eBay AD9850 Module Pinout

The cheap AD9850 DDS modules currently available on eBay are a great starting point for a signal generator project but are a little short on documentation.

The pinout and relationship to AD9850 pins is as follows:

 

Board Board AD9850 AD9850
Pin Label Label Pin
       
1 VCC DVDD,AVDD 6,11,18,23
2 CLK W_CLK 7
3 FQ FQ_UD 8
4 DATA D7 25
5 RST RESET 22
6 GND DGND,AGND 5,10,19,24
7 QP QOUTB 13
8 QN QOUT 14
9 SINA IOUTB 20
10 SINB IOUT 21
11 GND DGND,AGND 5,10,19,24
12 D7 D7 25
13 D6 D6 26
14 D5 D5 27
15 D4 D4 28
16 D3 D3 1
17 D2 D2 2
18 D1 D1 3
19 D0 DO 4
20 VCC DVDD,AVDD 6,11,18,23

All required pins are available to for the WB2V reference design (http://www.qsl.net/yo5ofh/projects/dds_vfo_by_n2apb/dds_vfo.htm) to be implemented.

Use the updated siggen3a source by AA0ED and AA0ZZ available from
http://www.njqrp.org/ham-pic/projects.htm and update as follows for the 125mhz reference oscillator:
 

;==== Currently set for 125 MHz Oscillator =======
ref_osc_3 equ 0x22 ; Most significant osc byte
ref_osc_2 equ 0x5C ; Next byte
ref_osc_1 equ 0x17 ; Next byte
ref_osc_0 equ 0xD0 ; Least significant byte

 

Powered by Easytagcloud v2.1

Contact Andrew Quinn

jaquinn@ihug.co.nz http://twitter.com/jaquinn