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EL2030CM Datasheet(PDF) 11 Page - Elantec Semiconductor |
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EL2030CM Datasheet(HTML) 11 Page - Elantec Semiconductor |
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11 / 16 page  EL2030C 120 MHz Current Feedback Amplifier Video Applications Contd Video signals are 1V peak-peak in amplitude from sync tip to peak white There are 100 IRE (0714V) of picture (from black to peak white of the transmitted signal) and 40 IRE (0286V) of sync in a composite video signal (140 IRE e 1V) For video applications where a gain of two is used (double termination) the output of the vid- eo amplifier will be a maximum of 2V peak-peak With g5V power supply the EL2030 output swing of 35V is sufficient to satisfy the video output swing requirements The EL2030 can drive two double terminated coax cables under these conditions With g15V supplies driving four double terminated cables is feasible Although the EL2030’s video characteristics (dif- ferential gain and phase) are impressive with g 5V supplies at NTSC and PAL frequencies it can be optimized when the supplies are increased to g15V especially at 30 MHz HDTV applica- tions This is primarily due to a reduction in in- ternal parasitic junction capacitance with in- creased power supply voltage The following table summarizes the behavior of the EL2030 at g5V and g15V for NTSC In ad- dition 30 MHz HDTV data is included Refer to the differential gain and phase typical perform- ance curves for more data g Vs Rload Av DGain DPhase Comments 15V 75 X 1 002% 003 Single terminated 15V 150 X 1 002% 002 Double terminated 5V 150 X 1 005% 002 Double terminated 15V 75 X 2 002% 008 Single terminated 15V 150 X 2 001% 002 Double terminated 5V 150 X 2 003% 009 Double terminated 15V 150 X 2 005% 002 HDTV Double terminated Equivalent Circuit 2030 – 18 11 |
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