The ISO124 works well - built a 32 channel isolated analog input board using them. Fairly simple, does require isolated power supples. Howard At 03:54 PM 7/19/2003 -0400, you wrote: >These might help; check out the ISO122/124 (ISO150: dual channel) >fixed-unity-gain optoisolated opamps from TI. > >Cheers, >Ishaan > >----- Original Message ----- >From: "Stef Mientki" >To: >Sent: Saturday, July 19, 2003 15:04 >Subject: Re: [EE]: analog isolation using double opto-coupler > > > > look for IL300F (linearized opto), > > it was from Siemens, Infinion, ... > > 60 dB is very well possible, even more (I believe they even stated 100 >dB). > > Texas also had such a component. > > And what about a digital isolation ? > > > > Stef Mientki > > > > Wouter van Ooijen wrote: > > > > >I want to convert a 4-20mA signal to RS-232, with isolation. My first > > >idea would be to put the isolation between the 4-20mA and the A/D, > > >using a double optocoupler (second one used to linearise the first one). > > >Do you know what accuracy can be achieved with this setup, or any links > > >to app notes? > > > > > >Wouter van Ooijen > > > > > >-- ------------------------------------------- > > >Van Ooijen Technische Informatica: www.voti.nl > > >consultancy, development, PICmicro products > > > > > >-- > > >http://www.piclist.com#nomail Going offline? Don't AutoReply us! > > >email listserv@mitvma.mit.edu with SET PICList DIGEST in the body > > > > > > > > > > > > > -- > > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > > email listserv@mitvma.mit.edu with SET PICList DIGEST in the body > >-- >http://www.piclist.com#nomail Going offline? Don't AutoReply us! >email listserv@mitvma.mit.edu with SET PICList DIGEST in the body Howard McGinnis Electronic Visions, Inc. mcginnis@e-visions.com www.e-visions.com -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu