參數(shù)資料
型號： TDA9818T/V1,118
廠商： NXP SEMICONDUCTORS
元件分類： 接收器
英文描述： AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24
封裝： 7.50 MM, PLASTIC, SOT-137-1, MS-013, SOP-24
文件頁數(shù)： 11/41頁
文件大?。?/td> 240K
代理商： TDA9818T/V1,118
2004 Jun 29
19
Philips Semiconductors
Product specication
Single/multistandard VIF/SIF-PLL and
FM-PLL/AM demodulators
TDA9817; TDA9818
e) Example for SAW filter G1962: sound shelf value = 20 dB,
16. Input level for second IF from an external generator with 50
source impedance. AC-coupled with 10 nF capacitor,
fmod = 1 kHz, 27 kHz (54% FM deviation) of audio references. A VIF/SIF input signal is not permitted. Pins CVAGC
and CSAGC have to be connected to positive supply voltage for minimum IF gain. S/N and THD measurements are
taken at 50
s de-emphasis at pin Vde-em (modulator pre-emphasis has to be activated). The FM demodulator
steepness
Vo(AF)/fAF is positive.
a) Second IF input level 10 mV (RMS value).
17. Measured with an FM deviation of 27 kHz the typical AF output signal is 500 mV (RMS) (Rx =0 ). By using
Rx = 470 the AF output signal is attenuated by 6 dB [250 mV (RMS)]. For handling a frequency deviation of more
than 53 kHz the AF output signal has to be reduced by using Rx in order to avoid clipping (THD < 1.5%). For an
FM deviation up to 100 kHz an attenuation of 6 dB is recommended with Rx = 470 .
18. The leakage current of the decoupling capacitor (2.2
F) should not exceed 1 A.
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/sc1 = 13 dB (transmitter).
20. The pc/sc1 ratio is calculated as the addition of TV transmitter pc/sc1 ratio and SAW filter pc/sc1 ratio. This pc/sc1
ratio is necessary to achieve the S/NW values as noted. A different pc/sc1 ratio will change these values.
21. Measurements taken with SAW filter K3953 for vision IF (suppressed sound carrier) and K9453 for sound IF
(suppressed picture carrier). Input level Vi(SIF)(rms) = 10 mV, 27 kHz (54% FM deviation).
22. Measurements taken with SAW filter G1962 (sound shelf: 20 dB) for vision and sound IF. Pin SIF1 and/or pin SIF2
has to be connected to ground for switching the single reference QSS mixer to intercarrier mode.
23. Measurements taken with SAW filter K9453 (Siemens) for AM sound IF (suppressed picture carrier).
Table 1
Input frequencies and carrier ratios
DESCRIPTION
SYMBOL
B/G STANDARD
M/N STANDARD
L STANDARD
L ACCENT
STANDARD
UNIT
picture or IF carrier
fpc or fIF
38.9
45.75/58.75
38.9
33.9
MHz
sound carrier
fsc1
33.4
41.25/54.25
32.4
40.4
MHz
fsc2
33.158
MHz
picture-to-sound carrier
sc1
13
7
10
dB
sc2
20
dB
V
i(sc)
V
i(pc)
-------------
27 dB
–
V
o(rms)
32 mV (typical value)
=
=
相關(guān)PDF資料
PDF描述
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TDA9819 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multistandard vision and sound-IF PLL with DVB-IF processing
TDA9819T 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multistandard vision and sound-IF PLL with DVB-IF processing
TDA9820 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multistandard/dual channel TV FM intercarrier sound demodulator
TDA9820T 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multistandard/dual channel TV FM intercarrier sound demodulator
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