[ARC5] 9850 DDS

[Howie DeFelice]

Dave,

What a great find. There was an article in this months QEX that explains using this very chip.  There are a few ways to get the freq info into the chip. A few are:

1. use the parallel port of a PC with a few protection diodes and resistors along with a program to spit the correct data out the port.

2. load the data into a small prom, eprom, etc. and use a counter to load the data words in

3. program a PIC or AVR to load the data words. This would probably be the easiest to do. You could use a PICAXE chip which comes with a BASIC interpreter built in. The only thing required is a PC with a serial port. Use could also use one of many versions of the Atmel AVR along with a free compiled basic from MCS Electronics. All you need is a PC with a parallel port to program the chip. I have used both of these with great success. The nice thing about the Atmel AVR/MCS software approach is that the parts are dirt cheap and available everywhere( Digikey, Mouser).  The PICAXE is available from Sparkfun. Both versions of BASIC are very easy to use and have many built in functions that make programming easy. I am NOT a programmer or do I pretend to be one but even I can say that these devices are easy to use.


Howie AB2S