kenneth scharf writes:

Was thinking of using 8051 series micro, the built in serial port will
drive the AD98xx and AD99xx dds chips. Question....how do I convert
the 5v digital io of the 8052 micro to the 1.8v levels used by the
AD995x series, or is the DDS chip 5v compatible (on input maybe...
what to do about output? especially on the bidirection serial line....)

The IO lines are 3.3volt compatible-- there is a pin for that. You can
get 8052 that run fine on 3.3 volts, or you can use resistors to divide down.
VHC logid (and others) can also translate down just fin.

73's WA2MZE

--
Steven D. Swift, , http://www.novatech-instr.com
NOVATECH INSTRUMENTS, INC. P.O. Box 55997
206.301.8986, fax 206.363.4367 Seattle, Washington 98155 USA