75MHz crystal for SX28. How to connect ?

warner

I am looking for information on running a SX28 at 75 MIPS. What crystal would I use and dose it need capacitors like the PIC Chips or can they be connected to ground like the 50 MHz resonator parallax?

Post Edited By Moderator (Bean (Hitt Consulting)) : 4/8/2007 12:49:10 PM GMT

Forrest

Here's some info from tje SX28 page - see the link at the bottom www.parallax.com/detail.asp?product_id=SX28AC/DP-G

Phil Pilgrim (PhiPi)

In my experience, an external oscillator is necessary for operation at 75MHz. A crystal or resonator won't do the job. Parallax offers such an oscillator; or, if space is an issue, you can get a surface-mount oscillator from DigiKey.

At this frequency, the SX dissipates a lot of heat. So you will want to consider heatsinking it too — especially if it's installed in an unvented enclosure.

-Phil

Post Edited (Phil Pilgrim (PhiPi)) : 4/8/2007 5:10:43 PM GMT

Capt. Quirk

Here is more info, including a wire diagram

Capt. Quirk

Just curious, have you tried SX-Sim yet?

Phil Pilgrim (PhiPi)

Yes, do read the Parallax appnote. The skull and crossbones is a little over the top, though, so don't be intimidated by it. With care, the SX can safely run at 75MHz. I have a customer whose 75MHz SX system has run continuously for several years without a problem.

Good luck with your project!

-Phil

warner

Would the Code remain the same for a SX0001 ? For a 50 meg ceramic oscillator I am using

DEVICE SX28, OSCHS2, TURBO, STACKX, OPTIONX

would this work for a 75 MHz SX0001 ?