parameters is given in Table 1.
·
20 kHz bandwidth for SCART-to-SCART copies
1998 Feb 13
3
Philips Semiconductors
Preliminary specification
Digital TV Sound Processor (DTVSP)
TDA9875
2.1.1
A
NALOG
2-
CARRIER SYSTEMS
Table 1
Frequency modulation
SOUND
SYSTEM
CARRIER
FREQUENCY
(MHz)
FM DEVIATION
(kHz)
NOM./MAX./OVER
MODULATION
BANDWIDTH/
DE-EMPHASIS
(kHz/
m
s)
STANDARD
SC1
SC2
M
mono
4.5
15/25/50
mono
-
15/75
M
A2+
4.5/4.724
15/25/50
1
¤
2
(L + R)
1
¤
2
(L
-
R)
15/75 (Korea)
B/G
A2
5.5/5.742
27/50/80
1
¤
2
(L + R)
R
15/50
I
mono
6.0
27/50/80
mono
-
15/50
D/K
A2
6.5/6.742
27/50/80
1
¤
2
(L + R)
R
15/50
D/K
A2*
6.5/6.26
27/50/80
1
¤
2
(L + R)
R
15/50
Table 2
Identification for A2 systems
PARAMETER
A2/A2*
A2+ (KOREA)
Pilot frequency
54.6875 kHz = 3.5
´
line frequency
55.0699 kHz = 3.5
´
line frequency
Stereo identification
frequency
117.5 Hz
=
pilot frequency
133
149.9 Hz
=
pilot frequency
105
Dual identification frequency
274.1 Hz
=
pilot frequency
57
276.0 Hz
=
pilot frequency
57
AM modulation depth
50%
50%
2.1.2
2-
CARRIER SYSTEMS WITH
NICAM
Table 3
NICAM
SC1
MODULATION
SC2
(MHz)
NICAM
ROLL-OFF
(%)
NICAM
CODING
STANDARD
FREQUENCY
(MHz)
DEVIATION
(kHz)
NOM./MAX.
DE-EMPHASIS
TYPE
INDEX (%)
NOM/MAX.
B/G
5.5
FM
-
27/50
5.85
J17
40
note 1
I
6.0
FM
-
27/50
6.552
J17
100
note 1
D/K
6.5
FM
-
27/50
5.85
J17
40
not yet
defined
L
6.5
AM
54/100
-
5.85
J17
40
note 1
Note
1. See “EBU specification” or equivalent specification.
1998 Feb 13
4
---------------------------------------
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---------------------------------------
Philips Semiconductors
Preliminary specification
Digital TV Sound Processor (DTVSP)
TDA9875
2.1.3
S
ATELLITE SYSTEMS
An important specification for satellite TV reception is the “Astra specification”. The TDA9875 is suited for the reception
of Astra and other satellite signals.
Table 4
FM satellite sound
CARRIER TYPE
CARRIER
FREQUENCY
(MHz)
MODULATION
INDEX
MAXIMUM
FM DEVIATION
(kHz)
MODULATION
BANDWIDTH/
DE-EMPHASIS
(kHz/
m
s)
Main
6.50
(1)
0.26
85
mono
15/50
(1)
Sub
7.02/7.20
0.15
50
m/st/d
(2)
15/adaptive
(3)
Sub
7.38/7.56
0.15
50
m/st/d
(2)
15/adaptive
(3)
Sub
7.74/7.92
0.15
50
m/st/d
(2)
15/adaptive
(3)
Sub
8.10/8.28
0.15
50
m/st/d
(2)
15/adaptive
(3)
Notes
1. For other satellite systems, frequencies of, for example, 5.80, 6.60 or 6.65 MHz can also be received. A de-emphasis
of 60
m
s, or in accordance with J17, is available.
2. m/st/d = mono or stereo or dual language sound.
3. Adaptive de-emphasis = compatible to transmitter specification.
3 ORDERING INFORMATION
PACKAGE
TYPE NUMBER
NAME
DESCRIPTION
VERSION
TDA9875
SDIP64
plastic shrink dual in-line package; 64 leads (750 mil)
SOT274-1
1998 Feb 13
5
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