Philips Semiconductors
Product specification
Multistandard vision and sound-IF PLL with
DVB-IF processing
TDA9819
13. The intermodulation figures are defined:
V0at 3.58 MHz
α0.92 = 20 log
+ 3.6dB ; α0.92 value at 0.92 MHz referenced to black/white signal;
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V0at 0.92 MHz
V0at 3.58 MHz
α2.76 = 20 log
; α2.76 value at 2.76 MHz referenced to colour carrier.
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V0at 2.76 MHz
14. Sound carrier ON; SIF SAW filter L9453; fvideo = 10 kHz to 10 MHz.
15. Response speed valid for a VIF input level range of 200 µV up to 70 mV.
16. To match the AFC output signal to different tuning systems a current source output is provided. The test circuit is
given in Fig.7. The AFC-steepness can be changed by the resistors at pin 23.
17. Depending on the ratio ∆C/C0 of the LC resonant circuit of VCO (Q0 > 50; C0 = Cint + Cext; see Fig.12).
18. The intercarrier mode can be activated by connecting the SIF input pins 31 and 32 to GND (only for negative
modulation B/G and M standard). In this event the intercarrier level depends on the sound shelf of VIF SAW filter and
the transmitter PC/SC ratio.
19. Input level for second IF from an external generator with 50 Ω source impedance. AC-coupled with 10 nF capacitor,
fmod = 400 Hz, 25 kHz (50% FM deviation) of audio references. A VIF/SIF input signal is not permitted. Pins 8 and 28
have to be connected to positive supply voltage for minimum IF gain. S/N and THD measurements are taken at 75 µs
de-emphasis. The FM demodulator steepness ∆Vo AF/∆fAF is negative.
20. Measured with an FM deviation of 25 kHz the typical AF output signal is 500 mV RMS (Rx = 0 Ω; see Fig.12). By
using Rx = 470 Ω the AF output signal is attenuated by 6 dB (250 mV RMS). For handling an FM 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 Ω.
21. The leakage current of the decoupling capacitor (2.2 µF) should not exceed 1 µA.
22. For all S/N measurements the used vision IF modulator has to meet the following specifications:
Incidental phase modulation for black-to-white jump less than 0.5 degrees;
QSS AF performance, measured with the television-demodulator AMF2 (audio output, weighted S/N ratio) better
than 60 dB (deviation 25 kHz) for 6 kHz sine wave black-to-white video modulation.
23. 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.
24. Measurements for M standard with SAW filter M3951M (Siemens) for vision IF (suppressed sound carrier) and
M9352M (Siemens) for sound IF (suppressed picture carrier). Input level Vi SIF = 10 mV RMS, 25 kHz FM deviation.
Measurements for B/G standard with SAW filter G3962 (Siemens) for vision IF (suppressed sound carrier) and
G9350 (Siemens) for sound IF (suppressed picture carrier). Input level Vi SIF = 10 mV RMS, 27 kHz
(54% FM deviation).
25. Measurements taken with SAW filter L9453 (Siemens) for AM sound IF (suppressed picture carrier).
1998 Jul 14
19
NXP [ NXP ]
