Hi there,
I am working with the AD9851 DDS chip from Analog...
As I understand it I need to attenuate the signal just above the frequency I enter (best option). Given I am using an AD9851 with internal clock set to 180MHz I am running the DDS at 60MHz.
I have two broad questions....
1. If I choose a frequency say 100kHz where is the first harmonic and why do I have to block it out? Its been suggested I use a variable low pass filter - why?
2. Could someone run their eye over the datasheet AD9851... it says you can create squarewaves from the chip.. how do you get square waves out of the chip?
Hope someone might answer...
Thanks
Simon
I am working with the AD9851 DDS chip from Analog...
As I understand it I need to attenuate the signal just above the frequency I enter (best option). Given I am using an AD9851 with internal clock set to 180MHz I am running the DDS at 60MHz.
I have two broad questions....
1. If I choose a frequency say 100kHz where is the first harmonic and why do I have to block it out? Its been suggested I use a variable low pass filter - why?
2. Could someone run their eye over the datasheet AD9851... it says you can create squarewaves from the chip.. how do you get square waves out of the chip?
Hope someone might answer...
Thanks
Simon