I am using the LTC1535 in an application right now, and if you need RS-485, it is pretty neat. It includes the hardware to drive a small transformer that will provide you with an isolated 5V floating supply too.
However, I am MUCH more impressed with the Analog Devices ADuM5241ARZ which not only has two isolated digital channels, but also the power transformer is built-in, and the whole device fits in an SO-8 package. You can get 5V at 10mA out of it. Analog calls this series "Digital Isolators" This is absolutely truly amazing. I am using one in one of my products right now. The Analog Device part is not RS-485 compatible, it is just a digital isolator (TTL in, TTL out), but with the built-in 5V power supply, you can drive any RS-485 driver. For RS-485, you will need the 4 port version of the chip (for the Tx Enable) The app note says it runs at 300 MHz. I have not checked the device with the spectrum analyzer yet, but with a 100 MHz scope, I can't see anything. They now have special versions for I2C and even a new one that provides isolated gate drive to power MOSFETs. Both devices are specified to sustain 2500VAC for one minute (UL requirement). Didier KO4BB > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Christian Vogel > Sent: Saturday, April 26, 2008 5:17 AM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] RS485/422/232 Chip > > Hi Bruce, > >> The MAXIM MAX3162E will do RS485/422 and RS232 in the one > chip , get samples from maxim.com. > >> > > These devices only implement a single RS485/RS422 > transmitter and receiver. > > > That's true for the 3160 which can be switched between two RX > and two TX of RS232 or one RX and one TX of RS485. > The 3162 does both functions simultaneously. > > I had a look at the MAX3535E recently, which has a isolated > RS485 transceiver with capacitive coupling in it, did anyone > of you use those to break ground-loops? I'm especially > interested if this kind of "capacitor-isolation barrier" adds > any significant noise to the RS485 lines, which might couple > into sensitive signals running in parallel, or if I should > just go the traditional optocoupler-route. > > Greetings from Germany, > > Chris > > > > _______________________________________________ > time-nuts mailing list -- [email protected] To unsubscribe, > go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > Internal Virus Database is out-of-date. > Checked by AVG. > Version: 7.5.519 / Virus Database: 269.22.5/1358 - Release > Date: 4/3/2008 6:36 PM > > Internal Virus Database is out-of-date. Checked by AVG. Version: 7.5.519 / Virus Database: 269.22.5/1358 - Release Date: 4/3/2008 6:36 PM _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
