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TDA9809

Single standard multimedia IF-PLL and FM radio demodulator

Philips Electronics 

Philips Semiconductors

Single standard multimedia IF-PLL and FM

radio demodulator

Preliminary specification

TDA9809M

14. The intercarrier output signal at pin 10 can be calculated with the following formula using the video output signal at

pin 13 (Vo(video)(p-p) = 1.1 V typical) as a reference:

Vo (rms)

=

1.1

V (p – p)

× -----1----- × 10-VV---------ii--((----SP------CC--------))-----(---d----B----)-2----+0----6-------d----B-----±---3-----d----B

22

with -----1----- = correction term for RMS value,

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VV-----ii-((-SP---CC---)) (dB) = sound-to-picture carrier ratio at VIF input (pins 1 and 2) in dB,

6 dB = correction term of internal circuitry and ±3 dB = tolerance of video output and intercarrier output amplitude

Vo(rms).

Example: SAW filter G1962 (sound shelf: 20 dB) ⇒ V-V----ii-((-SP---CC---)) = –27 dB ⇒ Vo(rms) = 32 mV (typ.) .

15. Input level for second IF from an external generator with 50 Ω source impedance. AC-coupled with 10 nF capacitor,

fmod = 1 kHz, 27 kHz (54% FM deviation) of audio reference. A VIF/SIF input signal is not permitted. Pin 5 has to be

connected to the positive supply voltage for minimum IF gain. S/N and THD measurements are taken at 50 µs (75 µs

at M standard) de-emphasis (modulator pre-emphasis has to be activated). The FM demodulator steepness

∆Vo(AF)/∆fAF is positive.

a) Second IF input level 10 mV (RMS).

16. Measured with an FM deviation of 27 kHz, the typical AF output signal is 500 mV (RMS) (Rx = 0 Ω). By using

Rx = 680 Ω 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 = 680 Ω.

17. The leakage current of the decoupling capacitor (2.2 µF) should not exceed 1 µA.

18. For all S/N measurements, the vision IF modulator used must 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).

19. The PC/SC1 ratio at pins 1 and 2 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.

20. Measurements taken with SAW filter G1962 (sound shelf: 20 dB) for vision and sound IF.

21. The RIF amplifier output (pin 10) must be connected to a multistandard application ceramic filter for

5.5, 6.0 and 10.7 MHz. This total load constitutes an impedance of 250 Ω.

22. d3 tested using two signals with frequencies of f1 = 10.5 MHz and f2 = 10.7 MHz, and with a level of Vi(4)(max)(rms) for

each signal. d3 is the ratio of the intermodulation product at 10.3 MHz to the output level of Vi(4)(max)(rms).

23. The control steepness of the radio AFC detector is dependent on the characteristic of the ceramic resonator, pin 18.

The figure given here will be obtained when applying a typical resonator of the type CDA 10.7 MC1-A (Murata).

The spread of the control steepness depends on the spread of the ceramic resonator characteristic (see Fig.11).

1998 Jan 08

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