TDA9818 Просмотр технического описания (PDF) - Philips Electronics
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TDA9818 Datasheet PDF : 41 Pages
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Philips Semiconductors
Single/multistandard VIF/SIF-PLL and
FM-PLL/AM demodulators
Product specification
TDA9817; TDA9818
Notes
1. Values of video and sound parameters are decreased at VP = 4.5 V.
2. This parameter is not tested during production and is only given as an application information for designing the
television receiver.
3. Loop bandwidth BL = 70 kHz (natural frequency fn = 12 kHz; damping factor d ≈ 3; calculated with sync level within
gain control range). Resonance circuit of VCO: Q0 > 50; Cext = 8.2 pF ±0.25 pF; Cint ≈ 8.5 pF (loop voltage
approximately 2.7 V).
4. Temperature coefficient of external LC circuit is equal to zero.
5. Vi(VIF)(rms) = 10 mV; ∆f = 1 MHz (VCO frequency offset related to picture carrier frequency); white picture
video modulation.
6. VIF signal for nominal video signal.
7. The leakage current of the AGC capacitor should not exceed 1 µA at B/G standard, respectively 10 nA current at
L standard. Larger currents will increase the tilt.
8. S/N is the ratio of black-to-white amplitude to the black level noise voltage (RMS value, pin CVBS). B = 5 MHz
weighted in accordance with “CCIR 567”.
9. The intermodulation figures are defined:
α1.1
=
20
log
VV-----oo-----aa---tt----41---..--41-----MM-----HH----zz-
+ 3.6
dB ; α1.1 value at 1.1 MHz referenced to black/white signal;
α3.3
=
20
log
VV-----oo-----aa---tt----43---..--43-----MM-----HH----zz-
; α3.3 value at 3.3 MHz referenced to colour carrier.
10. Measurements taken with SAW filter K3953 (sound carrier suppression: 40 dB); loop bandwidth BL = 70 kHz:
a) Modulation VSB; sound carrier off; fvideo > 0.5 MHz.
b) Sound carrier on; SIF SAW filter K9453; fvideo = 10 kHz to 10 MHz.
11. Response speed valid for a VIF input level range of 200 µV up to 70 mV.
12. To match the AFC output signal to different tuning systems a current source output is provided. The test circuit is
given in Fig.9. The AFC-steepness can be changed by the resistors at pin AFC.
13. Depending on the ratio ∆C/C0 of the LC resonant circuit of VCO (Q0 > 50; note 3; C0 = Cint + Cext).
14. Source impedance: 2.3 kΩ in parallel to 12 pF (SAW filter); fIF = 38.9 MHz.
15. Without using an SIF SAW filter the mixer can be switched to intercarrier mode by connecting pin SIF1 and/or
pin SIF2 to ground. In this mode the SIF passes the VIF SAW filter and IF intercarrier levels are depending on the
sound shelf of the VIF SAW filter. The intercarrier output signal at pin QSS can be calculated by the following formula
taking into account the video output signal at pin CVBS (Vo(CVBS)(p-p) = 1.1 V typical) as a reference:
Vo(rms) =
1.1
V(p – p) × -----1----- × 10-V-V--------ii--((--ps------cc----))--(---d---B-----)---2+----0-6------d----B------±----3-------d-B
22
where:
a) -----1----- = correction term for RMS value
22
b) V-V----ii-((-ps---cc--))- (dB) = sound-to-picture carrier ratio at VIF inputs in dB
c) 6 dB = correction term of internal circuitry
d) ±3 dB = tolerance of video output and intercarrier output amplitude Vo(rms)
2004 Jun 29
18
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