[time-nuts] Replacement High-Speed AOP for Distribution Amplifier

[Samuel D. [x86/CPC]]

The slew rate seems a bit slow on AD8047 (750 V/µs VS 1100 V/µs). A great
(but expensive) AOP with really nice specs is the LT1227 from Linear. But
I'm not a time guru and perhaps there is some tricks that I'm not aware of.
For a distribution amplifier designed to share an accurate 10 MHz sine wave
(and perhaps a 5 Mhz square wave), what are the most important specs to look
at ?


-----Message d'origine-----
De : time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] De la
part de Yuri Ostry
Envoyé : lundi 6 avril 2009 17:29
À : Discussion of precise time and frequency measurement
Objet : Re: [time-nuts] Replacement High-Speed AOP for Distribution
Amplifier

Hello,

Monday, April 6, 2009, 17:59:49, Samuel D. wrote:

S> Hi there,

S> I'm working on a new GPS-Disciplined Rubidium Frequency Standard and I'm
now
S> designing the distribution amplifier stage. There is many schematics
S> everywhere on the Internet, the most famous is the TADD-1 reviewed by the
S> not-less-famous TVB. Almost all of them use high-speed Op Amps originally
S> designed for video processing. The most common AOP are the MAX477 (used
in
S> TADD-1) and the MAX4135. Unfortunately, both of them are now obsolete and
S> will be discontinued soon. I checked Digikey and Farnell, but those parts
S> are not available anymore, so, I'm looking for an equivalent (or better!)
S> replacement. 

S> Any hints ?

Check current Analog Devices opamps offers. There is some pin to pin
replacement for MAX477. If memory serves me corectly, it is AD8047 (I
may be wrong, though, check datasheets).




-- 
Best regards,
 Yuri                          mailto:yuri at ostry.ru


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