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From: "Michael A. Terrell"
Subject: Re: Which OpAmp to use?
Date: Mon, 28 Oct 2002 19:48:58 -0500
Organization: Have you seen my bench? No, really! Where is it?
X-Mailer: Mozilla 4.61 [en]C-CCK-MCD (Win95; U)
Bruce Lane wrote:
> Fellow hardware folk,
> This has probably been asked before, but... I have a frequency
> standard that puts out a 10MHz 1.9Vpeak sine wave. I want to run this
> through a decently non-noisy OpAmp to bring it up to about 4V into a
> 50 ohm load. With so many choices in OpAmps, it's difficult to pick
> the right one.
> After I get that part taken care of, I may build a few
> duplicates of the circuit with an eye towards making a small
> distribution amp.
> Thanks much.
> Boeing had nothing to do with the opinions express above. They merely
> provided the Usenet channel.
I built a one in, 32 out 10 MHz distribution amp with the old National
Semiconductor LH0002 a couple years ago. I just checked and it is now
obsolete, but should still be some on the market. It used a dual
supplies of + & - 15 volts, and worked quite well.
A brief description from the datasheet:
The LH0002 is a general purpose buffer. Its features make it ideal to
integrate with operational amplifiers inside a closed loop configuration
to increase current output. The symmetrical output portion of the
circuit also provides a low output impedance for both the positive and
negative slopes of output pulses.
The LH0002 is available in an 8-lead TO-99 can. The LH0002C is
available in an 8-lead TO-99, and a 10-pin molded dual-in-line package.
The LH0002 is specified for operation over the b55ßC to a125ßC military
temperature range. The LH0002C is specified for operation over the 0ßC
to a85ßC temperature range.
High input impedance 400 k Ohms
Low output impedance 6 Ohms
High power efficiency
Low harmonic distortion
DC to 30 MHz bandwidth
Output voltage swing that approaches supply voltage
400 mA pulsed output current
Slew rate is typically 200 V/ms
Operation from +/- 5V to +/- 20V
30 MHz buffer
High speed D/A conversion
Michael A. Terrell
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