DDS-VFO Project
Project Overview
Hardware
Software
Software Down Load
Reference
Updated on
March 26th, 2001
VFO Project ----- Overview
DDS ----- Basic Information
What is DDS and VFO?
DDS is an abbreviation of Direct Digital Synthesizer
VFO is Variable Frequency Oscilator
Function
I made a VFO using DDS chip controlled by PIC16F84 MPU. The VFO has two
operating mode, one is PC mode and another is Independent mode. You can
see at here.
Specification of the VFO is here.
BlocK Diagram
VFO Project ----- Hardware
Circuit diagram
--- DDS part (Large size) (Small size)
--- PIC part (Large side) (Small size)
VFO Project ----- Software
PC control panel
----- State transition
----- Frequency sweep types
Control program (PIC side)
----- Control flow
VFO Project ----- Software Down Load
Control program for PIC side
------- SCI_DDS_V1_PIC.EXE( 61kB)
Control program for PC side(VB5 basis)
------- SCI_DDS_V1_VB5_EXE.EXE(41kB)
VFO Project ---- Reference
Related web sites
DDS chip
--- AD9851(AD9850)
http://www.analog.com/
http://www.analog.com/en/prod/0,,770_843_AD9851%2C00.html
http://products.analog.com/products/info.asp?product=AD9851
--- HSP45102
http://www.semi.harris.com/
http://www.intersil.com/design/parametric/productinfo.asp?pn=HSP45102PC-33
http://www.intersil.com/products/deviceinfo.asp?pn=HSP45102
Related documents
--- AD9851(AD9850)
Building a Direct Digital Synthesis VFO By Curtis W.Preuss,
WB2V QEX July 1997
(You can get PIC program made by WB2V. Please go to ARRL web site ( http://www.arrl.org/files/qex/ ) then find get "DDS_VFO.ZIP".)
--- HSP45012
Build Your Own Network Analyzer -- Part 1
By Steven C.Hageman QST January 1998 page39
Build Your Own Network Analyzer -- Part 2
By Steven C.Hageman QST February 1998 page35
(You can get a program. Please go to ARRL web site ( http://www.arrl.org/files/qst/ ) then find get "hageman.zip".)