EMRFD Message Archive 1341

Message Date From Subject
1341 2008-01-17 18:43:30 joe price Elantec IC
I'm trying to find a FET buffer that was made by Elantec before
they where purchased by Intersil. The EL2004 is no longer made
and I would like to build a FET scope probe that used this device.
Anyone know of a substitute or where to obtain the EL2004?

Thanks Joe
1342 2008-01-17 20:11:17 kerrypwr Re: Elantec IC
The LH0063 is a similar device but rated to 300 MHz, not 350 as the 2004;


Futurlec have them;


Darn; just checked and they are out-of-stock. So are Digi-Key. So
are Maxim. :((

But Futurlec have the LH0033;


Only 100 MHz, though, but 1/4 of the price!
1343 2008-01-17 21:53:51 kerrypwr Re: Elantec IC
What about the OPA656?


Availably cheaply;


One of these in the probe, configured as a buffer with high input
impedance and 50-ohm output into the cable (RG-58); another one at the
'scope end of the cable with its input matched to 50 ohms and a
low-impedance output to the 'scope.

Just thinking-out-loud! :)
1344 2008-01-18 05:51:43 bkopski Re: Elantec IC
1345 2008-01-18 11:48:56 kerrypwr Re: Elantec IC
Brilliant, Bob!!

All the design work is done.

In view of the apparent unavailability of the Elantec device this
seems to meet the OP's requirements.