> Zilog makes good modem circuits that they build into some of their

microcontrollers. Maybe they have some stand alone versions for testing
purposes or as addons with low pin counts.  Zilog design center Austin TX
phone number is 512 707-7751.  Mr. Suresh Cheemalavagu is a good person to ask.

John Griessen
Austin TX


> For ease of use and good performance, it's best to use real modem
> chips.  Some of them are even good enough to automatically compensate
> for group delay distortion.
>
> Only the absolute lowest cost designs should use Manchester, or FSK,
> over a phone line. It will work, but it's easier and fairly cheap to use
> real modem chips. One popular one was from TI - I think it was only a 1200
> baud chip, but it was easy to interface to and cheap.  I've heard that it
> may not be available any more - I can't remember the part number.
>
> Does anyone know of some inexpensive modem chips?  Please give us
> some part numbers.
>
> Eric Engler