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TDA9808

Single standard VIF-PLL with QSS-IF and FM-PLL demodulator

Philips Electronics 

Philips Semiconductors

Single standard VIF-PLL with QSS-IF and

FM-PLL demodulator

Product specification

TDA9808

Notes to the characteristics

1. Values of video and sound parameters are decreased at VP = 4.5 V.

2. 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: see Table 3; Cint ≈ 8.5 pF (loop voltage approximately

2.7 V).

3. Vi(VIF) signal for nominal video signal.

4. S/N is the ratio of black to white amplitude to the black level noise voltage (RMS value, pin 9). B = 5 MHz weighted

in accordance with “CCIR 567” at a source impedance of 50 Ω.

5. To match the AFC output signal to different tuning systems a current source output is provided (Fig.10).

6. Depending on the ratio ∆C/C0 of the LC resonant circuit of VCO (Q0 > 50; see note 2; C0 = Cint + Cext).

7. Temperature coefficient of external LC-circuit is equal to zero.

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

fmod = 1 kHz, 25 kHz (50% FM deviation) of audio reference. A VIF/SIF input signal is not permitted. Pin 17 has to be

connected to positive supply voltage. S/N and THD measurements are taken at 50 µs (75 µs at M standard)

de-emphasis.

1999 Jun 04

10

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