[SI-LIST] Re: Damaging LVDS inputs (with embedded termination) using LVPECLvoltage swings?
- From: Bill.Cohen@xxxxxxxxxxxxxxxx
- To: sa_jr@xxxxxxxxx
- Date: Mon, 26 Aug 2002 17:39:41 -0400
Sal,
Actually we have an LVDS receiver with a common mode range from 0 to 2.=
4V.
The PECL swing we dealt with was differential and had an input swing of=
+/-500mV. So we wouldn't conduct through the ESD protection resistors t=
o
the power supply. Our main concern was exceeding the power supply volta=
ge
on the far end.
So if the common mode range of the LVDS receiver is wide enough this ca=
n be
done. If it is a single ended signal we suggest using an external 100 o=
hm
termination resistor to terminate the 50 ohm t-line at the FE properly.=
--------------------------------------------------------------
| Bill Cohen
| Toshiba America Electronic Components, Circuit Design Group
| email: wcohen@xxxxxxxx
| office: (508) 486-1031 fax: (508) 481-8828
--------------------------------------------------------------
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Sal "Agui=F1aga" =
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<sa_jr@xxxxxxxxx> To: Roy.Leventhal@ieee=
.org, si-list@xxxxxxxxxxxxx =20
Sent by: cc: =
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si-list-bounce@fre Subject: [SI-LIST] Dam=
aging LVDS inputs (with embedded termination) =20
elists.org using LVPECL voltage swin=
gs? =20
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08/26/02 05:00 PM =
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Please respond to =
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sa_jr =
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Hello All!
Is there a risk of damaging a device if an LVPECL
voltage swing is driven into an LVDS receiver?
*** (not designed to work like this, but in case of
user error this could happen ) ***
If the voltage swing is about 750 to 1000 mV with a
offset of 2.0 Volts, will it damage the LVDS receiver?
The LVDS receiver has an embedded 100 ohm termination
resitor between the +/- pins. At the moment the
connection is point to point without AC coupling.
I would appreciate a response if some of you have come
accross this one.
Thank you.
Sal Aguinaga Jr.
Rolling Meadows, IL
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