參數(shù)資料
型號(hào): TDA9810
廠商: NXP SEMICONDUCTORS
元件分類: 接收器
英文描述: Multistandard VIF-PLL with QSS-IF and AM demodulator
中文描述: AM, AUDIO/VIDEO DEMODULATOR, PDIP24
封裝: PLASTIC, SDIP-24
文件頁數(shù): 17/32頁
文件大小: 225K
代理商: TDA9810
1999 May 07
17
Philips Semiconductors
Product specification
Multistandard VIF-PLL with QSS-IF and
AM demodulator
TDA9810
15. Depending on the ratio
C/C
0
of the LC resonant circuit of VCO (Q
0
> 50; see note 3; C
0
= C
int
+ C
ext
).
16. Source impedance: 2.3 k
in parallel to 12 pF (SAW filter); f
IF
= 38.9 MHz.
17. For picture to sound carrier ratio see Table 1. The NICAM L subcarrier is 17 dB lower than the AM sound carrier and
depends on its AM modulation.
18. The V
o QSS
output (pin 10) is analysed by a test demodulator TDA9820. The S/N ratio of this IC is more than 60 dB,
related to a deviation of
±
27 kHz, in accordance with “CCIR 468-4”
19. For all S/N measurements the used vision IF modulator has to meet the following specifications:
a) Incidental phase modulation for black-to-white jump less than 0.5 degrees.
b) QSS AF performance, measured with the television-demodulator AMF2 (audio output, weighted S/N ratio) better
than 60 dB (deviation
±
27 kHz) for 6 kHz sine wave black-to-white video modulation.
c) Picture-to-sound carrier ratio; PC/SC
1
= 13 dB; (transmitter).
20. Measurements taken with SAW filter K6257 (Siemens) for vision IF (suppressed sound carrier) and K9453
(Siemens) for sound IF (suppressed picture carrier). Input level V
i(SIF)(rms)
= 10 mV, 27 kHz (54% FM deviation).
21. The PC/SC ratio at pins 1 and 2 is calculated as the addition of TV transmitter PC/SC ratio and SAW filter PC/SC
ratio. This PC/SC ratio is necessary to achieve the S/N
W
values as noted. A different PC/SC ratio will change
these values.
22. Measurements taken with SAW filter K9453 (Siemens) for AM sound IF (suppressed picture carrier).
23. The input voltage has to be V
i
> 2.8 V, or open-circuit.
Table 1
Input frequencies and carrier ratios
Table 2
Switch logic
DESCRIPTION
SYMBOL
B/G STANDARD L STANDARD
L ACCENT
STANDARD
NICAM L
UNIT
Picture carrier
Sound carrier
f
pc
f
sc1
38.9
33.4
33.158
13
20
38.9
32.4
10
33.9
40.4
10
38.9
32.4
32.05
10
27
MHz
MHz
MHz
dB
dB
f
sc2/NICAM
PC/SC
1
PC/SC
2/NICAM
Picture to sound
carrier ratio
STANDARD SWITCH
(PIN 8)
SELECTED STANDARD
VIDEO POLARITY
FM-PLL
AF-AMPLIFIER
1
2
1
2
2.8 V to V
P
1.3 to 2.3 V
0 to 0.8 V
B/G
B/G, with external VIF AGC negative
L
negative
on
on
off
on
on
off
FM
FM
AM
FM
FM
mute
positive
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