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TDA9808 Datenblatt(PDF) 10 Page - NXP Semiconductors |
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TDA9808 Datenblatt(HTML) 10 Page - NXP Semiconductors |
10 / 36 page 1999 Jun 04 10 Philips Semiconductors Product specification Single standard VIF-PLL with QSS-IF and FM-PLL demodulator 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. |
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