tda9817t NXP Semiconductors, tda9817t Datasheet - Page 19

• Manufacturer Part Number: tda9817t
• Description: Single/multistandard Vif/sif-pll And Fm-pll/am Demodulators
• Manufacturer: NXP Semiconductors

Philips Semiconductors
16. Input level for second IF from an external generator with 50
17. Measured with an FM deviation of 27 kHz the typical AF output signal is 500 mV (RMS) (R
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:
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
21. Measurements taken with SAW filter K3953 for vision IF (suppressed sound carrier) and K9453 for sound IF
22. Measurements taken with SAW filter G1962 (sound shelf: 20 dB) for vision and sound IF. Pin SIF1 and/or pin SIF2
23. Measurements taken with SAW filter K9453 (Siemens) for AM sound IF (suppressed picture carrier).
Table 1 Input frequencies and carrier ratios
2004 Jun 29
picture or IF carrier
sound carrier
picture-to-sound carrier
Single/multistandard VIF/SIF-PLL and
FM-PLL/AM demodulators
e) Example for SAW filter G1962: sound shelf value = 20 dB,
f
and C
taken at 50 s de-emphasis at pin V
steepness V
a) Second IF input level 10 mV (RMS value).
R
than 53 kHz the AF output signal has to be reduced by using R
FM deviation up to 100 kHz an attenuation of 6 dB is recommended with R
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
c) Picture-to-sound carrier ratio; pc/sc1 = 13 dB (transmitter).
ratio is necessary to achieve the S/N
(suppressed picture carrier). Input level V
has to be connected to ground for switching the single reference QSS mixer to intercarrier mode.
mod
x
DESCRIPTION
= 470
than 60 dB (deviation 27 kHz) for 6 kHz sine wave black-to-white video modulation
= 1 kHz, 27 kHz (54% FM deviation) of audio references. A VIF/SIF input signal is not permitted. Pins C
SAGC
V
-------------
V
i(sc)
i(pc)
have to be connected to positive supply voltage for minimum IF gain. S/N and THD measurements are
the AF output signal is attenuated by 6 dB [250 mV (RMS)]. For handling a frequency deviation of more
=
o(AF)
–
27 dB
/ f
AF
is positive.
SYMBOL
f
V
pc
o(rms)
sc1
sc2
f
f
sc1
sc2
or f
IF
=
32 mV (typical value)
de-em
B/G STANDARD
W
values as noted. A different pc/sc1 ratio will change these values.
33.158
i(SIF)(rms)
(modulator pre-emphasis has to be activated). The FM demodulator
38.9
33.4
13
20
= 10 mV, 27 kHz (54% FM deviation).
19
M/N STANDARD
45.75/58.75
41.25/54.25
source impedance. AC-coupled with 10 nF capacitor,
x
7
in order to avoid clipping (THD < 1.5%). For an
x
= 470 .
L STANDARD
38.9
32.4
TDA9817; TDA9818
10
x
= 0 ). By using
STANDARD
Product specification
L ACCENT
33.9
40.4
10
VAGC
MHz
dB
MHz
MHz
dB
UNIT