TDA9874APS 데이터 시트보기 (PDF) - Philips Electronics
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TDA9874APS Datasheet PDF : 68 Pages
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Philips Semiconductors
Digital TV sound demodulator/decoder
Preliminary specification
TDA9874A
2.1.1 ANALOG 2-CARRIER SYSTEMS
Table 1 Frequency modulation
STANDARD
M
M
B/G
I
D/K (2)
D/K (1)
D/K (3)
SOUND
SYSTEM
mono
A2
A2
mono
A2
A2
A2
CARRIER FM DEVIATION (kHz)
FREQUENCY
(MHz)
NOM. MAX. OVER.
4.5
15
25
50
4.5/4.724
15
25
50
5.5/5.742
27
50
80
6.0
27
50
80
6.5/6.742
27
50
80
6.5/6.258
27
50
80
6.5/5.742
27
50
80
MODULATION
SC1
mono
1⁄2(L + R)
1⁄2(L + R)
mono
1⁄2(L + R)
1⁄2(L + R)
1⁄2(L + R)
SC2
−
1⁄2(L − R)
R
−
R
R
R
BANDWIDTH/
DE-EMPHASIS
(kHz/µs)
15/75
15/75 (Korea)
15/50
15/50
15/50
15/50
15/50
Table 2 Identification for A2 systems
PARAMETER
A2; A2*
Pilot frequency
54.6875 kHz = 3.5 × line frequency
Stereo identification frequency 117.5 Hz = l--i--n----e-----f--r1--e-3--q--3--u---e---n----c---y-
Dual identification frequency 274.1 Hz = l--i--n----e-----f--r--5e---7q----u---e---n----c---y-
AM modulation depth
50%
A2+ (KOREA)
55.0699 kHz = 3.5 × line frequency
149.9 Hz = l--i--n----e-----f--r1--e-0--q--5--u---e---n----c---y-
276.0 Hz = l--i--n----e-----f--r--5e---7q----u---e---n----c---y-
50%
2.1.2 2-CARRIER SYSTEMS WITH NICAM
Table 3 NICAM
STANDARD
FREQUENCY
(MHz)
TYPE
SC1
MODULATION
INDEX (%)
DEVIATION
(kHz)
SC2
(MHz)
NICAM
DE-
EMPHASIS
ROLL-
OFF (%)
NICAM
CODING
NOM. MAX. 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
note 2
L
6.5
AM 54 100
−
−
5.85
J17
40
note 1
Notes
1. See “EBU NICAM 728 specification” or equivalent specification.
2. Not yet officially defined.
1999 Dec 03
4
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