Allison? re? - substitutes for the OPA2674.? and other important matters?
Interestingly Mouser lists? most video amps under? High speed operational amp category.? . If you go to? Video amplifiers you find it very bare.
There are now only two major manufacturers being? AD and? Texas? There are about three other minor manufacturers?
These latter have? Iout max figures of down around 110 mA typically so they are not much chop for the application.
OPA2674. - there is no substitute from? AD since the OPA can source up to 500mA? RF energy? at the output?
The nearest two channel device I can find from AD is the? AD? 8008? which has a 180 mA drive capacity. Threshold frequency might be slightly higher than Texas.
The highest? Iout I can find from an AD device is 175mA from the AD 8009. This is a single channel device.? Frequency specs are somewhat better than the? OPA2674
All three device have? Vmax of? 12 V when operated in single supply mode and generally have? a? +/-5V swing at maximum drive.
Ergo - designing in the? OPA into any bit of? RF? ?kit is fraught with danger commercially? as there is no compatible/comparable substitute. .
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I'll leave my critique of? H Granberg's best efforts in terms of what he left out and what he covered by ex Cathedra statements for another time? ?viz.? Motorola application notes.? I have a full bound set on rice paper that I managed to pick up for cheap a long time back.? Full as in Motorola said? they were the most important ones !! Not just Granberg -all sorts of other clowns, many oft them seemingly much more talented.? ?I will stick that critique nder the? ?RF Preamp header for those who may be interested.?
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Timothy Fidler