Re: Elantec EL2142C line receiver latchup problem

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#2405

From: David L. Jones
Date: Mon, 08 Apr 2002 23:31

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"Peter H" <plowthruremovethis@bigpond.com> wrote in message news:<cefs8.32059$uR5.77097@newsfeeds.bigpond.com>...
> Your inputs may be going outside the allowable common mode range. This may
> happen if you are dc coupled to the transmitter and a long cable. Is your
> transmitter on the same power supply?
> 
> Not knowing your transmit circuit, the sample circuit is somewhat
> simplified - input bias dc currents? - make sure you have dc paths eg
> 100kohms to ground for the inputs of the el2142. Maybe also try ac couple
> your input signal/s.
> 
> I didn't have any problems with 800m of CAT5.
> 
> Peter H

Hi Peter,
The input is disconnected from the source via relays, I only have a
135ohm termination resistor across the input.
I wasn't expecting the device to play silly buggers with no input
signal, looks like I will have to look into adding some DC path
resistors.

Thanks
Dave :)

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From: dljones@ozemail.com.au (David L. Jones)
Newsgroups: sci.electronics.design,sci.electronics.components,aus.electronics
Subject: Re: Elantec EL2142C line receiver latchup problem
Date: 8 Apr 2002 16:31:26 -0700
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