EL2030
Video signals are 1V peak-peak in amplitude, from sync tip
to peak white. There are 100 IRE (0.714V) of picture (from
black to peak white of the transmitted signal) and 40 IRE
(0.286V) of sync in a composite video signal (140 IRE = 1V).
The following table summarizes the behavior of the EL2030
at ±5V and ±15V for NTSC. In addition, 30MHz HDTV data is
included. Refer to the differential gain and phase typical
performance curves for more data.
For video applications where a gain of two is used (double
termination), the output of the video amplifier will be a
maximum of 2V peak-peak. With ±5V power supply, the
EL2030 output swing of 3.5V is sufficient to satisfy the video
output swing requirements. The EL2030 can drive two
double terminated coax cables under these conditions. With
±15V supplies, driving four double terminated cables is
feasible.
±V
RLOAD
75Ω
A
GAIN PHASE
COMMENTS
Single terminated
Double terminated
Double terminated
Single terminated
Double terminated
Double terminated
S
V
15V
15V
5V
1
0.02%
0.02%
0.05%
0.02%
0.01%
0.03%
0.05%
0.03°
0.02°
0.02°
0.08°
0.02°
0.09°
0.02°
150Ω
150Ω
75Ω
1
1
2
2
2
2
15V
15V
5V
Although the EL2030's video characteristics (differential gain
and phase) are impressive with ±5V supplies at NTSC and
PAL frequencies, it can be optimized when the supplies are
increased to ±15V, especially at 30MHz HDTV applications.
This is primarily due to a reduction in internal parasitic
junction capacitance with increased power supply voltage.
150Ω
150Ω
150Ω
15V
HDTV, Double
terminated
Equivalent Circuit
10
INTERSIL [ Intersil ]
