TA0310 Datasheet, PDF (12/14 Pages) STMicroelectronics – High Speed Operational Amplifiers for 75Ω Video Lines

TA0310
Notes on video line driving
Figure 15: STm5588 (DVD chip). Fs=54MHz for PV outputs. 12MHz LPF to limit the 54MHz
Amplitude
1Vp-p
Filtering ^{Parasitic frequency due}
to sampling of the DAC
12MHz
54MHz ^Frequency
(STm5588)
42MHz
Figure 16: Fs=74.25MHz for HD outputs. 30MHz LPF to limit the 74.25MHz
Amplitude
1Vp-p
Filtering
Parasitic frequency due
to sampling of the DAC
30MHz
44.25MHz
74.25MHz ^Frequency
(STi7710)
Notes concerning the video input stage
Behavior on capacitive load
As explained in Section 3 on page 1, a high speed op-amp can be used for matching the video signal to
the input stage of a TV or set-top-box. The input of a chip-set (typically the input of an analog to digital
converter) is mainly a pure resistor approximately 1kΩ or 2kΩ in parallel with a capacitor of some of 10pF.
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