Re: 50 ohm output ideas
- From: John Fields <jfields@xxxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 05 Oct 2005 11:36:50 -0500
On Wed, 05 Oct 2005 15:39:31 GMT, Dave Boland
<NODARNSPAMdboland9@xxxxxxxxxxx> wrote:
>I designed a circuit that produces some low frequency (.1 Hz
>to 100 KHz) square wave outputs in the TTL range (Voh =>
>2.4, Vol <= 0.8) using a 74LVC244. A customer called and
>asked if it will drive a 50 ohm load like a signal
>generator. The '244 won't do this job well, so my question
>is the best way to proceed? The options are another driver
>chip, op-amp, or discrete transistors. Anyone been through
>this and have some sage advice?
>
>I looked through questions similar to this, and a popular
>concept was a chip like the '244 with outputs parallel so
>the max. current is not exceeded. My concern is for
>reliability and waveform glitches.
---
Micrel makes some MOSFET drivers which would be perfect for what you
need, it seems.
http://www.micrel.com/_PDF/mic4416.pdf
seems like a likely candidate, but if not, check the rest of their
stuff.
--
John Fields
Professional Circuit Designer
.
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